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  <title>QSqlRelation Class | Qt SQL 5.9</title>
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<td >Qt 5.9</td><td ><a href="qtsql-index.html">Qt SQL</a></td><td ><a href="qtsql-module.html">C++ Classes</a></td><td >QSqlRelation</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QSqlRelation Class</h1>
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<p>The <a href="qsqlrelation.html">QSqlRelation</a> class stores information about an SQL foreign key. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QSqlRelation&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += sql</td></tr></table></div><ul>
<li><a href="qsqlrelation-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qsqlrelation.html#QSqlRelation">QSqlRelation</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qsqlrelation.html#QSqlRelation-1">QSqlRelation</a></b>(const QString &amp;<i>tableName</i>, const QString &amp;<i>indexColumn</i>, const QString &amp;<i>displayColumn</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qsqlrelation.html#displayColumn">displayColumn</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qsqlrelation.html#indexColumn">indexColumn</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qsqlrelation.html#isValid">isValid</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsqlrelation.html#swap">swap</a></b>(QSqlRelation &amp;<i>other</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QString </td><td class="memItemRight bottomAlign"><b><a href="qsqlrelation.html#tableName">tableName</a></b>() const</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qsqlrelation.html">QSqlRelation</a> class stores information about an SQL foreign key.</p>
<p><a href="qsqlrelation.html">QSqlRelation</a> is a helper class for <a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a>. See <a href="qsqlrelationaltablemodel.html#setRelation">QSqlRelationalTableModel::setRelation</a>() and <a href="qsqlrelationaltablemodel.html#relation">QSqlRelationalTableModel::relation</a>() for details.</p>
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<p><b>See also </b><a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a>, <a href="qsqlrelationaldelegate.html">QSqlRelationalDelegate</a>, and <a href="qtsql-relationaltablemodel-example.html">Relational Table Model Example</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QSqlRelation"><a name="QSqlRelation"></a>QSqlRelation::<span class="name">QSqlRelation</span>()</h3>
<p>Constructs an invalid <a href="qsqlrelation.html">QSqlRelation</a> object.</p>
<p>For such an object, the <a href="qsqlrelation.html#tableName">tableName</a>(), <a href="qsqlrelation.html#indexColumn">indexColumn</a>(), and <a href="qsqlrelation.html#displayColumn">displayColumn</a>() functions return an empty string.</p>
<p><b>See also </b><a href="qsqlrelation.html#isValid">isValid</a>().</p>
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<h3 class="fn" id="QSqlRelation-1"><a name="QSqlRelation-1"></a>QSqlRelation::<span class="name">QSqlRelation</span>(const <span class="type"><a href="../qtcore/qstring.html">QString</a></span> &amp;<i>tableName</i>, const <span class="type"><a href="../qtcore/qstring.html">QString</a></span> &amp;<i>indexColumn</i>, const <span class="type"><a href="../qtcore/qstring.html">QString</a></span> &amp;<i>displayColumn</i>)</h3>
<p>Constructs a <a href="qsqlrelation.html">QSqlRelation</a> object, where <i>tableName</i> is the SQL table name to which a foreign key refers, <i>indexColumn</i> is the foreign key, and <i>displayColumn</i> is the field that should be presented to the user.</p>
<p><b>See also </b><a href="qsqlrelation.html#tableName">tableName</a>(), <a href="qsqlrelation.html#indexColumn">indexColumn</a>(), and <a href="qsqlrelation.html#displayColumn">displayColumn</a>().</p>
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<h3 class="fn" id="displayColumn"><a name="displayColumn"></a><span class="type"><a href="../qtcore/qstring.html">QString</a></span> QSqlRelation::<span class="name">displayColumn</span>() const</h3>
<p>Returns the column from table <a href="qsqlrelation.html#tableName">tableName</a>() that should be presented to the user instead of a foreign key.</p>
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<h3 class="fn" id="indexColumn"><a name="indexColumn"></a><span class="type"><a href="../qtcore/qstring.html">QString</a></span> QSqlRelation::<span class="name">indexColumn</span>() const</h3>
<p>Returns the index column from table <a href="qsqlrelation.html#tableName">tableName</a>() to which a foreign key refers.</p>
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<h3 class="fn" id="isValid"><a name="isValid"></a><span class="type">bool</span> QSqlRelation::<span class="name">isValid</span>() const</h3>
<p>Returns <code>true</code> if the <a href="qsqlrelation.html">QSqlRelation</a> object is valid; otherwise returns <code>false</code>.</p>
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<h3 class="fn" id="swap"><a name="swap"></a><span class="type">void</span> QSqlRelation::<span class="name">swap</span>(<span class="type"><a href="qsqlrelation.html#QSqlRelation">QSqlRelation</a></span> &amp;<i>other</i>)</h3>
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<h3 class="fn" id="tableName"><a name="tableName"></a><span class="type"><a href="../qtcore/qstring.html">QString</a></span> QSqlRelation::<span class="name">tableName</span>() const</h3>
<p>Returns the name of the table to which a foreign key refers.</p>
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