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14<b>Db::set_errpfx</b>
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22<b><pre>
23#include &lt;db_cxx.h&gt;
24<p>
25void Db::set_errpfx(const char *errpfx);
26<p>
27void Db::get_errpfx(const char **errpfxp);
28</pre></b>
29<hr size=1 noshade>
30<b>Description: Db::set_errpfx</b>
31<p>Set the prefix string that appears before error messages issued by Berkeley DB.</p>
32<p>The Db::set_errpfx and <a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a> methods do not copy
33the memory to which the <b>errpfx</b> parameter refers; rather, they
34maintain a reference to it.  Although this allows applications to modify
35the error message prefix at any time (without repeatedly calling the
36interfaces), it means the memory must be maintained until the handle is
37closed.</p>
38<p>For <a href="../api_cxx/db_class.html">Db</a> handles opened inside of Berkeley DB environments, calling the
39Db::set_errpfx method affects the entire environment and is equivalent to calling
40the <a href="../api_cxx/env_set_errpfx.html">DbEnv::set_errpfx</a> method.</p>
41<p>The Db::set_errpfx method configures operations performed using the specified
42<a href="../api_cxx/db_class.html">Db</a> handle, not all operations performed on the underlying
43database.</p>
44<p>The Db::set_errpfx method may be called at any time during the life of the
45application.</p>
46<b>Parameters</b> <br>
47 <b>errpfx</b><ul compact><li>The <b>errpfx</b> parameter is the application-specified error prefix
48for additional error messages.</ul>
49<br>
50<hr size=1 noshade>
51<b>Description: Db::get_errpfx</b>
52<p>The Db::get_errpfx method returns the error prefix.</p>
53<p>The Db::get_errpfx method may be called at any time during the life of the
54application.</p>
55<p>The Db::get_errpfx method
56either returns a non-zero error value
57or throws an exception that encapsulates a non-zero error value on
58failure, and returns 0 on success.
59</p>
60<b>Parameters</b> <br>
61 <b>errpfxp</b><ul compact><li>The Db::get_errpfx method returns a reference to the
62error prefix in <b>errpfxp</b>.</ul>
63<br>
64<hr size=1 noshade>
65<br><b>Class</b>
66<a href="../api_cxx/db_class.html">Db</a>
67<br><b>See Also</b>
68<a href="../api_cxx/db_list.html">Databases and Related Methods</a>
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