php mysql数据库类(兼容php4与php5)

本文介绍下，php实现的mysql数据库操作类，此类的特点是可以兼容php4与php5，值得学习借鉴。有需要的朋友参考下吧。

分享一个php与mysql数据库类，良好的兼容了php4与php5。 代码如下：

Id = false; 
        $this->Mode = 1; // 0=silent, 1=normal, 2=debug, 3=trace 
        // Try to connect when instance is created 
        if ($srv!=='') $this->Connect($srv,$uid,$pwd,$db,$drv); 
        $this->_Dbs_Prepare(); 
        // Hook for the TinyButStrong Template Engine 
        $GLOBALS['_TBS_UserFctLst']['k:tbssql'] = array('type'=>4,'open'=>array(&$this,'_Dbs_RsOpen'),'fetch'=>array(&$this,'_Dbs_RsFetch'),
'close'=>array(&$this,'_Dbs_RsClose')); 
    } 

// Public methods 
     
    function Connect($srv,$uid,$pwd,$db,$drv='') { 
        $this->Id = $this->_Dbs_Connect($srv,$uid,$pwd,$db,$drv); 
      if ($this->Id===false) return $this->_SqlError(false); 
        return true; 
    } 

    function Close() { 
        if ($this->Id!==false) $this->_Dbs_Close(); 
    } 

    function Execute($Sql) { 

        $ArgLst = func_get_args(); 
        $this->_SqlProtect($Sql,$ArgLst,1); 
        $RsId = $this->_Dbs_RsOpen(null,$Sql); 
        if ($RsId===false) return $this->_SqlError($this->Id); 

        $this->_Dbs_RsClose($RsId); 
        return true; 

    } 

    function Value($DefVal,$Sql) { 

        $ArgLst = func_get_args(); 
        $this->_SqlProtect($Sql,$ArgLst,2); 
        $RsId = $this->_Dbs_RsOpen(null,$Sql); 
        if ($RsId===false) return $this->_SqlError($this->Id); 

        $Row = $this->_Dbs_RsFetch($RsId); 
        if ($Row===false) { 
            $x = $DefVal; 
        } else { 
            $x = reset($Row); 
        } 

        $this->_Dbs_RsClose($RsId); 
        return $x; 

    } 

    function Row1($Sql) { 

        $ArgLst = func_get_args(); 
        $this->_SqlProtect($Sql,$ArgLst,1); 
        $RsId = $this->_Dbs_RsOpen(null,$Sql); 
        if ($RsId===false) return $this->_SqlError($this->Id); 

        $x = $this->_Dbs_RsFetch($RsId); 

        $this->_Dbs_RsClose($RsId); 
        return $x; 

    } 

    function Rows($Sql) { 
         
        $ArgLst = func_get_args(); 
        $this->_SqlProtect($Sql,$ArgLst,1); 
        $RsId = $this->_Dbs_RsOpen(null,$Sql); 
        if ($RsId===false) return $this->_SqlError($this->Id); 

        $x = array(); 
        while ($r = $this->_Dbs_RsFetch($RsId)) { 
            $x[] = $r; 
        } 

        $this->_Dbs_RsClose($RsId); 
        return $x; 

    } 

    function AffectedRows() { 
        return $this->_Dbs_AffectedRows(); 
    } 

    function LastRowId() { 
        return $this->_Dbs_LastRowId(); 
    } 

// Private methods 

    function _SqlError($ObjId) { 
        if ($this->Mode==0) return; 
        $x =  'Database error message: '.$this->_Dbs_Error($ObjId); 
        if ($this->Mode==2) $x .= "\r\nSQL = ".$this->LastSql; 
        $this->_SqlMsg($x); 
        return false; 
    } 

    function _SqlMsg($Txt,$Color='#FF0000') { 
        if ($this->Mode!=0) { 
            echo '
[TbsSql] '.nl2br(htmlentities($Txt)).'
'."\r\n"; 
            flush(); 
        } 
    } 
     
    function _SqlDate($Date,$Mode) { 
        // Return the date formated for the current Database 
        if (is_string($Date)) { 
            $x = strtotime($Date); 
            if (($x===-1) or ($x===false)) { 
                // display error message 
                $this->_SqlMsg('Date value not recognized: '.$Date); 
                $Mode = 0; // Try with the string mode 
                $x = $Date; 
            } 
        } else { 
            $x = $Date; 
        } 
        return $this->_Dbs_Date($x,$Mode); 
    } 
     
