1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
<!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/tqsqlform.cpp:61 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>TQSqlForm 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>TQSqlForm Class Reference<br><small>[<a href="sql.html">sql module</a>]</small></h1>
<p>The TQSqlForm class creates and manages data entry forms
tied to SQL databases.
<a href="#details">More...</a>
<p><tt>#include <<a href="tqsqlform-h.html">tqsqlform.h</a>></tt>
<p>Inherits <a href="tqobject.html">TQObject</a>.
<p><a href="tqsqlform-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#TQSqlForm"><b>TQSqlForm</b></a> ( TQObject * parent = 0, const char * name = 0 )</li>
<li class=fn><a href="#~TQSqlForm"><b>~TQSqlForm</b></a> ()</li>
<li class=fn>virtual void <a href="#insert"><b>insert</b></a> ( TQWidget * widget, const TQString & field )</li>
<li class=fn>virtual void <a href="#remove-2"><b>remove</b></a> ( const TQString & field )</li>
<li class=fn>uint <a href="#count"><b>count</b></a> () const</li>
<li class=fn>TQWidget * <a href="#widget"><b>widget</b></a> ( uint i ) const</li>
<li class=fn>TQSqlField * <a href="#widgetToField"><b>widgetToField</b></a> ( TQWidget * widget ) const</li>
<li class=fn>TQWidget * <a href="#fieldToWidget"><b>fieldToWidget</b></a> ( TQSqlField * field ) const</li>
<li class=fn>void <a href="#installPropertyMap"><b>installPropertyMap</b></a> ( TQSqlPropertyMap * pmap )</li>
<li class=fn>virtual void <a href="#setRecord"><b>setRecord</b></a> ( TQSqlRecord * buf )</li>
</ul>
<h2>Public Slots</h2>
<ul>
<li class=fn>virtual void <a href="#readField"><b>readField</b></a> ( TQWidget * widget )</li>
<li class=fn>virtual void <a href="#writeField"><b>writeField</b></a> ( TQWidget * widget )</li>
<li class=fn>virtual void <a href="#readFields"><b>readFields</b></a> ()</li>
<li class=fn>virtual void <a href="#writeFields"><b>writeFields</b></a> ()</li>
<li class=fn>virtual void <a href="#clear"><b>clear</b></a> ()</li>
<li class=fn>virtual void <a href="#clearValues"><b>clearValues</b></a> ( bool nullify = FALSE )</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn>virtual void <a href="#insert-2"><b>insert</b></a> ( TQWidget * widget, TQSqlField * field )</li>
<li class=fn>virtual void <a href="#remove"><b>remove</b></a> ( TQWidget * widget )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The TQSqlForm class creates and manages data entry forms
tied to SQL databases.
<p>
<p> Typical use of a TQSqlForm consists of the following steps:
<ul>
<li> Create the widgets you want to appear in the form.
<li> Create a cursor and navigate to the record to be edited.
<li> Create the TQSqlForm.
<li> Set the form's record buffer to the cursor's update buffer.
<li> Insert each widget and the field it is to edit into the form.
<li> Use <a href="#readFields">readFields</a>() to update the editor widgets with values from
the database's fields.
<li> Display the form and let the user edit values etc.
<li> Use <a href="#writeFields">writeFields</a>() to update the database's field values with
the values in the editor widgets.
</ul>
<p> Note that a TQSqlForm does not access the database directly, but
most often via TQSqlFields which are part of a <a href="tqsqlcursor.html">TQSqlCursor</a>. A
<a href="tqsqlcursor.html#insert">TQSqlCursor::insert</a>(), <a href="tqsqlcursor.html#update">TQSqlCursor::update</a>() or <a href="tqsqlcursor.html#del">TQSqlCursor::del</a>()
call is needed to actually write values to the database.
