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(PHP 5 >= 5.3.11)
PDO::sqliteCreateCollation — Registers a User Defined Function for use as a collating function in SQL statements
$name
, callable $callback
)此函数是实验性的。此函数的表象,包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。
name
Name of the SQL collating 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 collation. It should accept two strings and return as strcmp() does, i.e. it should return -1, 1, or 0 if the first string sorts before, sorts after, or is equal to the second.
This function need to be defined as:
$string1
, string $string2
)
成功时返回 TRUE
, 或者在失败时返回 FALSE
。
Example #1 PDO::sqliteCreateCollation() example
<?php
$db = new PDO ( 'sqlite::memory:' );
$db -> exec ( "CREATE TABLE test (col1 string)" );
$db -> exec ( "INSERT INTO test VALUES ('a1')" );
$db -> exec ( "INSERT INTO test VALUES ('a10')" );
$db -> exec ( "INSERT INTO test VALUES ('a2')" );
$db -> sqliteCreateCollation ( 'NATURAL_CMP' , 'strnatcmp' );
foreach ( $db -> query ( "SELECT col1 FROM test ORDER BY col1" ) as $row ) {
echo $row [ 'col1' ] . "\n" ;
}
echo "\n" ;
foreach ( $db -> query ( "SELECT col1 FROM test ORDER BY col1 COLLATE NATURAL_CMP" ) as $row ) {
echo $row [ 'col1' ] . "\n" ;
}
?>
以上例程会输出:
a1 a10 a2a1 a2 a10
Note:
This method is not available with the SQLite2 driver. Use the old style sqlite API for that instead.