<!--$Id: seq_class.so,v 1.12 2004/10/18 19:46:31 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: db_sequence_create</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_sequence_create</b> </td> <td align=right> <a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a> <a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db.h> <p> typedef struct __db_sequence DB_SEQUENCE; <p> int db_sequence_create(DB_SEQUENCE **seq, DB *db, u_int32_t flags); </pre></b> <hr size=1 noshade> <b>Description: db_sequence_create</b> <p>The DB_SEQUENCE handle is the handle used to manipulate a sequence object. A sequence object is stored in a record in a database.</p> <p>DB_SEQUENCE handles are free-threaded if the <a href="../api_c/env_open.html#DB_THREAD">DB_THREAD</a> flag is specified to the <a href="../api_c/seq_open.html">DB_SEQUENCE->open</a> method when the sequence is opened. Once the <a href="../api_c/seq_close.html">DB_SEQUENCE->close</a> or <a href="../api_c/seq_remove.html">DB_SEQUENCE->remove</a> methods are called, the handle may not be accessed again, regardless of the method's return.</p> <p>Each handle opened on a sequence may maintain a separate cache of values which are returned to the application using the <a href="../api_c/seq_get.html">DB_SEQUENCE->get</a> method either singly or in groups depending on its <b>delta</b> parameter.</p> <p>The DB_SEQUENCE method creates a DB_SEQUENCE object that serves as the handle for a sequence. Calling the <a href="../api_c/seq_close.html">DB_SEQUENCE->close</a> or <a href="../api_c/seq_remove.html">DB_SEQUENCE->remove</a> methods will discard the handle.</p> <p>The db_sequence_create method returns a non-zero error value on failure and 0 on success. </p> <b>Parameters</b> <br> <b>seq</b><ul compact><li>The <b>seq</b> parameter references the memory into which the returned structure pointer is stored.</ul> <b>db</b><ul compact><li>The <b>db</b> parameter is an open database handle which holds the persistent data for the sequence. The database may be of any type, but may not have been configured to support duplicate data items.</ul> <b>flags</b><ul compact><li>The <b>flags</b> parameter is currently unused, and must be set to 0.</ul> <br> <br><b>Errors</b> <p>The db_sequence_create method may fail and return one of the following non-zero errors:</p> <br> <b>EINVAL</b><ul compact><li>An invalid flag value or parameter was specified.</ul> <br> <hr size=1 noshade> <br><b>Class</b> DB_SEQUENCE <br><b>See Also</b> <a href="../api_c/seq_list.html">Sequences and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>