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<div class="section" id="compliance-to-python-database-api-2-0">
<h1>Compliance to Python Database API 2.0<a class="headerlink" href="#compliance-to-python-database-api-2-0" title="Permalink to this headline">¶</a></h1>
<div class="section" id="incompatibilities">
<h2>Incompatibilities<a class="headerlink" href="#incompatibilities" title="Permalink to this headline">¶</a></h2>
<dl class="data">
<dt id="kinterbasdb.DATETIME">
<!--[kinterbasdb.DATETIME]--><tt class="descclassname">kinterbasdb.</tt><tt class="descname">DATETIME</tt><a class="headerlink" href="#kinterbasdb.DATETIME" title="Permalink to this definition">¶</a></dt>
<dd>KInterbasDB’s deferred loading of dynamic type translators causes
this singleton to behave in violation of the standard until the
<a title="kinterbasdb.init" class="reference external" href="beyond-python-db-api.html#kinterbasdb.init"><tt class="xref docutils literal"><span class="pre">kinterbasdb.init()</span></tt></a> function has been called (whether explicitly or
implicitly). For more information, see the documnation section about
<cite>Deferred Loading of Dynamic Type Translators</cite>.</dd></dl>
</div>
<div class="section" id="unsupported-optional-features">
<h2>Unsupported Optional Features<a class="headerlink" href="#unsupported-optional-features" title="Permalink to this headline">¶</a></h2>
<dl class="method">
<dt id="kinterbasdb.Cursor.nextset">
<!--[kinterbasdb.Cursor.nextset]--><tt class="descclassname">Cursor.</tt><tt class="descname">nextset</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.nextset" title="Permalink to this definition">¶</a></dt>
<dd>This method is not implemented because the database engine does not support
opening multiple result sets simultaneously with a single cursor.</dd></dl>
</div>
<div class="section" id="nominally-supported-optional-features">
<h2>Nominally Supported Optional Features<a class="headerlink" href="#nominally-supported-optional-features" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="kinterbasdb.Cursor">
<!--[kinterbasdb.Cursor]-->class <tt class="descclassname">kinterbasdb.</tt><tt class="descname">Cursor</tt><a class="headerlink" href="#kinterbasdb.Cursor" title="Permalink to this definition">¶</a></dt>
<dd><dl class="attribute">
<dt id="kinterbasdb.Cursor.arraysize">
<!--[kinterbasdb.Cursor.arraysize]--><tt class="descname">arraysize</tt><a class="headerlink" href="#kinterbasdb.Cursor.arraysize" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<p>As required by the spec, the value of this attribute is observed with
respect to the <cite>fetchmany</cite> method. However, changing the value of this
attribute does not make any difference in fetch efficiency because
the database engine only supports fetching a single row at a time.</p>
<dl class="method">
<dt id="kinterbasdb.Cursor.setinputsizes">
<!--[kinterbasdb.Cursor.setinputsizes]--><tt class="descname">setinputsizes</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.setinputsizes" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<p>Although this method is present, it does nothing, as allowed by the spec.</p>
<dl class="method">
<dt id="kinterbasdb.Cursor.setoutputsize">
<!--[kinterbasdb.Cursor.setoutputsize]--><tt class="descname">setoutputsize</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.setoutputsize" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<p>Although this method is present, it does nothing, as allowed by the spec.</p>
</dd></dl>
</div>
<div class="section" id="extensions-and-caveats">
<h2>Extensions and Caveats<a class="headerlink" href="#extensions-and-caveats" title="Permalink to this headline">¶</a></h2>
<p>KInterbasDB offers a large feature set beyond the minimal requirements
of the Python DB API. Most of these extensions are documented in the
section of this document entitled <cite>Native Database Engine Features and
Extensions Beyond the Python DB API</cite>.</p>
<p>This section attempts to document only those features that overlap
with the DB API, or are too insignificant to warrant their own
subsection elsewhere.</p>
<dl class="function">
<dt id="kinterbasdb.connect">
<!--[kinterbasdb.connect]--><tt class="descclassname">kinterbasdb.</tt><tt class="descname">connect</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.connect" title="Permalink to this definition">¶</a></dt>
<dd><p>This function supports the following optional keyword arguments in addition
to those required by the spec:</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Role:</th><td class="field-body">For connecting to a database with a specific SQL role.</td>
</tr>
</tbody>
</table>
<p><em>Example:</em></p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">kinterbasdb</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">dsn</span><span class="o">=</span><span class="s">'host:/path/database.db'</span><span class="p">,</span> <span class="n">user</span><span class="o">=</span><span class="s">'limited_user'</span><span class="p">,</span>
<span class="n">password</span><span class="o">=</span><span class="s">'pass'</span><span class="p">,</span> <span class="n">role</span><span class="o">=</span><span class="s">'MORE_POWERFUL_ROLE'</span><span class="p">)</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Charset:</th><td class="field-body">For explicitly specifying the character set of the connection.
