Informix,在存储过程中初始化变量
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【中文标题】Informix,在存储过程中初始化变量【英文标题】:Informix, Initializing variables in a stored procedure 【发布时间】:2010-06-03 19:02:50 【问题描述】:我在 Informix 数据库上有一个存储过程。我想从该过程的执行中获取一些变量。
我不知道如何创建存储过程。
这是我目前所拥有的:
CREATE PROCEDURE foo()
RETURN somebar;
END PROCEDURE;
当我运行它时,我得到一个错误:
DEFINE somebar
我想这样做:
execute procedure foo() into bar;
如何执行过程 foo() 并将返回值放入 bar?
【问题讨论】:
【参考方案1】:这是一个插图。基本上,RETURNING 子句列出了类型(可选地后跟 AS 名称 - 但名称不声明变量);然后在过程的主体中“像往常一样”定义变量,然后返回它们。
这个特定示例是 Oracle 的 NEXT_DAY 函数的模拟,减去了全球化。该文件包含自检:
示例过程
-- @(#)$Id: next_day.spl,v 1.1 2004/10/05 21:39:18 jleffler Exp $
--
-- @(#)Create procedure equivalent to Oracle's NEXT_DAY() function.
-- Bugs: not internationalized.
CREATE PROCEDURE 'oracle'.next_day(dateval DATE, dayname CHAR(3))
RETURNING DATE AS next_date;
DEFINE rv DATE; -- Return value.
DEFINE dw INTEGER; -- Weekday corresponding to dayname.
DEFINE wd INTEGER; -- Weekday corresponding to dateval.
DEFINE dn CHAR(3);
LET rv = NULL;
IF dateval IS NOT NULL THEN
LET dw = NULL;
LET dn = UPPER(dayname);
IF dn = 'SUN' THEN LET dw = 0;
ELIF dn = 'MON' THEN LET dw = 1;
ELIF dn = 'TUE' THEN LET dw = 2;
ELIF dn = 'WED' THEN LET dw = 3;
ELIF dn = 'THU' THEN LET dw = 4;
ELIF dn = 'FRI' THEN LET dw = 5;
ELIF dn = 'SAT' THEN LET dw = 6;
END IF;
IF dw IS NOT NULL THEN
LET wd = WEEKDAY(dateval);
LET rv = dateval - wd + dw;
IF wd >= dw THEN
LET rv = rv + 7;
END IF;
END IF;
END IF;
RETURN rv;
END PROCEDURE;
自检代码
-- February 2001
-- S M Tu W Th F S
-- 1 2 3
-- 4 5 6 7 8 9 10
-- 11 12 13 14 15 16 17
-- 18 19 20 21 22 23 24
-- 25 26 27 28
CREATE TEMP TABLE test_next_day
(
ref_date DATE NOT NULL,
nxt_day CHAR(9) NOT NULL,
exp_date DATE NOT NULL
);
INSERT INTO test_next_day VALUES(MDY(02,01,2001), 'Tuesday', MDY(02,06,2001));
INSERT INTO test_next_day VALUES(MDY(02,02,2001), 'Tuesday', MDY(02,06,2001));
INSERT INTO test_next_day VALUES(MDY(02,03,2001), 'Tuesday', MDY(02,06,2001));
INSERT INTO test_next_day VALUES(MDY(02,04,2001), 'Tuesday', MDY(02,06,2001));
INSERT INTO test_next_day VALUES(MDY(02,05,2001), 'Tuesday', MDY(02,06,2001));
INSERT INTO test_next_day VALUES(MDY(02,06,2001), 'Tuesday', MDY(02,13,2001));
INSERT INTO test_next_day VALUES(MDY(02,07,2001), 'Tuesday', MDY(02,13,2001));
INSERT INTO test_next_day VALUES(MDY(02,02,2001), 'Monday', MDY(02,05,2001));
INSERT INTO test_next_day VALUES(MDY(02,02,2001), 'Wednesday', MDY(02,07,2001));
INSERT INTO test_next_day VALUES(MDY(02,02,2001), 'Thursday', MDY(02,08,2001));
INSERT INTO test_next_day VALUES(MDY(02,02,2001), 'Friday', MDY(02,09,2001));
INSERT INTO test_next_day VALUES(MDY(02,02,2001), 'Saturday', MDY(02,03,2001));
INSERT INTO test_next_day VALUES(MDY(02,02,2001), 'Sunday', MDY(02,04,2001));
SELECT ref_date, nxt_day, WEEKDAY(ref_date) AS ref_dow,
exp_date, WEEKDAY(exp_date) AS exp_dow,
NEXT_DAY(ref_date, nxt_day) AS got_date
FROM test_next_day
INTO TEMP test_next_day2;
SELECT *
FROM test_next_day2
ORDER BY ref_date, nxt_day;
SELECT "**FAILED**" AS failed, *
FROM test_next_day2
WHERE (exp_date IS NOT NULL AND got_date IS NULL)
OR (exp_date IS NULL AND got_date IS NOT NULL)
OR (exp_date IS NOT NULL AND got_date IS NOT NULL AND exp_date != got_date)
ORDER BY ref_date, nxt_day;
【讨论】:
你太棒了!我不知道该怎么说。它真的帮助了我。谢谢兄弟! @santiagobasulto:围绕 *** 网站三部曲,说“谢谢”的习惯方式是投票和/或“接受的答案”。 你是对的。对此感到抱歉。再次感谢。您是 Informix DBA 吗? @santiago:只是兼职,但就像我的个人资料所说的那样,我使用 Informix 已经很长时间了 - 还不到 25 年,但也不远了。以上是关于Informix,在存储过程中初始化变量的主要内容,如果未能解决你的问题,请参考以下文章