PHP MySQL Order By

PHP mysql_query()函数用于执行带有order by子句的select查询。自PHP 5.5以来，mysql_query()函数已被弃用。现在推荐使用其中的两种替代方法。

• mysqli_query()
• PDO::__query()

order by子句用于根据列进行升序或降序获取数据。

让我们看一下在emp4表中根据name列升序选择数据的查询。

SELECT * FROM emp4 order by name

让我们看看根据名称列降序选择 emp4 表中的数据的查询。

SELECT * FROM emp4 order by name desc

PHP MySQLi 按照示例排序

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