See Firebird Documentation for a list of available character sets, and
<cite>Unicode Fields and KInterbasDB</cite> section for information on handling
extended character sets with KInterbasDB.</td>
</tr>
</tbody>
</table>
<p><em>Example:</em></p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">kinterbasdb</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">dsn</span><span class="o">=</span><span class="s">'host:/path/database.db'</span><span class="p">,</span> <span class="n">user</span><span class="o">=</span><span class="s">'sysdba'</span><span class="p">,</span>
<span class="n">password</span><span class="o">=</span><span class="s">'pass'</span><span class="p">,</span> <span class="n">charset</span><span class="o">=</span><span class="s">'UTF8'</span><span class="p">)</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Dialect:</th><td class="field-body">The SQL dialect is feature for backward compatibility with Interbase® 5.5
or earlier. The default dialect is <cite>3</cite> (the most featureful dialect, default
for Firebird). If you want to connect to <cite>legacy</cite> databases, you must
explicitly set this argument’s value to <cite>1</cite>. Dialect <cite>2</cite> is a transitional
dialect that is normally used only during ports from IB < 6 to IB >= 6
or Firebird. See Firebird documentation for more information about
SQL Dialects.</td>
</tr>
</tbody>
</table>
<p><em>Example:</em></p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">kinterbasdb</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">dsn</span><span class="o">=</span><span class="s">'host:/path/database.db'</span><span class="p">,</span> <span class="n">user</span><span class="o">=</span><span class="s">'sysdba'</span><span class="p">,</span>
<span class="n">password</span><span class="o">=</span><span class="s">'pass'</span><span class="p">,</span> <span class="n">dialect</span><span class="o">=</span><span class="mf">1</span><span class="p">)</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Timeout:</th><td class="field-body">(<cite>Optional</cite>) Dictionary with timeout and action specification. See section
about <a class="reference external" href="beyond-python-db-api.html#connection-timeout">Connection Timeouts</a> for details.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="class">
<dt id="kinterbasdb.Connection">
<!--[kinterbasdb.Connection]-->class <tt class="descclassname">kinterbasdb.</tt><tt class="descname">Connection</tt><a class="headerlink" href="#kinterbasdb.Connection" title="Permalink to this definition">¶</a></dt>
<dd><dl class="attribute">
<dt id="kinterbasdb.Connection.charset">
<!--[kinterbasdb.Connection.charset]--><tt class="descname">charset</tt><a class="headerlink" href="#kinterbasdb.Connection.charset" title="Permalink to this definition">¶</a></dt>
<dd><em>(read-only)</em> The character set of the connection (set via the <cite>charset</cite>
parameter of <a title="kinterbasdb.connect" class="reference internal" href="#kinterbasdb.connect"><tt class="xref docutils literal"><span class="pre">kinterbasdb.connect()</span></tt></a>). See Firebird Documentation for a list
of available character sets, and <cite>Unicode Fields and KInterbasDB</cite> section
for information on handling extended character sets with KInterbasDB.</dd></dl>
<dl class="attribute">
<dt id="kinterbasdb.Connection.dialect">
<!--[kinterbasdb.Connection.dialect]--><tt class="descname">dialect</tt><a class="headerlink" href="#kinterbasdb.Connection.dialect" title="Permalink to this definition">¶</a></dt>
<dd>This integer attribute indicates which SQL dialect the connection is using.
