mariadb，如何在存储过程中查找数组中元素的索引

Question

我正在写一个存储过程，在过程中我有一个数组["sunday"、"monday"、"tuesday"、"wednesday"、"thursday"、 "friday"、"saturday"]

我有一个查询 return 是星期几，我想 return 从上面的数组中 returned 日期的索引。

我可以每天写一个 IF THEN ELSE 测试，但是有没有更优雅的方法使用内置函数来做同样的事情？

    IF vcSOW = 'sunday' THEN
        SET intSOW = 0;
    ELSEIF vcSOW = 'monday' THEN
        SET intSOW = 1;
    ELSEIF vcSOW = 'tuesday' THEN
        SET intSOW = 2;
    ELSEIF vcSOW = 'wednesday' THEN
        SET intSOW = 3;
    ELSEIF vcSOW = 'thursday' THEN
        SET intSOW = 4;
    ELSEIF vcSOW = 'friday' THEN
        SET intSOW = 5;
    ELSEIF vcSOW = 'saturday' THEN
        SET intSOW = 6;
    ELSE
        CALL procLogError(vcCompKey, CONCAT("Invalid start of week:", vcSOW));
        LEAVE exitProc;
    END IF;

因此，如果 returned 日期是 "sunday"，则索引 returned 将为 0，如果 "saturday" 则 returned 索引将为是 6.

Answer 1

提示：

mysql> SELECT FIND_IN_SET('monday', 'sunday,monday,tuesday,...');
+----------------------------------------------------+
| FIND_IN_SET('monday', 'sunday,monday,tuesday,...') |
+----------------------------------------------------+
|                                                  2 |
+----------------------------------------------------+
1 row in set (0.00 sec)

mysql> SELECT FIND_IN_SET('Junk', 'sunday,monday,tuesday,...');
+--------------------------------------------------+
| FIND_IN_SET('Junk', 'sunday,monday,tuesday,...') |
+--------------------------------------------------+
|                                                0 |
+--------------------------------------------------+
1 row in set (0.00 sec)

所以，类似于：

SELECT @dow := FIND_IN_SET(intSOW, 'sunday,monday,tuesday,...') - 1;
IF (@dow < 0) THEN
    CALL ...
END IF

mariadb，如何在存储过程中查找数组中元素的索引

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