diff options
Diffstat (limited to 'doc/html/qsqlfield.html')
| -rw-r--r-- | doc/html/qsqlfield.html | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/doc/html/qsqlfield.html b/doc/html/qsqlfield.html deleted file mode 100644 index fc2cdb2d..00000000 --- a/doc/html/qsqlfield.html +++ /dev/null @@ -1,216 +0,0 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> -<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/sql/qsqlfield.cpp:42 --> -<html> -<head> -<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> -<title>TQSqlField Class</title> -<style type="text/css"><!-- -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>TQSqlField Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1> - -<p>The TQSqlField class manipulates the fields in SQL database tables -and views. -<a href="#details">More...</a> -<p><tt>#include <<a href="qsqlfield-h.html">qsqlfield.h</a>></tt> -<p><a href="qsqlfield-members.html">List of all member functions.</a> -<h2>Public Members</h2> -<ul> -<li class=fn><a href="#TQSqlField"><b>TQSqlField</b></a> ( const TQString & fieldName = TQString::null, TQVariant::Type type = TQVariant::Invalid )</li> -<li class=fn><a href="#TQSqlField-2"><b>TQSqlField</b></a> ( const TQSqlField & other )</li> -<li class=fn>TQSqlField & <a href="#operator-eq"><b>operator=</b></a> ( const TQSqlField & other )</li> -<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const TQSqlField & other ) const</li> -<li class=fn>virtual <a href="#~TQSqlField"><b>~TQSqlField</b></a> ()</li> -<li class=fn>virtual void <a href="#setValue"><b>setValue</b></a> ( const TQVariant & value )</li> -<li class=fn>virtual TQVariant <a href="#value"><b>value</b></a> () const</li> -<li class=fn>virtual void <a href="#setName"><b>setName</b></a> ( const TQString & name )</li> -<li class=fn>TQString <a href="#name"><b>name</b></a> () const</li> -<li class=fn>virtual void <a href="#setNull"><b>setNull</b></a> ()</li> -<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li> -<li class=fn>virtual void <a href="#setReadOnly"><b>setReadOnly</b></a> ( bool readOnly )</li> -<li class=fn>bool <a href="#isReadOnly"><b>isReadOnly</b></a> () const</li> -<li class=fn>void <a href="#clear"><b>clear</b></a> ( bool nullify = TRUE )</li> -<li class=fn>TQVariant::Type <a href="#type"><b>type</b></a> () const</li> -</ul> -<hr><a name="details"></a><h2>Detailed Description</h2> - - -The TQSqlField class manipulates the fields in SQL database tables -and views. -<p> - -<p> TQSqlField represents the characteristics of a single column in a -database table or view, such as the data type and column name. A -field also contains the value of the database column, which can be -viewed or changed. -<p> Field data values are stored as TQVariants. Using an incompatible -type is not permitted. For example: -<p> <pre> - TQSqlField f( "myfield", TQVariant::Int ); - f.<a href="#setValue">setValue</a>( TQPixmap() ); // will not work - </pre> - -<p> However, the field will attempt to cast certain data types to the -field data type where possible: -<p> <pre> - TQSqlField f( "myfield", TQVariant::Int ); - f.<a href="#setValue">setValue</a>( TQString("123") ); // casts TQString to int - </pre> - -<p> TQSqlField objects are rarely created explicitly in application -code. They are usually accessed indirectly through <a href="qsqlrecord.html">TQSqlRecord</a> -or <a href="qsqlcursor.html">TQSqlCursor</a> which already contain a list of fields. For -example: -<p> <pre> - <a href="qsqlcursor.html">TQSqlCursor</a> cur( "Employee" ); // create cursor using the 'Employee' table - TQSqlField* f = cur.<a href="qsqlrecord.html#field">field</a>( "name" ); // use the 'name' field - f-><a href="#setValue">setValue</a>( "Dave" ); // set field value - ... - </pre> - -<p> In practice we rarely need to extract a pointer to a field at all. -The previous example would normally be written: -<p> <pre> - <a href="qsqlcursor.html">TQSqlCursor</a> cur( "Employee" ); - cur.