Detaillierte Erläuterung der Beispiele für PHP-Zugriffsoperationsklassen

<?php     
--------------------------------------------------------------------     
//FileName:class.php     
//Summary: Access数据库操作类     
//Author:  forest     
//CreateTime: 2006-8-10          
//LastModifed:     
//copyright (c)2006      
//http://freeweb.nyist.net/~chairy       
//[email]chaizuxue@163.com[/email]     
//   使用范例：     
//$databasepath="database.mdb";     
//$dbusername="";     
//$dbpassword="";     
//include_once("class.php");     
//$access=new Access($databasepath,$dbusername,$dbpassword);     

--------------------------------------------------------------------     
    class Access     
    {     
         var $databasepath,$constr,$dbusername,$dbpassword,$link;     
         function Access($databasepath,$dbusername,$dbpassword)     
         {     
               $this->databasepath=$databasepath;     
        $this->username=$dbusername;     
        $this->password=$dbpassword;     
        $this->connect();     
          }     

    function connect()     
    {     
        $this->constr="DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" . realpath($this->databasepath);      
        $this->link=odbc_connect($this->constr,$this->username,$this->password,SQL_CUR_USE_ODBC);     
        return $this->link;     
        //if($this->link) echo "恭喜你,数据库连接成功!";     
        //else echo "数据库连接失败!";     
    }     

    function query($sql)     
    {     
        return @odbc_exec($this->link,$sql);     
    }     

    function first_array($sql)     
    {     
        return odbc_fetch_array($this->query($sql));     
    }     

    function fetch_row($query)     
    {     
        return odbc_fetch_row($query);     
    }     

    function total_num($sql)//取得记录总数     
    {     
        return odbc_num_rows($this->query($sql));     
    }     

    function close()//关闭数据库连接函数     
    {         
        odbc_close($this->link);     
    }     

    function insert($table,$field)//插入记录函数     
    {     
        $temp=explode(&#39;,&#39;,$field);     
        $ins=&#39;&#39;;     
        for ($i=0;$i<count($temp);$i++)     
        {     
            $ins.="&#39;".$_POST[$temp[$i]]."&#39;,";     
        }     
        $ins=substr($ins,0,-1);     
        $sql="INSERT INTO ".$table." (".$field.") VALUES (".$ins.")";     
        $this->query($sql);     
    }     

    function getinfo($table,$field,$id,$colnum)//取得当条记录详细信息     
    {     
        $sql="SELECT * FROM ".$table." WHERE ".$field."=".$id."";     
        $query=$this->query($sql);     
        if($this->fetch_row($query))     
        {     
            for ($i=1;$i<$colnum;$i++)     
            {     
          $info[$i]=odbc_result($query,$i);     
             }     
         }     
         return $info;     
    }     

    function getlist($table,$field,$colnum,$condition,$sort="ORDER BY id DESC")//取得记录列表         
    {     
         $sql="SELECT * FROM ".$table." ".$condition." ".$sort;     
         $query=$this->query($sql);     
         $i=0;     
         while ($this->fetch_row($query))      
         {     
        $recordlist[$i]=getinfo($table,$field,odbc_result($query,1),$colnum);     
        $i++;     
          }     
          return $recordlist;     
    }     

    function getfieldlist($table,$field,$fieldnum,$condition="",$sort="")//取得记录列表     
    {     
         $sql="SELECT ".$field." FROM ".$table." ".$condition." ".$sort;     
         $query=$this->query($sql);     
         $i=0;     
         while ($this->fetch_row($query))      
         {     
         for ($j=0;$j<$fieldnum;$j++)     
        {     
                   $info[$j]=odbc_result($query,$j+1);     
        }         
        $rdlist[$i]=$info;     
        $i++;     
         }     
         return $rdlist;     
    }     

    function updateinfo($table,$field,$id,$set)//更新记录     
    {     
        $sql="UPDATE ".$table." SET ".$set." WHERE ".$field."=".$id;     
        $this->query($sql);     
    }     

    function deleteinfo($table,$field,$id)//删除记录     
    {     
         $sql="DELETE FROM ".$table." WHERE ".$field."=".$id;     
         $this->query($sql);     
    }     

    function deleterecord($table,$condition)//删除指定条件的记录     
    {     
         $sql="DELETE FROM ".$table." WHERE ".$condition;     
         $this->query($sql);     
    }     

    function getcondrecord($table,$condition="")// 取得指定条件的记录数     
    {     
         $sql="SELECT COUNT(*) AS num FROM ".$table." ".$condition;     
         $query=$this->query($sql);     
         $this->fetch_row($query);     
         $num=odbc_result($query,1);     
         return $num;                 
    }     
     }     
?>