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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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 <span id="projectnumber">3.2.1</span>
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<div class="title">Database Objects (Wt::Dbo)</div> </div>
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<p>An implemenation of an Object Relational Mapping layer.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">Wt::Dbo::ForeignKeyConstraint</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Type that indicates one or more foreign key constraints. <a href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1ptr__tuple.html">Wt::Dbo::ptr_tuple< T0, T1,, T9 ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A utility class for defining a tuple of database objects. <a href="structWt_1_1Dbo_1_1ptr__tuple.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1SqlStatement.html">Wt::Dbo::SqlStatement</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Abstract base class for a prepared SQL statement. <a href="classWt_1_1Dbo_1_1SqlStatement.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1backend_1_1Firebird.html">Wt::Dbo::backend::Firebird</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A Firebird connection. <a href="classWt_1_1Dbo_1_1backend_1_1Firebird.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1backend_1_1Postgres.html">Wt::Dbo::backend::Postgres</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A PostgreSQL connection. <a href="classWt_1_1Dbo_1_1backend_1_1Postgres.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1backend_1_1Sqlite3.html">Wt::Dbo::backend::Sqlite3</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">An SQLite3 connection. <a href="classWt_1_1Dbo_1_1backend_1_1Sqlite3.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1collection.html">Wt::Dbo::collection< C ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">An STL container for iterating query results. <a href="classWt_1_1Dbo_1_1collection.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1Exception.html">Wt::Dbo::Exception</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Exception base class for Wt::Dbo. <a href="classWt_1_1Dbo_1_1Exception.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1StaleObjectException.html">Wt::Dbo::StaleObjectException</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Exception thrown when Wt::Dbo detects a concurrent modification <a href="classWt_1_1Dbo_1_1StaleObjectException.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1ObjectNotFoundException.html">Wt::Dbo::ObjectNotFoundException</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Exception thrown when trying to load a non-existing object. <a href="classWt_1_1Dbo_1_1ObjectNotFoundException.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1NoUniqueResultException.html">Wt::Dbo::NoUniqueResultException</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Exception thrown when a query unexpectedly finds a non-unique result. <a href="classWt_1_1Dbo_1_1NoUniqueResultException.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1FixedSqlConnectionPool.html">Wt::Dbo::FixedSqlConnectionPool</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A connection pool of fixed size. <a href="classWt_1_1Dbo_1_1FixedSqlConnectionPool.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1dbo__default__traits.html">Wt::Dbo::dbo_default_traits</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Default traits for a class mapped with Wt::Dbo. <a href="structWt_1_1Dbo_1_1dbo__default__traits.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1dbo__traits.html">Wt::Dbo::dbo_traits< C ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Traits for a class mapped with Wt::Dbo. <a href="structWt_1_1Dbo_1_1dbo__traits.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1Dbo.html">Wt::Dbo::Dbo< C ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A base class for database objects. <a href="classWt_1_1Dbo_1_1Dbo.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1ptr.html">Wt::Dbo::ptr< C ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A smart pointer for database objects. <a href="classWt_1_1Dbo_1_1ptr.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1Query.html">Wt::Dbo::Query< Result, BindStrategy ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A database query. <a href="classWt_1_1Dbo_1_1Query.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1QueryModel.html">Wt::Dbo::QueryModel< Result ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A Wt MVC Model to view/edit query results. <a href="classWt_1_1Dbo_1_1QueryModel.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1Session.html">Wt::Dbo::Session</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A database session. <a href="classWt_1_1Dbo_1_1Session.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1SqlConnection.html">Wt::Dbo::SqlConnection</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Abstract base class for an SQL connection. <a href="classWt_1_1Dbo_1_1SqlConnection.