You should not change a connection’s dialect; instead, discard the connection
and establish a new one with the desired dialect. For more information, see
the documentation of the <cite>dialect</cite> argument of the <cite>connect</cite> function.</dd></dl>
<dl class="attribute">
<dt id="kinterbasdb.Connection.server_version">
<!--[kinterbasdb.Connection.server_version]--><tt class="descname">server_version</tt><a class="headerlink" href="#kinterbasdb.Connection.server_version" title="Permalink to this definition">¶</a></dt>
<dd><em>(read-only)</em> The version string of the database server to which this connection
is connected. For example, a connection to Firebird 1.0 on Windows has the following
<cite>server_version</cite>: <cite>WI-V6.2.794 Firebird 1.0</cite></dd></dl>
<dl class="method">
<dt id="kinterbasdb.Connection.execute_immediate">
<!--[kinterbasdb.Connection.execute_immediate]--><tt class="descname">execute_immediate</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Connection.execute_immediate" title="Permalink to this definition">¶</a></dt>
<dd><p>Executes a statement without caching its prepared form. The statement must <em>not</em> be
of a type that returns a result set. In most cases (especially cases in which the same
statement – perhaps a parameterized statement – is executed repeatedly),
it is better to create a cursor using the connection’s <cite>cursor</cite> method, then execute
the statement using one of the cursor’s execute methods.</p>
<p>Arguments:</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Sql:</th><td class="field-body">String containing the SQL statement to execute.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="attribute">
<dt id="kinterbasdb.Connection.precision_mode">
<!--[kinterbasdb.Connection.precision_mode]--><tt class="descname">precision_mode</tt><a class="headerlink" href="#kinterbasdb.Connection.precision_mode" title="Permalink to this definition">¶</a></dt>
<dd>Although this attribute is present in KInterbasDB 3.1+ and works in a backward-compatible
fashion, it is deprecated in favor of the more general dynamic type translation feature.</dd></dl>
<dl class="method">
<dt id="kinterbasdb.Connection.commit">
<!--[kinterbasdb.Connection.commit]--><tt class="descname">commit</tt><big>(</big><em>retaining=False</em><big>)</big><a class="headerlink" href="#kinterbasdb.Connection.commit" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="kinterbasdb.Connection.rollback">
<!--[kinterbasdb.Connection.rollback]--><tt class="descname">rollback</tt><big>(</big><em>retaining=False</em><big>)</big><a class="headerlink" href="#kinterbasdb.Connection.rollback" title="Permalink to this definition">¶</a></dt>
<dd>The <cite>commit</cite> and <cite>rollback</cite> methods accept an optional boolean parameter <cite>retaining</cite>
(default <cite>False</cite>) that indicates whether the transactional context of the transaction
being resolved should be recycled. For details, see the Advanced
Transaction Control: Retaining Operations section of this document.
The <cite>rollback</cite> method accepts an optional string parameter <cite>savepoint</cite>
that causes the transaction to roll back only as far as the designated
savepoint, rather than rolling back entirely. For details, see the
Advanced Transaction Control: Savepoints section of this document.</dd></dl>
</dd></dl>
<dl class="class">
<dt>
class <tt class="descclassname">kinterbasdb.</tt><tt class="descname">Cursor</tt></dt>
<dd><dl class="attribute">
<dt id="kinterbasdb.Cursor.description">
<!--[kinterbasdb.Cursor.description]--><tt class="descname">description</tt><a class="headerlink" href="#kinterbasdb.Cursor.description" title="Permalink to this definition">¶</a></dt>
<dd><p>KInterbasDB makes absolutely no guarantees about <cite>description</cite> except those
required by the Python Database API Specification 2.0 (that is, <cite>description</cite>
is either <cite>None</cite> or a sequence of 7-element sequences). Therefore, client
programmers should <em>not</em> rely on <cite>description</cite> being an instance of a particular
class or type. KInterbasDB provides several named positional constants to be
used as indices into a given element of <cite>description</cite> . The contents
of all <cite>description</cite> elements are defined by the DB API spec; these
constants are provided merely for convenience.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">DESCRIPTION_NAME</span>
<span class="n">DESCRIPTION_TYPE_CODE</span>
<span class="n">DESCRIPTION_DISPLAY_SIZE</span>
<span class="n">DESCRIPTION_INTERNAL_SIZE</span>
<span class="n">DESCRIPTION_PRECISION</span>
<span class="n">DESCRIPTION_SCALE</span>
<span class="n">DESCRIPTION_NULL_OK</span>
</pre></div>
</div>
<p>Here is an example of accessing the <em>name</em> of the first field in the
<cite>description</cite> of cursor <cite>cur</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">nameOfFirstField</span> <span class="o">=</span> <span class="n">cur</span><span class="o">.</span><span class="n">description</span><span class="p">[</span><span class="mf">0</span><span class="p">][</span><span class="n">kinterbasdb</span><span class="o">.</span><span class="n">DESCRIPTION_NAME</span><span class="p">]</span>
</pre></div>
</div>
<p>For more information, see the documentation of Cursor.description in
the <a class="reference external" href="Python-DB-API-2.0.html">DB API Specification</a>.</p>
</dd></dl>
<dl class="attribute">
<dt id="kinterbasdb.Cursor.rowcount">
<!--[kinterbasdb.Cursor.rowcount]--><tt class="descname">rowcount</tt><a class="headerlink" href="#kinterbasdb.Cursor.rowcount" title="Permalink to this definition">¶</a></dt>
<dd>Although KInterbasDB’s <cite>Cursor`s implement this
attribute, the database engine’s own support for the determination of
“rows affected”/”rows selected” is quirky. The database engine only
supports the determination of rowcount for `INSERT</cite>, <cite>UPDATE</cite>,
<cite>DELETE</cite>, and <cite>SELECT</cite> statements. When stored procedures become
involved, row count figures are usually not available to the client.
