php封装操作数据库的类

 ConnDB.class.inc.php文件

 <?php
 // 连接数据库的类
 class ConnDB
 {
         var $dbtype;
         var $host;
         var $usr;
         var $pwd;
         var $dbname;
         var $conn;
         // 构造方法
         function ConnDB($dbtype,$host,$user,$pwd,$dbname)
         {
                 $this->dbtype = $dbtype;
                 $this->host = $host;
                 $this->pwd = $pwd;
                 $this->dbname = $dbname;
                 $this->user = $user;
         }
         function GetConn()
         {
             $this->conn = mysql_connect($this->host,$this->user,$this->pwd) or die("数据库服务器连接错误".mysql_error());
             mysql_select_db($this->dbname,$this->conn) or die("数据库访问错误".mysql_error());
             mysql_query("set names gb2312");// 设置编码格式
             return $this->conn;
         }
         function __destruct()
         {
             $this->CloseDB();
         }
         function CloseDB()
         {
             mysql_close($this->conn);
         }

 }
 // 数据库操作类
 class OperateDB
 {
     function Execsql($sql,$conn)
     {
             $sqltype = strtolower(substr(trim($sql),0,6));// 截取sql语句中的前6个字符串,并转换成小写
             $result = mysql_query($sql,$conn);// 执行sql语句
             $calback_arrary = array();// 定义二维数组
             if ("select" == $sqltype)// 判断执行的是select语句
             {

                 if (false == $result)
                 {
                     return false;
                 }
                 else if (0 == mysql_num_rows($result))
                 {
                     return false;
                 }
                 else
                 {
                     while($result_array = mysql_fetch_array($result))
                     {
                     array_push($calback_arrary, $result_array);
                     }
                     return $calback_arrary;// 成功返回查询结果的数组
                 }
             }
             else if ("update" == $sqltype || "insert" == $sqltype || "delete" == $sqltype)
             {
                     if ($result)
                     {
                         return true;
                     }
                     else
                     {
                         return false;
                     }
             }
     }
 }

 ?>

 // conndb.inc.php文件
 <?php
 require("ConnDB.class.inc.php");
 $ccon = new ConnDB("mysql","localhost","root","root","think_cms");
 $operatedb = new OperateDB();
 $conn = $ccon->GetConn();

 ?>

用法:

 <?php
 require("conndb.inc.php");
 $result = $operatedb->Execsql("select * from cms_post where user_id=2",$conn);
 foreach($result as $show)
 {
     echo $show['post_body'].'<br>';
 }
 ?>

http://www.oschina.net/code/snippet_591011_47258