1<!--$Id: dbc_put.so,v 11.18 2004/12/02 18:21:08 bostic Exp $--> 2<!--$Id: m4.tcl,v 11.28 2004/12/16 19:13:05 bostic Exp $--> 3<!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> 4<!--See the file LICENSE for redistribution information.--> 5<html> 6<head> 7<title>Berkeley DB: dbc put</title> 8<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> 9<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> 10</head> 11<body bgcolor=white> 12<table width="100%"><tr valign=top> 13<td> 14<b><i>dbc</i> <b>put</b></b> 15</td> 16<td align=right> 17<a href="../api_tcl/api_tcl.html"><img src="../images/api.gif" alt="API"></a> 18<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td> 19</tr></table> 20<hr size=1 noshade> 21<tt> 22<b><pre>dbc put 23 [-after] 24 [-before] 25 [-current] 26 [-partial {doff dlen}] 27 data 28dbc put 29 [-keyfirst] 30 [-keylast] 31 [-partial {doff dlen}] 32 key data 33</pre></b> 34<b>Description(dbc put)</b> 35<p>The <i>dbc</i> <b>put</b> command stores the specified key/data pair into the 36database. One of the following options must be specified:</p> 37<br> 38<b>-after</b><ul compact><li>In the case of the Btree and Hash access methods, insert the data element 39as a duplicate element of the key to which the cursor refers. The new 40element appears immediately after the current cursor position. It is an 41error to specify <b>-after</b> if the underlying Btree or Hash database 42was not created with the <b>-dup</b> option. No key argument should be 43specified. 44<p>In the case of the Recno access method, it is an error to specify the 45<b>-after</b> option if the underlying Recno database was not created 46with the <b>-renumber</b> option. If the <b>-renumber</b> option was 47specified, a new key is created, all records after the inserted item 48are automatically renumbered, and the key of the new record is returned 49in the structure to which the key argument refers. The initial value of 50the key parameter is ignored. See <b>berkdb open</b> for more information.</p> 51<p>In the case of the Queue access method, it is always an error to specify 52<b>-after</b>.</p> 53<p>If the current cursor record has already been deleted, and the underlying 54access method is Hash, <i>dbc</i> <b>put</b> will throw a Tcl error. If the 55underlying access method is Btree or Recno, the operation will succeed.</p></ul> 56<b>-before</b><ul compact><li>In the case of the Btree and Hash access methods, insert the data element 57as a duplicate element of the key to which the cursor refers. The new 58element appears immediately before the current cursor position. It is an 59error to specify <b>-before</b> if the underlying Btree or Hash database 60was not created with the <b>-dup</b> option. No key argument should be 61specified. 62<p>In the case of the Recno access method, it is an error to specify 63<b>-before</b> if the underlying Recno database was not created with the 64<b>-before</b> option. If the <b>-before</b> option was specified, a 65new key is created, the current record and all records after it are 66automatically renumbered, and the key of the new record is returned in 67the structure to which the key argument refers. The initial value of the 68key parameter is ignored. See <b>berkdb open</b> for more information.</p> 69<p>In the case of the Queue access method, it is always an error to specify 70<b>-before</b>.</p> 71<p>If the current cursor record has already been deleted and the underlying 72access method is Hash, <i>dbc</i> <b>put</b> will throw a Tcl error. If the 73underlying access method is Btree or Recno, the operation will succeed.</p></ul> 74<b>-current</b><ul compact><li>Overwrite the data of the key/data pair to which the cursor refers with 75the specified data item. No key argument should be specified. 76<p>If the <b>-dupsort</b> option was specified to <b>berkdb open</b> and the 77data item of the key/data pair to which the cursor refers does not 78compare equally to the data parameter, <i>dbc</i> <b>put</b> will throw a Tcl 79error.</p> 80<p>If the current cursor record has already been deleted and the underlying 81access method is Hash, <i>dbc</i> <b>put</b> will throw a Tcl error. If the 82underlying access method is Btree, Queue, or Recno, the operation will 83succeed.</p></ul> 84<b>-keyfirst</b><ul compact><li>In the case of the Btree and Hash access methods, insert the specified 85key/data pair into the database. 86<p>If the key already exists in the database, and the <b>-dupsort</b> option 87was specified to <b>berkdb open</b>, the inserted data item is added in its 88sorted location. If the key already exists in the database, and the 89<b>-dupsort</b> option was not specified, the inserted data item is added 90as the first of the data items for that key.</p> 91<p>The <b>-keyfirst</b> option may not be specified to the Queue or Recno 92access methods.</p></ul> 93<b>-keylast</b><ul compact><li>In the case of the Btree and Hash access methods, insert the specified 94key/data pair into the database. 95<p>If the key already exists in the database, and the <b>-dupsort</b> option 96was specified to <b>berkdb open</b>, the inserted data item is added in its 97sorted location. If the key already exists in the database, and the 98<b>-dupsort</b> option was not specified, the inserted data item is added 99as the last of the data items for that key.</p> 100<p>The <b>-keylast</b> option may not be specified to the Queue or Recno 101access methods.</p></ul> 102<b>-partial {doff dlen}</b><ul compact><li><p>The <b>dlen</b> bytes starting <b>doff</b> bytes from the beginning 103of the specified key's data record are replaced by the data specified 104by the data and size structure elements. If <b>dlen</b> is smaller 105than the length of the supplied data, the record will grow; if 106<b>dlen</b> is larger than the length of the supplied data, the record 107will shrink. If the specified bytes do not exist, the record will be 108extended using nul bytes as necessary, and the <i>dbc</i> <b>put</b> call will succeed. 109</p> 110<p>It is an error to attempt a partial put using the <i>dbc</i> <b>put</b> command in a database 111that supports duplicate records. Partial puts in databases supporting 112duplicate records must be done using a <i>dbc</i> <b>put</b> command.</p> 113<p>It is an error to attempt a partial put with differing <b>dlen</b> and 114supplied data length values in Queue or Recno databases with fixed-length 115records.</p></ul> 116<br> 117<p>If a key is specified, and 118if the underlying database is a Queue or Recno database, the given key 119will be interpreted by Tcl as an integer. For all other database types, 120the key is interpreted by Tcl as a byte array.</p> 121<p>If <i>dbc</i> <b>put</b> fails for any reason, the state of the cursor will be 122unchanged. If <i>dbc</i> <b>put</b> succeeds and an item is inserted into the 123database, the cursor is always positioned to refer to the newly inserted 124item.</p> 125<p>The <i>dbc</i> <b>put</b> command returns 0 on success, and in the case of error, a Tcl error 126is thrown.</p> 127</tt> 128<table width="100%"><tr><td><br></td><td align=right> 129<a href="../api_tcl/api_tcl.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a> 130</td></tr></table> 131<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> 132</body> 133</html> 134