如何编写pl sql异常语句要求用户以特定格式输入

Question

CREATE OR REPLACE PROCEDURE get_productdetails(

   p_reqid   OUT requirement.req_id%type,

   p_pid     OUT requirement.p_id%type,

   p_rstaffid OUT requirement.r_staff_id%type,
   
   p_demand  requirement.demand%type)

IS

CURSOR c_demand IS

SELECT req_id,p_id,r_staff_id from requirement where demand = upper(p_demand);

BEGIN

FOR i in c_demand Loop

DBMS_OUTPUT.PUT_LINE('Requirement ID :'||i.req_id);

DBMS_OUTPUT.PUT_LINE('Product ID'||i.p_id);

DBMS_OUTPUT.PUT_LINE('Staff ID :'||i.r_staff_id);

END LOOP;

END get_productdetails;

用户必须在'HIGH/LOW/AVG中输入需求，否则它会抛出异常要求以该格式输入数据你能帮我写一个相应的例外吗

Answer 1

由于我无法访问您的 table 结构，因此以下代码未经测试。一个好的起点是官方 oracle documentation。在你的情况下，需要一个用户定义的异常，你需要在声明部分声明，然后 RAISE 最后在 EXCEPTION 块中捕获。

CREATE OR REPLACE PROCEDURE get_productdetails(
   p_reqid   OUT requirement.req_id%type,
   p_pid     OUT requirement.p_id%type,
   p_rstaffid OUT requirement.r_staff_id%type,
   p_demand  requirement.demand%type)
IS
  -- declare the user-defined exception
  invalid_input EXCEPTION;
  CURSOR c_demand IS
  SELECT req_id,p_id,r_staff_id from requirement where demand = upper(p_demand);
BEGIN
  IF p_demand NOT IN ('HIGH','LOW','AVG') THEN
    -- raise the exception if p_demand not one of the 3 accepted values
    RAISE invalid_input;
  END IF;
  FOR i in c_demand Loop
  DBMS_OUTPUT.PUT_LINE('Requirement ID :'||i.req_id);
  DBMS_OUTPUT.PUT_LINE('Product ID'||i.p_id);
  DBMS_OUTPUT.PUT_LINE('Staff ID :'||i.r_staff_id);
  END LOOP;
EXCEPTION WHEN  invalid_input THEN
  dbms_output.put_line('Only HIGH/LOW/AVG are valid input');  
END get_productdetails;

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