Redshift 存储过程无法按预期工作答案

【问题标题】：Redshift Stored Procedure Can't Work as ExpectedRedshift 存储过程无法按预期工作
【发布时间】：2021-01-26 15:08:05
【问题描述】：

我在 Redshift 中创建并成功运行了存储过程，但没有按预期工作。例如，我想删除参数设置的时间段内的数据。

-- 存储过程

CREATE OR REPLACE PROCEDURE sp_test(parm0 varchar(100), parm1 date, parm2 date)
AS '
BEGIN
  EXECUTE
    $_$ DELETE FROM test_table_b
    WHERE $_$|| parm0 ||$_$ 
    between $_$|| parm1 ||$_$ and $_$|| parm2 ||$_$ $_$;
end;
' language plpgsql;

-- 运行存储过程

Begin;
Call sp_test('opsdt', '2021-01-16', '2021-01-17');
Commit;

-- 结果

BEGIN executed successfully

Execution time: 0.07s
Statement 1 of 3 finished

0 rows affected
Call executed successfully

Execution time: 0.18s
Statement 2 of 3 finished

COMMIT executed successfully

Execution time: 0.13s
Statement 3 of 3 finished


Script execution finished
Total script execution time: 0.38s

脚本运行成功，但记录“2021-01-16”和“2021-01-17”仍保留在该表中。

任何建议将不胜感激。提前致谢。

【问题讨论】：

也许使用RAISE NOTICE 来输出DELETE 语句，以确认它包含您期望的变量？
@John Rotenstein 非常感谢您的有用建议，约翰！似乎需要适当的报价。无论有没有 RAISE NOTICE，它现在都成功了。但是 RAISE NOTICE 可以帮助我了解实际执行的查询是警告并且非常有用。我真的很感谢你的好意。祝你有美好的一天:)

标签： amazon-web-services stored-procedures amazon-redshift

【解决方案1】：

感谢@John Rotenstein，现在我可以按预期运行存储过程。对于遇到相同问题的人来说只是一个简单的例子。

-- 修改程序

CREATE OR REPLACE PROCEDURE sp_del_test(tbl_name varchar(50), col_name varchar(50), start_dt date, end_dt date)
AS $PROC$
DECLARE
    sql        VARCHAR(MAX) := '';
BEGIN

 sql := 'DELETE FROM ' || tbl_name || ' WHERE ' || col_name || ' BETWEEN ''' || start_dt || ''' AND ''' || end_dt || '''';
 
  RAISE INFO '%', sql;
  EXECUTE sql;
END;    
$PROC$ language plpgsql;

-- 执行的命令

Begin;
Call sp_del_test('test_table_b', 'opsdt', '2021-01-23', '2021-01-24');
Commit;

-- 返回消息

BEGIN executed successfully

Execution time: 0.05s
Statement 1 of 3 finished

**Warnings:
DELETE FROM test_table_b WHERE opsdt BETWEEN '2021-01-23' AND '2021-01-24'**

0 rows affected
Call executed successfully

Execution time: 0.2s
Statement 2 of 3 finished

COMMIT executed successfully

Execution time: 0.12s
Statement 3 of 3 finished


Script execution finished
Total script execution time: 0.38s

【讨论】：