~oif-team/ubuntu/natty/qt4-x11/xi2.1

<td width="1">  </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="annotated.html"><font color="#004faf">Annotated</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td>

<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">QSqlRelation Class Reference</h1>

<p>The QSqlRelation class stores information about an SQL foreign key. <a href="#details">More...</a></p>

<pre>#include <QSqlRelation></pre><p>Part of the <a href="qtsql.html">QtSql</a> module.</p>

<ul>

<li><a href="qsqlrelation-members.html">List of all members, including inherited members</a></li>

</ul>

<h3>Public Functions</h3>

<ul>

<li><div class="fn"/><b><a href="qsqlrelation.html#QSqlRelation">QSqlRelation</a></b> ()</li>

<li><div class="fn"/><b><a href="qsqlrelation.html#QSqlRelation-2">QSqlRelation</a></b> ( const QString & <i>tableName</i>, const QString & <i>indexColumn</i>, const QString & <i>displayColumn</i> )</li>

<li><div class="fn"/>QString <b><a href="qsqlrelation.html#displayColumn">displayColumn</a></b> () const</li>

<li><div class="fn"/>QString <b><a href="qsqlrelation.html#indexColumn">indexColumn</a></b> () const</li>

<li><div class="fn"/>bool <b><a href="qsqlrelation.html#isValid">isValid</a></b> () const</li>

<li><div class="fn"/>QString <b><a href="qsqlrelation.html#tableName">tableName</a></b> () const</li>

</ul>

<hr />

<h2>Detailed Description</h2>

<p>The QSqlRelation class stores information about an SQL foreign key.</p>

<p>QSqlRelation 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>

<p>See also <a href="qsqlrelationaltablemodel.html">QSqlRelationalTableModel</a> and <a href="qsqlrelationaldelegate.html">QSqlRelationalDelegate</a>.</p>

<hr />

<h2>Member Function Documentation</h2>

<h3 class="fn"><a name="QSqlRelation"></a>QSqlRelation::QSqlRelation ()</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>See also <a href="qsqlrelation.html#isValid">isValid</a>().</p>

<h3 class="fn"><a name="QSqlRelation-2"></a>QSqlRelation::QSqlRelation ( const <a href="qstring.html">QString</a> & <i>tableName</i>, const <a href="qstring.html">QString</a> & <i>indexColumn</i>, const <a href="qstring.html">QString</a> & <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>See also <a href="qsqlrelation.html#tableName">tableName</a>(), <a href="qsqlrelation.html#indexColumn">indexColumn</a>(), and <a href="qsqlrelation.html#displayColumn">displayColumn</a>().</p>

<h3 class="fn"><a name="displayColumn"></a><a href="qstring.html">QString</a> QSqlRelation::displayColumn () 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>

<h3 class="fn"><a name="indexColumn"></a><a href="qstring.html">QString</a> QSqlRelation::indexColumn () const</h3>

<p>Returns the index column from table <a href="qsqlrelation.html#tableName">tableName</a>() to which a foreign key refers.</p>

<h3 class="fn"><a name="isValid"></a>bool QSqlRelation::isValid () const</h3>

<p>Returns true if the <a href="qsqlrelation.html">QSqlRelation</a> object is valid; otherwise returns false.</p>

<h3 class="fn"><a name="tableName"></a><a href="qstring.html">QString</a> QSqlRelation::tableName () const</h3>

<p>Returns the name of the table to which a foreign key refers.</p>

<td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td>

</tr></table></div></address></body>

</html>

Older »