分享一个自己写的php操作mysql数据库的类

这是我自己写的一个类，欢迎大家讨论指导
部分使用方法：
//声明数据库对象
$Conn = new Mysql;
//加载数据库参数
$Conn->Parameter(数据库服务器, 数据库用户名, 数据库密码, 数据库名称, 数据库编码, 数据库表前缀[可为空]);

上面的代码就已经加载这个类文件进来了，并且初始化了一些数据库连接参数！
下面介绍几个基本是方法函数：
1、 $Conn -> Table();
选择数据表，参数是数据表名称
2、$Conn -> Field();
选择的字段名称，多个用逗号隔开，如不调用这个方法，则返回全部
3、$Conn -> Where();
Sql Where子语句，根据条件筛选
4、$Conn -> Order();
Sql 排序
5、$Conn -> Page(int);
参数是一个正整数数字，如调用这个方法，记录将分页显示
6、$Conn -> Select(布尔值);
执行查询，返回查询结果，如果有，则是一个二维数组，如果无，则返回假，参数可省略，如省略，默认为真，返回的数组包含数字元素
7、$Conn -> Del();
删除记录
8、 $Conn -> Edit(array());
修改记录，参数是一个一维数组，数组键是字段名称，数组值是字段值
9、$Conn -> Into(array());
添加记录，参数是一个一维数组，数组键是字段名称，数组值是字段值。

以上方法可连续调用，比如：

$Rult = $Conn -> Table('user') -> Select(); //查询返回user表的所有记录
$Rult = $Conn -> Table('user') -> Page(20) -> Select();//查询返回user表的所有记录，并分页显示，每页20条；

  还有很多方法调用和诀窍，以后有空再慢慢细说！

<?php
/*

   数据库操作类
	   操作方式：面对对象
	   制作时间：2013-3-10
	   当前版本：BqhMysql(mysqli)1.0.1
	   软件作者：伤心的歌
	   联系QQ ：36975
	   联系电话：18907975647
	   电子邮件：admin@q128.com
	   联系地址：江西省赣州市石城县小松镇
       邮政编码：342706

*/
class Mysql{
	private $LocalHost = 'localhost';
	private $LoaclUser = 'root';
	private $LocalPass = '123456';
	private $LocalBase = 'jiangxibaiyi';
	private $LocalCode = 'UTF8';
	private $PreFix;
	private $Conn;
	private $Start     = 0;
	private $Error     = false; //数据库连接状态, false表示未连接或连接不正常
	public  $Err       = true;  //Sql执行结果
	
	private $Table;
	private $Field     = '*';
	private $Where     = '';
	private $Order     = '';
	
	private $PageSize  = 0; //分页显示->每页多少条，0为不分页显示
	private $PageCount = 1; //分页显示->总共有多少条
	private $PageNum   = 1; //分页显示->总共有多少页
	private $PageNo    = 1; //分页显示->当前第几页
	private $PageKey   = 'page'; //分页url参数键
	private $PageStart = 0; //分页显示->当前从第几条开始返回
	
	
	private $Select;
	private $Rest;
	
	private $Result    = false;//结果集
	
	public $FormArray = array();
	
	public $Instr_ID  = 0;
	private $j =  0;
	
	
	public function Parameter($Loca, $Root, $Pass, $Base, $Code, $PreFix = ''){
		$this->LoaclUser = $Root;
		$this->LocalBase = $Base;
		$this->LocalCode = $Code;
		$this->LocalHost = $Loca;
		$this->LocalPass = $Pass;
		$this->PreFix    = $PreFix;
		return $this;
	}
	private function Connection( $Sql ){
		!function_exists(mysqli_connect) ? die('查询失败，无法加载mysqli扩展') : null;
		$this->Conn = @new mysqli( $this->LocalHost, $this->LoaclUser, $this->LocalPass, $this->LocalBase);
		$this->Error = mysqli_connect_errno() == 0 ? true : false;
		!$this->Error ? die('数据库连接错误，请检查数据库连接参数') : null;
		$this->Conn->query('SET NAMES ' . $this->LocalCode);
		$this->Rest = $this->Conn->query($Sql);
		$this->Err  = mysqli_error($this->Conn);
		$this->Instr_ID = mysqli_insert_id($this->Conn);
		$this->Rest->free_result;
		$this->Conn->close;
		$this -> FormArray = '';
		return $this;
	}
	
