PHP MySql增删改查的简单实例

mysql_connect()连接数据库

mysql_select_db选择数据库

mysql_fetch_assoc()获取结果集

mysql_query()执行sql语句

实例如下：

<?php
  $con=@mysql_connect("localhost","root","root");//连接数据库
  mysql_select_db("test",$con);//选择数据库
  $userInfo=mysql_query("select * from user",$con);//创建sql语句
  echo "<table>";
  while($row=mysql_fetch_assoc($userInfo))//获取结果集每一行的数据
  {
    echo "<tr>";
    echo "<td>";
    echo $row["id"];//获取行中的id
    echo "</td>";
    echo "<td>";
    echo $row["username"];
    echo "</td>";
    echo "<td>";
    echo $row["password"];
    echo "</td>";
    echo "</tr>";
  }
  echo "</table>";
  mysql_free_result($userInfo);//释放结果集
  mysql_close($con); //关闭数据库
  /*delete
  $d=@mysql_connect("localhost","root","root");
  mysql_select_db("test",$d);
  mysql_query("delete from user where id=1",$d);
  mysql_close($d);
  */
  /*insert
  $i=@mysql_connect("localhost","root","root");
  mysql_select_db("test",$i);
  mysql_query("insert into user(username,password) values("ad","ad")",$i);
  mysql_close($i);
  */
  //update
  $u=@mysql_connect("localhost","root","root");
  mysql_select_db("test",$u);
  mysql_query("update user set username="aaa" where username="00"",$u);
  echo "update user set username="ax" where id=2";
  mysql_close($u);
?>

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