PHP返回所有行而不是请求的行

我有一个查询，它从表中返回所有行，而不是我指定的字段。你能看出这里面有什么错误吗？我用的是codeigniter

提前谢谢

unset($conditions);
    $conditions['conditions'] = array("accountid"=>$this->sessionInfo['database_account_id'],
                "DATE_FORMAT(salestart,'%Y-%m-%d')"=>$today,
                "shop"=>"london"
                );
    $conditions['group_by'] = "item";
    $conditions['fields'] = "accountid, item, count(uniqueid) as totalitems, sum(options) as totaloptions, colour";
    $today_sales = $this->Database_Model->selectData("sales",$conditions);

我的模型是：

public function selectData($table,$condition=array()) {
    if(isset($condition['fields'])){
        $fields = $condition['fields'];
    }
    else{
        $fields = "*";
    }
    $this->Database->select('*');
    $this->Database->from($table);
    if(isset($condition['conditions'])){
       $this->Database->where($condition['conditions']);
    }
    if(isset($condition['group_by'])){
        $this->Database->group_by($condition['group_by']);
    }
    if(isset($condition['order_by'])){
        $this->Database->order_by($condition['order_by']);
    }
    if(isset($condition['where_in'])){
        $where_in = $condition['where_in'];


        foreach($where_in as $key =>$value){
            $this->Database->where_in($key,$value);
         }
    }
    if(isset($condition['joins'])){
        $joins = $condition['joins'];
        foreach($joins as $join){
            $this->Database->join($join['table'], $join['joinWith'],$join['type']);
         }
    }
     $query = $this->Database->get();

     return $query->result_array();
}

改变这个

$this->Database->select('*');

对此

$this->Database->select($fields);

---

不知道-1是什么意思如果我遗漏了什么，请告诉我，谢谢！

$this

指的是什么？什么是

Database\u Model

？我已经包括了我的Database\u Model…使用

$this->Database->select（$fields，true）谢谢！现在工作。