如何在 SELECT 语句中使用 BOOLEAN 类型 [英] How to use BOOLEAN type in SELECT statement

问题描述

我有一个参数为 BOOLEAN 的 PL/SQL 函数:

I have a PL/SQL function with BOOLEAN in parameter:

function get_something(name in varchar2, ignore_notfound in boolean);

此功能是第三方工具的一部分，我无法更改.

This function is a part of 3rd party tool, I cannot change this.

我想在像这样的 SELECT 语句中使用这个函数:

I would like to use this function inside a SELECT statement like this:

 select get_something('NAME', TRUE) from dual;

这不起作用，我收到此异常:

This does not work, I get this exception:

ORA-00904:TRUE":无效标识符

ORA-00904: "TRUE": invalid identifier

据我所知，无法识别关键字 TRUE.

As I understand it, keyword TRUE is not recognized.

我怎样才能做到这一点?

How can I make this work?

推荐答案

你可以像这样构建一个包装函数:

You can build a wrapper function like this:

function get_something(name in varchar2,
                   ignore_notfound in varchar2) return varchar2
is
begin
    return get_something (name, (upper(ignore_notfound) = 'TRUE') );
end;

然后调用:

select get_something('NAME', 'TRUE') from dual;

您的版本中 ignore_notfound 的有效值是什么取决于您，我假设TRUE"表示 TRUE，其他任何表示 FALSE.

It's up to you what the valid values of ignore_notfound are in your version, I have assumed 'TRUE' means TRUE and anything else means FALSE.

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