<?php// 數據庫連接類class DB{ //私有的屬性 private static $dbcon=false; private $host; private $port; private $user; private $pass; private $db; private $charset; private $link; //私有的構造方法 private function __construct(){  $this->host = 'localhost';  $this->port = '3306';  $this->user = 'root';  $this->pass = 'root';  $this->db = 'imooc';  $this->charset= 'utf8';  //連接數據庫  $this->db_connect();  //選擇數據庫  $this->db_usedb();  //設置字符集  $this->db_charset();  }  //連接數據庫  private function db_connect(){  $this->link=mysqli_connect($this->host.':'.$this->port,$this->user,$this->pass);  if(!$this->link){   echo "數據庫連接失敗<br>";   echo "錯誤編碼".mysqli_errno($this->link)."<br>";   echo "錯誤信息".mysqli_error($this->link)."<br>";   exit;  }  }  //設置字符集  private function db_charset(){   mysqli_query($this->link,"set names {$this->charset}");  }  //選擇數據庫  private function db_usedb(){   mysqli_query($this->link,"use {$this->db}");  }  //私有的克隆  private function __clone(){   die('clone is not allowed');  }  //公用的靜態方法  public static function getIntance(){   if(self::$dbcon==false){   self::$dbcon=new self;   }   return self::$dbcon;  }  //執行sql語句的方法  public function query($sql){   $res=mysqli_query($this->link,$sql);   if(!$res){   echo "sql語句執行失敗<br>";   echo "錯誤編碼是".mysqli_errno($this->link)."<br>";   echo "錯誤信息是".mysqli_error($this->link)."<br>";   }   return $res;  }  //獲得最后一條記錄id  public function getInsertid(){   return mysqli_insert_id($this->link);  }  /**  * 查詢某個字段  * @param  * @return string or int  */  public function getOne($sql){   $query=$this->query($sql);   return mysqli_free_result($query);  }  //獲取一行記錄,return array 一維數組  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);  }  //獲取一條記錄,前置條件通過資源獲取一條記錄  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);  }  //獲取多條數據，二維數組  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;  }   /**   * 定義添加數據的方法   * @param string $table 表名   * @param string orarray $data [數據]   * @return int 最新添加的id   */   public function insert($table,$data){   //遍歷數組，得到每一個字段和字段的值   $key_str='';   $v_str='';   foreach($data as $key=>$v){   // if(empty($v)){   //  die("error");   // }    //$key的值是每一個字段s一個字段所對應的值    $key_str.=$key.',';    $v_str.="'$v',";   }   $key_str=trim($key_str,',');   $v_str=trim($v_str,',');   //判斷數據是否為空   $sql="insert into $table ($key_str) values ($v_str)";   $this->query($sql);  //返回上一次增加操做產生ID值   return $this->getInsertid();  }  /*  * 刪除一條數據方法  * @param1 $table, $where=array('id'=>'1') 表名 條件  * @return 受影響的行數  */  public function deleteOne($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);   //返回受影響的行數   return mysqli_affected_rows($this->link);  }  /*  * 刪除多條數據方法  * @param1 $table, $where 表名 條件  * @return 受影響的行數  */  public function deleteAll($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);   //返回受影響的行數   return mysqli_affected_rows($this->link);  }  /**  * [修改操作description]  * @param [type] $table [表名]  * @param [type] $data [數據]  * @param [type] $where [條件]  * @return [type]  */  public function update($table,$data,$where,$limit=0){   //遍歷數組，得到每一個字段和字段的值   $str='';  foreach($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語句  $sql="update $table set $str where $condition $limit";  $this->query($sql);  //返回受影響的行數  return mysqli_affected_rows($this->link);  }}?>

$db = DB::getIntance();$insert_data = ['order_id'=>'10010','order_amount' = '200.00','status'=> 1];$res = $db->insert('order_info',$insert_data);