一个简单的php mysql数据库操作类，含有增删改查以及分页和排序功能 直接实例化 $db_class 即可使用 ！

<?php     class Mysql{          private $LocalHost = 'localhost';          private $LoaclUser = '';          private $LocalPass = '';          private $LocalBase = '';          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 . '" rel="external nofollow" >' . $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 );                      }}

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