mysql仿asp的数据库操作类

<"localhost";    //主机名 
  var $user="boot";      //用户名 
  var $password="oaserver";  //用户密码 
  var $linkid;         //连接值 
  var $dbid;          //数据库选择的结果值 
  var $sTName;         //指定当前操作的数据库表 
  var $sErr;          //错误代码 
  var $nErr;          //指示是否有错误存在,0无错误,1有错误 
  var $nResult;        //查询结果值 
  var $aFName;         //保存FieldsName的数组 
  var $nRows;         //查询结果中的行数 
  var $nCols;         //查询结果中的列数 
  var $aNew;          //添加在AddNew函数后的数据，以数组形式保存 
  var $NewEdit;         //判断当前是否在进行添加操作，0表示没有，1表示在进行添加,2表示编辑 
  var $sEditCon;        //指定编辑记录的条件 
  var $nOffset;        //记录偏移量 
  var $EOF;           //标记是否到记录集尾 
  var $sSQL;          //最后一条执行的SQL语句 

  //执行Update所要用到的全局变量 
  var $sName;          //字段名 
  var $sValue;         //字段值AddNew时用 
  var $sEdit;          //字段值Edit时用 

  function Initialize() 
  { 
   $this->nErr=0; 
   $this->NewEdit=0; 
   $this->nResult=-1; 
   $this->nCols=0; 
   $this->nRows=0; 
   $this->nOffset=0; 
   $this->EOF=true; 
   $this->sName=""; 
   $this->sValue="#@!"; 
   $this->sEdit="#@!"; 
   unset($this->aFName); 
   unset($this->aNew); 
  } 
  function MySqlDB($TableName="",$database="slt") //构造函数 
  { 
   $this->Initialize(); 
   $this->sTName=$TableName; 
   $this->linkid=mysql_connect($host,$user,$password); 
   if(!$this->linkid) 
   { 
    $this->nErr=1; 
    $this->sErr="MySqlDB:数据库连接出错，请启动服务!"; 
    return; 
   } 
   $this->dbid=mysql_select_db($database); 
   if(!$this->dbid) 
   { 
    $this->nErr=1; 
    $this->sErr="MySqlDB:选择的数据库".$database."不存在!"; 
    return; 
   } 
  } 

  function IsEmpty($Value) 
  { 
      if(is_string($Value)&&empty($Value)) 
        return true; 
      return false; 
  } 

  function Destroy()     //数据清除处理 
  { 
   mysql_query("commit"); 
   mysql_close(); 
  } 

  function PrintErr() 
  { 
   if($this->nErr==1) 
   { 
    echo($this->sErr."<br><br>"); 
   } 
   else 
   { 
    echo("没有错误<br><br>"); 
   } 
  } 

    function Execute($SQL) //直接执行SQL语句 
     { 
        if(empty($SQL)) 
         { 
            $this->nErr=1; 
            $this->sErr="Execute:执行语句不能为空！"; 
            return false; 
         } 
         $this->sSQL=$SQL; 
         if(!mysql_query($SQL)) 
         { 
             $this->nErr=1; 
             $this->sErr="Execute:SQL语句：".$SQL."<br>MySql错误：".mysql_error(); 
             return false; 
         } 
         return true; 
     } 

  function Query($TableName="",$SQL="*",$Condition="",$Order="",$Sequenc="") //在数据库里执行查询 
  { 
   $this->Initialize(); 
   if(!empty($TableName)) 
    $this->sTName=$TableName; 
   $strSQL="select ".$SQL." from ".$this->sTName; 
   if(!empty($Condition)) 
    $strSQL=$strSQL." where ".$Condition; 
   if(!empty($Order)) 
    $strSQL=$strSQL." order by ".$Order; 
   if(!empty($Sequenc)) 
    $strSQL=$strSQL." ".$Sequenc; 
     $this->sSQL=$strSQL; 
   if(!$this->nResult=mysql_query($strSQL)) 
   { 
    $this->nErr=1; 
    $this->sErr="Query:SQL语句：".$strSQL."<br>MySql错误：".mysql_error()."<br>"; 
    return; 
   } 
   $this->nOffset=0; 
   $this->nRows=mysql_num_rows($this->nResult); 
   $this->nCols=mysql_num_fields($this->nResult); 
     if($this->nRows>0) 
         $this->EOF=false; 
     else 
         $this->EOF=true; 
   unset($this->aFName); 
   $this->aFName=array(); 
   for($i=0;$i<$this->nCols;$i++) 
     $this->aFName[$i]=strtolower(mysql_field_name($this->nResult,$i)); 
  } 

