oracle函数中的Nullable返回类型
发布时间:2021-03-09 14:11:45 所属栏目: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;
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; (编辑:开发网_开封站长网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |