PHP SQLite3 Registers a PHP function for use as an SQL collating function

说明

public SQLite3::createCollation ( string $name , callable $callback ) : bool

Registers a PHP function or user-defined function for use as a collating function within SQL statements.

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 values 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:

collation ( mixed $value1 , mixed $value2 ) : int

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

范例

Example #1 SQLite3::createCollation() example

Register the PHP function strnatcmp() as a collating sequence in the SQLite3 database.

 <?php

$db = new SQLite3(":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->createCollation('NATURAL_CMP', 'strnatcmp');

$defaultSort = $db->query("SELECT col1 FROM test ORDER BY col1");
$naturalSort = $db->query("SELECT col1 FROM test ORDER BY col1 COLLATE NATURAL_CMP");

echo "default:\n";
while ($row = $defaultSort->fetchArray()){
    echo $row['col1'], "\n";
}

echo "\nnatural:\n";
while ($row = $naturalSort->fetchArray()){
    echo $row['col1'], "\n";
}

$db->close();

?>

以上例程会输出：

default:
a1
a10
a2

natural:
a1
a2
a10

参见

The SQLite collation documentation: » http://sqlite.org/datatype3.html#collation