    function MoveNext() 
     { 
        if($this->EOF) 
         { 
            $this->nErr=1; 
            $this->sErr="MoveNext:已经移到记录集末尾！"; 
            return; 
         } 
        $this->nOffset++; 
        if($this->nOffset>=$this->nRows) 
            $this->EOF=true; 
     } 

   function MoveTo($Offset) 
   { 
    if(empty($Offset)) 
    { 
     $this->nErr=1; 
     $this->sErr="MoveTo:必须指定偏移量! "; 
     return; 
    } 

    if(!$this->nResult) 
    { 
     $this->nErr=1; 
     $this->sErr="MoveTo:请先执行查询:Query"; 
     return; 
    } 
    $this->nOffset=$Offset; 
   } 

  //得到指定行的指定列的值，返回字符串 
  //如果不指定Offset将取得下一行的值 
  //如果不指定nFields将取得该行的值，并已数组形式返回 
  function GetValue($nFields=-1,$Offset=-1) 
  { 
   if($this->nResult==-1) 
   { 
    $this->nErr=1; 
    $this->sErr="GetValue:请先执行Query()函数！"; 
    return; 
   } 
   if($Offset>-1) 
   { 
        $this->nOffset=$Offset; 
    if($this->nOffset>=$this->nRows) 
    { 
     $this->nErr=1; 
     $this->sErr="GetValue:所要求的偏移量太大，无法达到！"; 
     return; 
    } 
   } 
      if(!@mysql_data_seek($this->nResult,$this->nOffset)) 
        { 
         $this->nErr=1; 
         $this->sErr="GetValue:请求不存在的记录！"; 
         return; 
        } 
   $aResult=mysql_fetch_row($this->nResult); 
   if(is_int($nFields)&&$nFields>-1) 
   { 
    if($nFileds>$this->nCols) 
    { 
     $this->nErr=1; 
     $this->sErr="GetValue:所请求的列值大于实际的列值！"; 
     return; 
    } 
    return $aResult[$nFields]; 
   } 
     if(is_string($nFields)) 
     { 
        $nFields=strtolower($nFields); 
      for($i=0;$i<$this->nCols;$i++) 
        { 
         if($this->aFName[$i]==$nFields) 
             break; 
        } 
        if($i==$this->nCols) 
         { 
            $this->nErr=1; 
            $this->sErr="GetValue:所请求的列不存在，请仔细检查！"; 
            return; 
         } 
         return $aResult[$i]; 
     } 
   return $aResult; 
  } 

  function AddNew($TableName="") //标志开始添加数据 
  { 
   $this->Initialize(); 
   if(!empty($TableName)) 
    $this->sTName=$TableName; 
   if($this->NewEdit>0) 
   { 
    $this->nErr=1; 
    $this->sErr="AddNew:你正在对数据库进行添加或更新操作！"; 
    return; 
   } 
   if(empty($this->sTName)) 
   { 
    $this->nErr=1; 
    $this->sErr="AddNew:想要添加的数据库表为空，可以在构造时指定，也可在AddNew()时指定！"; 
    return; 
   } 
   unset($this->aNew); 
   $this->aNew=array(); 
   $this->NewEdit=1; 
   $strSQL="select * from ".$this->sTName; 
     $this->sSQL=$strSQL; 
   if(!$this->nResult=mysql_query($strSQL)) 
   { 
    $this->nErr=1; 
    $this->sErr="AddNew:SQL语句：".strSQL."<br><br>MySql错误：".mysql_error(); 
    return; 
   } 
   $this->nCols=mysql_num_fields($this->nResult); 
   unset($this->aFName); 
   $this->aFName=array(); 
   for($i=0;$i<$this->nCols;$i++) 
     $this->aFName[$i]=strtolower(mysql_field_name($this->nResult,$i)); 
  } 

  function Edit($Condition="",$TableName="") //对指定数据库表进行编辑 
  { 
         $this->Initialize(); 
         if(!empty($TableName)) 
             $this->sTName=$TableName; 
         $this->sEditCon=$Condition; 
         if(empty($this->sTName)) 
         { 
             $this->nErr=1; 
             $this->sErr="Edit:在编辑前请先指定数据库表！"; 
             return; 
         } 
         unset($this->aNew); 
         $this->aNew=array(); 
         $this->NewEdit=2; 
         $strSQL="select * from ".$this->sTName; 
         $this->sSQL=$strSQL; 
         if(!$this->nResult=mysql_query($strSQL)) 
     { 
       $this->nErr=1; 
       $this->sErr="Edit:SQL语句：".strSQL."<br><br>MySql错误：".mysql_error(); 
       return; 
     } 
     $this->nCols=mysql_num_fields($this->nResult); 
     unset($this->aFName); 
     $this->aFName=array(); 
     for($i=0;$i<$this->nCols;$i++) 
       $this->aFName[$i]=strtolower(mysql_field_name($this->nResult,$i)); 
  } 

