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php面象对象数据库操作类实例,php实例

本文实例讲述了php面象对象数据库操作类。分享给大家供大家参考。

具体实现代码如下:

复制代码 代码如下:

//此处构造一个数据库操作类,封装所有数据库操作
//可以扩展便于后台管理程序的使用
Class MySQLDB 

   var $host; 
   var $user; 
   var $passwd; 
   var $database;
   var $conn; 
 
   //利用构造函数实现变量初始化 
   //同时连接数据库操作
   function MySQLDB($host,$user,$password,$database) 
   { 
      $this->host = $host; 
      $this->user = $user; 
      $this->passwd = $password; 
      $this->database = $database; 
      $this->conn=mysql_connect($this->host, $this->user,$this->passwd) or 
     die("Could not connect to $this->host"); 
      mysql_select_db($this->database,$this->conn) or 
     die("Could not switch to database $this->database"); 
   } 
 
   //该函数用来关闭数据库连接
   function Close() 
   { 
      MySQL_close($this->conn); 
   } 
 
   //该函数实现数据库查询操作
   function Query($queryStr) 
   { 
      $res =Mysql_query($queryStr, $this->conn) or 
      die("Could not query database"); 
      return $res; 
   } 
 
   //该函数返回记录集
   function getRows($res) 
   { 
      $rowno = 0; 
      $rowno = MySQL_num_rows($res); 
      if($rowno>0) 
      { 
         for($row=0;$row          { 
            $rows[$row]=MySQL_fetch_array($res);
            //本来为MySQL_fetch_row,但是不能以数组的方式来提取,只能用索引
            //这样可以用索引和名称,更为方便
         } 
         return $rows; 
      } 
    } 
 
    //该函数取回数据库记录数
    function getRowsNum($res) 
    { 
       $rowno = 0; 
       $rowno = mysql_num_rows($res); 
       return $rowno;
    } 
 
 //该函数返回数据库表字段数
 function getFieldsNum($res)
 {
    $fieldno = 0;
    $fieldno = mysql_num_fields($res);
    return $fieldno;
 }
 
 //该函数返回数据库表字段名称集
 function getFields($res)
 {
      $fno = $this->getFieldsNum($res);
      if($fno>0) 
      { 
         for($i=0;$i          { 
            $fs[$i]=MySQL_field_name($res,$i);//取第i个字段的名称
         } 
         return $fs;
      } 
 }

 
//使用时直接require该文件,然后实例化:
 
$SqlDB = new MySQLDB("localhost","root","root","testdb");
 
$sql = "select * from tableX...";
 
$result = $SqlDB->Query($sql);//查询
 
$rs = $SqlDB->getRows($result);//获得记录集
 
$num = $SqlDB->getRowsNum($result);//获得记录数
 
...剩下的操作就是循环取值,
 
for($i=0;$i    echo($rs[$i]["字段名"]);
}
 
...


最后不要忘记关闭数据路连接

复制代码 代码如下:

$SqlDB->Close();

当然这句可以不要,php会自动注销!但是这样能够养成一个好的习惯,最好还是加上!其他自己类推。

希望本文所述对大家的PHP程序设计有所帮助。

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