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1SqlConnectionPool.html">Wt::Dbo::SqlConnectionPool</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Abstract base class for a SQL connection pool. <a href="classWt_1_1Dbo_1_1SqlConnectionPool.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html">Wt::Dbo::sql_value_traits< V, Enable ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Traits class for value types. <a href="structWt_1_1Dbo_1_1sql__value__traits.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1FieldInfo.html">Wt::Dbo::FieldInfo</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Description of a field. <a href="classWt_1_1Dbo_1_1FieldInfo.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="structWt_1_1Dbo_1_1query__result__traits.html">Wt::Dbo::query_result_traits< Result ></a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Traits class for result types. <a href="structWt_1_1Dbo_1_1query__result__traits.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1Transaction.html">Wt::Dbo::Transaction</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A database transaction. <a href="classWt_1_1Dbo_1_1Transaction.html#details">More...</a><br/></td></tr>
<tr><td colspan="2"><h2><a name="enum-members"></a>
Enumerations</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga1d0ec6819b1bf5b7a88ad030b91ca564">Wt::Dbo::RelationType</a> { <a class="el" href="group__dbo.html#gga1d0ec6819b1bf5b7a88ad030b91ca564a32d7393c325724244671b18be53058fa">Wt::Dbo::ManyToOne</a>,
<a class="el" href="group__dbo.html#gga1d0ec6819b1bf5b7a88ad030b91ca564ad0bd477ec215a878e0758cce8494af24">Wt::Dbo::ManyToMany</a>
}</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Type of an SQL relation. <a href="group__dbo.html#ga1d0ec6819b1bf5b7a88ad030b91ca564">More...</a><br/></td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ga3815c99266412f8ff53cf4c73546d918"></a><!-- doxytag: member="dbo::operator|" ref="ga3815c99266412f8ff53cf4c73546d918" args="(ForeignKeyConstraint lhs, ForeignKeyConstraint rhs)" -->
ForeignKeyConstraint </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga3815c99266412f8ff53cf4c73546d918">Wt::Dbo::operator|</a> (ForeignKeyConstraint lhs, ForeignKeyConstraint rhs)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Combines two constraints. <br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class Action , typename V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga42c50bd3bfc38ad8c810b30b279b0ba6">Wt::Dbo::id</a> (Action &action, V &value, const std::string &name="id", int size=-1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Maps a natural primary key (id) field. <a href="#ga42c50bd3bfc38ad8c810b30b279b0ba6"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class Action , class C > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__dbo.html#gaf6e683b7a7124e562134caf155ef0080">Wt::Dbo::id</a> (Action &action, ptr< C > &value, const std::string &name, ForeignKeyConstraint constraints, int size=-1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Maps a natural primary key (id) field that is a foreign key. <a href="#gaf6e683b7a7124e562134caf155ef0080"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class Action , typename V > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga864a2e134149e7f614f45967777992c7">Wt::Dbo::field</a> (Action &action, V &value, const std::string &name, int size=-1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Maps a database object field. <a href="#ga864a2e134149e7f614f45967777992c7"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class Action , class C > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__dbo.html#gaa3de862f9544c4d30b8cbcac4b50feba">Wt::Dbo::belongsTo</a> (Action &action, ptr< C > &value, const std::string &name=std::string(), int size=-1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "One"-side of a ManyToOne relation. <a href="#gaa3de862f9544c4d30b8cbcac4b50feba"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class Action , class C > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga63aeb211ec8096a9f7acd3964de0eaed">Wt::Dbo::belongsTo</a> (Action &action, ptr< C > &value, const std::string &name, ForeignKeyConstraint constraints, int size=-1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "One"-side of a ManyToOne relation. <a href="#ga63aeb211ec8096a9f7acd3964de0eaed"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class Action , class C > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__dbo.html#gab5e93ae896ad21f7c8eda8c36c2161f9">Wt::Dbo::belongsTo</a> (Action &action, ptr< C > &value, ForeignKeyConstraint constraints, int size=-1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "One"-side of a ManyToOne relation. <a href="#gab5e93ae896ad21f7c8eda8c36c2161f9"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class Action , class C > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58">Wt::Dbo::hasMany</a> (Action &action, collection< ptr< C > > &value, RelationType type, const std::string &joinName=std::string())</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "Many"-side of a ManyToOne or ManyToMany relation. <a href="#ga34bf1703d4464997a261460acb2f2c58"></a><br/></td></tr>
