<!--$Id: env_set_errcall.so,v 10.26 2002/08/18 21:16:26 bostic Exp $--> <!--Copyright 1997-2002 by Sleepycat Software, Inc.--> <!--All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv.set_errcall</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++"> </head> <body bgcolor=white> <a name="2"><!--meow--></a> <table width="100%"><tr valign=top> <td> <h1>DbEnv.set_errcall</h1> </td> <td align=right> <a href="../../db4-devel-4.1.25/api_java/c_index.html"><img src="../../db4-4.1.25/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.1.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <hr size=1 noshade> <tt> <h3><pre> import com.sleepycat.db.*; <p> public interface DbErrcall { public abstract void errcall(String errpfx, String msg); } public class DbEnv { public void set_errcall(DbErrcall errcall); ... } </pre></h3> <h1>Description</h1> When an error occurs in the Berkeley DB library, an exception is thrown. In some cases, however, the <b>errno</b> value may be insufficient to completely describe the cause of the error, especially during initial application debugging. <p>The DbEnv.set_errcall and <a href="../../db4-devel-4.1.25/api_java/db_set_errcall.html">Db.set_errcall</a> methods are used to enhance the mechanism for reporting error messages to the application. The DbEnv.set_errcall and <a href="../../db4-devel-4.1.25/api_java/db_set_errcall.html">Db.set_errcall</a> methods must be called with a single object argument. The object's class must implement the DbErrcall interface. In some cases, when an error occurs, Berkeley DB will invoke the object's errcall() method with two arguments; the first is the prefix string (as previously set by <a href="../../db4-devel-4.1.25/api_java/db_set_errpfx.html">Db.set_errpfx</a> or <a href="../../db4-devel-4.1.25/api_java/env_set_errpfx.html">DbEnv.set_errpfx</a>), the second will be an error message string. It is up to this method to display the message in an appropriate manner. <p>Alternatively, you can use the <a href="../../db4-devel-4.1.25/api_java/env_set_error_stream.html">DbEnv.set_error_stream</a> and <a href="../../db4-devel-4.1.25/api_java/db_set_error_stream.html">Db.set_error_stream</a> methods to display the additional information via an output stream. You should not mix these approaches. <p>This error-logging enhancement does not slow performance or significantly increase application size, and may be run during normal operation as well as during application debugging. <p>The DbEnv.set_errcall interface may be called at any time during the life of the application. <h1>Class</h1> <a href="../../db4-devel-4.1.25/api_java/env_class.html">DbEnv</a> <h1>See Also</h1> <a href="../../db4-devel-4.1.25/api_java/env_list.html">Database Environments and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.1.25/api_java/c_index.html"><img src="../../db4-4.1.25/images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../../db4-4.1.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> </body> </html>