检查plsql中的记录IS NOT NULL

问题描述

我有一个函数可以返回类型为my_table%ROWTYPE的记录，在调用方中，我可以检查返回的记录是否为空，但是PL/SQL会抱怨if语句

I have a function which would return a record with type my_table%ROWTYPE, and in the caller, I could check if the returned record is null, but PL/SQL complains the if-statement that

这是我的代码:

v_record my_table%ROWTYPE;
v_row_id my_table.row_id%TYPE := 123456;
begin
    v_record := myfunction(v_row_id)
    if (v_record is not null) then
        -- do something
    end if;
end;

function myfunction(p_row_id in my_table.row_id%TYPE) return my_table%ROWTYPE is
    v_record_out my_table%ROWTYPE := null;
begin
    select * into v_record_out from my_table
    where row_id = p_row_id;
    return v_record_out;
end myfunction;

谢谢.

推荐答案

据我所知，这是不可能的.不过，只需检查PRIMARY KEY或NOT NULL列即可.

As far as I know, it's not possible. Checking the PRIMARY KEY or a NOT NULL column should be sufficient though.

您可以检查v_record.row_id IS NULL.

但是，当找不到记录时，您的函数将抛出NO_DATA_FOUND异常.

Your function would throw a NO_DATA_FOUND exception though, when no record is found.

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