php order by 大小,PHP MySQL ORDER BY排序语句

PHP mysql_query()函数用于通过order by子句执行选择查询。从PHP 5.5开始, 不推荐使用mysql_query()函数。现在建议使用两种替代方法之一。

mysqli_query()

PDO :: __ query()

order by子句用于在列的基础上以升序或降序获取数据。

让我们看一下根据名称列以升序从emp4表中选择数据的查询。

SELECT * FROM emp4 order by name

让我们看一下查询, 以根据名称列从emp4表中降序选择数据。

SELECT * FROM emp4 order by name desc

PHP MySQLi示例排序

例子

$host = 'localhost:3306';

$user = '';

$pass = '';

$dbname = 'test';

$conn = mysqli_connect($host, $user, $pass, $dbname);

if(!$conn){

die('Could not connect: '.mysqli_connect_error());

}

echo 'Connected successfully
';

$sql = 'SELECT * FROM emp4 order by name';

$retval=mysqli_query($conn, $sql);

if(mysqli_num_rows($retval) > 0){

while($row = mysqli_fetch_assoc($retval)){

echo "EMP ID :{$row['id']}
".

"EMP NAME : {$row['name']}
".

"EMP SALARY : {$row['salary']}
".

"--------------------------------
";

} //end of while

}else{

echo "0 results";

}

mysqli_close($conn);

?>

输出

Connected successfully

EMP ID :3

EMP NAME : jai

EMP SALARY : 90000

--------------------------------

EMP ID :2

EMP NAME : karan

EMP SALARY : 40000

--------------------------------

EMP ID :1

EMP NAME : ratan

EMP SALARY : 9000

--------------------------------