<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <title>Wt: Wt::Dbo Namespace Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="doxygen.css" rel="stylesheet" type="text/css" /> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="search/search.js"></script> <script type="text/javascript"> $(document).ready(function() { searchBox.OnSelectItem(0); }); </script> </head> <body> <div id="top"><!-- do not remove this div! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">Wt  <span id="projectnumber">3.2.3</span> </div> </td> </tr> </tbody> </table> </div> <!-- Generated by Doxygen 1.7.5.1 --> <script type="text/javascript"> var searchBox = new SearchBox("searchBox", "search",false,'Search'); </script> <div id="navrow1" class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li class="current"><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="annotated.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li> <div id="MSearchBox" class="MSearchBoxInactive"> <span class="left"> <img id="MSearchSelect" src="search/mag_sel.png" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" alt=""/> <input type="text" id="MSearchField" value="Search" accesskey="S" onfocus="searchBox.OnSearchFieldFocus(true)" onblur="searchBox.OnSearchFieldFocus(false)" 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<p>Namespace for the <a class="el" href="group__dbo.html">Database Objects (Wt::Dbo)</a>. <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_1Call.html">Call</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">A database call. <a href="classWt_1_1Dbo_1_1Call.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">collection</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">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">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">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">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_1ForeignKeyConstraint.html">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">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1FixedSqlConnectionPool.html">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">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">dbo_traits</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">Dbo</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">ptr</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">A smart pointer for a database object. <a href="classWt_1_1Dbo_1_1ptr.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">ptr_tuple</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="structWt_1_1Dbo_1_1DirectBinding.html">DirectBinding</a></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_1DynamicBinding.html">DynamicBinding</a></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">Query</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">QueryModel</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">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">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">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="classWt_1_1Dbo_1_1SqlStatement.html">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="structWt_1_1Dbo_1_1sql__value__traits.html">sql_value_traits</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">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">query_result_traits</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">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 class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1Dbo_1_1weak__ptr.html">weak_ptr</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">A weak pointer for a database object. <a href="classWt_1_1Dbo_1_1weak__ptr.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">RelationType</a> { <a class="el" href="group__dbo.html#gga1d0ec6819b1bf5b7a88ad030b91ca564a32d7393c325724244671b18be53058fa">ManyToOne</a>, <a class="el" href="group__dbo.html#gga1d0ec6819b1bf5b7a88ad030b91ca564ad0bd477ec215a878e0758cce8494af24">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 class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="namespaceWt_1_1Dbo.html#af213c090c1ccddc36d70d56e0804047f">SqlDateTimeType</a> { <a class="el" href="namespaceWt_1_1Dbo.html#af213c090c1ccddc36d70d56e0804047fa4ab45fdabb649cdca45c41496f7b9d19">SqlDate</a>, <a class="el" href="namespaceWt_1_1Dbo.html#af213c090c1ccddc36d70d56e0804047fae8521662683cc300eeb403a9658f9a45">SqlDateTime</a>, <a class="el" href="namespaceWt_1_1Dbo.html#af213c090c1ccddc36d70d56e0804047fab8343042a993efa1c34f906c2e3c8bfd">SqlTime</a> }</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Enum that defines a date time type. <a href="namespaceWt_1_1Dbo.html#af213c090c1ccddc36d70d56e0804047f">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="Wt::Dbo::operator|" ref="ga3815c99266412f8ff53cf4c73546d918" args="(ForeignKeyConstraint lhs, ForeignKeyConstraint rhs)" --> <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga3815c99266412f8ff53cf4c73546d918">operator|</a> (<a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> lhs, <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> 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">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="group__dbo.html#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">id</a> (Action &action, <a class="el" href="classWt_1_1Dbo_1_1ptr.html">ptr</a>< C > &value, const std::string &name, <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> 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="group__dbo.html#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">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="group__dbo.html#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">belongsTo</a> (Action &action, <a class="el" href="classWt_1_1Dbo_1_1ptr.html">ptr</a>< 