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82 lines
3.9 KiB
HTML
<!--$Id: db_set_errcall.so,v 10.7 1999/12/20 08:52:28 bostic Exp $-->
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<!--$Id: m4.errset,v 10.8 2000/02/19 20:57:57 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<!--All rights reserved.-->
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<html>
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<head>
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<title>Berkeley DB: Db.set_errcall</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
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</head>
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<body bgcolor=white>
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<a name="2"><!--meow--></a>
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<table><tr valign=top>
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<td>
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<h1>Db.set_errcall</h1>
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</td>
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<td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<hr size=1 noshade>
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<tt>
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<h3><pre>
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import com.sleepycat.db.*;
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<p>
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public interface DbErrcall
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{
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public abstract void errcall(String errpfx, String msg);
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}
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public class Db
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{
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public void set_errcall(DbErrcall errcall);
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...
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}
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</pre></h3>
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<h1>Description</h1>
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When an error occurs in the Berkeley DB library, an exception is thrown. In
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some cases, however, the <b>errno</b> value may be insufficient to
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completely describe the cause of the error, especially during initial
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application debugging.
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<p>The Db.set_errcall method is used to enhance the mechanism for reporting error
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messages to the application. The <a href="../api_java/env_set_errcall.html">DbEnv.set_errcall</a> method must be
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called with a single object argument. The object's class must implement
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the DbErrcall interface. In some cases, when an error occurs, Berkeley DB will
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invoke the object's errcall() method with two arguments; the first is the
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prefix string (as previously set by <a href="../api_java/db_set_errpfx.html">Db.set_errpfx</a> or
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<a href="../api_java/env_set_errpfx.html">DbEnv.set_errpfx</a>), the second will be an error message string.
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It is up to this method to display the message in an appropriate manner.
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<p>Alternatively, you can use the <a href="../api_java/env_set_error_stream.html">DbEnv.set_error_stream</a> method to display
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the additional information via an output stream. You should not mix these
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approaches.
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<p>This error logging enhancement does not slow performance or significantly
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increase application size, and may be run during normal operation as well
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as during application debugging.
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<p>For <a href="../api_java/db_class.html">Db</a> handles opened inside of Berkeley DB environments, calling the
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Db.set_errcall method affects the entire environment and is equivalent to calling
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the <a href="../api_java/env_set_errcall.html">DbEnv.set_errcall</a> method.
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<p>The Db.set_errcall interface may be used to configure Berkeley DB at any time
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during the life of the application.
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<h3>Class</h3>
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<a href="../api_java/dbenv_class.html">DbEnv</a>
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<h1>See Also</h1>
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<a href="../api_java/env_close.html">DbEnv.close</a>,
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<a href="../api_java/env_open.html">DbEnv.open</a>,
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<a href="../api_java/env_remove.html">DbEnv.remove</a>,
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<a href="../api_java/env_strerror.html">DbEnv.strerror</a>,
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<a href="../api_java/env_version.html">DbEnv.get_version_string</a>
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<a href="../api_java/env_set_cachesize.html">DbEnv.set_cachesize</a>,
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<a href="../api_java/env_set_errcall.html">DbEnv.set_errcall</a>,
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<a href="../api_java/env_set_error_stream.html">DbEnv.set_error_stream</a>,
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<a href="../api_java/env_set_errpfx.html">DbEnv.set_errpfx</a>,
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<a href="../api_java/env_set_flags.html">DbEnv.set_flags</a>,
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<a href="../api_java/env_set_mutexlocks.html">DbEnv.set_mutexlocks</a>,
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and
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<a href="../api_java/env_set_verbose.html">DbEnv.set_verbose</a>.
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</tt>
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<table><tr><td><br></td><td width="1%">
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<a href="../api_java/java_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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</body>
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</html>
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