<tr><td class="memTemplParams" colspan="2">template<class Action , class C > </td></tr>
<tr><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga4ca8214ebae3710c44837a32407767a7">Wt::Dbo::hasMany</a> (Action &action, collection< ptr< C > > &value, RelationType type, const std::string &joinName, const std::string &joinId, ForeignKeyConstraint constraints=NotNull)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "Many"-side of a ManyToMany relation. <a href="#ga4ca8214ebae3710c44837a32407767a7"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="var-members"></a>
Variables</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const ForeignKeyConstraint </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga538d2126ffe7787d14e72bfcdb266ff0">Wt::Dbo::NotNull</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that prevents a <code>null</code> ptr. <a href="#ga538d2126ffe7787d14e72bfcdb266ff0"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const ForeignKeyConstraint </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga766c0992c040bee5b9b1f4dcfa18d11f">Wt::Dbo::OnUpdateCascade</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that cascades updates. <a href="#ga766c0992c040bee5b9b1f4dcfa18d11f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const ForeignKeyConstraint </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga5d603e49ff5ce63182c5e5d07f08fb21">Wt::Dbo::OnUpdateSetNull</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that cascades updates. <a href="#ga5d603e49ff5ce63182c5e5d07f08fb21"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const ForeignKeyConstraint </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#gaf873ff817052bf26092f89ab7cf9866f">Wt::Dbo::OnDeleteCascade</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that cascades deletes. <a href="#gaf873ff817052bf26092f89ab7cf9866f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const ForeignKeyConstraint </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#gaed6ad23f771e2c07db12249e1f6af390">Wt::Dbo::OnDeleteSetNull</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that cascades deletes. <a href="#gaed6ad23f771e2c07db12249e1f6af390"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<p>An implemenation of an Object Relational Mapping layer. </p>
<p>For an introduction, see the <a href="../../tutorial/dbo.html">tutorial</a>. </p>
<hr/><h2>Enumeration Type Documentation</h2>
<a class="anchor" id="ga1d0ec6819b1bf5b7a88ad030b91ca564"></a><!-- doxytag: member="Wt::Dbo::RelationType" ref="ga1d0ec6819b1bf5b7a88ad030b91ca564" args="" -->
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<td class="memname">enum <a class="el" href="group__dbo.html#ga1d0ec6819b1bf5b7a88ad030b91ca564">Wt::Dbo::RelationType</a></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Type of an SQL relation. </p>
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="gga1d0ec6819b1bf5b7a88ad030b91ca564a32d7393c325724244671b18be53058fa"></a><!-- doxytag: member="ManyToOne" ref="gga1d0ec6819b1bf5b7a88ad030b91ca564a32d7393c325724244671b18be53058fa" args="" -->ManyToOne</em> </td><td>
<p>Many-to-One relationship. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga1d0ec6819b1bf5b7a88ad030b91ca564ad0bd477ec215a878e0758cce8494af24"></a><!-- doxytag: member="ManyToMany" ref="gga1d0ec6819b1bf5b7a88ad030b91ca564ad0bd477ec215a878e0758cce8494af24" args="" -->ManyToMany</em> </td><td>
<p>Many-to-Many relationship. </p>
</td></tr>
</table>
</dd>
</dl>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="gaa3de862f9544c4d30b8cbcac4b50feba"></a><!-- doxytag: member="Wt::Dbo::belongsTo" ref="gaa3de862f9544c4d30b8cbcac4b50feba" args="(Action &action, ptr< C > &value, const std::string &name=std::string(), int size=-1)" -->
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<div class="memtemplate">
template<class Action , class C > </div>
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<td class="memname">void Wt::Dbo::belongsTo </td>
<td>(</td>
<td class="paramtype">Action & </td>
<td class="paramname"><em>action</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">ptr< C > & </td>
<td class="paramname"><em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>name</em> = <code>std::string()</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em> = <code>-1</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<div class="memdoc">
<p>Maps the "One"-side of a ManyToOne relation. </p>
<p>This function binds the pointer field <code>value</code> to the database field(s) <code>name</code> <code>+ "_" +</code> (C's primary key(s)).</p>
<p>If the name is omitted (or empty), then C's mapped table name is used.</p>
<p>A <a class="el" href="group__dbo.html#gaa3de862f9544c4d30b8cbcac4b50feba" title="Maps the "One"-side of a ManyToOne relation.">belongsTo()</a> will usually have a counter-part <a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> declaration in the referenced class <code>C</code>.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ga63aeb211ec8096a9f7acd3964de0eaed"></a><!-- doxytag: member="Wt::Dbo::belongsTo" ref="ga63aeb211ec8096a9f7acd3964de0eaed" args="(Action &action, ptr< C > &value, const std::string &name, ForeignKeyConstraint constraints, int size=-1)" -->