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 (foreign key) of a ManyToOne or OneToOne relation. <a href="group__dbo.html#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">belongsTo</a> (Action &action, <a class="el" href="classWt_1_1Dbo_1_1ptr.html">ptr</a>< C > &value, const std::string &name, <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> constraints, int size=-1)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "One"-side (foreign key) of a ManyToOne or OneToOne relation. <a href="group__dbo.html#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">belongsTo</a> (Action &action, <a class="el" href="classWt_1_1Dbo_1_1ptr.html">ptr</a>< C > &value, <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> constraints, int size=-1)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "One"-side (foreign key) of a ManyToOne or OneToOne relation. <a href="group__dbo.html#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#ga00a060d5f4764f673948989f21837548">hasOne</a> (Action &action, <a class="el" href="classWt_1_1Dbo_1_1weak__ptr.html">weak_ptr</a>< C > &value, const std::string &name=std::string())</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "One"-side of a OneToOne relation. <a href="group__dbo.html#ga00a060d5f4764f673948989f21837548"></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#ga570b71f937c991b000b9db01b327a363">hasMany</a> (Action &action, <a class="el" href="classWt_1_1Dbo_1_1collection.html">collection</a>< <a class="el" href="classWt_1_1Dbo_1_1ptr.html">ptr</a>< C > > &value, <a class="el" href="group__dbo.html#ga1d0ec6819b1bf5b7a88ad030b91ca564">RelationType</a> type, const std::string &name=std::string())</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "Many"-side of a ManyToOne or ManyToMany relation. <a href="group__dbo.html#ga570b71f937c991b000b9db01b327a363"></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#ga6daca8218568c4cc868821a22b292b67">hasMany</a> (Action &action, <a class="el" href="classWt_1_1Dbo_1_1collection.html">collection</a>< <a class="el" href="classWt_1_1Dbo_1_1ptr.html">ptr</a>< C > > &value, <a class="el" href="group__dbo.html#ga1d0ec6819b1bf5b7a88ad030b91ca564">RelationType</a> type, const std::string &name, const std::string &joinId, <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> constraints=<a class="el" href="group__dbo.html#ga538d2126ffe7787d14e72bfcdb266ff0">NotNull</a>)</td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">Maps the "Many"-side of a ManyToMany relation. <a href="group__dbo.html#ga6daca8218568c4cc868821a22b292b67"></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 <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga538d2126ffe7787d14e72bfcdb266ff0">NotNull</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that prevents a <code>null</code> ptr. <a href="group__dbo.html#ga538d2126ffe7787d14e72bfcdb266ff0"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga766c0992c040bee5b9b1f4dcfa18d11f">OnUpdateCascade</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that cascades updates. <a href="group__dbo.html#ga766c0992c040bee5b9b1f4dcfa18d11f"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#ga5d603e49ff5ce63182c5e5d07f08fb21">OnUpdateSetNull</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that cascades updates. <a href="group__dbo.html#ga5d603e49ff5ce63182c5e5d07f08fb21"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#gaf873ff817052bf26092f89ab7cf9866f">OnDeleteCascade</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that cascades deletes. <a href="group__dbo.html#gaf873ff817052bf26092f89ab7cf9866f"></a><br/></td></tr> <tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classWt_1_1Dbo_1_1ForeignKeyConstraint.html">ForeignKeyConstraint</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__dbo.html#gaed6ad23f771e2c07db12249e1f6af390">OnDeleteSetNull</a></td></tr> <tr><td class="mdescLeft"> </td><td class="mdescRight">A constraint that cascades deletes. <a href="group__dbo.html#gaed6ad23f771e2c07db12249e1f6af390"></a><br/></td></tr> </table> <hr/><a name="details" id="details"></a><h2>Detailed Description</h2> <div class="textblock"><p>Namespace for the <a class="el" href="group__dbo.html">Database Objects (Wt::Dbo)</a>. </p> </div><hr/><h2>Enumeration Type Documentation</h2> <a class="anchor" id="af213c090c1ccddc36d70d56e0804047f"></a><!-- doxytag: member="Wt::Dbo::SqlDateTimeType" ref="af213c090c1ccddc36d70d56e0804047f" args="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">enum <a class="el" href="namespaceWt_1_1Dbo.html#af213c090c1ccddc36d70d56e0804047f">Wt::Dbo::SqlDateTimeType</a></td> </tr> </table> </div> <div class="memdoc"> <p>Enum that defines a date time type. </p> <dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"><em><a class="anchor" id="af213c090c1ccddc36d70d56e0804047fa4ab45fdabb649cdca45c41496f7b9d19"></a><!-- doxytag: member="SqlDate" ref="af213c090c1ccddc36d70d56e0804047fa4ab45fdabb649cdca45c41496f7b9d19" args="" -->SqlDate</em> </td><td> <p>Date only. </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="af213c090c1ccddc36d70d56e0804047fae8521662683cc300eeb403a9658f9a45"></a><!-- doxytag: member="SqlDateTime" ref="af213c090c1ccddc36d70d56e0804047fae8521662683cc300eeb403a9658f9a45" args="" -->SqlDateTime</em> </td><td> <p>Date and time. </p> </td></tr> <tr><td valign="top"><em><a class="anchor" id="af213c090c1ccddc36d70d56e0804047fab8343042a993efa1c34f906c2e3c8bfd"></a><!-- doxytag: member="SqlTime" ref="af213c090c1ccddc36d70d56e0804047fab8343042a993efa1c34f906c2e3c8bfd" args="" -->SqlTime</em> </td><td> <p>Time duration. </p> </td></tr> </table> </dd> </dl> </div> </div> </div> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> <a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" 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