SQLite3::createAggregate
Since regular expression is not supported by default SQLite, we can create a user function to do the job.
<?php
$db = new SQLite3("database.sqlit3", 0666);
// create a function named "preg_match"
// with the php core function "preg_match"
if ($db->createFunction("preg_match", "preg_match", 2) === FALSE)
exit("Failed creating function\n");
// this query will then works as expected
$result = $db->query("SELECT * FROM table1 WHERE
preg_match('/^(apple|orange)$/', variable1)");
?>
SQLite3::createFunction
(PHP 5 >= 5.3.0)
SQLite3::createFunction — Registers a PHP function for use as an SQL scalar function
Description
public bool SQLite3::createFunction
( string $name
, mixed $callback
[, int $argument_count = -1
] )
Registers a PHP function or user-defined function for use as an SQL scalar function for use within SQL statements.
Parameters
- name
-
Name of the SQL function to be created or redefined.
- callback
-
The name of a PHP function or user-defined function to apply as a callback, defining the behavior of the SQL function.
- argument_count
-
The number of arguments that the SQL function takes. If this parameter is negative, then the SQL function may take any number of arguments.
Return Values
Returns TRUE upon successful creation of the function, FALSE on failure.
Examples
Example #1 SQLite3::createFunction() example
<?php
function my_udf_md5($string) {
return md5($string);
}
$db = new SQLite3('mysqlitedb.db');
$db->createFunction('my_udf_md5', 'my_udf_md5');
var_dump($db->querySingle('SELECT my_udf_md5("test")'));
?>
The above example will output something similar to:
string(32) "098f6bcd4621d373cade4e832627b4f6"
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User Contributed Notes
SQLite3::createFunction
koalay at gmail dot com
26-May-2010 07:43