PHP MySQL 排序
PHP MySQL Order By
PHP mysql_query() 函数用于执行带有 order by 子句的选择查询。自 PHP 5.5 起，mysql_query() 函数已弃用。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按升序或降序获取数据。
让我们看一下从 emp4 表中按升序选择数据的查询名称列的基础。
SELECT * FROM emp4 order by name
让我们看一下查询以根据名称列降序从emp4表中选择数据。
SELECT * FROM emp4 order by name desc
PHP MySQLi 按示例排序
示例
<?php
$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<br/>';
$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 :{$row['id']} <br> ".
"EMP NAME : {$row['name']} <br> ".
"EMP SALARY : {$row['salary']} <br> ".
"--------------------------------<br>";
} //end of while
}else{
echo "0 results";
}
mysqli_close($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
--------------------------------
