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mysql仿asp的數據庫操作類

2024-07-24 13:04:35
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CODE:[復制到剪切板]<?php
class MySQLDB
  {
    //MYSQL數據庫操作類
    //作者:熊毅
    //版本:2.0(發行版)

    //可以自由轉載,修改請通知我scxy78@yeah.net
    //轉載請保留以上聲明 

        //上進行操作,當然也可以每次指定特殊的表進行操作
    //nErr指示是否操作出錯,sErr記錄最后一次出錯的錯誤代碼,記錄了明確的有哪個函數引起的錯誤
    //錯誤之處請指正
    //歡迎來信與我交流編程經驗:scxy78@yeah.net
    //我的CSDN:用戶號:scxy;呢稱:小熊,請多關照

    //可以自由轉載,修改請通知我scxy78@yeah.net
    //轉載請保留以上聲明

    var $host="localhost";        //主機名
    var $user="boot";           //用戶名
    var $password="oaserver";   //用戶密碼
    var $linkid;                 //連接值
    var $dbid;                   //數據庫選擇的結果值
    var $sTName;                  //指定當前操作的數據庫表
    var $sErr;                   //錯誤代碼
    var $nErr;                   //指示是否有錯誤存在,0無錯誤,1有錯誤
    var $nResult;                //查詢結果值
    var $aFName;                 //保存FieldsName的數組
    var $nRows;                  //查詢結果中的行數
    var $nCols;                  //查詢結果中的列數
    var $aNew;                   //添加在AddNew函數后的數據,以數組形式保存
    var $NewEdit;                  //判斷當前是否在進行添加操作,0表示沒有,1表示在進行添加,2表示編輯
    var $sEditCon;               //指定編輯記錄的條件
    var $nOffset;                //記錄偏移量
    var $EOF;                     //標記是否到記錄集尾
    var $sSQL;                    //最后一條執行的SQL語句

    //執行Update所要用到的全局變量
    var $sName;                   //字段名
    var $sValue;                  //字段值AddNew時用
    var $sEdit;                   //字段值Edit時用

    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")  //構造函數
    {
      $this->Initialize();
      $this->sTName=$TableName;
      $this->linkid=mysql_connect($host,$user,$password);
      if(!$this->linkid)
      {
        $this->nErr=1;
        $this->sErr="MySqlDB:數據庫連接出錯,請啟動服務!";
        return;
      }
      $this->dbid=mysql_select_db($database);
      if(!$this->dbid)
      {
        $this->nErr=1;
        $this->sErr="MySqlDB:選擇的數據庫".$database."不存在!";
        return;
      }
    }

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

    function Destroy()          //數據清除處理
    {
      mysql_query("commit");
      mysql_close();
    }

    function PrintErr()
    {
      if($this->nErr==1)
      {
        echo($this->sErr."<br><br>");
      }
      else
      {
        echo("沒有錯誤<br><br>");
      }
    }

        function Execute($SQL)  //直接執行SQL語句
          {
                if(empty($SQL))
                  {
                        $this->nErr=1;
                        $this->sErr="Execute:執行語句不能為空!";
                        return false;
                  }
                 $this->sSQL=$SQL;
                  if(!mysql_query($SQL))
                  {
                          $this->nErr=1;
                          $this->sErr="Execute:SQL語句:".$SQL."<br>MySql錯誤:".mysql_error();
                          return false;
                  }
                  return true;
          }

    function Query($TableName="",$SQL="*",$Condition="",$Order="",$Sequenc="") //在數據庫里執行查詢
    {
      $this->Initialize();
      if(!empty($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;
        $this->sErr="Query:SQL語句:".$strSQL."<br>MySql錯誤:".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:已經移到記錄集末尾!";
                        return;
                  }
                $this->nOffset++;
                if($this->nOffset>=$this->nRows)
                        $this->EOF=true;
          }

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

        if(!$this->nResult)
        {
          $this->nErr=1;
          $this->sErr="MoveTo:請先執行查詢: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將取得下一行的值
    //如果不指定nFields將取得該行的值,并已數組形式返回
    function GetValue($nFields=-1,$Offset=-1)
    {
      if($this->nResult==-1)
      {
        $this->nErr=1;
        $this->sErr="GetValue:請先執行Query()函數!";
        return;
      }
      if($Offset>-1)
      {
                $this->nOffset=$Offset;
        if($this->nOffset>=$this->nRows)
        {
          $this->nErr=1;
          $this->sErr="GetValue:所要求的偏移量太大,無法達到!";
          return;
        }
      }
           if(!@mysql_data_seek($this->nResult,$this->nOffset))
                {
                  $this->nErr=1;
                  $this->sErr="GetValue:請求不存在的記錄!";
                  return;
                }
      $aResult=mysql_fetch_row($this->nResult);
      if(is_int($nFields)&&$nFields>-1)
      {
        if($nFileds>$this->nCols)
        {
          $this->nErr=1;
          $this->sErr="GetValue:所請求的列值大于實際的列值!";
          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:所請求的列不存在,請仔細檢查!";
                        return;
                  }
                  return $aResult[$i];
          }
      return $aResult;
    }

    function AddNew($TableName="")  //標志開始添加數據
    {
      $this->Initialize();
      if(!empty($TableName))
        $this->sTName=$TableName;
      if($this->NewEdit>0)
      {
        $this->nErr=1;
        $this->sErr="AddNew:你正在對數據庫進行添加或更新操作!";
        return;
      }
      if(empty($this->sTName))
      {
        $this->nErr=1;
        $this->sErr="AddNew:想要添加的數據庫表為空,可以在構造時指定,也可在AddNew()時指定!";
        return;
      }
      unset($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語句:".strSQL."<br><br>MySql錯誤:".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="")  //對指定數據庫表進行編輯
    {
                  $this->Initialize();
                  if(!empty($TableName))
                          $this->sTName=$TableName;
                  $this->sEditCon=$Condition;
                  if(empty($this->sTName))
                  {
                          $this->nErr=1;
                          $this->sErr="Edit:在編輯前請先指定數據庫表!";
                          return;
                  }
                  unset($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語句:".strSQL."<br><br>MySql錯誤:".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) //指定數據,跟在AddNew后執行;
    {
             if($this->NewEdit==0)
             {
                $this->nErr=1;
                $this->sErr="SetValue:請先執行AddNew()或者Edit()!";
                return;
             }
             if(is_int($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[$tmpIn];
                 //根據當前字段的類型生成相應的新值
                 if($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;
                       $this->sErr="Update:字段名為".$this->aFName[$tmpIn]."的".$ftype."類型目前版本不支持,請用別的方法添加數據!";
                       return;
                 }

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

    function Update()    //存儲新值到數據庫
    {
      $strSQL="";

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

      if(empty($this->sValue))
      {
        $this->nErr=1;
        $this->sErr="Update:在數據為空的情況下,不能添加或修改數據!";
        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語句出錯,請檢查!";
           return;
      }

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