    function _SqlProtect(&$Sql,&$ArgLst,$IdxStart) { 
    // Replace all %i% and @i@ figures by corresponding protected values 
        $IdxMax = count($ArgLst) - 1; 
        for ($i=$IdxStart;$i_Dbs_ProtectStr(''.$ArgLst[$i]); 
                $Sql = str_replace($tag,$x,$Sql) ; 
            } 
            // String value 
            $tag = '@'.$n.'@'; 
            if (strpos($Sql,$tag)!==false) { 
                $x = '\''.$this->_Dbs_ProtectStr(''.$ArgLst[$i]).'\''; 
                $Sql = str_replace($tag,$x,$Sql) ; 
            } 
            // Date value 
            $tag = '#'.$n.'#'; 
            if (strpos($Sql,$tag)!==false) { 
                $x = $this->_SqlDate($ArgLst[$i],1); 
                $Sql = str_replace($tag,$x,$Sql) ; 
            } 
            // Date and time value 
            $tag = '~'.$n.'~'; 
            if (strpos($Sql,$tag)!==false) { 
                $x = $this->_SqlDate($ArgLst[$i],2); 
                $Sql = str_replace($tag,$x,$Sql) ; 
            } 
        } 
        if ($this->Mode==2) { 
            $this->LastSql = $Sql; 
        } elseif ($this->Mode==3) { 
            $this->_SqlMsg('Trace SQL: '.$Sql,'#663399'); 
        } 
    } 

// ------------------------------- 
// 指定数据库系统
// ------------------------------- 

// Database Engine: MySQL  
// Version 1.02
     
    function _Dbs_Prepare() { 
        if (@mysql_ping()) { // Check if a MySQL connection already exist 
            $this->Id = true; 
        } 
    } 

    function _Dbs_Connect($srv,$uid,$pwd,$db,$drv) { 
        $Id = @mysql_connect($srv,$uid,$pwd); 
        if (($Id!==false) and ($db!=='')) { 
            if (!@mysql_select_db($db)) $this->_SqlError(false); 
        } 
        return $Id; 
    } 

    function _Dbs_Close() { 
        if (is_resource($this->Id)) { 
            return @mysql_close($this->Id); 
        } else { 
            return @mysql_close(); 
        } 
    } 

    function _Dbs_Error($ObjId) { 
        if (is_resource($this->Id)) { 
            return @mysql_error($ObjId); 
        } else { 
            return @mysql_error(); 
        } 
    } 
     
    function _Dbs_RsOpen($Src,$Sql) { 
    // $Src is only for compatibility with TinyButStrong 
        if (is_resource($this->Id)) { 
            return @mysql_query($Sql,$this->Id); 
        } else { 
            return @mysql_query($Sql); 
        } 
    } 

    function _Dbs_RsFetch(&$RsId) { 
        return mysql_fetch_assoc($RsId); 
    } 

    function _Dbs_RsClose(&$RsId) { 
        if ($RsId===true)  return true; 
        return @mysql_free_result($RsId); 
    } 
     
    function _Dbs_ProtectStr($Txt) { 
        return mysql_real_escape_string($Txt); 
    } 
     
    function _Dbs_Date($Timestamp,$Mode) { 
        switch ($Mode) { 
        case 1: 
            // Date only 
            return '\''.date('Y-m-d',$Timestamp).'\''; 
        case 2: 
            // Date and time 
            return '\''.date('Y-m-d H:i:s',$Timestamp).'\''; 
        case 0: 
            // Value is a string 
            return '\''.$this->_Dbs_ProtectStr($Timestamp).'\''; 
        default: 
            // Error in date recognization 
            return '\'0000-00-00\''; 
        }   
    } 

    function _Dbs_LastRowId() { 
        return $this->Value(false,'SELECT LAST_INSERT_ID()'); 
    } 
     
    function _Dbs_AffectedRows() { 
        if (is_resource($this->Id)) { 
            return mysql_affected_rows($this->Id); 
        } else { 
            return mysql_affected_rows(); 
        }         
    }
}
?> 

这是小编见过的，相当牛X的一个mysql数据库类了，如果你有幸阅读读了这里，那么恭喜您。 在以后的php与mysql数据库操作方面，您即将成为高手了。