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PDO::sqliteCreateCollation

(PHP 5 >= 5.3.11)

PDO::sqliteCreateCollation Registers a User Defined Function for use as a collating function in SQL statements

说明

public bool PDO::sqliteCreateCollation ( string $name , callable $callback )
Warning

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 。

参数

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:

int collation ( string $string1 , string $string2 )

返回值

成功时返回 TRUE , 或者在失败时返回 FALSE

范例

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

注释

Note:

This method is not available with the SQLite2 driver. Use the old style sqlite API for that instead.

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