PHP问题（8.20）在线给分！

php中：
  下面是我的连mysql的查询的代码： 
  $db=mysql_connect("localhost","root","mysql"); 
  mysql_select_db("mb",$db); 
  $sqltxt="select*  from  user where name='".$name."'"; 
  $Result=mysql_query($sqltxt,$db); 
  $row = mysql_fetch_array($Result);


各位帮我修改成三种情况
              insert 
            update
            delete


要可运行的代码，
谢谢。

PHP code

$tmp_insert_sql="insert into user(name) values('".$name."')"; 
$query_insert=mysql_query($tmp_insert_sql,$db);
$tmp_update_sql="update user set name='xxx' where name='".$name."'"; 
$query_update=mysql_query($tmp_update_sql,$db);
$tmp_delete_sql="delete from user  where name='".$name."'"; 
$query_delete=mysql_query($tmp_delete_sql,$db);

  懒人一个，纸上得来终觉浅

PHP code

//select
$sqltxt="select*  from  user where name='".$name."'";  
//insert  user
 $sqltxt="insert into   user  (字段1，字段2) values (字段1值，字段2值) where name='".$name."'";  
//update 
$sqltxt="update user set 字段=值 where name='".$name."'";  
//delete 
$sqltxt="delete   from  user where name='".$name."'";  
字段值一般加引号