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<div class="memtemplate">
template<class Action , class C > </div>
<table class="memname">
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<td class="memname">void Wt::Dbo::belongsTo </td>
<td>(</td>
<td class="paramtype">Action & </td>
<td class="paramname"><em>action</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">ptr< C > & </td>
<td class="paramname"><em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>name</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">ForeignKeyConstraint </td>
<td class="paramname"><em>constraints</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em> = <code>-1</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Maps the "One"-side of a ManyToOne relation. </p>
<p>This overloaded method allows to specify constraints for the foreign key.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="gab5e93ae896ad21f7c8eda8c36c2161f9"></a><!-- doxytag: member="Wt::Dbo::belongsTo" ref="gab5e93ae896ad21f7c8eda8c36c2161f9" args="(Action &action, ptr< C > &value, ForeignKeyConstraint constraints, int size=-1)" -->
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<div class="memtemplate">
template<class Action , class C > </div>
<table class="memname">
<tr>
<td class="memname">void Wt::Dbo::belongsTo </td>
<td>(</td>
<td class="paramtype">Action & </td>
<td class="paramname"><em>action</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">ptr< C > & </td>
<td class="paramname"><em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">ForeignKeyConstraint </td>
<td class="paramname"><em>constraints</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em> = <code>-1</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Maps the "One"-side of a ManyToOne relation. </p>
<p>This overloaded method allows to specify constraints for the foreign key.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ga864a2e134149e7f614f45967777992c7"></a><!-- doxytag: member="Wt::Dbo::field" ref="ga864a2e134149e7f614f45967777992c7" args="(Action &action, V &value, const std::string &name, int size=-1)" -->
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template<class Action , typename V > </div>
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<td class="memname">void Wt::Dbo::field </td>
<td>(</td>
<td class="paramtype">Action & </td>
<td class="paramname"><em>action</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">V & </td>
<td class="paramname"><em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>name</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>size</em> = <code>-1</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
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<div class="memdoc">
<p>Maps a database object field. </p>
<p>This function binds the field <code>value</code> to the database field <code>name</code>.</p>
<p>The optional <code>size</code> may be used as a hint for the needed storage. It is only useful for <em>std::string</em> or <em><a class="el" href="classWt_1_1WString.html" title="A value class which describes a locale-aware unicode string.">Wt::WString</a></em> fields, and causes the schema to use a <code>varchar(</code><em><code>size</code></em><code>)</code> for storing the field instead of an unlimited length string type.</p>
<p>You may want to specialize this method for a particular composite type which should be persisted in multiple database fields but not as a separate table (e.g. for natural composite primary keys, see <a class="el" href="group__dbo.html#ga42c50bd3bfc38ad8c810b30b279b0ba6" title="Maps a natural primary key (id) field.">id()</a>).</p>
<p>For example: </p>
<div class="fragment"><pre class="fragment"> <span class="keyword">struct </span>Coordinate {
<span class="keywordtype">int</span> x, y;
};
<span class="keyword">namespace </span>Wt {
<span class="keyword">namespace </span>Dbo {
<span class="keyword">template</span> <<span class="keyword">class</span> Action>
<span class="keywordtype">void</span> <a class="code" href="group__dbo.html#ga864a2e134149e7f614f45967777992c7" title="Maps a database object field.">field</a>(Action& action, Coordinate& coordinate, <span class="keyword">const</span> std::string& name, <span class="keywordtype">int</span> size = -1)
{
<a class="code" href="group__dbo.html#ga864a2e134149e7f614f45967777992c7" title="Maps a database object field.">field</a>(action, coordinate.x, name + <span class="stringliteral">"_x"</span>);
<a class="code" href="group__dbo.html#ga864a2e134149e7f614f45967777992c7" title="Maps a database object field.">field</a>(action, coordinate.y, name + <span class="stringliteral">"_y"</span>);
}
} <span class="comment">// namespace Dbo</span>
} <span class="comment">// namespace Wt</span>
</pre></div><p>To support a custom type that needs to be persisted as a single field, you should specialize <a class="el" href="structWt_1_1Dbo_1_1sql__value__traits.html" title="Traits class for value types.">sql_value_traits</a> instead. </p>
</div>
</div>