	public function null(){
		$this->PageSize  = 0;
		//$this->PageCount = 1;
		$this->PageStart = 1;
		$this->Field     = ' * ';
	    $this->Select    = '';
		unset($this->Table, $this->Where,$this->Order, $this->Result);
	}
	
	public function Table( $TableName ) {//数据表
	  $this -> null();
	  $this->Table = '`' . $this->PreFix . $TableName . '`';
	  return $this;
	}
	
	public function Field( $Array = '*' ) {//数据字段
	  !empty( $this->Field ) ? $this->Field = '' : null;
	  $Array = explode(',', $Array);
	  foreach ( $Array as $field ) {
		 $this->Field .= !$this->Start ? '`' . $field . '`' :  ', `' . $field . '`';
		 $this->Start++;
	  }
	  $this->Start = 0;
	  return $this;
	}
	
	public function Where( $Where ) {//条件
       $this->Where = ' where ' .$Where;
	   return $this; 
	}
	
	public function Order( $Order ) {//排序
	  $this->Order = ' order by ' . $Order;
	  return $this;
	}
	
	public function pk( $key ) {//分页url参数键
	  $this->PageKey = $key;
	  return $this;
	}
	
	public function Page( $PageSize ) {//分页
	  $this->PageSize = $PageSize;
	  $this->PageNo   = $this->get( $this->PageKey );
	  $this->PageNo   = empty( $this->PageNo ) || !isset( $this->PageNo ) || !is_numeric( $this->PageNo ) || $this->PageNo < 1 ? 1 : $this->PageNo;
	  return $this;
	}
	
	public function post( $Key, $Filter = true ){
		return $Filter ? strip_tags($_POST[$Key]) : $_POST[$Key];
	}
	
	public function get( $Key, $Filter = true ){
		return $Filter ? strip_tags($_GET[$Key]) : $_GET[$Key];
	}
	
	public function Sel(){
		$this->Select = 'Select ' . $this->Field . ' from ' . $this->Table . $this->Where . $this->Order;
		$this->Connection( $this->Select );
		if ( $this->Rest->num_rows ) {
		 while ( $Rs = $this->Rest->fetch_assoc() ) {
			  $this->Result[] = $Rs;
		  }
		}
	   $DataBase = $this->Result;
	   return empty($DataBase) ? false : $DataBase;
	}
	
	public function querys( $Sql = '', $Type = 'not', $biao = false ) {
		$this->Select = $Sql;
		$this->Connection( $this->Select );
		if ( $this->Rest->num_rows ) {
	    if ( !$biao ) {
		 while ( $Rs = $this->Rest->fetch_array() ) {
			  $this->Result[] = !preg_match('/^\d+$/i', $Type) ?  $Rs : $Rs[ $Type ];
		  }
		} else {
		 while ( $Rs = $this->Rest->fetch_assoc() ) {
			  $this->Result[] = $Rs;
		  }
		}
		}
	   $DataBase = $this->Result;
	   return empty($DataBase) ? false : $DataBase;
		
	}
	
	public function executes( $Sql = '' ){
		$this->Connection( $Sql  );
		return $this->Rest;
	}
	
	
	public function exists( $T = '', $F = '', $W = ''){
		if ( empty( $F ) ) { return 0; }
		$cmd = empty( $W ) ? 'Select sum(' . $F . ') as `baiyinum` from `' . $this->PreFix . $T .'`' : 'Select sum(' . $F . ') as `baiyinum` from `' . $this->PreFix . $T .'` Where ' . $W;
        $this->Connection( $cmd );
		unset( $T, $F, $W, $cmd );
		$Rel =  $this->Rest->fetch_array();
		return round( $Rel['baiyinum'], 2 );
	}
	
