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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/stdlib-1.18.3.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>STDLIB</strong><br><strong>Reference Manual</strong><br><small>Version 1.18.3</small></p>
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<li title="default-1"><a href="array.html#default-1">default/1</a></li>
<li title="fix-1"><a href="array.html#fix-1">fix/1</a></li>
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<li title="strip-1"><a href="beam_lib.html#strip-1">strip/1</a></li>
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<li title="format_error-1"><a href="beam_lib.html#format_error-1">format_error/1</a></li>
<li title="crypto_key_fun-1"><a href="beam_lib.html#crypto_key_fun-1">crypto_key_fun/1</a></li>
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<li title="copy-1"><a href="binary.html#copy-1">copy/1</a></li>
<li title="copy-2"><a href="binary.html#copy-2">copy/2</a></li>
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<li title="decode_unsigned-2"><a href="binary.html#decode_unsigned-2">decode_unsigned/2</a></li>
<li title="encode_unsigned-1"><a href="binary.html#encode_unsigned-1">encode_unsigned/1</a></li>
<li title="encode_unsigned-2"><a href="binary.html#encode_unsigned-2">encode_unsigned/2</a></li>
<li title="first-1"><a href="binary.html#first-1">first/1</a></li>
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<li title="part-2"><a href="binary.html#part-2">part/2</a></li>
<li title="part-3"><a href="binary.html#part-3">part/3</a></li>
<li title="referenced_byte_size-1"><a href="binary.html#referenced_byte_size-1">referenced_byte_size/1</a></li>
<li title="replace-3"><a href="binary.html#replace-3">replace/3</a></li>
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<li title="nc-1"><a href="c.html#nc-1">nc/1</a></li>
<li title="nc-2"><a href="c.html#nc-2">nc/2</a></li>
<li title="nl-1"><a href="c.html#nl-1">nl/1</a></li>
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<li title="datetime_to_gregorian_seconds-1"><a href="calendar.html#datetime_to_gregorian_seconds-1">datetime_to_gregorian_seconds/1</a></li>
<li title="day_of_the_week-1"><a href="calendar.html#day_of_the_week-1">day_of_the_week/1</a></li>
<li title="day_of_the_week-3"><a href="calendar.html#day_of_the_week-3">day_of_the_week/3</a></li>
<li title="gregorian_days_to_date-1"><a href="calendar.html#gregorian_days_to_date-1">gregorian_days_to_date/1</a></li>
<li title="gregorian_seconds_to_datetime-1"><a href="calendar.html#gregorian_seconds_to_datetime-1">gregorian_seconds_to_datetime/1</a></li>
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<li title="iso_week_number-0"><a href="calendar.html#iso_week_number-0">iso_week_number/0</a></li>
<li title="iso_week_number-1"><a href="calendar.html#iso_week_number-1">iso_week_number/1</a></li>
<li title="last_day_of_the_month-2"><a href="calendar.html#last_day_of_the_month-2">last_day_of_the_month/2</a></li>
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<li title="local_time_to_universal_time-1"><a href="calendar.html#local_time_to_universal_time-1">local_time_to_universal_time/1</a></li>
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<li title="now_to_datetime-1"><a href="calendar.html#now_to_datetime-1">now_to_datetime/1</a></li>
<li title="seconds_to_daystime-1"><a href="calendar.html#seconds_to_daystime-1">seconds_to_daystime/1</a></li>
<li title="seconds_to_time-1"><a href="calendar.html#seconds_to_time-1">seconds_to_time/1</a></li>
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<li title="delete_object-2"><a href="dets.html#delete_object-2">delete_object/2</a></li>
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<div class="innertube">
<!-- refpage --><center><h1>dets</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">dets</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">A Disk Based Term Storage</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>The module <span class="code">dets</span> provides a term storage on file. The
stored terms, in this module called <strong>objects</strong>, are tuples
such that one element is defined to be the key. A Dets
<strong>table</strong> is a collection of objects with the key at the same
position stored on a file.</p>
<p>Dets is used by the Mnesia application, and is provided as is
for users who are interested in an efficient storage of Erlang
terms on disk only. Many applications just need to store some
terms in a file. Mnesia adds transactions, queries, and
distribution. The size of Dets files cannot exceed 2 GB. If larger
tables are needed, Mnesia's table fragmentation can be used.</p>
<p>There are three types of Dets tables: set, bag and
duplicate_bag. A table of type <strong>set</strong> has at most one object
with a given key. If an object with a key already present in the
table is inserted, the existing object is overwritten by the new
object. A table of type <strong>bag</strong> has zero or more different
objects with a given key. A table of type <strong>duplicate_bag</strong>
has zero or more possibly matching objects with a given key.</p>
<p>Dets tables must be opened before they can be updated or read,
and when finished they must be properly closed. If a table has not
been properly closed, Dets will automatically repair the table.
This can take a substantial time if the table is large. A Dets
table is closed when the process which opened the table
terminates. If several Erlang processes (users) open the same Dets
table, they will share the table. The table is properly closed
when all users have either terminated or closed the table. Dets
tables are not properly closed if the Erlang runtime system is
terminated abnormally.</p>
<div class="note">
<div class="label">Note</div>
<div class="content"><p>
<p>A ^C command abnormally terminates an Erlang runtime
system in a Unix environment with a break-handler.</p>
</p></div>
</div>
<p>Since all operations performed by Dets are disk operations, it
is important to realize that a single look-up operation involves a
series of disk seek and read operations. For this reason, the Dets
functions are much slower than the corresponding Ets functions,
although Dets exports a similar interface.</p>
<p>Dets organizes data as a linear hash list and the hash list
grows gracefully as more data is inserted into the table. Space
management on the file is performed by what is called a buddy
system. The current implementation keeps the entire buddy system
in RAM, which implies that if the table gets heavily fragmented,
quite some memory can be used up. The only way to defragment a
table is to close it and then open it again with the <span class="code">repair</span>
option set to <span class="code">force</span>.</p>
<p>It is worth noting that the ordered_set type present in Ets is
not yet implemented by Dets, neither is the limited support for
concurrent updates which makes a sequence of <span class="code">first</span> and
<span class="code">next</span> calls safe to use on fixed Ets tables. Both these
features will be implemented by Dets in a future release of
Erlang/OTP. Until then, the Mnesia application (or some user
implemented method for locking) has to be used to implement safe
concurrency. Currently, no library of Erlang/OTP has support for
ordered disk based term storage.</p>
<p>Two versions of the format used for storing objects on file are
supported by Dets. The first version, 8, is the format always used
for tables created by OTP R7 and earlier. The second version, 9,
is the default version of tables created by OTP R8 (and later OTP
releases). OTP R8 can create version 8 tables, and convert version
8 tables to version 9, and vice versa, upon request.
</p>
<p>All Dets functions return <span class="code">{error, Reason}</span> if an error
occurs (<span class="code">first/1</span> and <span class="code">next/2</span> are exceptions, they exit
the process with the error tuple). If given badly formed
arguments, all functions exit the process with a <span class="code">badarg</span>
message.</p>
</p></div>
<h3>DATA TYPES</h3>
<p>
<span class="bold_code"><a name="type-access">access()</a> = read | read_write</span><br></p>
<p>
<span class="bold_code"><a name="type-auto_save">auto_save()</a> = infinity | integer() >= 0</span><br></p>
<p>
<span class="bold_code"><a name="type-bindings_cont">bindings_cont()</a></span><br></p>
<div class="REFBODY"><p>
<p>Opaque continuation used by <span class="bold_code"><a href="#match-1">
<span class="code">match/1</span></a></span> and <span class="bold_code"><a href="#match-3">
<span class="code">match/3</span></a></span>.</p>
</p></div>
<p>
<span class="bold_code"><a name="type-cont">cont()</a></span><br></p>
<div class="REFBODY"><p>
<p>Opaque continuation used by <span class="bold_code"><a href="#bchunk-2">
<span class="code">bchunk/2</span></a></span>.</p>
</p></div>
<p>
<span class="bold_code"><a name="type-keypos">keypos()</a> = integer() >= 1</span><br></p>
<p>
<span class="bold_code"><a name="type-match_spec">match_spec()</a> = <span class="bold_code"><a href="ets.html#type-match_spec">ets:match_spec()</a></span></span><br></p>
<div class="REFBODY"><p>
<p>Match specifications, see the <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','erts','match_spec.html');">match specification</a></span>
documentation in the ERTS User's Guide and <span class="bold_code"><a href="ms_transform.html">ms_transform(3).</a></span></p>
</p></div>
<p>
<span class="bold_code"><a name="type-no_slots">no_slots()</a> = integer() >= 0 | default</span><br></p>
<p>
<span class="bold_code"><a name="type-object">object()</a> = tuple()</span><br></p>
<p>
<span class="bold_code"><a name="type-object_cont">object_cont()</a></span><br></p>
<div class="REFBODY"><p>
<p>Opaque continuation used by <span class="bold_code"><a href="#match_object-1">
<span class="code">match_object/1</span></a></span> and <span class="bold_code"><a href="#match_object-3">
<span class="code">match_object/3</span></a></span>.</p>
</p></div>
<p>
<span class="bold_code"><a name="type-pattern">pattern()</a> = atom() | tuple()</span><br></p>
<div class="REFBODY"><p>
<p>See <span class="bold_code"><a href="ets.html#match-2">ets:match/2</a></span> for a
description of patterns.</p>
</p></div>
<p>
<span class="bold_code"><a name="type-select_cont">select_cont()</a></span><br></p>
<div class="REFBODY"><p>
<p>Opaque continuation used by <span class="bold_code"><a href="#select-1">
<span class="code">select/1</span></a></span> and <span class="bold_code"><a href="#select-3">
<span class="code">select/3</span></a></span>.</p>
</p></div>
<p>
<span class="bold_code"><a name="type-tab_name">tab_name()</a> = term()</span><br></p>
<p>
<span class="bold_code"><a name="type-type">type()</a> = bag | duplicate_bag | set</span><br></p>
<p>
<span class="bold_code"><a name="type-version">version()</a> = 8 | 9 | default</span><br></p>
<h3>EXPORTS</h3>
<p><a name="all-0"></a><span class="bold_code">all() -> [<span class="bold_code"><a href="#type-tab_name">tab_name()</a></span>]</span><br></p>
<div class="REFBODY"><p>
<p>Returns a list of the names of all open tables on this
node.</p>
</p></div>
<p><a name="bchunk-2"></a><span class="bold_code">bchunk(Name, Continuation) -><br> {Continuation2, Data} |<br> '$end_of_table' |<br> {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Continuation = start | <span class="bold_code"><a href="#type-cont">cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Continuation2 = <span class="bold_code"><a href="#type-cont">cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Data = binary() | tuple()</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list of objects stored in a table. The exact
representation of the returned objects is not public. The
lists of data can be used for initializing a table by giving
the value <span class="code">bchunk</span> to the <span class="code">format</span> option of the
<span class="bold_code"><a href="#init_table-3"><span class="code">init_table/3</span></a></span>
function. The Mnesia application uses this
function for copying open tables.</p>
<p>Unless the table is protected using <span class="code">safe_fixtable/2</span>,
calls to <span class="code">bchunk/2</span> may not work as expected if
concurrent updates are made to the table.</p>
<p>The first time <span class="code">bchunk/2</span> is called, an initial
continuation, the atom <span class="code">start</span>, must be provided.</p>
<p>The <span class="code">bchunk/2</span> function returns a tuple
<span class="code">{Continuation2, Data}</span>,
where <span class="code">Data</span> is a list of
objects. <span class="code">Continuation2</span> is another continuation
which is
to be passed on to a subsequent call to <span class="code">bchunk/2</span>. With
a series of calls to <span class="code">bchunk/2</span> it is possible to extract
all objects of the table.
</p>
<p><span class="code">bchunk/2</span> returns <span class="code">'$end_of_table'</span> when all
objects have been returned, or <span class="code">{error, Reason}</span>
if an error occurs.
</p>
</p></div>
<p><a name="close-1"></a><span class="bold_code">close(Name) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Closes a table. Only processes that have opened a table are
allowed to close it.
</p>
<p>All open tables must be closed before the system is
stopped. If an attempt is made to open a table which has not
been properly closed, Dets automatically tries to repair the
table.</p>
</p></div>
<p><a name="delete-2"></a><span class="bold_code">delete(Name, Key) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Key = Reason = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Deletes all objects with the key <span class="code">Key</span> from
the table <span class="code">Name</span>.</p>
</p></div>
<p><a name="delete_all_objects-1"></a><span class="bold_code">delete_all_objects(Name) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Deletes all objects from a table in almost constant time.
However, if the table if fixed, <span class="code">delete_all_objects(T)</span>
is equivalent to <span class="code">match_delete(T, '_')</span>.</p>
</p></div>
<p><a name="delete_object-2"></a><span class="bold_code">delete_object(Name, Object) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Object = <span class="bold_code"><a href="#type-object">object()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Deletes all instances of a given object from a table. If a
table is of type <span class="code">bag</span> or <span class="code">duplicate_bag</span>, the
<span class="code">delete/2</span> function cannot be used to delete only some of
the objects with a given key. This function makes this
possible.</p>
</p></div>
<p><a name="first-1"></a><span class="bold_code">first(Name) -> Key | '$end_of_table'</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Key = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the first key stored in the table <span class="code">Name</span>
according to the table's internal order, or
<span class="code">'$end_of_table'</span> if the table is empty.</p>
<p>Unless the table is protected using <span class="code">safe_fixtable/2</span>,
subsequent calls to <span class="bold_code"><a href="#next-2"><span class="code">next/2</span></a></span>
may not work as expected if
concurrent updates are made to the table.</p>
<p>Should an error occur, the process is exited with an error
tuple <span class="code">{error, Reason}</span>. The reason for not returning the
error tuple is that it cannot be distinguished from a key.</p>
<p>There are two reasons why <span class="code">first/1</span> and <span class="code">next/2</span>
should not be used: they are not very efficient, and they
prevent the use of the key <span class="code">'$end_of_table'</span> since this
atom is used to indicate the end of the table. If possible,
the <span class="code">match</span>, <span class="code">match_object</span>, and <span class="code">select</span>
functions should be used for traversing tables.</p>
</p></div>
<p><a name="foldl-3"></a><span class="bold_code">foldl(Function, Acc0, Name) -> Acc | {error, Reason}</span><br><a name="foldr-3"></a><span class="bold_code">foldr(Function, Acc0, Name) -> Acc | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Function = fun((Object :: <span class="bold_code"><a href="#type-object">object()</a></span>, AccIn) -> AccOut)</span></div>
<div class="REFTYPES"><span class="bold_code">Acc0 = Acc = AccIn = AccOut = Reason = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Calls <span class="code">Function</span> on successive elements of
the table <span class="code">Name</span> together with an extra argument
<span class="code">AccIn</span>. The
order in which the elements of the table are traversed is
unspecified. <span class="code">Function</span> must return a new
accumulator which is passed to the next call.
