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
|
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Dbc::cmp()</title>
<link rel="stylesheet" href="apiReference.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
<link rel="up" href="dbc.html" title="Chapter 3. The Dbc Handle" />
<link rel="prev" href="dbcclose.html" title="Dbc::close()" />
<link rel="next" href="dbccount.html" title="Dbc::count()" />
</head>
<body>
<div xmlns="" class="navheader">
<div class="libver">
<p>Library Version 11.2.5.3</p>
</div>
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">Dbc::cmp()</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="dbcclose.html">Prev</a> </td>
<th width="60%" align="center">Chapter 3.
The Dbc Handle
</th>
<td width="20%" align="right"> <a accesskey="n" href="dbccount.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="dbccmp"></a>Dbc::cmp()</h2>
</div>
</div>
</div>
<pre class="programlisting">#include <db_cxx.h>
int
Dbc::cmp(Dbc *other_cursor, int *result, u_int32_t flags);</pre>
<p>
The <code class="methodname">Dbc::cmp()</code> method compares two cursors for equality. Two cursors are equal if and only if they are positioned on the same item in the same database.
</p>
<p>
The <code class="methodname">Dbc::cmp()</code> <span>
<span>
method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6127824"></a>Parameters</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6128208"></a>other_cursor</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>other_cursor</strong></span> parameter references
another cursor handle that will be used as the comparator.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6121824"></a>result</h4>
</div>
</div>
</div>
<p>
If the call is successful and both cursors are positioned on the same item, result is set to zero. If the call is successful but the cursors are not positioned on the same item, result is set to a non-zero value. If the call is unsuccessful, the value of result should be ignored.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6089792"></a>flags</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>flags</strong></span> parameter is currently
unused, and must be set to 0.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6088128"></a>Errors</h3>
</div>
</div>
</div>
<p>
The <code class="methodname">Dbc::cmp()</code> <span>
<span>
method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp6135904"></a>EINVAL</h4>
</div>
</div>
</div>
<p>
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
If either of the cursors are already closed.
</p>
</li>
<li>
<p>
If the cursors have been opened against different databases.
</p>
</li>
<li>
<p>
If either of the cursors have not been positioned.
</p>
</li>
<li>
<p>
If the other_dbc parameter is NULL.
</p>
</li>
<li>
<p>
If the result parameter is NULL.
</p>
</li>
</ul>
</div>
<p>
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6140952"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="dbc.html" title="Chapter 3. The Dbc Handle">Dbc</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp6118336"></a>See Also</h3>
</div>
</div>
</div>
<p>
<a class="xref" href="dbc.html#dbclist" title="Database Cursors and Related Methods">Database Cursors and Related Methods</a>
</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="dbcclose.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="dbc.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="dbccount.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Dbc::close() </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> Dbc::count()</td>
</tr>
</table>
</div>
</body>
</html>
|