	
	public function ExistsTo( $Bili = 10000, $T = '', $F = '', $W = ''){
		if ( empty( $F ) ) { return 0; }
		$cmd = empty( $W ) ? 'Select sum(' . $F . ') as `baiyinum` from `' . $this->PreFix . $T .'`' : 'Select sum(' . $F . ') as `baiyinum` from `' . $this->PreFix . $T .'` Where ' . $W;
        $this->Connection( $cmd );
		unset( $T, $F, $W, $cmd );
		$Rel =  $this->Rest->fetch_array();
		return round( $Rel['baiyinum'] * $Bili );
	}
	
	
	public function Select( $Type = true, $ListNum = 1 ){ //返回记录（数组形式， 返回条数）
	  $this->Select = 'Select ' . $this->Field . ' from ' . $this->Table . $this->Where . $this->Order;
	  if ( is_numeric( $ListNum ) ) { 
		if ( $this->PageSize > 0 ) {
			$this->Connection( $this->Select );//执行查询
			$this->PageCount =  $this->Rest->num_rows;//取得记录总数
			$this->PageNum   =  ceil($this->PageCount / $this->PageSize); //总共有多少页
			$this->PageNo    = $this->PageNo > $this->PageNum ? $this->PageNum : $this->PageNo;
			$this->PageStart = ( $this->PageNo - 1 ) * $this->PageSize;   //当前从第几条开始返回
			$this->Select   .= ' limit ' . $this->PageStart . ', ' .$this->PageSize; //重新构造sql语句
		} else {
			$this->Select   .= ' limit ' . $ListNum; //重新构造sql语句
		}
	  } else {
			$this->Select   .= ' limit 1'; //重新构造sql语句
	  }
	  //echo $this->Select;
	  $this->Connection( $this->Select );//再次执行查询
	  if ( $this->Rest->num_rows ) {//如果记录存在
		if ( $Type ) {
		  while ( $Rs = $this->Rest->fetch_array() ) {
			  $this->Result[] = $Rs;
		  }
		}else{
		  while ( $Rs = $this->Rest->fetch_assoc() ) {
			  $this->Result[] = $Rs;
		  }
		}
	  }
	  if ( ( $ListNum == 1 or !is_numeric( $ListNum ) ) && !$this->PageSize) { $this->Result = $this->Result[0]; }
	  $DataBase = $this->Result;
	  return empty($DataBase) ? false : $DataBase;
	}
	
   public function Num() { //返回记录总数
     $this->Select = 'Select ' . $this->Field . ' from ' . $this->Table . $this->Where . $this->Order;
	 $this->Connection( $this->Select );//执行查询
	 return $this->Rest->num_rows;//取得记录总数
   }
   
   public function PageNav($NumNav = false ) {  //分页
	 $Action = $this -> get('action');
	 !empty( $Action ) or $Action =  'index';
	 $Module = $this -> get('module');
	 !empty( $Module ) or $Module = 'index';
	 $NavUrl   = '/' . $Module . '/' . $Action . '/' . $this -> PageKey .'/';
	 $NaIndex  = '/' . $Module . '/' . $Action;
	 $PageHtml = "\n<div class=\"pagenav\">";
	 $PageHtml .= '<span>' . $this->PageCount . '条记录        ' . $this->PageNo . '/' . $this->PageNum . '页</span>            ';
	 $this->PageNo <= 1 or $PageHtml .= "<a href=\"" . $NaIndex . "\">首页</a>\n<a href=\"" .  $NavUrl . ($this->PageNo - 1) . "\">上一页</a>\n";
	if ( $NumNav ) { $PageHtml .= $this->NumPage($NavUrl); }
	$this->PageNo >= $this->PageNum or $PageHtml .= "<a href=\"" . $NavUrl. ($this->PageNo + 1) .  "\">下一页</a>\n<a href=\"" . $NavUrl . $this->PageNum . "\">尾页</a>\n";
	$PageHtml .= "</div>\n";
	return  $PageHtml; 
   }
   
