Question

我的模型中有以下函数从数据库中获取一些数据，我使用的是codeigniter的默认分页类，为此我在下面的代码中有$ perPage和$ uri。

function payment_due($month,$year,$fee_type,$perPage,$uri ) { 

$getData = $this->db->query("SELECT DISTINCT studentid,studentname FROM
 student  WHERE NOT EXISTS
 (SELECT * FROM studentpayment1 JOIN studentpayment2 
                      ON studentpayment1.paymentid=studentpayment2.pid
WHERE fee_month='$month' AND fee_type='$fee_type' 
 AND fee_year='$year' AND student.studentid=studentpayment1.studentid )
 " );


        if($getData->num_rows() > 0)
        return $getData->result_array();
        else
        return null;
        }

通常当我从表中获取数据时，我使用$ perPage和$ uri，就像这样 - ＆gt;

$getData = $this->db->get('', $perPage, $uri);

现在我的问题是，请你告诉我在上面的函数中我应该在哪里使用$ perPage和$ uri？

提前致谢：）

如果我在db查询结束时使用$ perPage，$ uri，我会收到以下错误：

  A Database Error Occurred
 Error Number: 1064

You have an error in your SQL syntax; check the manual 
that corresponds to your MySQL  server version for the right syntax to
use near '15' at line 3

 SELECT DISTINCT studentid,studentname FROM student WHERE NOT EXISTS
   (SELECT * FROM   studentpayment1 JOIN studentpayment2
  ON  studentpayment1.paymentid=studentpayment2.pid WHERE 
 fee_month='February' AND fee_type='Monthly Fee' AND fee_year='2012'
  AND student.studentid=studentpayment1.studentid ) LIMIT ,15

  Filename: C:\xampp\htdocs\utc\system\database\DB_driver.php

行号：330 `

Answer 1

在user_guide中，您可以看到$this->db->get()的代码示例以及生成的内容：

第二个和第三个参数使您可以设置限制和偏移子句：

$query = $this->db->get('mytable', 10, 20);

// Produces: SELECT * FROM mytable LIMIT 20, 10 (in MySQL. Other databases have slightly different syntax)

所以基本上你需要在你的查询中设置LIMIT，在它的末尾添加类似的东西：

LIMIT $uri,$perPage

Codeigniter在db查询中的$ uri和$ perPage

1 个答案: