我有一个查询从db读取杂志
$select = $db->select()
->from('tbl_magazine',array('magazine_id','magazine_name'))
->join('tbl_magazine_issue','tbl_magazine_issue.magazine_id = tbl_magazine.magazine_id',array(null))
->join('mst_publisher','mst_publisher.publisher_id = tbl_magazine.publisher_id',array(null))
->where('tbl_magazine.is_active =?',1)
->where('mst_publisher.is_active =?',1)
->where('tbl_magazine_issue.os_select =?',2)
->where('tbl_magazine_issue.publish_status = ?',1)
->where('curdate() <= DATE(tbl_magazine.validity_till)')
->group('tbl_magazine.magazine_id')
->limit($start,$per_page);
但是当我打印查询时,我看到一些像这样的东西
SELECT `tbl_magazine`.`magazine_id`, `tbl_magazine`.`magazine_name`
FROM `tbl_magazine`
INNER JOIN `tbl_magazine_issue` ON tbl_magazine_issue.magazine_id = tbl_magazine.magazine_id
INNER JOIN `mst_publisher` ON mst_publisher.publisher_id = tbl_magazine.publisher_id
WHERE (tbl_magazine.is_active =1) AND (mst_publisher.is_active =1)
AND (tbl_magazine_issue.os_select =2) AND (tbl_magazine_issue.publish_status = 1)
AND (curdate() <= DATE(tbl_magazine.validity_till))
GROUP BY `tbl_magazine`.`magazine_id`
LIMIT 2147483647 OFFSET 8
但是我将$ start设置为0,将$ perpage设置为8
我正在寻找限制为"limit 0 ,8"
答案 0 :(得分:5)
您没有正确使用limit
。
以下是Zend_Db_Select
的功能定义。如您所见,第一个参数是count
而不是offset
。
/**
* Sets a limit count and offset to the query.
*
* @param int $count OPTIONAL The number of rows to return.
* @param int $offset OPTIONAL Start returning after this many rows.
* @return Zend_Db_Select This Zend_Db_Select object.
*/
public function limit($count = null, $offset = null)
{
$this->_parts[self::LIMIT_COUNT] = (int) $count;
$this->_parts[self::LIMIT_OFFSET] = (int) $offset;
return $this;
}
<小时/> 并且只是解释为什么你得到那些疯狂的值...下面是呈现SQL查询的脚本的一部分。因为您有偏移量,所以将计数设置为PHP_INT_MAX。
if (!empty($this->_parts[self::LIMIT_OFFSET])) {
$offset = (int) $this->_parts[self::LIMIT_OFFSET];
$count = PHP_INT_MAX;
}