   private function NumPage( $Can = '' ) { //数字分页
	   $NumHtml = '';
	   $First   = 1;
	   $Last    = $this->PageNum;
	   if ( $this->PageNum > 5 ) {
		   if ( $this->PageNo < $this->PageNum ) {
			  $First = $this->PageNo - 2;
			  $Last  = $this->PageNo + 2;
		   }else{
			  $First = $this->PageNo - 4;
			  $Last  = $this->PageNum;
		   }
	   }
	   if ( $First < 1 ) { $First   = 1; $Last = $First + 4;}
	   if ( $Last  > $this->PageNum ) { $First   = $this->PageNum - 4; $Last = $this->PageNum;}
	   for( $i = $First; $i <= $Last; $i++) {
		   $NumHtml .= $this->PageNo != $i ? "\n\t" . '<a href="' . $Can . $i . '">' . $i . '</a>' . "\n\t" : "\n\t" .'<a class="hover" disabled="disabled">' . $i . '</a>' . "\n\t";
	   }
	   unset($Can, $First, $i, $Last);
	   return $NumHtml;
   }
   
   public function UserPage($NumNav = false, $PageName = 'index', $Mulu = 'user' ) {  //会员中心分页
     $NavUrl   = '/' . $Mulu . '/' . $PageName . '/' . $this->PageKey . '/';
	 $PageHtml = "\n<div class=\"pagenav\">";
	 $PageHtml .= '<span>' . $this->PageCount . '条记录        ' . $this->PageNo . '/' . $this->PageNum . '页</span>            ';
	 $this->PageNo <= 1 or $PageHtml .= "<a href=\"" . $NavUrl . "1\">首页</a>\n<a href=\"" .  $NavUrl . ($this->PageNo - 1) . "\">上一页</a>\n";
	if ( $NumNav ) { $PageHtml .= $this->NumPage($NavUrl); }
	$this->PageNo >= $this->PageNum or $PageHtml .= "<a href=\"" . $NavUrl. ($this->PageNo + 1) .  "\">下一页</a>\n<a href=\"" . $NavUrl . $this->PageNum . "\">尾页</a>\n";
	$PageHtml .= "</div><div class=\"clear\"></div>\n";
	return  $PageHtml; 
   }
   
   
   //表单处理开始
   
	//判断表单时候提交
	public function FormIs( $Keys = 'mm' ) {
		return $_POST[ $Keys ] == 1 ? true : false;
	}
	
	//post方式获取数据
	public function _post( $Keys = '', $TiHuan = '') {
		$Values = strip_tags( $_POST[ $Keys ] );
		$this->FormArray[$Keys] = empty( $Values ) ? $TiHuan : $Values;
        return  empty( $Values ) ? $TiHuan : $Values;
	}
	
	//get方法获取数据
	public function _get( $Keys = '', $TiHuan = '') {
		$Values = strip_tags( $_GET[ $Keys ] );
        return  empty( $Values ) ? $TiHuan : $Values;
	}
	
	//判断是否为数字并且不小于0
	public function IsNum( $Num = 0, $Mesg = '参数必须为数字' ) {
		if ( is_numeric( $Num ) && !empty( $Num ) && $Num >= 0 ) {
			return $Num;
		}else{
			die( $Mesg );
		}
	}
	
	//判断是否为数字并且不小于0返回True/False
	public function NumBer( $Num = 0) {
		 return  is_numeric( $Num ) && !empty( $Num ) && $Num >= 0 ? true : false;
	}
	
	//检测相关数据似乎存在
	public function IsData($Types = true, $memg = '数据已经存在' ){
		$this->Connection('select ' . $this->Field . ' from ' . $this->Table . $this->Where);
		if ( $Types ){
			$this->Rest->num_rows > 0 ? die( $memg ) : null;
		} else {
			return $this->Rest->num_rows;
		}
	}
	