<span class="code">Acc0</span> is returned if
the table is empty.</p>
</p></div>
<p><a name="from_ets-2"></a><span class="bold_code">from_ets(Name, EtsTab) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">EtsTab = <span class="bold_code"><a href="ets.html#type-tab">ets:tab()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Deletes all objects of the table <span class="code">Name</span> and then
inserts all the objects of the Ets table <span class="code">EtsTab</span>.
The order in which the objects are inserted is not specified.
Since <span class="code">ets:safe_fixtable/2</span> is called the Ets table must
be public or owned by the calling process.</p>
</p></div>
<p><a name="info-1"></a><span class="bold_code">info(Name) -> InfoList | undefined</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">InfoList = [InfoTuple]</span></div>
<div class="REFTYPES"><span class="bold_code">InfoTuple = {file_size, integer() >= 0}<br> | {filename, <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','file.html#type-name');">file:name()</a></span>}<br> | {keypos, <span class="bold_code"><a href="#type-keypos">keypos()</a></span>}<br> | {size, integer() >= 0}<br> | {type, <span class="bold_code"><a href="#type-type">type()</a></span>}</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns information about the table <span class="code">Name</span>
as a list of tuples:</p>
<ul>
<li>
<p><span class="code">{file_size, integer() >= 0}</span>, the size of the file in
bytes.</p>
</li>
<li>
<p><span class="code">{filename, <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','file.html#type-name');">file:name()</a></span>}</span>,
the name of the file where objects are stored.</p>
</li>
<li>
<p><span class="code">{keypos, <span class="bold_code"><a href="#type-keypos">keypos()</a></span>}
</span>, the position of the key.</p>
</li>
<li>
<p><span class="code">{size, integer() >= 0}</span>, the number of objects stored
in the table.</p>
</li>
<li>
<p><span class="code">{type, <span class="bold_code"><a href="#type-type">type()</a></span>}</span>,
the type of the table.</p>
</li>
</ul>
</p></div>
<p><a name="info-2"></a><span class="bold_code">info(Name, Item) -> Value | undefined</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Item = access<br> | auto_save<br> | bchunk_format<br> | hash<br> | file_size<br> | filename<br> | keypos<br> | memory<br> | no_keys<br> | no_objects<br> | no_slots<br> | owner<br> | ram_file<br> | safe_fixed<br> | size<br> | type<br> | version</span></div>
<div class="REFTYPES"><span class="bold_code">Value = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the information associated with <span class="code">Item</span>
for the table <span class="code">Name</span>.
In addition to the <span class="code">{Item, Value}</span>
pairs defined for <span class="code">info/1</span>, the following items are
allowed:</p>
<ul>
<li>
<p><span class="code">{access, <span class="bold_code"><a href="#type-access">access()</a></span>}
</span>, the access mode.</p>
</li>
<li>
<p><span class="code">{auto_save, <span class="bold_code"><a href="#type-auto_save">
auto_save()</a></span>}</span>, the auto save interval.</p>
</li>
<li>
<p><span class="code">{bchunk_format, binary()}</span>, an opaque binary
describing the format of the objects returned by
<span class="code">bchunk/2</span>. The binary can be used as argument to
<span class="code">is_compatible_chunk_format/2</span>. Only available for
version 9 tables.</p>
</li>
<li>
<p><span class="code">{hash,</span> Hash<span class="code">}</span>. Describes which BIF is
used to calculate the hash values of the objects stored in
the Dets table. Possible values of Hash are <span class="code">hash</span>,
which implies that the <span class="code">erlang:hash/2</span> BIF is used,
<span class="code">phash</span>, which implies that the <span class="code">erlang:phash/2</span>
BIF is used, and <span class="code">phash2</span>, which implies that the
<span class="code">erlang:phash2/1</span> BIF is used.</p>
</li>
<li>
<p><span class="code">{memory, integer() >= 0}</span>, the size of the file in
bytes. The same value is associated with the item
<span class="code">file_size</span>.</p>
</li>
<li>
<p><span class="code">{no_keys, integer >= 0()}</span>, the number of different
keys stored in the table. Only available for version 9
tables.</p>
</li>
<li>
<p><span class="code">{no_objects, integer >= 0()}</span>, the number of objects
stored in the table.</p>
</li>
<li>
<p><span class="code">{no_slots, {</span>Min<span class="code">, </span>Used<span class="code">, </span>Max<span class="code">}}</span>,
the number of
slots of the table. <span class="code">Min</span> is the minimum number of
slots, <span class="code">Used</span> is the number of currently used slots,
and <span class="code">Max</span> is the maximum number of slots. Only
available for version 9 tables.</p>
</li>
<li>
<p><span class="code">{owner, pid()}</span>, the pid of the process that
handles requests to the Dets table.</p>
</li>
<li>
<p><span class="code">{ram_file, boolean()}</span>, whether the table is
kept in RAM.</p>
</li>
<li>
<p><span class="code">{safe_fixed,</span> SafeFixed<span class="code">}</span>. If the table
is fixed, SafeFixed is a tuple <span class="code">{FixedAtTime, [{Pid,RefCount}]}</span>. <span class="code">FixedAtTime</span> is the time when
the table was first fixed, and <span class="code">Pid</span> is the pid of
the process that fixes the table <span class="code">RefCount</span> times.
