host =  'localhost';    $this->port =  '3306';    $this->user =  'root';    $this->pass =  'root';    $this->db =  'girls';    $this->charset= 'utf8';    //连接数据库    $this->db_connect();    //选择数据库    $this->db_usedb();    //设置字符集    $this->db_charset();   }   //连接数据库   private function db_connect(){    $this->link=mysqli_connect($this->host.':'.$this->port,$this->user,$this->pass);    if(!$this->link){      echo "数据库连接失败
";      echo "错误编码".mysqli_errno($this->link)."
";      echo "错误信息".mysqli_error($this->link)."
";      exit;    }   }   //设置字符集    private function db_charset(){     mysqli_query($this->link,"set names {
   $this->charset}");    }    //选择数据库   private function db_usedb(){     mysqli_query($this->link,"use {
   $this->db}");   }   //私有的克隆   private function __clone(){     die('clone is not allowed');   }   //公用的静态方法   public static function getIntance(){     if(self::$dbcon==false){      self::$dbcon=new self;     }     return self::$dbcon;   }   //执行sql语句的方法    public function query($sql){     $res=mysqli_query($this->link,$sql);     if(!$res){      echo "sql语句执行失败
";      echo "错误编码是".mysqli_errno($this->link)."
";      echo "错误信息是".mysqli_error($this->link)."
";     }     return $res;   }    //获得最后一条记录id    public function getInsertid(){     return mysqli_insert_id($this->link);    }   /**    * 查询某个字段    * @param    * @return string or int    */    public function getOne($sql){     $query=$this->query($sql);      return mysqli_free_result($query);    }    //获取一行记录,return array 一维数组    public function getRow($sql,$type="assoc"){     $query=$this->query($sql);     if(!in_array($type,array("assoc",'array',"row"))){       die("mysqli_query error");     }     $funcname="mysqli_fetch_".$type;     return $funcname($query);    }    //获取一条记录,前置条件通过资源获取一条记录    public function getFormSource($query,$type="assoc"){    if(!in_array($type,array("assoc","array","row")))    {      die("mysqli_query error");    }    $funcname="mysqli_fetch_".$type;    return $funcname($query);    }    //获取多条数据，二维数组    public function getAll($sql){     $query=$this->query($sql);     $list=array();     while ($r=$this->getFormSource($query)) {      $list[]=$r;     }     return $list;    }    public function selectAll($table,$where,$fields='*',$order='',$skip=0,$limit=1000)    {              if(is_array($where)){                    foreach ($where as $key => $val) {                        if (is_numeric($val)) {                            $condition = $key.'='.$val;                        }else{                            $condition = $key.'=\"'.$val.'\"';                        }                    }              } else {                $condition = $where;              }              if (!empty($order)) {                  $order = " order by ".$order;              }              $sql = "select $fields from $table where $condition $order limit $skip,$limit";              $query = $this->query($sql);              $list = array();              while ($r= $this->getFormSource($query)) {                  $list[] = $r;              }              return $list;    }     /**     * 定义添加数据的方法     * @param string $table 表名     * @param string orarray $data [数据]     * @return int 最新添加的id     */     public function insert($table,$data){     //遍历数组，得到每一个字段和字段的值     $key_str='';     $v_str='';     foreach($data as $key=>$v){     //  if(empty($v)){     //   die("error");     // }        //$key的值是每一个字段s一个字段所对应的值        $key_str.=$key.',';        $v_str.="'$v',";     }     $key_str=trim($key_str,',');     $v_str=trim($v_str,',');     //判断数据是否为空     $sql="insert into $table ($key_str) values ($v_str)";     $this->query($sql);    //返回上一次增加操做产生ID值     return $this->getInsertid();   }   /*    * 删除一条数据方法    * @param1 $table, $where=array('id'=>'1') 表名 条件    * @return 受影响的行数    */    public function deleteOne($table, $where){      if(is_array($where)){        foreach ($where as $key => $val) {          $condition = $key.'='.$val;        }      } else {        $condition = $where;      }      $sql = "delete from $table where $condition";      $this->query($sql);      //返回受影响的行数      return mysqli_affected_rows($this->link);    }    /*    * 删除多条数据方法    * @param1 $table, $where 表名 条件    * @return 受影响的行数    */    public function deleteAll($table, $where){      if(is_array($where)){        foreach ($where as $key => $val) {          if(is_array($val)){            $condition = $key.' in ('.implode(',', $val) .')';          } else {            $condition = $key. '=' .$val;          }        }      } else {        $condition = $where;      }      $sql = "delete from $table where $condition";      $this->query($sql);      //返回受影响的行数      return mysqli_affected_rows($this->link);    }   /**    * [修改操作description]    * @param [type] $table [表名]    * @param [type] $data [数据]    * @param [type] $where [条件]    * @return [type]    */   public function update($table,$data,$where,$limit=0){     //遍历数组，得到每一个字段和字段的值     $str='';    foreach($data as $key=>$v){     $str.="$key='$v',";    }    $str=rtrim($str,',');      if(is_array($where)){        foreach ($where as $key => $val) {          if(is_array($val)){            $condition = $key.' in ('.implode(',', $val) .')';          } else {            $condition = $key. '=' .$val;          }        }      } else {        $condition = $where;      }        if (!empty($limit)) {            $limit = " limit ".$limit;        }else{            $limit='';        }    //修改SQL语句    $sql="update $table set $str where $condition $limit";    $this->query($sql);    //返回受影响的行数    return mysqli_affected_rows($this->link);   }}?>