mysql仿asp的数据库操作类

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<?php 
class MySQLDB 
  { 
    //MYSQL数据库操作类 
    //作者:熊毅 
    //版本:2.0(发行版)  
      查询数据时Query后可以用GetValue得到相应的值,既可以是字段名也可以是已0开始的序号 
插入新值,先用AddNew后使用SetValue相应的字段名或序号和字段值,在用Update添加 
编辑时用Edit指定编辑记录的条件在使用SetValue,最后用Update添加 
在类使用过程中,sTName记录上次使用的数据库表名,当指定后可以直接使用,以后的操作默认在该表  

    //可以自由转载,修改请通知我scxy78@yeah.net 
    //转载请保留以上声明 

        //上进行操作,当然也可以每次指定特殊的表进行操作 
    //nErr指示是否操作出错,sErr记录最后一次出错的错误代码,记录了明确的有哪个函数引起的错误 
    //错误之处请指正 
    //欢迎来信与我交流编程经验:scxy78@yeah.net 
    //我的CSDN:用户号:scxy;呢称:小熊,请多关照 

    //可以自由转载,修改请通知我scxy78@yeah.net 
    //转载请保留以上声明 

    var $host="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"); 
    } 
  } 
?>