There may be any number of processes in the list. If the
table is not fixed, SafeFixed is the atom <span class="code">false</span>.</p>
</li>
<li>
<p><span class="code">{version, integer()</span>, the version of the format of
the table.</p>
</li>
</ul>
</p></div>
<p><a name="init_table-2"></a><span class="bold_code">init_table(Name, InitFun) -> ok | {error, Reason}</span><br><a name="init_table-3"></a><span class="bold_code">init_table(Name, InitFun, Options) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">InitFun = fun((Arg) -> Res)</span></div>
<div class="REFTYPES"><span class="bold_code">Arg = read | close</span></div>
<div class="REFTYPES"><span class="bold_code">Res = end_of_input<br> | {[<span class="bold_code"><a href="#type-object">object()</a></span>], InitFun}<br> | {Data, InitFun}<br> | term()</span></div>
<div class="REFTYPES"><span class="bold_code">Options = Option | [Option]</span></div>
<div class="REFTYPES"><span class="bold_code">Option = {min_no_slots, <span class="bold_code"><a href="#type-no_slots">no_slots()</a></span>} | {format, term | bchunk}</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
<div class="REFTYPES"><span class="bold_code">Data = binary() | tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Replaces the existing objects of the table <span class="code">Name</span>
with objects created by calling the input function
<span class="code">InitFun</span>,
see below. The reason for using this function rather than
calling <span class="code">insert/2</span> is that of efficiency. It should be
noted that the input functions are called by the process that
handles requests to the Dets table, not by the calling
process.</p>
<p>When called with the argument <span class="code">read</span> the function
<span class="code">InitFun</span> is assumed to return
<span class="code">end_of_input</span> when
there is no more input, or <span class="code">{Objects, Fun}</span>, where
<span class="code">Objects</span> is a list of objects and <span class="code">Fun</span> is a new
input function. Any other value Value is returned as an error
<span class="code">{error, {init_fun, Value}}</span>. Each input function will be
called exactly once, and should an error occur, the last
function is called with the argument <span class="code">close</span>, the reply
of which is ignored.</p>
<p>If the type of the table is <span class="code">set</span> and there is more
than one object with a given key, one of the objects is
chosen. This is not necessarily the last object with the given
key in the sequence of objects returned by the input
functions. Duplicate keys should be avoided, or the file
will be unnecessarily fragmented. This holds also for duplicated
objects stored in tables of type <span class="code">bag</span>.</p>
<p>It is important that the table has a sufficient number of
slots for the objects. If not, the hash list will start to
grow when <span class="code">init_table/2</span> returns which will significantly
slow down access to the table for a period of time. The
minimum number of slots is set by the <span class="code">open_file/2</span>
option <span class="code">min_no_slots</span> and returned by the <span class="code">info/2</span>
item <span class="code">no_slots</span>. See also the <span class="code">min_no_slots</span> option
below.
</p>
<p>The <span class="code">Options</span> argument is a list of
<span class="code">{Key, Val}</span>
tuples where the following values are allowed:</p>
<ul>
<li>
<p><span class="code">{min_no_slots, no_slots()}</span>. Specifies the
estimated number of different keys that will be stored
in the table. The <span class="code">open_file</span> option with the same
name is ignored unless the table is created, and in that
case performance can be enhanced by supplying an
estimate when initializing the table.</p>
</li>
<li>
<p><span class="code">{format, Format}</span>. Specifies the format of the
objects returned by the function <span class="code">InitFun</span>. If
<span class="code">Format</span> is <span class="code">term</span> (the default),
<span class="code">InitFun</span> is assumed to return a list of tuples. If
<span class="code">Format</span> is <span class="code">bchunk</span>, <span class="code">InitFun</span> is
assumed to return <span class="code">Data</span> as returned by
<span class="bold_code"><a href="#bchunk-2"><span class="code">bchunk/2</span></a></span>.
This option overrides the
<span class="code">min_no_slots</span> option.</p>
</li>
</ul>
</p></div>
<p><a name="insert-2"></a><span class="bold_code">insert(Name, Objects) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Objects = <span class="bold_code"><a href="#type-object">object()</a></span> | [<span class="bold_code"><a href="#type-object">object()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Inserts one or more objects into the table <span class="code">Name</span>.
If there already exists an object with a key matching the key of
some of the given objects and the table type is <span class="code">set</span>,
the old object will be replaced.</p>
</p></div>
<p><a name="insert_new-2"></a><span class="bold_code">insert_new(Name, Objects) -> boolean()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Objects = <span class="bold_code"><a href="#type-object">object()</a></span> | [<span class="bold_code"><a href="#type-object">object()</a></span>]</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Inserts one or more objects into the table <span class="code">Name</span>.
If there already exists some object with a key matching the key
of any of the given objects the table is not updated and
<span class="code">false</span> is returned, otherwise the objects are inserted
and <span class="code">true</span> returned.</p>
</p></div>
<p><a name="is_compatible_bchunk_format-2"></a><span class="bold_code">is_compatible_bchunk_format(Name, BchunkFormat) -> boolean()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">BchunkFormat = binary()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns <span class="code">true</span> if it would be possible to initialize
the table <span class="code">Name</span>, using
<span class="bold_code"><a href="#init_table-3"><span class="code">init_table/3</span></a></span>
with the
option <span class="code">{format, bchunk}</span>, with objects read with
<span class="bold_code"><a href="#bchunk-2"><span class="code">bchunk/2</span></a></span> from some
table <span class="code">T</span> such that calling
<span class="code">info(T, bchunk_format)</span> returns
<span class="code">BchunkFormat</span>.</p>
</p></div>
<p><a name="is_dets_file-1"></a><span class="bold_code">is_dets_file(Filename) -> boolean() | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Filename = <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','file.html#type-name');">file:name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns <span class="code">true</span> if the file <span class="code">Filename</span>
is a Dets table, <span class="code">false</span> otherwise.</p>
</p></div>
<p><a name="lookup-2"></a><span class="bold_code">lookup(Name, Key) -> Objects | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Key = term()</span></div>
<div class="REFTYPES"><span class="bold_code">Objects = [<span class="bold_code"><a href="#type-object">object()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list of all objects with the key <span class="code">Key</span>
stored in the table <span class="code">Name</span>. For example:</p>
<div class="example"><pre>
2> <span class="bold_code">dets:open_file(abc, [{type, bag}]).</span>
{ok,abc}
3> <span class="bold_code">dets:insert(abc, {1,2,3}).</span>
ok
4> <span class="bold_code">dets:insert(abc, {1,3,4}).</span>
ok
5> <span class="bold_code">dets:lookup(abc, 1).</span>
[{1,2,3},{1,3,4}] </pre></div>
<p>If the table is of type <span class="code">set</span>, the function returns
either the empty list or a list with one object, as there
cannot be more than one object with a given key. If the table
is of type <span class="code">bag</span> or <span class="code">duplicate_bag</span>, the function
returns a list of arbitrary length.</p>
<p>Note that the order of objects returned is unspecified. In
particular, the order in which objects were inserted is not
reflected.</p>
</p></div>
<p><a name="match-1"></a><span class="bold_code">match(Continuation) -><br> {[Match], Continuation2} |<br> '$end_of_table' |<br> {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Continuation = Continuation2 = <span class="bold_code"><a href="#type-bindings_cont">bindings_cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Match = [term()]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Matches some objects stored in a table and returns a
non-empty list of the bindings that match a given pattern in
some unspecified order. The table, the pattern, and the number
of objects that are matched are all defined by
<span class="code">Continuation</span>, which has been returned by a prior
call to <span class="code">match/1</span> or <span class="code">match/3</span>.</p>
<p>When all objects of the table have been matched,
<span class="code">'$end_of_table'</span> is returned.</p>
</p></div>
<p><a name="match-2"></a><span class="bold_code">match(Name, Pattern) -> [Match] | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Pattern = <span class="bold_code"><a href="#type-pattern">pattern()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Match = [term()]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns for each object of the table <span class="code">Name</span> that
matches <span class="code">Pattern</span> a list of bindings in some unspecified
order. See <span class="bold_code"><a href="ets.html#match-2">ets:match/2</a></span> for a
description of patterns. If the keypos'th element of
<span class="code">Pattern</span> is unbound, all objects of the table are
matched. If the keypos'th element is bound, only the
objects with the right key are matched.</p>
</p></div>
<p><a name="match-3"></a><span class="bold_code">match(Name, Pattern, N) -><br> {[Match], Continuation} |<br> '$end_of_table' |<br> {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Pattern = <span class="bold_code"><a href="#type-pattern">pattern()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">N = default | integer() >= 0</span></div>
<div class="REFTYPES"><span class="bold_code">Continuation = <span class="bold_code"><a href="#type-bindings_cont">bindings_cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Match = [term()]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Matches some or all objects of the table <span class="code">Name</span> and
returns a non-empty list of the bindings that match
<span class="code">Pattern</span> in some unspecified order.