<a href="qsqlrecord.html#setValue">setValue</a>( "name", "Dave" ); - ... - </pre> - -<p>See also <a href="database.html">Database Classes</a>. - -<hr><h2>Member Function Documentation</h2> -<h3 class=fn><a name="TQSqlField"></a>TQSqlField::TQSqlField ( const <a href="qstring.html">TQString</a> & fieldName = TQString::null, <a href="qvariant.html#Type-enum">TQVariant::Type</a> type = TQVariant::Invalid ) -</h3> -Constructs an empty field called <em>fieldName</em> of type <em>type</em>. - -<h3 class=fn><a name="TQSqlField-2"></a>TQSqlField::TQSqlField ( const <a href="qsqlfield.html">TQSqlField</a> & other ) -</h3> -Constructs a copy of <em>other</em>. - -<h3 class=fn><a name="~TQSqlField"></a>TQSqlField::~TQSqlField ()<tt> [virtual]</tt> -</h3> -Destroys the object and frees any allocated resources. - -<h3 class=fn>void <a name="clear"></a>TQSqlField::clear ( bool nullify = TRUE ) -</h3> -Clears the value of the field. If the field is read-only, nothing -happens. If <em>nullify</em> is TRUE (the default), the field is set to -NULL. - -<h3 class=fn>bool <a name="isNull"></a>TQSqlField::isNull () const -</h3> - -<p> Returns TRUE if the field is currently NULL; otherwise returns -FALSE. - -<h3 class=fn>bool <a name="isReadOnly"></a>TQSqlField::isReadOnly () const -</h3> - -<p> Returns TRUE if the field's value is read only; otherwise returns -FALSE. - -<h3 class=fn><a href="qstring.html">TQString</a> <a name="name"></a>TQSqlField::name () const -</h3> - -<p> Returns the name of the field. - -<p>Example: <a href="sql.html#x2249">sql/overview/table4/main.cpp</a>. -<h3 class=fn><a href="qsqlfield.html">TQSqlField</a> & <a name="operator-eq"></a>TQSqlField::operator= ( const <a href="qsqlfield.html">TQSqlField</a> & other ) -</h3> -Sets the field equal to <em>other</em>. - -<h3 class=fn>bool <a name="operator-eq-eq"></a>TQSqlField::operator== ( const <a href="qsqlfield.html">TQSqlField</a> & other ) const -</h3> -Returns TRUE if the field is equal to <em>other</em>; otherwise returns -FALSE. Fields are considered equal when the following field -properties are the same: -<p> <ul> -<li> <a href="#name">name</a>() -<li> <a href="#isNull">isNull</a>() -<li> <a href="#value">value</a>() -<li> <a href="#isReadOnly">isReadOnly</a>() -</ul> -<p> -<h3 class=fn>void <a name="setName"></a>TQSqlField::setName ( const <a href="qstring.html">TQString</a> & name )<tt> [virtual]</tt> -</h3> - -<p> Sets the name of the field to <em>name</em>. - -<h3 class=fn>void <a name="setNull"></a>TQSqlField::setNull ()<tt> [virtual]</tt> -</h3> - -<p> Sets the field to NULL and clears the value using <a href="#clear">clear</a>(). If the -field is read-only, nothing happens. -<p> <p>See also <a href="#isReadOnly">isReadOnly</a>() and <a href="#clear">clear</a>(). - -<h3 class=fn>void <a name="setReadOnly"></a>TQSqlField::setReadOnly ( bool readOnly )<tt> [virtual]</tt> -</h3> - -<p> Sets the read only flag of the field's value to <em>readOnly</em>. -<p> <p>See also <a href="#setValue">setValue</a>(). - -<h3 class=fn>void <a name="setValue"></a>TQSqlField::setValue ( const <a href="qvariant.html">TQVariant</a> & value )<tt> [virtual]</tt> -</h3> -Sets the value of the field to <em>value</em>. If the field is read-only -(<a href="#isReadOnly">isReadOnly</a>() returns TRUE), nothing happens. If the data type of -<em>value</em> differs from the field's current data type, an attempt is -made to cast it to the proper type. This preserves the data type -of the field in the case of assignment, e.g. a <a href="qstring.html">TQString</a> to an -integer data type. For example: -<p> <pre> - <a href="qsqlcursor.html">TQSqlCursor</a> cur( "Employee" ); // 'Employee' table - TQSqlField* f = cur.<a href="qsqlrecord.html#field">field</a>( "student_count" ); // an integer field - ... - f-><a href="#setValue">setValue</a>( myLineEdit->text() ); // cast the line edit text to an integer - </pre> - -<p> <p>See also <a href="#isReadOnly">isReadOnly</a>(). - -<h3 class=fn><a href="qvariant.html#Type-enum">TQVariant::Type</a> <a name="type"></a>TQSqlField::type () const -</h3> - -<p> Returns the field's type as stored in the database. -Note that the actual value might have a different type, -Numerical values that are too large to store in a long -int or double are usually stored as strings to prevent -precision loss. - -<h3 class=fn><a href="qvariant.html">TQVariant</a> <a name="value"></a>TQSqlField::value () const<tt> [virtual]</tt> -</h3> - -<p> Returns the value of the field as a <a href="qvariant.html">TQVariant</a>. - -<p>Example: <a href="sql.html#x2250">sql/overview/table4/main.cpp</a>. -<!-- eof --> -<hr><p> -This file is part of the <a href="index.html">TQt toolkit</a>. -Copyright © 1995-2007 -<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 © 2007 -<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> -<td align=right><div align=right>TQt 3.3.8</div> -</table></div></address></body> -</html> |