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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/sql/qsqlindex.cpp:43 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QSqlIndex Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td 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="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QSqlIndex Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1><p>The QSqlIndex class provides functions to manipulate anddescribe QSqlCursor and QSqlDatabase indexes.<a href="#details">More...</a><p><tt>#include <<a href="qsqlindex-h.html">qsqlindex.h</a>></tt><p>Inherits <a href="qsqlrecord.html">QSqlRecord</a>.<p><a href="qsqlindex-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn><a href="#QSqlIndex"><b>QSqlIndex</b></a> ( const QString & cursorname = QString::null, const QString & name = QString::null )</div></li><li><div class=fn><a href="#QSqlIndex-2"><b>QSqlIndex</b></a> ( const QSqlIndex & other )</div></li><li><div class=fn><a href="#~QSqlIndex"><b>~QSqlIndex</b></a> ()</div></li><li><div class=fn>QSqlIndex & <a href="#operator-eq"><b>operator=</b></a> ( const QSqlIndex & other )</div></li><li><div class=fn>virtual void <a href="#setCursorName"><b>setCursorName</b></a> ( const QString & cursorName )</div></li><li><div class=fn>QString <a href="#cursorName"><b>cursorName</b></a> () const</div></li><li><div class=fn>virtual void <a href="#setName"><b>setName</b></a> ( const QString & name )</div></li><li><div class=fn>QString <a href="#name"><b>name</b></a> () const</div></li><li><div class=fn>virtual void <a href="#append"><b>append</b></a> ( const QSqlField & field )</div></li><li><div class=fn>virtual void <a href="#append-2"><b>append</b></a> ( const QSqlField & field, bool desc )</div></li><li><div class=fn>bool <a href="#isDescending"><b>isDescending</b></a> ( int i ) const</div></li><li><div class=fn>virtual void <a href="#setDescending"><b>setDescending</b></a> ( int i, bool desc )</div></li></ul><h2>Static Public Members</h2><ul><li><div class=fn>QSqlIndex <a href="#fromStringList"><b>fromStringList</b></a> ( const QStringList & l, const QSqlCursor * cursor )</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2><p> The QSqlIndex class provides functions to manipulate anddescribe <a href="qsqlcursor.html">QSqlCursor</a> and <a href="qsqldatabase.html">QSqlDatabase</a> indexes.<p> <p> This class is used to describe and manipulate QSqlCursor andQSqlDatabase indexes. An index refers to a single table or view ina database. Information about the fields that comprise the indexcan be used to generate SQL statements, or to affect the behaviorof a <a href="qsqlcursor.html">QSqlCursor</a> object.<p> Normally, QSqlIndex objects are created by <a href="qsqldatabase.html">QSqlDatabase</a> orQSqlCursor.<p> <p>See also <a href="database.html">Database Classes</a>.<hr><h2>Member Function Documentation</h2><h3 class=fn><a name="QSqlIndex"></a>QSqlIndex::QSqlIndex ( const <a href="qstring.html">QString</a> & cursorname = QString::null, const <a href="qstring.html">QString</a> & name = QString::null )</h3> Constructs an empty index using the cursor name <em>cursorname</em> andindex name <em>name</em>.<p> <h3 class=fn><a name="QSqlIndex-2"></a>QSqlIndex::QSqlIndex ( const <a href="qsqlindex.html">QSqlIndex</a> & other )</h3> Constructs a copy of <em>other</em>.<p> <h3 class=fn><a name="~QSqlIndex"></a>QSqlIndex::~QSqlIndex ()</h3> Destroys the object and frees any allocated resources.<p> <h3 class=fn>void <a name="append"></a>QSqlIndex::append ( const <a href="qsqlfield.html">QSqlField</a> & field )<tt> [virtual]</tt></h3> Appends the field <em>field</em> to the list of indexed fields. Thefield is appended with an ascending sort order.<p> <p>Reimplemented from <a href="qsqlrecord.html#append">QSqlRecord</a>.<h3 class=fn>void <a name="append-2"></a>QSqlIndex::append ( const <a href="qsqlfield.html">QSqlField</a> & field, bool desc )<tt> [virtual]</tt></h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.<p> Appends the field <em>field</em> to the list of indexed fields. Thefield is appended with an ascending sort order, unless <em>desc</em> is TRUE.<p> <h3 class=fn><a href="qstring.html">QString</a> <a name="cursorName"></a>QSqlIndex::cursorName () const</h3> <p> Returns the name of the cursor which the index is associated with.<h3 class=fn><a href="qsqlindex.html">QSqlIndex</a> <a name="fromStringList"></a>QSqlIndex::fromStringList ( const <a href="qstringlist.html">QStringList</a> & l, const <a href="qsqlcursor.html">QSqlCursor</a> * cursor )<tt> [static]</tt></h3> Returns an index based on the field descriptions in <em>l</em> and thecursor <em>cursor</em>. The field descriptions should be in the same formatthat <a href="qsqlrecord.html#toStringList">toStringList</a>() produces, for example, a surname field in thepeople table might be in one of these forms: "surname", "surnameDESC" or "people.surname ASC".<p> <p>See also <a href="qsqlrecord.html#toStringList">toStringList</a>().<p> <h3 class=fn>bool <a name="isDescending"></a>QSqlIndex::isDescending ( int i ) const</h3> Returns true if field <em>i</em> in the index is sorted in descendingorder, otherwise returns FALSE.<p> <h3 class=fn><a href="qstring.html">QString</a> <a name="name"></a>QSqlIndex::name () const</h3> <p> Returns the name of the index.<h3 class=fn><a href="qsqlindex.html">QSqlIndex</a> & <a name="operator-eq"></a>QSqlIndex::operator= ( const <a href="qsqlindex.html">QSqlIndex</a> & other )</h3> Sets the index equal to <em>other</em>.<h3 class=fn>void <a name="setCursorName"></a>QSqlIndex::setCursorName ( const <a href="qstring.html">QString</a> & cursorName )<tt> [virtual]</tt></h3> Sets the name of the cursor that the index is associated with to<em>cursorName</em>.<h3 class=fn>void <a name="setDescending"></a>QSqlIndex::setDescending ( int i, bool desc )<tt> [virtual]</tt></h3> If <em>desc</em> is TRUE, field <em>i</em> is sorted in descending order.Otherwise, field <em>i</em> is sorted in ascending order (the default).If the field does not exist, nothing happens.<p> <h3 class=fn>void <a name="setName"></a>QSqlIndex::setName ( const <a href="qstring.html">QString</a> & name )<tt> [virtual]</tt></h3> Sets the name of the index to <em>name</em>.<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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