<!--$Id: curput.so,v 10.18 2003/10/18 19:15:52 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB Reference Guide: Storing records with a cursor</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> <a name="2"><!--meow--></a><a name="3"><!--meow--></a> <table width="100%"><tr valign=top> <td><b><dl><dt>Berkeley DB Reference Guide:<dd>Access Methods</dl></b></td> <td align=right><a href="../am/curget.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../am/curdel.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p align=center><b>Storing records with a cursor</b></p> <p>The <a href="../../api_c/dbc_put.html">DBcursor->put</a> method stores records into the database using a cursor. In general, <a href="../../api_c/dbc_put.html">DBcursor->put</a> takes a key and inserts the associated data into the database, at a location controlled by a specified flag.</p> <p>There are several flags that you can set to customize storage:</p> <br> <b><a href="../../api_c/dbc_put.html#DB_AFTER">DB_AFTER</a></b><ul compact><li>Create a new record, immediately after the record to which the cursor refers.</ul> <b><a href="../../api_c/dbc_put.html#DB_BEFORE">DB_BEFORE</a></b><ul compact><li>Create a new record, immediately before the record to which the cursor refers.</ul> <b><a href="../../api_c/dbc_get.html#DB_CURRENT">DB_CURRENT</a></b><ul compact><li>Replace the data part of the record to which the cursor refers.</ul> <b><a href="../../api_c/dbc_put.html#DB_KEYFIRST">DB_KEYFIRST</a></b><ul compact><li>Create a new record as the first of the duplicate records for the supplied key.</ul> <b><a href="../../api_c/dbc_put.html#DB_KEYLAST">DB_KEYLAST</a></b><ul compact><li>Create a new record, as the last of the duplicate records for the supplied key.</ul> <br> <p>In all cases, the cursor is repositioned by a <a href="../../api_c/dbc_put.html">DBcursor->put</a> operation to point to the newly inserted key/data pair in the database.</p> <p>The following is a code example showing a cursor storing two data items in a database that supports duplicate data items:</p> <blockquote><pre>int store(dbp) DB *dbp; { DBC *dbcp; DBT key, data; int ret; <p> /* * The DB handle for a Btree database supporting duplicate data * items is the argument; acquire a cursor for the database. */ if ((ret = dbp->cursor(dbp, NULL, &dbcp, 0)) != 0) { dbp->err(dbp, ret, "DB->cursor"); goto err; } <p> /* Initialize the key. */ memset(&key, 0, sizeof(key)); key.data = "new key"; key.size = strlen(key.data) + 1; <p> /* Initialize the data to be the first of two duplicate records. */ memset(&data, 0, sizeof(data)); data.data = "new key's data: entry #1"; data.size = strlen(data.data) + 1; <p> /* Store the first of the two duplicate records. */ if ((ret = dbcp->c_put(dbcp, &key, &data, DB_KEYFIRST)) != 0) dbp->err(dbp, ret, "DB->cursor"); <p> /* Initialize the data to be the second of two duplicate records. */ data.data = "new key's data: entry #2"; data.size = strlen(data.data) + 1; <p> /* * Store the second of the two duplicate records. No duplicate * record sort function has been specified, so we explicitly * store the record as the last of the duplicate set. */ if ((ret = dbcp->c_put(dbcp, &key, &data, DB_KEYLAST)) != 0) dbp->err(dbp, ret, "DB->cursor"); <p> err: if ((ret = dbcp->c_close(dbcp)) != 0) dbp->err(dbp, ret, "DBcursor->close"); <p> return (0); }</pre></blockquote> <table width="100%"><tr><td><br></td><td align=right><a href="../am/curget.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../am/curdel.html"><img src="../../images/next.gif" alt="Next"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>