codeigniter 活动记录获取查询和不带 LIMIT 子句的查询 [英] codeigniter active record get query and query without the LIMIT clause

问题描述

我正在使用活动记录，一切正常，但我想将 $data["totalres"] 设置为总结果，我的意思是，相同的查询但没有 LIMIT

im using active record, its all working ok but i want to set the $data["totalres"] to the total results, i mean, the same query but without the LIMIT

问题是当您执行查询修饰符时，前面的语句未设置，所以我什至无法在获得结果后添加 $this->db->limit().

the problem is the previous statements gets unset when you do a query modifier, so i cant even add the $this->db->limit() after i get the results.

有什么想法吗?我认为为了做到这一点而复制"查询是一种不好的做法

any ideas? i think its a bad practice to 'duplicate' the query just to do this

function get_search($start, $numrows, $filter = array())
{    

    ...

    $this->db
    ->select("emp")
    ->from('emp')
    ->join('empr', 'empr.b = empr.id', 'left')
    ->like('code', $code)
    ->limit($numrows, $start);

    ...

    $q = $this->db->get();        

    // number of rows WITHOUT the LIMIT X,Y filter
    $data["totalres"] = ???????;        

    if ($q->num_rows() > 0)
    {        
        $data["results"] = $q->result();
    } else {
        $data["results"] = array();
    }   

    return $data;
}    

推荐答案

您可以使用 SQL_CALC_FOUND_ROWS 以获取将返回的行数 sans-LIMIT.注意 select 行中的 ,FALSE.这告诉 CodeIgniter 不要试图用反引号转义 SELECT 子句(因为 SQL_CALC_FOUND_ROWS 不是一个字段，而 CodeIgniter 没有意识到这一点).

You can use SQL_CALC_FOUND_ROWS to get the number of rows that would have been returned sans-LIMIT. Note the ,FALSE in the select line. This tells CodeIgniter not to try to escape the SELECT clause with backticks (because SQL_CALC_FOUND_ROWS is not a field, and CodeIgniter doesn't realize that).

$this->db
->select("SQL_CALC_FOUND_ROWS emp", FALSE)
->from('emp')
->join('empr', 'empr.b = empr.id', 'left')
->like('code', $code)
->limit($numrows, $start);

$q = $this->db->get();

然后在运行该查询之后，我们需要运行另一个查询来获取总行数.

Then after that query is ran, we need run another query to get the total number of rows.

$query = $this->db->query('SELECT FOUND_ROWS() AS `Count`');
$data["totalres"] = $query->row()->Count;

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