oracle函数中的Nullable返回类型
发布时间:2021-03-13 16:09:49  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;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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