这篇文章主要介绍PHP数据库操作类，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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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 ！

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
";
                       $PageHtml .= '' . $this->PageCount . '条记录    ' . $this->PageNo . '/' . $this->PageNum . '页      ';
                       $this->PageNo <= 1 or $PageHtml .= "首页\nPageNo - 1) . "\">上一页\n";
                      if ( $NumNav ) { $PageHtml .= $this->NumPage($NavUrl); }
                      $this->PageNo >= $this->PageNum or $PageHtml .= "PageNo + 1) . "\">下一页\nPageNum . "\">尾页\n";
                      $PageHtml .= "
\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" . '' . $i . '' . "\n\t" : "\n\t" .'' . $i . '' . "\n\t";
                        }
                        unset($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
";
                       $PageHtml .= '' . $this->PageCount . '条记录    ' . $this->PageNo . '/' . $this->PageNum . '页      ';
                       $this->PageNo <= 1 or $PageHtml .= "首页\nPageNo - 1) . "\">上一页\n";
                      if ( $NumNav ) { $PageHtml .= $this->NumPage($NavUrl); }
                      $this->PageNo >= $this->PageNum or $PageHtml .= "PageNo + 1) . "\">下一页\nPageNum . "\">尾页\n";
                      $PageHtml .= "
\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 '';
                        echo '';
                     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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