<p> Some sample code to initialize a form successfully:
<p> <pre>
<a href="tqlineedit.html">TQLineEdit</a> myEditor( this );
TQSqlForm myForm( this );
<a href="tqsqlcursor.html">TQSqlCursor</a> myCursor( "mytable" );
// Execute a query to make the cursor valid
myCursor.<a href="tqsqlcursor.html#select">select</a>();
// Move the cursor to a valid record (the first record)
myCursor.<a href="tqsqlquery.html#next">next</a>();
// Set the form's record pointer to the cursor's edit buffer (which
// contains the current record's values)
myForm.<a href="#setRecord">setRecord</a>( myCursor.<a href="tqsqlcursor.html#primeUpdate">primeUpdate</a>() );
// Insert a field into the form that uses myEditor to edit the
// field 'somefield' in 'mytable'
myForm.<a href="#insert">insert</a>( &myEditor, "somefield" );
// Update myEditor with the value from the mapped database field
myForm.<a href="#readFields">readFields</a>();
...
// Let the user edit the form
...
// Update the database
myForm.<a href="#writeFields">writeFields</a>(); // Update the cursor's edit buffer from the form
myCursor.<a href="tqsqlcursor.html#update">update</a>(); // Update the database from the cursor's buffer
</pre>
<p> If you want to use custom editors for displaying and editing data
fields, you must install a custom <a href="tqsqlpropertymap.html">TQSqlPropertyMap</a>. The form
uses this object to get or set the value of a widget.
<p> Note that <a href="designer-manual.html">TQt Designer</a> provides
a visual means of creating data-aware forms.
<p> <p>See also <a href="#installPropertyMap">installPropertyMap</a>(), <a href="tqsqlpropertymap.html">TQSqlPropertyMap</a>, and <a href="database.html">Database Classes</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="TQSqlForm"></a>TQSqlForm::TQSqlForm ( <a href="tqobject.html">TQObject</a> * parent = 0, const char * name = 0 )
</h3>
Constructs a TQSqlForm with parent <em>parent</em> and called <em>name</em>.
<h3 class=fn><a name="~TQSqlForm"></a>TQSqlForm::~TQSqlForm ()
</h3>
Destroys the object and frees any allocated resources.
<h3 class=fn>void <a name="clear"></a>TQSqlForm::clear ()<tt> [virtual slot]</tt>
</h3>
Removes every widget, and the fields they're mapped to, from the form.
<h3 class=fn>void <a name="clearValues"></a>TQSqlForm::clearValues ( bool nullify = FALSE )<tt> [virtual slot]</tt>
</h3>
Clears the values in all the widgets, and the fields they are
mapped to, in the form. If <em>nullify</em> is TRUE (the default is
FALSE), each field is also set to NULL.
<h3 class=fn>uint <a name="count"></a>TQSqlForm::count () const
</h3>
Returns the number of widgets in the form.
<h3 class=fn><a href="tqwidget.html">TQWidget</a> * <a name="fieldToWidget"></a>TQSqlForm::fieldToWidget ( <a href="tqsqlfield.html">TQSqlField</a> * field ) const
</h3>
Returns the widget that field <em>field</em> is mapped to.
<h3 class=fn>void <a name="insert"></a>TQSqlForm::insert ( <a href="tqwidget.html">TQWidget</a> * widget, const <a href="tqstring.html">TQString</a> & field )<tt> [virtual]</tt>
</h3>
Inserts a <em>widget</em>, and the name of the <em>field</em> it is to be
mapped to, into the form. To actually associate inserted widgets
with an edit buffer, use <a href="#setRecord">setRecord</a>().
<p> <p>See also <a href="#setRecord">setRecord</a>().
<p>Examples: <a href="sql.html#x2225">sql/overview/form1/main.cpp</a> and <a href="sql.html#x2231">sql/overview/form2/main.cpp</a>.
<h3 class=fn>void <a name="insert-2"></a>TQSqlForm::insert ( <a href="tqwidget.html">TQWidget</a> * widget, <a href="tqsqlfield.html">TQSqlField</a> * field )<tt> [virtual protected]</tt>
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Inserts a <em>widget</em>, and the <em>field</em> it is to be mapped to, into
the form.
