如何使用连接查询添加偏移量和限制？答案

【问题标题】：how to add an offset and limit with join query?如何使用连接查询添加偏移量和限制？
【发布时间】：2016-02-24 06:23:44
【问题描述】：

我是codeigniter的新手，我已经完成了下面的代码

public function members($limit, $offset)
{
$this->load->model('Management/Member_model', 'member');
    $this->db->reset_query();
    $this->db->select('*');
    $this->db->from($this->member->table);
    $this->db->join('ib_communities_dtl','ib_communities_dtl.dtl_user_id='.$this->member->table.'.user_id','inner');
    $this->db->join('ib_communities','ib_communities_dtl.dtl_community_id=ib_communities.community_id','inner');
    $this->db->where('ib_communities.community_id', $this->community_id);

  return $this->db->get()->result('Member_model');
}

我想在上面的查询中添加偏移量和限制，谁能帮我修改它来完成？

提前致谢

【问题讨论】：

阅读手册codeigniter.com/userguide3/database/…

标签： php mysql codeigniter

【解决方案1】：

public function members($limit, $offset)
{
$this->load->model('Management/Member_model', 'member');
    $this->db->reset_query();
    $this->db->select('*');
    $this->db->from($this->member->table);
    $this->db->join('ib_communities_dtl','ib_communities_dtl.dtl_user_id='.$this->member->table.'.user_id','inner');
    $this->db->join('ib_communities','ib_communities_dtl.dtl_community_id=ib_communities.community_id','inner');
    $this->db->where('ib_communities.community_id', $this->community_id);
$this->db->limit($limit, $offset);

  return $this->db->get()->result('Member_model');
}

【讨论】：

【解决方案2】：

您可以在CI limit函数中添加偏移量和限制为：

$this->db->limit(LIMIT,OFFSET);

示例：

public function members($limit, $offset)
{
    $this->load->model('Management/Member_model', 'member');
    $this->db->reset_query();
    $this->db->select('*');
    $this->db->from($this->member->table);
    $this->db->join('ib_communities_dtl','ib_communities_dtl.dtl_user_id='.$this->member->table.'.user_id','inner');
    $this->db->join('ib_communities','ib_communities_dtl.dtl_community_id=ib_communities.community_id','inner');
    $this->db->where('ib_communities.community_id', $this->community_id);
    $this->db->limit($limit,$offset);  //CHANGED
    return $this->db->get()->result('Member_model');
}

【讨论】：

【解决方案3】：

我刚刚注意到查询构建器部分中的以下功能：

$this->db->limit(10, 20); // specifying the limit and the offset

【讨论】：