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php-数据库类封装

Jun 23, 2016 pm 01:57 PM
encapsulation database

为了节省以后的时间,今天封装了操作sql语句的一个类,在此保存起来,方面以后使用。

这个类的文件名:SqlTool.class.php

主要有dql和dml两个函数

看下面的源码“

<?php class SqlTool{      private $conn;      private $username="root";      private $password="1234";      private $host="127.0.0.1";      private $db="test";          function SqlTool(){        $this->conn=mysql_connect($this->host,$this->username,$this->password);        if(!$this->conn)        {            die  ("连接失败".mysql_error($this.conn));        }        mysql_select_db($this->db,$this->conn);        mysql_query("set names utf8");     }          //完成select     function execute_dql($sql)     {        $result = mysql_query($sql,$this->conn);        $arrTemp = array();        $counter = 0;        while($row = mysql_fetch_assoc($result))        {         $arrTemp[$counter] = $row;          $counter++;        }        mysql_free_result($result);        mysql_close($this->conn);                return json_encode($arrTemp);     }          //完成dml     public  function execute_dml($sql)     {        $res=mysql_query($sql,$this->conn);        if(!$res)        {            return 0; //执行失败        }         else        {            if(mysql_affected_rows($this->conn)>0)            {                 return 1;  //执行成功            }             else            {                return 2; //没有行数收到影响            }        }             }   } ?>
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  演示一下使用方法:

<?php @header("content-Type:text/html;charset:utf-8");   require_once "SqlTool.class.php";  $sqlStr = "insert into student(number,name,age) values('200911230','huzhuxi','45');";  $sqlTool = new SqlTool();  $result1=$sqlTool->execute_dml($sqlStr);  echo "结果为:".$result1."<br>";    $sqlStr1 = "select * from student";  $resultStr = $sqlTool->execute_dql($sqlStr1);  echo "当前数据:<br>".$resultStr;?>
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