<a class="anchor" id="ga34bf1703d4464997a261460acb2f2c58"></a><!-- doxytag: member="Wt::Dbo::hasMany" ref="ga34bf1703d4464997a261460acb2f2c58" args="(Action &action, collection< ptr< C > > &value, RelationType type, const std::string &joinName=std::string())" -->
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template<class Action , class C > </div>
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<td class="memname">void Wt::Dbo::hasMany </td>
<td>(</td>
<td class="paramtype">Action & </td>
<td class="paramname"><em>action</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">collection< ptr< C > > & </td>
<td class="paramname"><em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">RelationType </td>
<td class="paramname"><em>type</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>joinName</em> = <code>std::string()</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Maps the "Many"-side of a ManyToOne or ManyToMany relation. </p>
<p>This function binds the collection field <code>value</code> to contain objects (of type <code>C</code>).</p>
<p>For a <a class="el" href="group__dbo.html#gga1d0ec6819b1bf5b7a88ad030b91ca564a32d7393c325724244671b18be53058fa">ManyToOne</a> relation, the query is defined by the database field(s) <code>joinName</code> <code>+ "_" + </code> (C's primary key(s)), in the mapped table for C. This should be the same <em>name</em> as passed to the matching <a class="el" href="group__dbo.html#gaa3de862f9544c4d30b8cbcac4b50feba" title="Maps the "One"-side of a ManyToOne relation.">belongsTo()</a> method for the other side of the relation. If the joinName is omitted (or empty), then C's mapped table name is used.</p>
<p>For a <a class="el" href="group__dbo.html#gga1d0ec6819b1bf5b7a88ad030b91ca564ad0bd477ec215a878e0758cce8494af24">ManyToMany</a> relation, the <code>joinName</code> is the name of a linker table (this linker table may be schema qualified, e.g. <code>"myschema.posts_tags"</code>. Thus, also for a ManyToMany relation, both sides of the relationship will have the same joinName passed to them. In the join table, this side of the the relation will be referenced using the table name <code>+ "_" + </code> (primary key(s)) of the current class.</p>
<p>A <a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> must have a counter-part <a class="el" href="group__dbo.html#gaa3de862f9544c4d30b8cbcac4b50feba" title="Maps the "One"-side of a ManyToOne relation.">belongsTo()</a> or <a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> declaration in the referenced class <code>C</code>.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="group__dbo.html#gaa3de862f9544c4d30b8cbcac4b50feba" title="Maps the "One"-side of a ManyToOne relation.">belongsTo()</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ga4ca8214ebae3710c44837a32407767a7"></a><!-- doxytag: member="Wt::Dbo::hasMany" ref="ga4ca8214ebae3710c44837a32407767a7" args="(Action &action, collection< ptr< C > > &value, RelationType type, const std::string &joinName, const std::string &joinId, ForeignKeyConstraint constraints=NotNull)" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template<class Action , class C > </div>
<table class="memname">
<tr>
<td class="memname">void Wt::Dbo::hasMany </td>
<td>(</td>
<td class="paramtype">Action & </td>
<td class="paramname"><em>action</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">collection< ptr< C > > & </td>
<td class="paramname"><em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">RelationType </td>
<td class="paramname"><em>type</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>joinName</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>joinId</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">ForeignKeyConstraint </td>
<td class="paramname"><em>constraints</em> = <code>NotNull</code> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Maps the "Many"-side of a ManyToMany relation. </p>
<p>This function binds the collection field <code>value</code> to contain objects (of type <code>C</code>).</p>
<p>This overloaded method allows to customize the field name of the foreign id in the join table, and specify constraints for this foreign key. The only allowed value for <code>type</code> is <a class="el" href="group__dbo.html#gga1d0ec6819b1bf5b7a88ad030b91ca564ad0bd477ec215a878e0758cce8494af24">ManyToMany</a>.</p>
<p>The <code>joinId</code> is used to reference this side of the relationship in the join table. If <code>joinId</code> is left blank, the value will be table name <code>+ "_" +</code> (primary key(s)) of the current class.</p>
<p>A <a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> must have a counter-part <a class="el" href="group__dbo.html#gaa3de862f9544c4d30b8cbcac4b50feba" title="Maps the "One"-side of a ManyToOne relation.">belongsTo()</a> or <a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> declaration in the referenced class <code>C</code>.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="group__dbo.html#gaa3de862f9544c4d30b8cbcac4b50feba" title="Maps the "One"-side of a ManyToOne relation.">belongsTo()</a> </dd></dl>
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<p>Maps a natural primary key (id) field. </p>
