封装类似thinkphp连贯操作数据库的Db类(简单版)。

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<?php header("Content-Type:text/html;charset=utf-8");   /**  *php操作mysql的工具类  */ class Db{     private $_db = null;//数据库连接句柄     private $_table = null;//表名     private $_where = null;//where条件     private $_order = null;//order排序     private $_limit = null;//limit限定查询     private $_group = null;//group分组     private $_configs = array(                 'hostname' => 'localhost',                 'dbname'   => 'test',                 'username' => 'root',                 'password' => '1234'             );//数据库配置       /**      * 构造函数，连接数据库      */     public function __construct(){         $link = $this->_db;         if(!$link){             $db = mysqli_connect($this->_configs['hostname'],$this->_configs['username'],$this->_configs['password'],$this->_configs['dbname']);             mysqli_query($db,"set names utf8");             if(!$db){                 $this->ShowException("错误信息".mysqli_connect_error());             }             $this->_db = $db;         }     }       /**      * 获取所有数据      *      * @param      <type>   $table  The table      *      * @return     boolean  All.      */     public function getAll($table=null){         $link = $this->_db;         if(!$link)return false;         $sql = "SELECT * FROM {$table}";         $data = mysqli_fetch_all($this->execute($sql));         return $data;     }       public function table($table){         $this->_table = $table;         return $this;     }       /**      * 实现查询操作      *      * @param      string   $fields  The fields      *      * @return     boolean  ( description_of_the_return_value )      */     public function select($fields="*"){         $fieldsStr = '';         $link = $this->_db;         if(!$link)return false;         if(is_array($fields)){             $fieldsStr = implode(',', $fields);         }elseif(is_string($fields)&&!empty($fields)){             $fieldsStr = $fields;         }         $sql = "SELECT {$fields} FROM {$this->_table} {$this->_where} {$this->_order} {$this->_limit}";         $data = mysqli_fetch_all($this->execute($sql));         return $data;     }       /**      * order排序      *      * @param      string   $order  The order      *      * @return     boolean  ( description_of_the_return_value )      */     public function order($order=''){         $orderStr = '';         $link = $this->_db;         if(!$link)return false;         if(is_string($order)&&!empty($order)){             $orderStr = "ORDER BY ".$order;         }         $this->_order = $orderStr;         return $this;     }       /**      * where条件      *      * @param      string  $where  The where      *      * @return     <type>  ( description_of_the_return_value )      */     public function where($where=''){         $whereStr = '';         $link = $this->_db;         if(!$link)return $link;         if(is_array($where)){             foreach ($where as $key => $value) {                 if($value == end($where)){                     $whereStr .= "`".$key."` = '".$value."'";                 }else{                     $whereStr .= "`".$key."` = '".$value."' AND ";                 }             }             $whereStr = "WHERE ".$whereStr;         }elseif(is_string($where)&&!empty($where)){             $whereStr = "WHERE ".$where;         }         $this->_where = $whereStr;         return $this;     }       /**      * group分组      *      * @param      string   $group  The group      *      * @return     boolean  ( description_of_the_return_value )      */     public function group($group=''){         $groupStr = '';         $link = $this->_db;         if(!$link)return false;         if(is_array($group)){             $groupStr = "GROUP BY ".implode(',',$group);         }elseif(is_string($group)&&!empty($group)){             $groupStr = "GROUP BY ".$group;         }         $this->_group = $groupStr;         return $this;     }       /**      * limit限定查询      *      * @param      string  $limit  The limit      *      * @return     <type>  ( description_of_the_return_value )      */     public function limit($limit=''){         $limitStr = '';         $link = $this->_db;         if(!$link)return $link;         if(is_string($limit)||!empty($limit)){             $limitStr = "LIMIT ".$limit;         }elseif(is_numeric($limit)){             $limitStr = "LIMIT ".$limit;         }         $this->_limit = $limitStr;         return $this;     }       /**      * 执行sql语句      *      * @param      <type>   $sql    The sql      *      * @return     boolean  ( description_of_the_return_value )      */     public function execute($sql=null){         $link = $this->_db;         if(!$link)return false;         $res = mysqli_query($this->_db,$sql);         if(!$res){             $errors = mysqli_error_list($this->_db);             $this->ShowException("报错啦！<br/>错误号：".$errors[0]['errno']."<br/>SQL错误状态：".$errors[0]['sqlstate']."<br/>错误信息：".$errors[0]['error']);             die();         }         return $res;     }       /**      * 插入数据      *      * @param      <type>   $data   The data      *      * @return     boolean  ( description_of_the_return_value )      */     public function insert($data){         $link = $this->_db;         if(!$link)return false;         if(is_array($data)){             $keys = '';             $values = '';             foreach ($data as $key => $value) {                 $keys .= "`".$key."`,";                 $values .= "'".$value."',";             }             $keys = rtrim($keys,',');             $values = rtrim($values,',');         }         $sql = "INSERT INTO `{$this->_table}`({$keys}) VALUES({$values})";         mysqli_query($this->_db,$sql);         $insertId = mysqli_insert_id($this->_db);         return $insertId;     }       /**      * 更新数据      *      * @param      <type>  $data   The data      *      * @return     <type>  ( description_of_the_return_value )      */     public function update($data){         $link = $this->_db;         if(!$link)return $link;         if(is_array($data)){             $dataStr = '';             foreach ($data as $key => $value) {                 $dataStr .= "`".$key."`='".$value."',";             }             $dataStr = rtrim($dataStr,',');         }         $sql = "UPDATE `{$this->_table}` SET {$dataStr} {$this->_where} {$this->_order} {$this->_limit}";         $res = $this->execute($sql);         return $res;     }       /**      * 删除数据      *      * @return     <type>  ( description_of_the_return_value )      */     public function delete(){         $link = $this->_db;         if(!$link)return $link;         $sql = "DELETE FROM `{$this->_table}` {$this->_where}";         $res = $this->execute($sql);         return $res;     }       /**      * 异常信息输出      *      * @param      <type>  $var    The variable      */     private function ShowException($var){         if(is_bool($var)){             var_dump($var);         }else if(is_null($var)){             var_dump(NULL);         }else{             echo "<pre style='position:relative;z-index:1000;padding:10px;border-radius:5px;background:#F5F5F5;border:1px solid #aaa;font-size:14px;line-height:18px;opacity:0.9;'>".print_r($var,true)."</pre>";         }     }   } $db = new Db(); //查询操作 var_dump($db->table('user')->where('id > 2')->order('id desc')->limit('2,4')->select());   //插入操作 var_dump($db->table('user')->insert(array('username'=>'user','password'=>'pwd')));   //更新操作 var_dump($db->table('user')->where('id = 1')->update(array('username'=>'user1','password'=>'pwd1')));   //删除操作 var_dump($db->table('user')->where('id = 1')->delete());