<h3 class=fn>void <a name="installPropertyMap"></a>TQSqlForm::installPropertyMap ( <a href="tqsqlpropertymap.html">TQSqlPropertyMap</a> * pmap )
</h3>
Installs a custom <a href="tqsqlpropertymap.html">TQSqlPropertyMap</a>. This is useful if you plan to
create your own custom editor widgets.
<p> TQSqlForm takes ownership of <em>pmap</em>, so <em>pmap</em> is deleted when
TQSqlForm goes out of scope.
<p> <p>See also <a href="tqdatatable.html#installEditorFactory">TQDataTable::installEditorFactory</a>().
<p>Example: <a href="sql.html#x2237">sql/overview/custom1/main.cpp</a>.
<h3 class=fn>void <a name="readField"></a>TQSqlForm::readField ( <a href="tqwidget.html">TQWidget</a> * widget )<tt> [virtual slot]</tt>
</h3>
Updates the widget <em>widget</em> with the value from the SQL field it
is mapped to. Nothing happens if no SQL field is mapped to the <em>widget</em>.
<h3 class=fn>void <a name="readFields"></a>TQSqlForm::readFields ()<tt> [virtual slot]</tt>
</h3>
Updates the widgets in the form with current values from the SQL
fields they are mapped to.
<p>Examples: <a href="sql.html#x2226">sql/overview/form1/main.cpp</a> and <a href="sql.html#x2232">sql/overview/form2/main.cpp</a>.
<h3 class=fn>void <a name="remove"></a>TQSqlForm::remove ( <a href="tqwidget.html">TQWidget</a> * widget )<tt> [virtual protected]</tt>
</h3>
Removes a <em>widget</em>, and hence the field it's mapped to, from the
form.
<h3 class=fn>void <a name="remove-2"></a>TQSqlForm::remove ( const <a href="tqstring.html">TQString</a> & field )<tt> [virtual]</tt>
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Removes <em>field</em> from the form.
<h3 class=fn>void <a name="setRecord"></a>TQSqlForm::setRecord ( <a href="tqsqlrecord.html">TQSqlRecord</a> * buf )<tt> [virtual]</tt>
</h3>
Sets <em>buf</em> as the record buffer for the form. To force the
display of the data from <em>buf</em>, use <a href="#readFields">readFields</a>().
<p> <p>See also <a href="#readFields">readFields</a>() and <a href="#writeFields">writeFields</a>().
<p>Examples: <a href="sql.html#x2238">sql/overview/custom1/main.cpp</a>, <a href="sql.html#x2227">sql/overview/form1/main.cpp</a>, and <a href="sql.html#x2233">sql/overview/form2/main.cpp</a>.
<h3 class=fn><a href="tqwidget.html">TQWidget</a> * <a name="widget"></a>TQSqlForm::widget ( uint i ) const
</h3>
Returns the <em>i</em>-th widget in the form. Useful for traversing
the widgets in the form.
<h3 class=fn><a href="tqsqlfield.html">TQSqlField</a> * <a name="widgetToField"></a>TQSqlForm::widgetToField ( <a href="tqwidget.html">TQWidget</a> * widget ) const
</h3>
Returns the SQL field that widget <em>widget</em> is mapped to.
<h3 class=fn>void <a name="writeField"></a>TQSqlForm::writeField ( <a href="tqwidget.html">TQWidget</a> * widget )<tt> [virtual slot]</tt>
</h3>
Updates the SQL field with the value from the <em>widget</em> it is
mapped to. Nothing happens if no SQL field is mapped to the <em>widget</em>.
<h3 class=fn>void <a name="writeFields"></a>TQSqlForm::writeFields ()<tt> [virtual slot]</tt>
</h3>
Updates the SQL fields with values from the widgets they are
mapped to. To actually update the database with the contents of
the record buffer, use <a href="tqsqlcursor.html#insert">TQSqlCursor::insert</a>(), <a href="tqsqlcursor.html#update">TQSqlCursor::update</a>()
or <a href="tqsqlcursor.html#del">TQSqlCursor::del</a>() as appropriate.
<p>Example: <a href="sql.html#x2234">sql/overview/form2/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>
|
