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<!--$Id: db_remove.so,v 10.3 2002/08/18 21:15:51 bostic Exp $--> <!--$Id: env_dbremove.so,v 10.49 2004/12/16 19:13:01 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: Db::remove</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <b>Db::remove</b> </td> <td align=right> <a href="../../db4-devel-4.7.25/api_cxx/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a> <a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db_cxx.h> <p> int Db::remove(const char *file, const char *database, u_int32_t flags); </pre></b> <hr size=1 noshade> <b>Description: Db::remove</b> <p>The Db::remove method removes the database specified by the <b>file</b> and <b>database</b> parameters. If no <b>database</b> is specified, the underlying file represented by <b>file</b> is removed, incidentally removing all of the databases it contained.</p> <p>Applications should never remove databases with open <a href="../../db4-devel-4.7.25/api_cxx/db_class.html">Db</a> handles, or in the case of removing a file, when any database in the file has an open handle. For example, some architectures do not permit the removal of files with open system handles. On these architectures, attempts to remove databases currently in use by any thread of control in the system may fail.</p> <p>The Db::remove method should not be called if the remove is intended to be transactionally safe; the <a href="../../db4-devel-4.7.25/api_cxx/env_dbremove.html">DbEnv::dbremove</a> method should be used instead.</p> <p>The Db::remove method may not be called after calling the <a href="../../db4-devel-4.7.25/api_cxx/db_open.html">Db::open</a> method on any <a href="../../db4-devel-4.7.25/api_cxx/db_class.html">Db</a> handle. If the <a href="../../db4-devel-4.7.25/api_cxx/db_open.html">Db::open</a> method has already been called on a <a href="../../db4-devel-4.7.25/api_cxx/db_class.html">Db</a> handle, close the existing handle and create a new one before calling Db::remove.</p> <p>The <a href="../../db4-devel-4.7.25/api_cxx/db_class.html">Db</a> handle may not be accessed again after Db::remove is called, regardless of its return.</p> <p>The Db::remove 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. </p> <b>Parameters</b> <br> <b>database</b><ul compact><li>The <b>database</b> parameter is the database to be removed.</ul> <b>file</b><ul compact><li>The <b>file</b> parameter is the physical file which contains the database(s) to be removed.</ul> <p>When using a Unicode build on Windows (the default), the <b>file</b> argument will be interpreted as a UTF-8 string, which is equivalent to ASCII for Latin characters.</p> <b>flags</b><ul compact><li>The <b>flags</b> parameter is currently unused, and must be set to 0.</ul> <br> <br><b>Environment Variables</b> <p>If the database was opened within a database environment, the environment variable <b>DB_HOME</b> may be used as the path of the database environment home.</p> <p>Db::remove is affected by any database directory specified using the <a href="../../db4-devel-4.7.25/api_cxx/env_set_data_dir.html">DbEnv::set_data_dir</a> method, or by setting the "set_data_dir" string in the environment's <a href="../../db4-devel-4.7.25/ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file.</p> <br><b>Errors</b> <p>The Db::remove method may fail and throw <a href="../../db4-devel-4.7.25/api_cxx/except_class.html">DbException</a>, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:</p> <br> <b>EINVAL</b><ul compact><li>If Db::remove called after <a href="../../db4-devel-4.7.25/api_cxx/db_open.html">Db::open</a> was called; or if an invalid flag value or parameter was specified.</ul> <br> <br> <b>ENOENT</b><ul compact><li>The file or directory does not exist.</ul> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_cxx/db_class.html">Db</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_cxx/db_list.html">Databases and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.7.25/api_cxx/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a><a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. 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