<p>A natural primary key field is optional. If you define one and its type is not <code>long long</code>, you must specialize <a class="el" href="structWt_1_1Dbo_1_1dbo__traits.html" title="Traits for a class mapped with Wt::Dbo.">Wt::Dbo::dbo_traits</a> to match the type <code>V</code> as the IdType for this class. When not specified for a class, an auto-generated surrogate key field is used with the name specified by <a class="el" href="structWt_1_1Dbo_1_1dbo__traits.html#a44c5455df89390fae082aadf7cf1bc13" title="Configures the surrogate primary key field.">Wt::Dbo::dbo_traits::surrogateIdField()</a>, which defaults to "id".</p>
<p>Unlike the default surrogate key, a natural id is not auto-generated and thus you need to give each object a unique value when creating a new object.</p>
<p>The id may be a composite type. In that case, you need to specialize <a class="el" href="group__dbo.html#ga864a2e134149e7f614f45967777992c7" title="Maps a database object field.">Wt::Dbo::field()</a>. </p>
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<p>Maps a natural primary key (id) field that is a foreign key. </p>
<p>This overloaded method allows to specify constraints for the foreign key.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="group__dbo.html#ga34bf1703d4464997a261460acb2f2c58" title="Maps the "Many"-side of a ManyToOne or ManyToMany relation.">hasMany()</a> </dd></dl>
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<hr/><h2>Variable Documentation</h2>
<a class="anchor" id="ga538d2126ffe7787d14e72bfcdb266ff0"></a><!-- doxytag: member="Wt::Dbo::NotNull" ref="ga538d2126ffe7787d14e72bfcdb266ff0" args="" -->
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<td class="memname">const ForeignKeyConstraint <a class="el" href="group__dbo.html#ga538d2126ffe7787d14e72bfcdb266ff0">Wt::Dbo::NotNull</a></td>
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<p>A constraint that prevents a <code>null</code> ptr. </p>
<p>A database constraint which prevents that a ptr references no object and has a value of <code>null</code>. </p>
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<td class="memname">const ForeignKeyConstraint <a class="el" href="group__dbo.html#gaf873ff817052bf26092f89ab7cf9866f">Wt::Dbo::OnDeleteCascade</a></td>
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<p>A constraint that cascades deletes. </p>
<p>A database constraint which propagates deletes of the referenced object to also delete the object(s) that reference it.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>This constraint only affects the database schema creation. </dd></dl>
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<a class="anchor" id="gaed6ad23f771e2c07db12249e1f6af390"></a><!-- doxytag: member="Wt::Dbo::OnDeleteSetNull" ref="gaed6ad23f771e2c07db12249e1f6af390" args="" -->
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<td class="memname">const ForeignKeyConstraint <a class="el" href="group__dbo.html#gaed6ad23f771e2c07db12249e1f6af390">Wt::Dbo::OnDeleteSetNull</a></td>
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<p>A constraint that cascades deletes. </p>
<p>A database constraint which propagates deletes of the referenced object to also delete the objects that reference.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>This constraint only affects the database schema creation. </dd></dl>
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<a class="anchor" id="ga766c0992c040bee5b9b1f4dcfa18d11f"></a><!-- doxytag: member="Wt::Dbo::OnUpdateCascade" ref="ga766c0992c040bee5b9b1f4dcfa18d11f" args="" -->
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<td class="memname">const ForeignKeyConstraint <a class="el" href="group__dbo.html#ga766c0992c040bee5b9b1f4dcfa18d11f">Wt::Dbo::OnUpdateCascade</a></td>
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<p>A constraint that cascades updates. </p>
<p>A database constraint which propagates updates to the natural primary key in the referenced table.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>This constraint only affects the database schema creation. Currently it is not possible to update a natural Id of an already saved object through Dbo itself. </dd></dl>
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<a class="anchor" id="ga5d603e49ff5ce63182c5e5d07f08fb21"></a><!-- doxytag: member="Wt::Dbo::OnUpdateSetNull" ref="ga5d603e49ff5ce63182c5e5d07f08fb21" args="" -->
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<td class="memname">const ForeignKeyConstraint <a class="el" href="group__dbo.html#ga5d603e49ff5ce63182c5e5d07f08fb21">Wt::Dbo::OnUpdateSetNull</a></td>
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<p>A constraint that cascades updates. </p>
<p>A database constraint which sets the value of the ptr to null when the referenced primary key changes.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>This constraint only affects the database schema creation. Currently it is not possible to update a natural Id of an already saved object through Dbo itself. </dd></dl>
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