diff options
Diffstat (limited to 'bdb/docs/ref/am/curget.html')
| -rw-r--r-- | bdb/docs/ref/am/curget.html | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/bdb/docs/ref/am/curget.html b/bdb/docs/ref/am/curget.html deleted file mode 100644 index 129fa272bbd..00000000000 --- a/bdb/docs/ref/am/curget.html +++ /dev/null @@ -1,74 +0,0 @@ -<!--$Id: curget.so,v 10.14 2000/12/18 21:05:13 bostic Exp $--> -<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.--> -<!--All rights reserved.--> -<html> -<head> -<title>Berkeley DB Reference Guide: Retrieving records with a cursor</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> <a name="3"><!--meow--></a> -<table><tr valign=top> -<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Access Methods</dl></h3></td> -<td width="1%"><a href="../../ref/am/cursor.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/am/curput.html"><img src="../../images/next.gif" alt="Next"></a> -</td></tr></table> -<p> -<h1 align=center>Retrieving records with a cursor</h1> -<p>The <a href="../../api_c/dbc_get.html">DBcursor->c_get</a> function is the standard interface for retrieving records from -the database with a cursor. The <a href="../../api_c/dbc_get.html">DBcursor->c_get</a> function takes a flag which -controls how the cursor is positioned within the database and returns the -key/data item associated with that positioning. Similar to -<a href="../../api_c/db_get.html">DB->get</a>, <a href="../../api_c/dbc_get.html">DBcursor->c_get</a> may also take a supplied key and retrieve -the data associated with that key from the database. There are several -flags that you can set to customize retrieval. -<h3>Cursor position flags</h3> -<p><dl compact> -<p><dt><a href="../../api_c/dbc_get.html#DB_FIRST">DB_FIRST</a>, <a href="../../api_c/dbc_get.html#DB_LAST">DB_LAST</a><dd>Return the first (last) record in the database. -<p><dt><a href="../../api_c/dbc_get.html#DB_NEXT">DB_NEXT</a>, <a href="../../api_c/dbc_get.html#DB_PREV">DB_PREV</a><dd>Return the next (previous) record in the database. -<p><dt><a href="../../api_c/dbc_get.html#DB_NEXT_DUP">DB_NEXT_DUP</a><dd>Return the next record in the database, if it is a duplicate data item -for the current key. -<p><dt><a href="../../api_c/dbc_get.html#DB_NEXT_NODUP">DB_NEXT_NODUP</a>, <a href="../../api_c/dbc_get.html#DB_PREV_NODUP">DB_PREV_NODUP</a><dd>Return the next (previous) record in the database that is not a -duplicate data item for the current key. -<p><dt><a href="../../api_c/dbc_get.html#DB_CURRENT">DB_CURRENT</a><dd>Return the record from the database currently referenced by the -cursor. -</dl> -<h3>Retrieving specific key/data pairs</h3> -<p><dl compact> -<p><dt><a href="../../api_c/dbc_get.html#DB_SET">DB_SET</a><dd>Return the record from the database that matches the supplied key. In -the case of duplicates the first duplicate is returned and the cursor -is positioned at the beginning of the duplicate list. The user can then -traverse the duplicate entries for the key. -<p><dt><a href="../../api_c/dbc_get.html#DB_SET_RANGE">DB_SET_RANGE</a><dd>Return the smallest record in the database greater than or equal to the -supplied key. This functionality permits partial key matches and range -searches in the Btree access method. -<p><dt><a href="../../api_c/db_get.html#DB_GET_BOTH">DB_GET_BOTH</a><dd>Return the record from the database that matches both the supplied key -and data items. This is particularly useful when there are large -numbers of duplicate records for a key, as it allows the cursor to -easily be positioned at the correct place for traversal of some part of -a large set of duplicate records. -</dl> -<h3>Retrieving based on record numbers</h3> -<p><dl compact> -<p><dt><a href="../../api_c/db_get.html#DB_SET_RECNO">DB_SET_RECNO</a><dd>If the underlying database is a Btree, and was configured so that it is -possible to search it by logical record number, retrieve a specific -record based on a record number argument. -<p><dt><a href="../../api_c/dbc_get.html#DB_GET_RECNO">DB_GET_RECNO</a><dd>If the underlying database is a Btree, and was configured so that it is -possible to search it by logical record number, return the record number -for the record referenced by the cursor. -</dl> -<h3>Special-purpose flags</h3> -<p><dl compact> -<p><dt><a href="../../api_c/db_get.html#DB_CONSUME">DB_CONSUME</a><dd>Read-and-delete: the first record (the head) of the queue is returned and -deleted. The underlying database must be a Queue. -<p><dt><a href="../../api_c/dbc_get.html#DB_RMW">DB_RMW</a><dd>Read-modify-write: acquire write locks instead of read locks during -retrieval. This can enhance performance in threaded applications by -reducing the chance of deadlock. -</dl> -<p>In all cases, the cursor is repositioned by a <a href="../../api_c/dbc_get.html">DBcursor->c_get</a> operation -to point to the newly-returned key/data pair in the database. -<table><tr><td><br></td><td width="1%"><a href="../../ref/am/cursor.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/am/curput.html"><img src="../../images/next.gif" alt="Next"></a> -</td></tr></table> -<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> -</body> -</html> |