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
|
<!--$Id: env_dbremove.html,v 1.1.1.1 2003/11/20 22:14:25 toshok Exp $-->
<!--Copyright 1997-2002 by Sleepycat Software, Inc.-->
<!--All rights reserved.-->
<!--See the file LICENSE for redistribution information.-->
<html>
<head>
<title>Berkeley DB: DB_ENV->dbremove</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>DB_ENV->dbremove</h1>
</td>
<td align=right>
<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a>
</td></tr></table>
<hr size=1 noshade>
<tt>
<h3><pre>
#include <db.h>
<p>
int
DB_ENV->dbremove(DB_ENV *dbenv, DB_TXN *txnid,
const char *file, const char *database, u_int32_t flags);
</pre></h3>
<h1>Description</h1>
<p>The DB_ENV->dbremove method removes the database specified by the
<b>file</b> and <b>database</b> arguments. If no <b>database</b> is
specified, the underlying file represented by <b>file</b> is removed,
incidentally removing all databases that it contained.
<p>Applications should never remove databases with open <a href="../api_c/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
will fail.
<p>If the operation is to be transaction-protected, the <b>txnid</b>
parameter is a transaction handle returned from <a href="../api_c/txn_begin.html">DB_ENV->txn_begin</a>;
otherwise, NULL.
<p>The <b>flags</b> value must be set to 0 or
the following value:
<p><dl compact>
<p><dt><a name="DB_AUTO_COMMIT">DB_AUTO_COMMIT</a><dd>Enclose the DB_ENV->dbremove call within a transaction. If the call succeeds,
changes made by the operation will be recoverable. If the call fails,
the operation will have made no changes.
</dl>
<p>The DB_ENV->dbremove method returns a non-zero error value on failure and 0 on success.
<h1>Environment Variables</h1>
<p><dl compact>
<p><dt>DB_HOME<dd>The
environment variable <b>DB_HOME</b> may be used as the path of the
database environment home.
<p>DB_ENV->dbremove is affected by any database directory specified using the
<a href="../api_c/env_set_data_dir.html">DB_ENV->set_data_dir</a> method, or by setting the "set_data_dir" string
in the environment's <b>DB_CONFIG</b> file.
</dl>
<h1>Errors</h1>
<p>The DB_ENV->dbremove method may fail and return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>DB_LOCK_DEADLOCK<dd>The operation was selected to resolve a deadlock.
</dl>
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>A database in the file is currently open.
<p>Called before <a href="../api_c/env_open.html">DB_ENV->open</a> was called.
</dl>
<p>The DB_ENV->dbremove method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the DB_ENV->dbremove method may fail and
return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_c/env_class.html">DB_ENV</a>
<h1>See Also</h1>
<a href="../api_c/env_list.html">Database Environments and Related Methods</a>
</tt>
<table width="100%"><tr><td><br></td><td align=right>
<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../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>
|
