oracle函数中的Nullable返回类型
发布时间:2021-03-13 06:15:07 所属栏目:站长百科 来源:网络整理
导读:是否可以从oracle函数返回null? 我有以下oracle函数: create or replace function vta.GetAmount(p_month NUMBER) return number is v_amount number(9);begin select amount into v_amount from salary where salary.month = p_month; return v_amount;en
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是否可以从oracle函数返回null? 我有以下oracle函数: create or replace function vta.GetAmount(p_month NUMBER)
return number is
v_amount number(9);
begin
select amount
into v_amount
from salary
where salary.month = p_month;
return v_amount;
end GetAmount;
当select语句返回零行时,它会引发以下异常: 在这种情况下,我希望该函数返回null. 解决方法create or replace function vta.GetAmount(p_month NUMBER)
return number is
v_amount number(9);
begin
select amount
into v_amount
from salary
where salary.month = p_month;
return v_amount;
exception -- code to handle no data
when no_data_found then
return null;
end GetAmount;
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