MYSQL的操作类

MYSQL的操作类



[复制到剪切板]
CODE:
<?php
class MySQLDB
  
{
    
//MYSQL数据库操作类
    //作者:熊毅
    //版本:2.0(发行版)
    
    //可以自由转载,修改请通知我[email protected]
    //转载请保留以上声明
    
    //使用说明:
    //该类完全按照ADO的习惯书写的,用过ASP的人都觉得ASP连接数据库比PHP好用(这是我的感觉),
    //但PHP得一个一个API地写,挺累,该类做了完全的封装
    //创建类的实例时可以指定一个数据库表和选择的数据库,如:new MySQLDB("table","database");
    //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
    //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:[email protected]
    //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[email protected]
    //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");
    }
  }
?> ;


如履薄冰

$this->

$this->

谢谢啊!

老大,有没有面向对象的数据库连接

我最近在网上看到的都是面向过程的,现在一般都用面向对象的,同时考虑到以后读写服务器的分离,优化的代码.

支持MYSQLI的类..

支持MYSQLI的类