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<h1>ObjectClass Configuration</h1>
<p>ObjectClass/IObjectClass provides an
interface for class configuration. </p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>IObjectClass oc =
Db4oFactory.Configure().ObjectClass(clazz);</code></p>
</span>
<p>clazz parameter here can be one of
the following:</p>
<ul>
<li>a fully qualified classname as a
String.</li>
<li>a Class object.</li>
<li>any other object to be used as a
template.</li>
</ul>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
CallConstructor(bool flag);</code></p>
</span>
<p>advises db4o to try instantiating
objects of this class with/without calling constructors. For more information
see <a href="../../object_lifecycle/object_construction.html" class="wikiLink">Object Construction</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
CascadeOnActivate(bool flag);</code></p>
</span>
<p>sets cascaded activation behavior for
this class. For more information see <a href="../../object_lifecycle/activation.html" class="wikiLink">Activation</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
CascadeOnDelete(bool flag);</code></p>
</span>
<p>sets cascaded delete behavior for
this class. For more information see <a href="../../object_lifecycle/delete_behavior.html" class="wikiLink">Delete Behavior</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
CascadeOnUpdate(bool flag);</code></p>
</span>
<p>sets cascaded update behavior for
this class. For more information see <a href="../../object_lifecycle/update_depth.html" class="wikiLink">Update Depth</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
Compare(IObjectAttribute attributeProvider);</code></p>
</span>
<p>registers an attribute provider for
special query behavior. </p>
<p>The query processor will compare the
object returned by the attribute provider instead of the actual object, both
for the constraint and the candidate persistent object. For more information see <a href="../../object_lifecycle/querying/custom_query_comparator.html" class="wikiLink">Custom Query Comparator</a>.<br></p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
EnableReplication(bool setting);</code></p>
</span>
<p>enable replication of the specified
class. Must be called before databases are created or opened so that db4o will
control versions and generate UUIDs for objects of this class, which is
required for using replication. For more information see <a href="../../db4o_replication_system_drs.html" class="wikiLink">db4o Replication System (dRS)</a><br></p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void GenerateUUIDs(bool
setting);</code></p>
</span>
<p>generate UUIDs for stored objects of
this class. For more information see
<a href="../../implementation_strategies/ids_and_uuids/unique_universal_ids.html" class="wikiLink">Unique Universal IDs</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void GenerateVersionNumbers(bool
setting);</code></p>
</span>
<p>generate version numbers for stored
objects of this class. For more information see <a href="../../db4o_replication_system_drs.html" class="wikiLink">db4o Replication System (dRS)</a> </p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void Indexed(bool
flag);</code></p>
</span>
<p>turns the class index on or off.</p>
<p>db4o maintains an index for each
class to be able to deliver all instances of a class in a query. If the class
index is never needed, it can be turned off with this method to improve the
performance on creation and deletion of the class objects.</p>
<p>Common cases where a class index is
not needed:</p>
<ul>
<li>The application always works with
subclasses or superclasses.</li>
<li>There are convenient field indexes
that will always find instances of a class.</li>
<li>The application always works with
IDs. </li>
</ul>
<p>For more information see <a href="../performance_hints/no_class_index.html" class="wikiLink">No Class Index</a>.<br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
MaximumActivationDepth (int depth);</code></p>
</span>
<p>sets the maximum activation depth for
this class to the desired value. For more information see
<a href="../../object_lifecycle/activation.html" class="wikiLink">Activation</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
MinimumActivationDepth (int depth);</code></p>
</span>
<p>sets the minimum activation depth to
the desired value. For more information see
<a href="../../object_lifecycle/activation.html" class="wikiLink">Activation</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public IObjectField OjectField
(string fieldName);</code></p>
</span>
<p>returns an ObjectField object to
configure the specified field. For more information see
<a href="objectfield_configuration.html" class="wikiLink">ObjectField Configuration</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
PersistStaticFieldValues();</code></p>
</span>
<p>turns on storing static field values
for this class. For more information see
<a href="../../implementation_strategies/type_handling/static_fields_and_enums.html" class="wikiLink">Static Fields And Enums</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void ReadAs(object
clazz);</code></p>
</span>
<p>creates a temporary mapping of a
persistent class to a different class.</p>
<p>If the meta-information for this
ObjectClass has been stored to the database file, it will be read from the
database file as if it was representing the class specified by the clazz
parameter passed to this method. </p>
<p>The clazz parameter can be any of the
following:</p>
<ul>
<li>a fully qualified classname as a
String.</li>
<li>a Class object.</li>
<li>any other object to be used as a
template.</li>
</ul>
<p>This method will be ignored if the
database file already contains meta-information for clazz.</p>
<p>This method is deprecated, use <a href="../../implementation_strategies/aliases.html" class="wikiLink">Aliases</a> instead.<br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void Rename (string
newName);</code></p>
</span>
<p>renames a stored class. For more
information see
<a href="../../implementation_strategies/refactoring_and_schema_evolution.html" class="wikiLink">Refactoring and Schema Evolution</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void
StoreTransientFields (bool flag);</code></p>
</span>
<p>allows to specify if transient fields
are to be stored. The default for every class is <code>false</code>.</p>
<p>For more information see <a href="../selective_persistence/storing_transient_fields.html" class="wikiLink">Storing Transient Fields</a>. </p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void Translate
(IObjectTranslator translator);</code></p>
</span>
<p>registers a translator for this
class. For more information see <a href="../../implementation_strategies/translators.html" class="wikiLink">Translators</a>.</p>
<p><br></p>
<span name="cs_wiki_filter" csw_filters="net">
<p>.NET:</p>
<p><code>public void UpdateDepth (int
depth);</code></p>
</span>
<p>specifies the updateDepth for this
class. For more information see <a href="../../object_lifecycle/update_depth.html" class="wikiLink">Update Depth</a>.</p></div>
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This revision (10) was last Modified 2008-04-14T16:32:18 by Tetyana.
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