如何将布尔数据类型作为存储过程的参数传递？

Posted 2023-04-18

【中文标题】如何将布尔数据类型作为存储过程的参数传递？

【英文标题】：How do you pass a boolean data type as a parameter for a stored procedure?

【发布时间】：2018-07-17 19:55:31

【问题描述】：

假设您有一个接受单个参数的现有存储过程，该参数恰好是the BOOLEAN Informix data type：

test_bool_param(BOOLEAN)

对于这样的存储过程，EXECUTE PROCEDURE 语句会是什么样子？

这是我尝试过但失败的方法：

EXECUTE PROCEDURE test_bool_param('true'); -- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param('false');-- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param('TRUE'); -- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param('FALSE');-- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param(true);   -- [Error Code:  -201, SQL State: 42000]  A syntax error has occurred.
EXECUTE PROCEDURE test_bool_param(false);  -- [Error Code:  -201, SQL State: 42000]  A syntax error has occurred.
EXECUTE PROCEDURE test_bool_param(TRUE);   -- [Error Code:  -201, SQL State: 42000]  A syntax error has occurred.
EXECUTE PROCEDURE test_bool_param(FALSE);  -- [Error Code:  -201, SQL State: 42000]  A syntax error has occurred.
EXECUTE PROCEDURE test_bool_param(1);      -- [Error Code:  -674, SQL State: IX000]  Routine (test_bool_param) can not be resolved.
EXECUTE PROCEDURE test_bool_param(0);      -- [Error Code:  -674, SQL State: IX000]  Routine (test_bool_param) can not be resolved.
EXECUTE PROCEDURE test_bool_param('\1');   -- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param('\0');   -- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param('t');    -- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param('f');    -- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param('T');    -- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param('F');    -- [Error Code: -1260, SQL State: IX000]  It is not possible to convert between the specified types.
EXECUTE PROCEDURE test_bool_param(t);      -- [Error Code:  -201, SQL State: 42000]  A syntax error has occurred.
EXECUTE PROCEDURE test_bool_param(f);      -- [Error Code:  -201, SQL State: 42000]  A syntax error has occurred.
EXECUTE PROCEDURE test_bool_param(T);      -- [Error Code:  -201, SQL State: 42000]  A syntax error has occurred.
EXECUTE PROCEDURE test_bool_param(F);      -- [Error Code:  -201, SQL State: 42000]  A syntax error has occurred.
EXECUTE PROCEDURE test_bool_param(\1);     -- [Error Code:  -202, SQL State: IX000]  An illegal character has been found in the statement.
EXECUTE PROCEDURE test_bool_param(\0);     -- [Error Code:  -202, SQL State: IX000]  An illegal character has been found in the statement.

【参考方案1】：

这些EXECUTE PROCEDURE 调用做实际上成功了：

EXECUTE PROCEDURE test_bool_param('t');     -- Result set fetched - SUCCESS
EXECUTE PROCEDURE test_bool_param('f');     -- Result set fetched - FAILURE
EXECUTE PROCEDURE test_bool_param('T');     -- Result set fetched - SUCCESS
EXECUTE PROCEDURE test_bool_param('F');     -- Result set fetched - FAILURE

但仅当存储过程中的任何检查也与't'、'f'、'T' 或 'F' 之一进行比较时：

CREATE PROCEDURE test_bool_param
(in_param BOOLEAN)
RETURNING VARCHAR(8)
IF (in_param = 't') THEN
        RETURN 'SUCCESS';
ELSE
        RETURN 'FAILURE';
END IF;
END PROCEDURE;

【讨论】：

来自文档：You can compare two BOOLEAN values to test for equality or inequality. You can also compare a BOOLEAN value to the Boolean literals 't' and 'f'. BOOLEAN values are not case-sensitive; 't' is equivalent to 'T' and 'f' to 'F'.，所以是的，它适用于您成功执行该过程时使用的文字。

@LuísMarques 这来自什么文档？问题中链接的 IBM 官方文档仅提及 '\0' 和 '\1'，两者都不起作用。

其实在Guide to SQL: Reference，数据类型部分：Description of Data Types