I use this function to check if an element exists in the database.
<?php
$cat=$_REQUEST['cat'];
$db=sqlite_open('./sqlite_database.db',0666,$err) or die();
$query='select * from catsub where cat=\''.$cat.'\'';
$result=sqlite_has_more(sqlite_query($db,$query));
if($result===true ) echo 'Exists'; else echo 'Doesnt Exist';
sqlite_close($db);
?>
sqlite_has_more
(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0)
sqlite_has_more — Finds whether or not more rows are available
说明
sqlite_has_more
( resource
$result
) : boolFinds whether more rows are available from the given result set.
参数
-
result -
The SQLite result resource.
返回值
Returns TRUE if there are more rows available from the
result handle, or FALSE otherwise.
参见
- sqlite_num_rows() - Returns the number of rows in a buffered result set
- sqlite_changes() - Returns the number of rows that were changed by the most recent SQL statement
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User Contributed Notes 2 notes
dragosmocrii at gmail dot com ¶
16 years ago
dcchut at gmail dot com ¶
15 years ago
dragosmocrii at gmail dot com:
It is slightly more efficient to use the COUNT function. (And when I say slightly I mean whisker small slightly.)
<?php
// $db is a SQLite database connection
if (sqlite_single_query($db, 'SELECT COUNT(*) FROM records WHERE amount_owing > 500')) {
// There are records where the amount owing exceeds $500, do some action.
} else {
// No money for you!
}
?>