See <span class="bold_code"><a href="ets.html#match-2">ets:match/2</a></span> for a
description of patterns.</p>
<p>A tuple of the bindings and a continuation is returned,
unless the table is empty, in which case
<span class="code">'$end_of_table'</span> is returned. The continuation is to be
used when matching further objects by calling
<span class="bold_code"><a href="#match-1"><span class="code">match/1</span></a></span>.</p>
<p>If the keypos'th element of <span class="code">Pattern</span> is bound,
all objects of the table are matched. If the keypos'th element is
unbound, all objects of the table are matched, <span class="code">N</span>
objects at a time, until at least one object matches or the
end of the table has been reached. The default, indicated by
giving <span class="code">N</span> the value <span class="code">default</span>,
is to let the number
of objects vary depending on the sizes of the objects. If
<span class="code">Name</span> is a version 9 table, all objects with the same
key are always matched at the same time which implies that
more than N objects may sometimes be matched.
</p>
<p>The table should always be protected using
<span class="code">safe_fixtable/2</span> before calling <span class="code">match/3</span>, or
errors may occur when calling <span class="code">match/1</span>.</p>
</p></div>
<p><a name="match_delete-2"></a><span class="bold_code">match_delete(Name, Pattern) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Pattern = <span class="bold_code"><a href="#type-pattern">pattern()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Deletes all objects that match <span class="code">Pattern</span> from the
table <span class="code">Name</span>.
See <span class="bold_code"><a href="ets.html#match-2">ets:match/2</a></span> for a
description of patterns.</p>
<p>If the keypos'th element of <span class="code">Pattern</span> is bound,
only the objects with the right key are matched.</p>
</p></div>
<p><a name="match_object-1"></a><span class="bold_code">match_object(Continuation) -><br> {Objects, Continuation2} |<br> '$end_of_table' |<br> {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Continuation = Continuation2 = <span class="bold_code"><a href="#type-object_cont">object_cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Objects = [<span class="bold_code"><a href="#type-object">object()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a non-empty list of some objects stored in a table
that match a given pattern in some unspecified order. The
table, the pattern, and the number of objects that are matched
are all defined by <span class="code">Continuation</span>, which has been
returned by a prior call to <span class="code">match_object/1</span> or
<span class="code">match_object/3</span>.</p>
<p>When all objects of the table have been matched,
<span class="code">'$end_of_table'</span> is returned.</p>
</p></div>
<p><a name="match_object-2"></a><span class="bold_code">match_object(Name, Pattern) -> Objects | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Pattern = <span class="bold_code"><a href="#type-pattern">pattern()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Objects = [<span class="bold_code"><a href="#type-object">object()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list of all objects of the table <span class="code">Name</span> that
match <span class="code">Pattern</span> in some unspecified order.
See <span class="bold_code"><a href="ets.html#match-2">ets:match/2</a></span> for a
description of patterns.
</p>
<p>If the keypos'th element of <span class="code">Pattern</span> is
unbound, all objects of the table are matched. If the
keypos'th element of <span class="code">Pattern</span> is bound, only the
objects with the right key are matched.</p>
<p>Using the <span class="code">match_object</span> functions for traversing all
objects of a table is more efficient than calling
<span class="code">first/1</span> and <span class="code">next/2</span> or <span class="code">slot/2</span>.</p>
</p></div>
<p><a name="match_object-3"></a><span class="bold_code">match_object(Name, Pattern, N) -><br> {Objects, Continuation} |<br> '$end_of_table' |<br> {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Pattern = <span class="bold_code"><a href="#type-pattern">pattern()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">N = default | integer() >= 0</span></div>
<div class="REFTYPES"><span class="bold_code">Continuation = <span class="bold_code"><a href="#type-object_cont">object_cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Objects = [<span class="bold_code"><a href="#type-object">object()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Matches some or all objects stored in the table <span class="code">Name</span>
and returns a non-empty list of the objects that match
<span class="code">Pattern</span> in some unspecified order.
See <span class="bold_code"><a href="ets.html#match-2">ets:match/2</a></span> for a
description of patterns.</p>
<p>A list of objects and a continuation is returned, unless
the table is empty, in which case <span class="code">'$end_of_table'</span>
is returned. The continuation is to be used when matching
further objects by calling <span class="code">match_object/1</span>.</p>
<p>If the keypos'th element of <span class="code">Pattern</span> is bound, all
objects of the table are matched. If the keypos'th element is
unbound, all objects of the table are matched, <span class="code">N</span>
objects at a time, until at least one object matches or the
end of the table has been reached. The default, indicated by
giving <span class="code">N</span> the value <span class="code">default</span>, is to let the number
of objects vary depending on the sizes of the objects. If
<span class="code">Name</span> is a version 9 table, all matching objects with
the same key are always returned in the same reply which
implies that more than N objects may sometimes be returned.
