Question

我想将整数数组作为参数传递给存储过程，怎么做呢？

CREATE PROCEDURE rd22(unitList INT)
 BEGIN
    SELECT * FROM abet INNER JOIN a ON a.id = abet.alarm_source 
    AND a.unit IN (unitList) 
    WHERE abet.begin_timestamp = 1395874800000;
END

这就是存储过程的样子，我希望得到这样的东西：

SET @val = [1,2,3];
CALL rd22(@val);

我能想到的一种方法是传递一个字符串，然后以某种方式将其转换为整数。有没有其他微妙的方法来实现这个目标。

感谢您的时间。

干杯。

Answer 1

你不能这样做，当你在查询中以逗号分隔的字符串传递param时它只会在执行in clause时获取第一个值，你需要使用带有预准备语句的动态查询

CREATE PROCEDURE rd22(unitList varchar(100))
 BEGIN
    set @ul = unitList;
    set @qry = concat("select * from abet INNER JOIN a ON a.id = abet.alarm_source and a.unit IN(",@ul,") WHERE abet.begin_timestamp = 1395874800000");    
    prepare stmt from @qry;
    execute stmt;    
END

电话会议

SET @val = '1,2,3';
CALL rd22(@val);

以下是mysql中的测试用例

mysql> select * from test ;
+------+---------------------+---------------------+----------+
| id   | created             | resolved            | status   |
+------+---------------------+---------------------+----------+
|    1 | 2015-05-10 00:00:00 | 1970-01-01 00:00:00 | open     |
|    2 | 2015-05-10 00:00:00 | 1970-01-01 00:00:00 | new      |
|    3 | 2015-05-10 00:00:00 | 2015-05-12 00:00:00 | resolved |
|    4 | 2015-05-11 00:00:00 | 1970-01-01 00:00:00 | open     |
|    5 | 2015-05-11 00:00:00 | 1970-01-01 00:00:00 | new      |
|    6 | 2015-05-11 00:00:00 | 2015-05-11 00:00:00 | resolved |
|    7 | 2015-05-12 00:00:00 | 1970-01-01 00:00:00 | open     |
|    8 | 2015-05-12 00:00:00 | 1970-01-01 00:00:00 | new      |
|    9 | 2015-05-12 00:00:00 | 1970-01-01 00:00:00 | open     |
+------+---------------------+---------------------+----------+
9 rows in set (0.00 sec)


mysql> delimiter //
mysql> CREATE PROCEDURE testin(vals varchar(100))
    ->  BEGIN
    ->     set @ul = vals;
    ->     set @qry = concat("select * from test where id IN(",@ul,")");    
    ->     prepare stmt from @qry;
    ->     execute stmt;    
    -> END;//
Query OK, 0 rows affected (0.03 sec)

mysql> set @val = '3,4,6';
Query OK, 0 rows affected (0.00 sec)

mysql> call testin(@val);
+------+---------------------+---------------------+----------+
| id   | created             | resolved            | status   |
+------+---------------------+---------------------+----------+
|    3 | 2015-05-10 00:00:00 | 2015-05-12 00:00:00 | resolved |
|    4 | 2015-05-11 00:00:00 | 1970-01-01 00:00:00 | open     |
|    6 | 2015-05-11 00:00:00 | 2015-05-11 00:00:00 | resolved |
+------+---------------------+---------------------+----------+
3 rows in set (0.01 sec)

使用整数数组作为参数调用存储过程？

1 个答案: