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| author | jbj <devnull@localhost> | 2001-03-21 18:33:35 +0000 |
|---|---|---|
| committer | jbj <devnull@localhost> | 2001-03-21 18:33:35 +0000 |
| commit | 731946f4b90eb1173452dd30f1296dd825155d82 (patch) | |
| tree | 67535f54ecb7e5463c06e62044e4efd84ae0291d /db/docs/api_c/db_key_range.html | |
| parent | 7ed904da030dc4640ff9bce8458ba07cc09d830d (diff) | |
| download | librpm-tizen-731946f4b90eb1173452dd30f1296dd825155d82.tar.gz librpm-tizen-731946f4b90eb1173452dd30f1296dd825155d82.tar.bz2 librpm-tizen-731946f4b90eb1173452dd30f1296dd825155d82.zip | |
Initial revision
CVS patchset: 4644
CVS date: 2001/03/21 18:33:35
Diffstat (limited to 'db/docs/api_c/db_key_range.html')
| -rw-r--r-- | db/docs/api_c/db_key_range.html | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/db/docs/api_c/db_key_range.html b/db/docs/api_c/db_key_range.html new file mode 100644 index 000000000..1e3c4c91f --- /dev/null +++ b/db/docs/api_c/db_key_range.html @@ -0,0 +1,106 @@ +<!--$Id: db_key_range.so,v 10.5 2000/05/01 21:57:43 bostic Exp $--> +<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.--> +<!--All rights reserved.--> +<html> +<head> +<title>Berkeley DB: DB->key_range</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><tr valign=top> +<td> +<h1>DB->key_range</h1> +</td> +<td width="1%"> +<a href="../api_c/c_index.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> +<h3><pre> +#include <db.h> +<p> +int +DB->key_range(DB *db, DB_TXN *txnid, + DBT *key, DB_KEY_RANGE *key_range, u_int32_t flags); +</pre></h3> +<h1>Description</h1> +<p>The DB->key_range function returns an estimate of the proportion of keys +that are less than, equal to and greater than the specified key. The +underlying database must be of type Btree. +<p>The information is returned in the <b>key_range</b> argument, which +contains three elements of type double, <b>less</b>, <b>equal</b> and +<b>greater</b>. Values are in the range of 0 to 1, e.g., if the field +<b>less</b> is 0.05, that indicates that 5% of the keys in the database +are less than the key argument. The value for <b>equal</b> will be zero +if there is no matching key and non-zero otherwise. +<p>If the file is being accessed under transaction protection, the +<b>txnid</b> parameter is a transaction ID returned from +<a href="../api_c/txn_begin.html">txn_begin</a>, otherwise, NULL. +The DB->key_range function does not retain the locks it acquires for the +life of the transaction, so estimates may not be repeatable. +<p>The <b>flags</b> parameter is currently unused, and must be set to 0. +<p>The DB->key_range function returns a non-zero error value on failure and 0 on success. +<h1>Errors</h1> +<p>The DB->key_range function 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>The underlying database was not of type Btree. +</dl> +<p>The DB->key_range function 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->key_range function 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>See Also</h1> +<a href="../api_c/db_create.html">db_create</a>, +<a href="../api_c/db_close.html">DB->close</a>, +<a href="../api_c/db_cursor.html">DB->cursor</a>, +<a href="../api_c/db_del.html">DB->del</a>, +<a href="../api_c/db_err.html">DB->err</a>, +<a href="../api_c/db_fd.html">DB->fd</a>, +<a href="../api_c/db_get.html">DB->get</a>, +<a href="../api_c/db_get_byteswapped.html">DB->get_byteswapped</a>, +<a href="../api_c/db_get_type.html">DB->get_type</a>, +<a href="../api_c/db_join.html">DB->join</a>, +<a href="../api_c/db_key_range.html">DB->key_range</a>, +<a href="../api_c/db_open.html">DB->open</a>, +<a href="../api_c/db_put.html">DB->put</a>, +<a href="../api_c/db_remove.html">DB->remove</a>, +<a href="../api_c/db_set_bt_compare.html">DB->set_bt_compare</a>, +<a href="../api_c/db_set_bt_minkey.html">DB->set_bt_minkey</a>, +<a href="../api_c/db_set_bt_prefix.html">DB->set_bt_prefix</a>, +<a href="../api_c/db_set_cachesize.html">DB->set_cachesize</a>, +<a href="../api_c/db_set_dup_compare.html">DB->set_dup_compare</a>, +<a href="../api_c/db_set_errcall.html">DB->set_errcall</a>, +<a href="../api_c/db_set_errfile.html">DB->set_errfile</a>, +<a href="../api_c/db_set_errpfx.html">DB->set_errpfx</a>, +<a href="../api_c/db_set_flags.html">DB->set_flags</a>, +<a href="../api_c/db_set_h_ffactor.html">DB->set_h_ffactor</a>, +<a href="../api_c/db_set_h_hash.html">DB->set_h_hash</a>, +<a href="../api_c/db_set_h_nelem.html">DB->set_h_nelem</a>, +<a href="../api_c/db_set_lorder.html">DB->set_lorder</a>, +<a href="../api_c/db_set_malloc.html">DB->set_malloc</a>, +<a href="../api_c/db_set_pagesize.html">DB->set_pagesize</a>, +<a href="../api_c/db_set_paniccall.html">DB->set_paniccall</a>, +<a href="../api_c/db_set_q_extentsize.html">DB->set_q_extentsize</a>, +<a href="../api_c/db_set_realloc.html">DB->set_realloc</a>, +<a href="../api_c/db_set_re_delim.html">DB->set_re_delim</a>, +<a href="../api_c/db_set_re_len.html">DB->set_re_len</a>, +<a href="../api_c/db_set_re_pad.html">DB->set_re_pad</a>, +<a href="../api_c/db_set_re_source.html">DB->set_re_source</a>, +<a href="../api_c/db_stat.html">DB->stat</a>, +<a href="../api_c/db_sync.html">DB->sync</a>, +<a href="../api_c/db_upgrade.html">DB->upgrade</a> +and +<a href="../api_c/db_verify.html">DB->verify</a>. +</tt> +<table><tr><td><br></td><td width="1%"> +<a href="../api_c/c_index.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><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font> +</body> +</html> |