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static $__db;
if (!$__db) {
	$__db = new PDO('mysql:host=127.0.0.1;dbname=test_data', 'root', '');
	$__db->query('set names utf8');
}
$insertSql = 'insert into unique_sql (`sql`) values(\''.Str::addSlashes($sql).'\')';
if (!$__db -> query($insertSql)){
	var_dump($insertSql);
	print_r( $__db->errorInfo());exit();
}