通过以下查询,我获取不同类的值
$query = xtc_db_query("-- " . __LINE__ . __FILE__ . "
SELECT value
FROM " . TABLE_ORDERS_TOTAL . "
WHERE orders_id = " . $last_order . "
AND class = 'ot_shipping'
");
$orders_total_shipping = xtc_db_fetch_array($query);
$query = xtc_db_query("-- " . __LINE__ . __FILE__ . "
SELECT value
FROM " . TABLE_ORDERS_TOTAL . "
WHERE orders_id = " . $last_order . "
AND class='ot_tax'
");
$orders_total_tax = xtc_db_fetch_array($query);
$query = xtc_db_query("-- " . __LINE__ . __FILE__ . "
SELECT value
FROM " . TABLE_ORDERS_TOTAL . "
WHERE orders_id = " . $last_order . "
AND class='ot_total'
");
$orders_total = xtc_db_fetch_array($query);
是否可以通过一次查询获取值?
最佳答案
可能是这样的
$query = xtc_db_query("-- " . __LINE__ . __FILE__ . "
SELECT Case When class = 'ot_shipping' The value Else Null End As Shipping,
Case When class = 'ot_tax' The value Else Null End As Tax,
Case When class = 'ot_total' The value Else Null End As Total
FROM " . TABLE_ORDERS_TOTAL . "
WHERE orders_id = " . $last_order . "
");
$orders_total_shipping = xtc_db_fetch_array($query);
或者:
$query = xtc_db_query("-- " . __LINE__ . __FILE__ . "
SELECT value
FROM " . TABLE_ORDERS_TOTAL . "
WHERE orders_id = " . $last_order . "
AND class = 'ot_shipping'
Union All
SELECT value
FROM " . TABLE_ORDERS_TOTAL . "
WHERE orders_id = " . $last_order . "
AND class='ot_tax'
UNION ALL
SELECT value
FROM " . TABLE_ORDERS_TOTAL . "
WHERE orders_id = " . $last_order . "
AND class='ot_total'
");
$orders_total = xtc_db_fetch_array($query);
关于mysql - 通过一个 mysql-query 获取值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25421589/