2016-04-14 98 views
-1

我在互联网上发现这个和迄今为止好一个条件!但我怎么能在sql语句中添加2个或更多的条件?如何添加另一个条件pdo sql语句

public static function getInstance() { 
    if(!isset(self::$_instance)) { 
     self::$_instance = new DB(); 
    } 
    return self::$_instance; 
} 

public function query($sql, $params = array()) { 
    $this->_error = false; 

    if($this->_query = $this->_pdo->prepare($sql)) { 
     $x = 1; 
     if(count($params)) { 
      foreach($params as $param) { 
       $this->_query->bindValue($x, $param); 
       $x++; 
      } 
     } 

     if($this->_query->execute()) { 
      $this->_results = $this->_query->fetchAll(PDO::FETCH_OBJ); 
      $this->_count = $this->_query->rowCount(); 
     } else { 
      $this->_error = true; 
     } 
    } 

    return $this; 
} 

public function action($action, $table, $where = array()) { 
    if(count($where) === 3) { 
     $operators = array('=', '>', '<', '>=', '<='); 

     $field = $where[0]; 
     $operator = $where[1]; 
     $value = $where[2]; 

     if(in_array($operator, $operators)) { 
      $sql = "{$action} FROM {$table} WHERE {$field} {$operator} ?"; 

      if(!$this->query($sql, array($value))->error()) { 
       return $this; 
      } 
     } 

    } 

    return false; 
} 

public function get($table, $where) { 
    return $this->action('SELECT *', $table, $where); 
} 

我想创造这样的另一个功能:

public function get($table, $where1, $where2) { 
    return $this->action('SELECT *', $table, $where, $where2); 
} 

条件$where$where2等...我怎么能做到这一点?即时通讯知道我应该创建新的方法action2和query2来实现这些变化,但正如我所说即时尝试5天现在,我试了一切。 PLZ帮助我,并提前感谢!

+0

我只想把它与1'$ where'参数,但要一个多维数组。例如:[['field','operator','value'],['field','operator','value']]''。你必须改变方法。 – Daan

+0

我不介意改变方法,我试图$ where = array(array(),array())和$ field = $其中[0] [0]等...但它没有工作 –

+0

你看到95%的我的项目是这些方法!但我需要过滤一些结果与3我假设的条件。 –

回答

-1

我找到了解决方案,但我不得不减少安全.. 我只改变了这一点!

public function action3($action, $table, $where = array()) { 
    /*if(count($where) === 6) {*/ 
     $operators = array('=', '>', '<', '>=', '<='); 
     $field1 = $where[0]; 
     $operator1 = $where[1]; 
     $value1 = $where[2]; 
     $field2 = $where[3]; 
     $operator2 = $where[4]; 
     $value2 = $where[5]; 

/*if(in_array($operator, $operators)) {*/ $sql = "{$action} FROM {$table} WHERE {$field1} {$operator1} {$value1} AND {$field2} {$operator2} {$value2}"; if(!$this->query($sql, array($value1, $value2))->error()) {

   return $this; 
      } 
    /* }*/ 

    /* }*/ 

    return false; 
} 

public function get3($table, $where) { 
    return $this->action3('SELECT *', $table, $where); 
}