Determining rowcount for <cite>SELECT</cite> statements is problematic: the
rowcount is reported as zero until at least one row has been fetched
from the result set, and the rowcount is misreported if the result set
is larger than 1302 rows. The server apparently marshals result sets
internally in batches of 1302, and will misreport the rowcount for
result sets larger than 1302 rows until the 1303rd row is fetched,
result sets larger than 2604 rows until the 2605th row is fetched, and
so on, in increments of 1302. As required by the Python DB API Spec,
the rowcount attribute “is -1 in case no executeXX() has been
performed on the cursor or the rowcount of the last operation is not
determinable by the interface”.</dd></dl>
<dl class="method">
<dt id="kinterbasdb.Cursor.fetchone">
<!--[kinterbasdb.Cursor.fetchone]--><tt class="descname">fetchone</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.fetchone" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="kinterbasdb.Cursor.fetchmany">
<!--[kinterbasdb.Cursor.fetchmany]--><tt class="descname">fetchmany</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.fetchmany" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="kinterbasdb.Cursor.fetchall">
<!--[kinterbasdb.Cursor.fetchall]--><tt class="descname">fetchall</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.fetchall" title="Permalink to this definition">¶</a></dt>
<dd>KInterbasDB makes absolutely no guarantees about
the return value of the <cite>fetchone</cite> / <cite>fetchmany</cite> / <cite>fetchall</cite> methods
except that it is a sequence indexed by field position. KInterbasDB
makes absolutely no guarantees about the return value of the
<cite>fetchonemap</cite> / <cite>fetchmanymap</cite> / <cite>fetchallmap</cite> methods (documented
below) except that it is a mapping of field name to field value.
Therefore, client programmers should <em>not</em> rely on the return value
being an instance of a particular class or type.</dd></dl>
<dl class="method">
<dt id="kinterbasdb.Cursor.fetchonemap">
<!--[kinterbasdb.Cursor.fetchonemap]--><tt class="descname">fetchonemap</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.fetchonemap" title="Permalink to this definition">¶</a></dt>
<dd>This method is just like the standard
<cite>fetchone</cite> method of the DB API, except that it returns a mapping of
field name to field value, rather than a sequence.</dd></dl>
<dl class="method">
<dt id="kinterbasdb.Cursor.fetchmanymap">
<!--[kinterbasdb.Cursor.fetchmanymap]--><tt class="descname">fetchmanymap</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.fetchmanymap" title="Permalink to this definition">¶</a></dt>
<dd>This method is just like the standard
<cite>fetchmany</cite> method of the DB API, except that it returns a sequence of
mappings of field name to field value, rather than a sequence of
sequences.</dd></dl>
<dl class="method">
<dt id="kinterbasdb.Cursor.fetchallmap">
<!--[kinterbasdb.Cursor.fetchallmap]--><tt class="descname">fetchallmap</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.fetchallmap" title="Permalink to this definition">¶</a></dt>
<dd>This method is just like the standard
<cite>fetchall</cite> method of the DB API, except that it returns a sequence of
mappings of field name to field value, rather than a sequence of
sequences.</dd></dl>
<dl class="method">
<dt id="kinterbasdb.Cursor.iter">
<!--[kinterbasdb.Cursor.iter]--><tt class="descname">iter</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.iter" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="kinterbasdb.Cursor.itermap">
<!--[kinterbasdb.Cursor.itermap]--><tt class="descname">itermap</tt><big>(</big><big>)</big><a class="headerlink" href="#kinterbasdb.Cursor.itermap" title="Permalink to this definition">¶</a></dt>
<dd>These methods are equivalent to the
<cite>fetchall</cite> and <cite>fetchallmap</cite> methods, respectively, except that they
return iterators rather than materialized sequences. <cite>iter</cite> and
<cite>itermap</cite> are exercised in this example.</dd></dl>
</dd></dl>
</div>
</div>
</div>
</div>
</div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference external" href="">Compliance to Python Database API 2.0</a><ul>
<li><a class="reference external" href="#incompatibilities">Incompatibilities</a></li>
<li><a class="reference external" href="#unsupported-optional-features">Unsupported Optional Features</a></li>
<li><a class="reference external" href="#nominally-supported-optional-features">Nominally Supported Optional Features</a></li>
<li><a class="reference external" href="#extensions-and-caveats">Extensions and Caveats</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="Python-DB-API-2.0.html" title="previous chapter">Python Database API Specification 2.0</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="beyond-python-db-api.html" title="next chapter">Native Database Engine Features and Extensions Beyond the Python DB API</a></p>
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