  function SetValue($Index,$Value) //指定数据，跟在AddNew后执行; 
  { 
       if($this->NewEdit==0) 
       { 
        $this->nErr=1; 
        $this->sErr="SetValue:请先执行AddNew()或者Edit()！"; 
        return; 
       } 
       if(is_int($Index)) 
       { 
         if($Index<0||$Index>$this->nCols) 
         { 
          $this->nErr=1; 
          $this->sErr="SetValue:插入不存在的列值！"; 
          return; 
         } 
         $this->aNew[$Index]=$Value; 
         $tmpIn=$Index; 
       } 
       elseif(is_string($Index)) 
       { 
        $Index=strtolower($Index); 
        for($i=0;$i<$this->nCols;$i++) 
        { 
          if($this->aFName[$i]==$Index) 
            break; 
        } 
        if($i==$this->nCols) 
        { 
          $this->nErr=1; 
          $this->sErr="SetValue:插入不存在的列值！"; 
          return; 
         } 
         $this->aNew[$i]=$Value; 
         $tmpIn=$i; 
       } 
         if(!empty($this->sName)) 
          $this->sName.=","; 
         $this->sName.=$this->aFName[$tmpIn]; 
         //根据当前字段的类型生成相应的新值 
         if($this->sValue!="#@!") 
          $this->sValue.=","; 
         else 
          $this->sValue=""; 
         $ftype=@mysql_field_type($this->nResult,$i); 
         //echo($ftype.",".$this->aNew[$i].",".$i.":".$sValue."<br>"); 
          
         switch($ftype) 
         { 
         case "string": 
         case "date": 
         case "datetime": 
            $this->sValue.=""".$this->aNew[$tmpIn]."""; 
            $this->sEdit=""".$this->aNew[$tmpIn]."""; 
            break; 
         case "int": 
         case "unknown": 
            $this->sValue.=$this->aNew[$tmpIn]; 
            $this->sEdit=$this->aNew[$tmpIn]; 
            break; 
         default: 
            $this->nErr=1; 
            $this->sErr="Update:字段名为".$this->aFName[$tmpIn]."的".$ftype."类型目前版本不支持，请用别的方法添加数据！"; 
            return; 
         } 

         if($this->NewEdit==2) 
          $this->sName.="=".$this->sEdit; 
   } 

  function Update()  //存储新值到数据库 
  { 
   $strSQL=""; 

   if($this->NewEdit==0) 
   { 
    $this->nErr=1; 
    $this->sErr="Update:请先执行AddNew()或者Edit()，再用SetValue()添加值！"; 
    return; 
   } 

   if(empty($this->sValue)) 
   { 
    $this->nErr=1; 
    $this->sErr="Update:在数据为空的情况下，不能添加或修改数据！"; 
    return; 
   } 

   switch($this->NewEdit) 
   { 
    case 1:    //添加 
      $strSQL="insert into "; 
      $strSQL.=$this->sTName; 
      $strSQL.=" (".$this->sName.") "; 
      $strSQL.="values (".$this->sValue.")"; 
      break; 
   case 2:     //修改 
      $strSQL="update "; 
      $strSQL.=$this->sTName; 
      $strSQL.=" set "; 
      $strSQL.=$this->sName; 
      if(!empty($this->sEditCon)) 
        $strSQL.=" where ".$this->sEditCon; 
      break; 
   default: 
      $this->nErr=1; 
      $this->sErr="Update:Update()生成SQL语句出错，请检查！"; 
      return; 
   } 

   $this->sSQL=$strSQL; 
   if(!$this->nResult=mysql_query($strSQL)) 
   { 
    $this->nErr=1; 
    $this->sErr="Update:SQL语句：".$strSQL."<br><br>MySql错误：".mysql_error(); 
    return; 
   } 
    //echo($this->sSQL."<br>"); 
   //作清理工作 
   $this->NewEdit=0; 
   unset($this->aNew); 
   mysql_query("commit"); 
  } 
 } 
?>