</p>
<p>The table should always be protected using
<span class="code">safe_fixtable/2</span> before calling <span class="code">match_object/3</span>,
or errors may occur when calling <span class="code">match_object/1</span>.</p>
</p></div>
<p><a name="member-2"></a><span class="bold_code">member(Name, Key) -> boolean() | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Key = Reason = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Works like <span class="code">lookup/2</span>, but does not return the
objects. The function returns <span class="code">true</span> if one or more
elements of the table has the key <span class="code">Key</span>, <span class="code">false</span>
otherwise.</p>
</p></div>
<p><a name="next-2"></a><span class="bold_code">next(Name, Key1) -> Key2 | '$end_of_table'</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Key1 = Key2 = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the key following <span class="code">Key1</span> in the table
<span class="code">Name</span> according to the table's internal order, or
<span class="code">'$end_of_table'</span> if there is no next key.</p>
<p>Should an error occur, the process is exited with an error
tuple <span class="code">{error, Reason}</span>.</p>
<p>Use <span class="bold_code"><a href="#first-1"><span class="code">first/1</span></a></span> to find
the first key in the table.</p>
</p></div>
<p><a name="open_file-1"></a><span class="bold_code">open_file(Filename) -> {ok, Reference} | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Filename = <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','file.html#type-name');">file:name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reference = reference()</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Opens an existing table. If the table has not been properly
closed, it will be repaired. The returned reference is to be
used as the name of the table. This function is most useful
for debugging purposes.</p>
</p></div>
<p><a name="open_file-2"></a><span class="bold_code">open_file(Name, Args) -> {ok, Name} | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Args = [OpenArg]</span></div>
<div class="REFTYPES"><span class="bold_code">OpenArg = {access, <span class="bold_code"><a href="#type-access">access()</a></span>}<br> | {auto_save, <span class="bold_code"><a href="#type-auto_save">auto_save()</a></span>}<br> | {estimated_no_objects, integer() >= 0}<br> | {file, <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','file.html#type-name');">file:name()</a></span>}<br> | {max_no_slots, <span class="bold_code"><a href="#type-no_slots">no_slots()</a></span>}<br> | {min_no_slots, <span class="bold_code"><a href="#type-no_slots">no_slots()</a></span>}<br> | {keypos, <span class="bold_code"><a href="#type-keypos">keypos()</a></span>}<br> | {ram_file, boolean()}<br> | {repair, boolean() | force}<br> | {type, <span class="bold_code"><a href="#type-type">type()</a></span>}<br> | {version, <span class="bold_code"><a href="#type-version">version()</a></span>}</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Opens a table. An empty Dets table is created if no file
exists.</p>
<p>The atom <span class="code">Name</span> is the name of the table. The table
name must be provided in all subsequent operations on the
table. The name can be used by other processes as well, and
several process can share one table.
</p>
<p>If two processes open the same table by giving the same
name and arguments, then the table will have two users. If one
user closes the table, it still remains open until the second
user closes the table.</p>
<p>The <span class="code">Args</span> argument is a list of <span class="code">{Key, Val}</span>
tuples where the following values are allowed:</p>
<ul>
<li>
<p><span class="code">{access, <span class="bold_code"><a href="#type-access">
access()</a></span>}</span>. It is possible to open
existing tables in read-only mode. A table which is opened
in read-only mode is not subjected to the automatic file
reparation algorithm if it is later opened after a crash.
The default value is <span class="code">read_write</span>.</p>
</li>
<li>
<p><span class="code">{auto_save, <span class="bold_code"><a href="#type-auto_save">
auto_save()</a></span>}</span>, the auto save
interval. If the interval is an integer <span class="code">Time</span>, the
table is flushed to disk whenever it is not accessed for
<span class="code">Time</span> milliseconds. A table that has been flushed
will require no reparation when reopened after an
uncontrolled emulator halt. If the interval is the atom
<span class="code">infinity</span>, auto save is disabled. The default value
is 180000 (3 minutes).</p>
</li>
<li>
<p><span class="code">{estimated_no_objects, <span class="bold_code"><a href="#type-no_slots">
no_slots()</a></span>}</span>. Equivalent to the
<span class="code">min_no_slots</span> option.</p>
</li>
<li>
<p><span class="code">{file, <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','file.html#type-name');">
file:name()</a></span>}</span>, the name of the file to be
opened. The default value is the name of the table.</p>
</li>
<li>
<p><span class="code">{max_no_slots, <span class="bold_code"><a href="#type-no_slots">
no_slots()</a></span>}</span>, the maximum number
of slots that will be used. The default value as well as
the maximal value is 32 M. Note that a higher value may
increase the fragmentation of the table, and conversely,
that a smaller value may decrease the fragmentation, at
the expense of execution time. Only available for version
9 tables.</p>
</li>
<li>
<p><span class="code">{min_no_slots, <span class="bold_code"><a href="#type-no_slots">
no_slots()</a></span>}</span>. Application
performance can be enhanced with this flag by specifying,
when the table is created, the estimated number of
different keys that will be stored in the table. The
default value as well as the minimum value is 256.</p>
</li>
<li>
<p><span class="code">{keypos, <span class="bold_code"><a href="#type-keypos">
keypos()</a></span>}</span>, the position of the
element of each object to be used as key. The default
value is 1. The ability to explicitly state the key
position is most convenient when we want to store Erlang
records in which the first position of the record is the
name of the record type.</p>
</li>
<li>
<p><span class="code">{ram_file, boolean()}</span>, whether the table is to
be kept in RAM. Keeping the table in RAM may sound like an
anomaly, but can enhance the performance of applications
which open a table, insert a set of objects, and then
close the table. When the table is closed, its contents
are written to the disk file. The default value is
<span class="code">false</span>.</p>
</li>
<li>
<p><span class="code">{repair, Value}</span>. <span class="code">Value</span> can be either
a <span class="code">boolean()</span> or the atom <span class="code">force</span>. The flag
specifies whether the Dets server should invoke the
automatic file reparation algorithm. The default is
<span class="code">true</span>. If <span class="code">false</span> is specified, there is no
attempt to repair the file and <span class="code">{error, {needs_repair,
FileName}}</span> is returned if the table needs to be
repaired.</p>
<p>The value <span class="code">force</span> means that a reparation will
take place even if the table has been properly closed.
This is how to convert tables created by older versions of
STDLIB. An example is tables hashed with the deprecated
<span class="code">erlang:hash/2</span> BIF. Tables created with Dets from a
STDLIB version of 1.8.2 and later use the
<span class="code">erlang:phash/2</span> function or the
<span class="code">erlang:phash2/1</span> function, which is preferred.</p>
<p>The <span class="code">repair</span> option is ignored if the table is
already open.</p>
</li>
<li>
<p><span class="code">{type, <span class="bold_code"><a href="#type-type">type()</a></span>}</span>,
the type of the table. The default value is <span class="code">set</span>.</p>
</li>
<li>
<p><span class="code">{version, <span class="bold_code"><a href="#type-version">
version()</a></span>}</span>, the version of the format
used for the table. The default value is <span class="code">9</span>. Tables
on the format used before OTP R8 can be created by giving
the value <span class="code">8</span>. A version 8 table can be converted to
a version 9 table by giving the options <span class="code">{version,9}</span>
and <span class="code">{repair,force}</span>.</p>
</li>
</ul>
</p></div>
<p><a name="pid2name-1"></a><span class="bold_code">pid2name(Pid) -> {ok, Name} | undefined</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Pid = pid()</span></div>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the name of the table given the pid of a process
that handles requests to a table, or <span class="code">undefined</span> if
there is no such table.</p>
<p>This function is meant to be used for debugging only.</p>
</p></div>
<p><a name="repair_continuation-2"></a><span class="bold_code">repair_continuation(Continuation, MatchSpec) -> Continuation2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Continuation = Continuation2 = <span class="bold_code"><a href="#type-select_cont">select_cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">MatchSpec = <span class="bold_code"><a href="#type-match_spec">match_spec()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>This function can be used to restore an opaque continuation
returned by <span class="code">select/3</span> or <span class="code">select/1</span> if the
continuation has passed through external term format (been
sent between nodes or stored on disk).</p>
<p>The reason for this function is that continuation terms
contain compiled match specifications and therefore will be
invalidated if converted to external term format. Given that
the original match specification is kept intact, the
continuation can be restored, meaning it can once again be
used in subsequent <span class="code">select/1</span> calls even though it has
been stored on disk or on another node.</p>
<p>See also <span class="code">ets(3)</span> for further explanations and
examples.
