php开发中sql语句拼接示例

 

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1.插入语句

$sql="insert into Ad(AdClassID,AdType) values('".$AdClassID."','".$AdType."')";
 

 2.从数据库中选出数据

$sql = "select * from AdClass order by ID desc";
$sql = "select * from admin where AdminID='".$_SESSION['AdminID']."'";
 

3.更新数据库中记录数据

$sql="update Ad set AdClassID='".$AdClassID."' where ID='".$ID."'";

//查询
$sql    =    "select    *   from    comment    where    comment_id    =    ".$comment_fid;

或：        

$sql    =    "select    *   from    comment    where    comment_id    =    '".$comment_fid."'";

//需要注意 这些引号问题
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