php操作mysql数据库

<?php

$link=mysql_connect("localhost","root","root");

if($link){

  }else{

 echo "连接失败";

 exit;

    }

mysql_select_db("test");

$sql="create table shops(id int auto_increment not null,name varchar(30) not null, price double not null default '0.00', num int not null default '0', primary key(id),key(name,price))";

//$sql2="alter table shops add desn varchar(64) after price";

$sql2="insert into shops(name,price,desn,num)values('php',10,'php hello',5)";

$sql3="delete from shops where id<15";

$res=mysql_query($sql3);

if($res){

  }else{

 echo mysql_errno().":".mysql_error()."/n";

    }

if(mysql_affected_rows()>0){

 echo "执行成功:"."影响行数".mysql_affected_rows()."最后自动增长的ID=".mysql_insert_id();

  }else{

 echo "记录没有改变";

    }

mysql_close();

?>

从结果集将记录取出来

mysql_fetch_row($res) 索引数组

mysql_fetch_assoc($res) 关联数据

mysql_fetch_array($res) 索引和关联

mysql_fetch_object($res) 对象

自我复制

insert into products(cid,name,price,num,desn,ptime)select cid,name,price,num,desn,ptime from products;