</p>
<div class="note">
<div class="label">Note</div>
<div class="content"><p>
<p>This function is very rarely needed in application code. It
is used by Mnesia to implement distributed <span class="code">select/3</span>
and <span class="code">select/1</span> sequences. A normal application would
either use Mnesia or keep the continuation from being
converted to external format.</p>
<p>The reason for not having an external representation of
compiled match specifications is performance. It may be
subject to change in future releases, while this interface
will remain for backward compatibility.</p>
</p></div>
</div>
</p></div>
<p><a name="safe_fixtable-2"></a><span class="bold_code">safe_fixtable(Name, Fix) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Fix = boolean()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>If <span class="code">Fix</span> is <span class="code">true</span>, the table
<span class="code">Name</span> is
fixed (once more) by the calling process, otherwise the table
is released. The table is also released when a fixing process
terminates.
</p>
<p>If several processes fix a table, the table will remain
fixed until all processes have released it or terminated. A
reference counter is kept on a per process basis, and N
consecutive fixes require N releases to release the table.</p>
<p>It is not guaranteed that calls to <span class="code">first/1</span>,
<span class="code">next/2</span>, select and match functions work as expected
even if the table has been fixed; the limited support for
concurrency implemented in Ets has not yet been implemented
in Dets. Fixing a table currently only disables resizing of
the hash list of the table.</p>
<p>If objects have been added while the table was fixed, the
hash list will start to grow when the table is released which
will significantly slow down access to the table for a period
of time.</p>
</p></div>
<p><a name="select-1"></a><span class="bold_code">select(Continuation) -><br> {Selection, Continuation2} |<br> '$end_of_table' |<br> {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Continuation = Continuation2 = <span class="bold_code"><a href="#type-select_cont">select_cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Selection = [term()]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Applies a match specification to some objects stored in a
table and returns a non-empty list of the results. The
table, the match specification, and the number of objects
that are matched are all defined by <span class="code">Continuation</span>,
which has been returned by a prior call to <span class="code">select/1</span>
or <span class="code">select/3</span>.</p>
<p>When all objects of the table have been matched,
<span class="code">'$end_of_table'</span> is returned.</p>
</p></div>
<p><a name="select-2"></a><span class="bold_code">select(Name, MatchSpec) -> Selection | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">MatchSpec = <span class="bold_code"><a href="#type-match_spec">match_spec()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Selection = [term()]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the results of applying the match specification
<span class="code">MatchSpec</span> to all or some objects stored in the table
<span class="code">Name</span>. The order of the objects is not specified. See
the ERTS User's Guide for a description of match
specifications.</p>
<p>If the keypos'th element of <span class="code">MatchSpec</span> is
unbound, the match specification is applied to all objects of
the table. If the keypos'th element is bound, the match
specification is applied to the objects with the right key(s)
only.</p>
<p>Using the <span class="code">select</span> functions for traversing all
objects of a table is more efficient than calling
<span class="code">first/1</span> and <span class="code">next/2</span> or <span class="code">slot/2</span>.
</p>
</p></div>
<p><a name="select-3"></a><span class="bold_code">select(Name, MatchSpec, N) -><br> {Selection, Continuation} |<br> '$end_of_table' |<br> {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">MatchSpec = <span class="bold_code"><a href="#type-match_spec">match_spec()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">N = default | integer() >= 0</span></div>
<div class="REFTYPES"><span class="bold_code">Continuation = <span class="bold_code"><a href="#type-select_cont">select_cont()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Selection = [term()]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the results of applying the match specification
<span class="code">MatchSpec</span> to some or all objects stored in the table
<span class="code">Name</span>. The order of the objects is not specified. See
the ERTS User's Guide for a description of match
specifications.</p>
<p>A tuple of the results of applying the match specification
and a continuation is returned, unless the table is empty,
in which case <span class="code">'$end_of_table'</span> is returned. The
continuation is to be used when matching further objects by
calling <span class="code">select/1</span>.</p>
<p>If the keypos'th element of <span class="code">MatchSpec</span> is bound, the
match specification is applied to all objects of the table
with the right key(s). If the keypos'th element of
<span class="code">MatchSpec</span> is unbound, the match specification is
applied to all objects of the table, <span class="code">N</span> objects at a
time, until at least one object matches or the end of the
table has been reached. The default, indicated by giving
<span class="code">N</span> the value <span class="code">default</span>, is to let the number of
objects vary depending on the sizes of the objects. If
<span class="code">Name</span> is a version 9 table, all objects with the same
key are always handled at the same time which implies that the
match specification may be applied to more than N objects.