	
	//写入数据库记录
	public function into( $Mesg = '' ){
		!is_array( $this->FormArray ) ? die( $Mesg ) : null;
		$Sql = 'insert into ' . $this->Table . ' (`';
		$I   = 0;
		foreach ( $this->FormArray as $Key => $Val ){
			$Duan .= !$I ? $Key . '`' : ', `' . $Key . '`';
			if ( is_numeric( $Val ) ){
				$Vals .= !$I ? $Val : ', ' . $Val;
			}else{
				$Vals .= !$I ? '\'' . $Val . '\'' : ', \'' . $Val . '\'';
			}
			$I++;
		}
		$Sql .= $Duan . ') values (' . $Vals . ')';
		
		//@file_put_contents('1.sql', $Sql, FILE_APPEND);
		
		$this->Connection( $Sql );
		return !empty( $this->Err ) ? false : true;
	}
	
   //数组形式写入数据
   public function MsgBox( $Table = '', $Filed = array() ) {
	   $this -> Table($Table);
	   foreach( $Filed as $Key => $Val ) {
		  $this -> FormArray[ $Key ] = $Val; 
	   }
	  return $this ->  Into('未取得数据');
   }
   
   //修改数据库记录
   public function Edit( $Array = array() ) {
	   if ( empty( $Array ) ) { $Array = $this -> FormArray; }
	   if ( !is_array( $Array ) || empty( $Array ) ) {
		   return false;
	   } else {
	      $Sql = 'update ' . $this -> Table . ' set ';
		  $I   = 0;
		  $Sub = '';
		  $Huan = array('-' => '[jian]', '+' => '[jia]', '*' => '[cheng]', '/' => '[chu]');
		  $Zhan = array('[jian]' => '-', '[jia]' => '+', '[cheng]' => '*', '[chu]' => '/');

		  foreach ( $Array as $Files => $Val ) {
			  $Val  = !is_numeric( $Val ) && !preg_match('/\`\w+\`\s*(\+|\-|\*|\/)/i', $Val) ? '\'' . $Val . '\'' : $Val;
			  foreach ( $Huan as $key => $val ){
				  $Val = str_replace($key, $val, $Val);
			  }
			  $duan = !$I ? '`' . $Files . '` = ' :  ', `' . $Files . '` = ';
			  $Sub .= $duan . $Val;
			  $I++;
		  }
		  $Sql .= $Sub . $this -> Where;
		  foreach ( $Zhan as $Fan => $Hui ) {
			  $Sql = str_replace($Fan, $Hui, $Sql);
		  }
		  
		  //echo $Sql; die;
		  
	   $this -> Connection( $Sql );
	   unset( $Array, $duan, $Fan, $Files, $Huan, $Hui, $I, $key, $Sql, $Sub, $Val, $Zhan, $val );
	   return !empty( $this -> Err ) ? false : true;
	  }
   }
	
   //删除数据库记录
   public function del(){
	   $Sql = 'delete from ' . $this->Table . $this->Where;
	   $this->Connection( $Sql );
	   unset($Sql);
	   return !empty( $this->Err ) ? false : true;
   }
   
   //表单处理结束
   
   //页面跳转
   public function Msg( $Text = '操作成功' ) {
	   echo '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
	   echo '<script type="text/javascript">
  <!--
    alert("' . $Text . '");
	document.location="' . $_SERVER['HTTP_REFERER'] . '";
  //-->   
</script>';
 exit;
   }
   
   #取得系统当前时间
   public function Times(){
	   return str_replace('-', '[jian]', date('Y-m-d H:i:s'));
   }
   
   #取得用户IP地址
	public function GetIP(){ 
	  if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) 
	   $ip = getenv("HTTP_CLIENT_IP"); 
		else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) 
	   $ip = getenv("HTTP_X_FORWARDED_FOR"); 
		else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) 
	   $ip = getenv("REMOTE_ADDR"); 
		else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) 
	   $ip = $_SERVER['REMOTE_ADDR']; 
		else 
	   $ip = "unknown"; 
	  return($ip); 
	} 
   
   
   //最后关闭数据库连接
   public function Close(){
	   !is_object( $this -> Conn ) or mysqli_close( $this -> Conn );
   }
	
}