function 中不存在 Postgres 列

Question

在我的查詢中，我收到如下錯誤消息：

錯誤：列“pw”不存在

LINE 1: SELECT (pw = $2) FROM user ^ QUERY: SELECT (pw = $2) FROM user WHERE user_name = $1

上下文：PL/pgSQL function public.check_password(text,text) line 4 at SQL statement

SQL state: 42703

CREATE OR REPLACE FUNCTION check_password(i VARCHAR, pwd VARCHAR)
RETURNS BOOLEAN AS $$
DECLARE passed Boolean;
    BEGIN
    
        SELECT (u.pw = pwd) into passed
        From public.user u
        where u.user_name = i;
        return passed;
        
    END;
    
$$ LANGUAGE plpgsql;

select check_password('userf','12345');  

Answer 1

您的 function 有效，但您可能需要考慮null案例。 演示

CREATE OR REPLACE FUNCTION check_password(i text, pwd text)
RETURNS BOOLEAN AS $$
DECLARE passed Boolean;
    BEGIN
    
        SELECT (u.pw = pwd) into passed
        From public.user u
        where u.user_name = i;
        
        if passed is null then  passed := false; end if;
        
        return passed;
        
    END;
    
$$ LANGUAGE plpgsql;