</p>
<p>The table should always be protected using
<span class="code">safe_fixtable/2</span> before calling <span class="code">select/3</span>, or
errors may occur when calling <span class="code">select/1</span>.</p>
</p></div>
<p><a name="select_delete-2"></a><span class="bold_code">select_delete(Name, MatchSpec) -> N | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">MatchSpec = <span class="bold_code"><a href="#type-match_spec">match_spec()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 0</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Deletes each object from the table <span class="code">Name</span> such that
applying the match specification <span class="code">MatchSpec</span> to the
object returns the value <span class="code">true</span>. See the ERTS
User's Guide for a description of match
specifications. Returns the number of deleted objects.</p>
<p>If the keypos'th element of <span class="code">MatchSpec</span> is
bound, the match specification is applied to the objects
with the right key(s) only.</p>
</p></div>
<p><a name="slot-2"></a><span class="bold_code">slot(Name, I) -> '$end_of_table' | Objects | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">I = integer() >= 0</span></div>
<div class="REFTYPES"><span class="bold_code">Objects = [<span class="bold_code"><a href="#type-object">object()</a></span>]</span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>The objects of a table are distributed among slots,
starting with slot <span class="code">0</span> and ending with slot n. This
function returns the list of objects associated with slot
<span class="code">I</span>. If <span class="code">I</span> is greater than n
<span class="code">'$end_of_table'</span> is returned.</p>
</p></div>
<p><a name="sync-1"></a><span class="bold_code">sync(Name) -> ok | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Ensures that all updates made to the table <span class="code">Name</span> are
written to disk. This also applies to tables which have been
opened with the <span class="code">ram_file</span> flag set to <span class="code">true</span>. In
this case, the contents of the RAM file are flushed to
disk.</p>
<p>Note that the space management data structures kept in RAM,
the buddy system, is also written to the disk. This may take
some time if the table is fragmented.</p>
</p></div>
<p><a name="table-1"></a><span class="bold_code">table(Name) -> QueryHandle</span><br><a name="table-2"></a><span class="bold_code">table(Name, Options) -> QueryHandle</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Options = Option | [Option]</span></div>
<div class="REFTYPES"><span class="bold_code">Option = {n_objects, Limit} | {traverse, TraverseMethod}</span></div>
<div class="REFTYPES"><span class="bold_code">Limit = default | integer() >= 1</span></div>
<div class="REFTYPES"><span class="bold_code">TraverseMethod = first_next | select | {select, <span class="bold_code"><a href="#type-match_spec">match_spec()</a></span>}</span></div>
<div class="REFTYPES"><span class="bold_code">QueryHandle = <span class="bold_code"><a href="qlc.html#type-query_handle">qlc:query_handle()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p><a name="qlc_table"></a>Returns a QLC (Query List
Comprehension) query handle. The module <span class="code">qlc</span>
implements a query language aimed mainly at Mnesia but Ets
tables, Dets tables, and lists are also recognized by <span class="code">qlc</span>
as sources of data. Calling <span class="code">dets:table/1,2</span> is the
means to make the Dets table <span class="code">Name</span> usable to <span class="code">qlc</span>.</p>
<p>When there are only simple restrictions on the key position
<span class="code">qlc</span> uses <span class="code">dets:lookup/2</span> to look up the keys, but when
that is not possible the whole table is traversed. The
option <span class="code">traverse</span> determines how this is done:</p>
<ul>
<li>
<p><span class="code">first_next</span>. The table is traversed one key at
a time by calling <span class="code">dets:first/1</span> and
<span class="code">dets:next/2</span>.</p>
</li>
<li>
<p><span class="code">select</span>. The table is traversed by calling
<span class="code">dets:select/3</span> and <span class="code">dets:select/1</span>. The option
<span class="code">n_objects</span> determines the number of objects
returned (the third argument of <span class="code">select/3</span>). The
match specification (the second argument of
<span class="code">select/3</span>) is assembled by <span class="code">qlc</span>: simple filters are
translated into equivalent match specifications while
more complicated filters have to be applied to all
objects returned by <span class="code">select/3</span> given a match
specification that matches all objects.</p>
</li>
<li>
<p><span class="code">{select, <span class="bold_code"><a href="#type-match_spec">
match_spec()}</a></span></span>. As for <span class="code">select</span>
the table is traversed by calling <span class="code">dets:select/3</span>
and <span class="code">dets:select/1</span>. The difference is that the
match specification is explicitly given. This is how to
state match specifications that cannot easily be
expressed within the syntax provided by <span class="code">qlc</span>.</p>
</li>
</ul>
<p>The following example uses an explicit match specification
to traverse the table:</p>
<div class="example"><pre>
1> <span class="bold_code">dets:open_file(t, []),</span>
<span class="bold_code">ok = dets:insert(t, [{1,a},{2,b},{3,c},{4,d}]),</span>
<span class="bold_code">MS = ets:fun2ms(fun({X,Y}) when (X > 1) or (X < 5) -> {Y} end),</span>
<span class="bold_code">QH1 = dets:table(t, [{traverse, {select, MS}}]).</span> </pre></div>
<p>An example with implicit match specification:</p>
<div class="example"><pre>
2> <span class="bold_code">QH2 = qlc:q([{Y} || {X,Y} <- dets:table(t), (X > 1) or (X < 5)]).</span> </pre></div>
<p>The latter example is in fact equivalent to the former which
can be verified using the function <span class="code">qlc:info/1</span>:</p>
<div class="example"><pre>
3> <span class="bold_code">qlc:info(QH1) =:= qlc:info(QH2).</span>
true </pre></div>
<p><span class="code">qlc:info/1</span> returns information about a query handle,
and in this case identical information is returned for the
two query handles.</p>
</p></div>
<p><a name="to_ets-2"></a><span class="bold_code">to_ets(Name, EtsTab) -> EtsTab | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">EtsTab = <span class="bold_code"><a href="ets.html#type-tab">ets:tab()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Reason = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Inserts the objects of the Dets table <span class="code">Name</span> into the
Ets table <span class="code">EtsTab</span>. The order in which the objects are
inserted is not specified. The existing objects of the Ets
table are kept unless overwritten.</p>
</p></div>
<p><a name="traverse-2"></a><span class="bold_code">traverse(Name, Fun) -> Return | {error, Reason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Fun = fun((Object) -> FunReturn)</span></div>
<div class="REFTYPES"><span class="bold_code">Object = <span class="bold_code"><a href="#type-object">object()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">FunReturn = continue<br> | {continue, Val}<br> | {done, Value}<br> | OtherValue</span></div>
<div class="REFTYPES"><span class="bold_code">Return = [term()] | OtherValue</span></div>
<div class="REFTYPES"><span class="bold_code">Val = Value = OtherValue = Reason = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Applies <span class="code">Fun</span> to each object stored in the table
<span class="code">Name</span> in some unspecified order. Different actions are
taken depending on the return value of <span class="code">Fun</span>. The
following <span class="code">Fun</span> return values are allowed:</p>
<dl>
<dt><strong><span class="code">continue</span></strong></dt>
<dd>
<p>Continue to perform the traversal. For example, the
following function can be used to print out the contents
of a table:</p>
<div class="example"><pre>
fun(X) -> io:format("~p~n", [X]), continue end. </pre></div>
</dd>
<dt><strong><span class="code">{continue, Val}</span></strong></dt>
<dd>
<p>Continue the traversal and accumulate <span class="code">Val</span>. The
following function is supplied in order to collect all
objects of a table in a list: </p>
<div class="example"><pre>
fun(X) -> {continue, X} end. </pre></div>
</dd>
<dt><strong><span class="code">{done, Value}</span></strong></dt>
<dd>
<p>Terminate the traversal and return <span class="code">[Value | Acc]</span>.</p>
</dd>
</dl>
<p>Any other value <span class="code">OtherValue</span> returned by <span class="code">Fun</span> terminates the
traversal and is immediately returned.
</p>
</p></div>
<p><a name="update_counter-3"></a><span class="bold_code">update_counter(Name, Key, Increment) -> Result</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Name = <span class="bold_code"><a href="#type-tab_name">tab_name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Key = term()</span></div>
<div class="REFTYPES"><span class="bold_code">Increment = {Pos, Incr} | Incr</span></div>
<div class="REFTYPES"><span class="bold_code">Pos = Incr = Result = integer()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Updates the object with key <span class="code">Key</span> stored in the
table <span class="code">Name</span> of type <span class="code">set</span> by adding
<span class="code">Incr</span> to the
element at the <span class="code">Pos</span>:th position.
The new counter value
is returned. If no position is specified, the element directly
following the key is updated.</p>
<p>This functions provides a way of updating a counter,
without having to look up an object, update the object by
incrementing an element and insert the resulting object into
the table again.</p>
</p></div>
<h3><a name="id157258">See Also</a></h3>
<div class="REFBODY">
<p><span class="bold_code"><a href="ets.html">ets(3)</a></span>,
mnesia(3),
<span class="bold_code"><a href="qlc.html">qlc(3)</a></span></p>
</div>
</div>
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