Oracle Procedure 没有正常工作？

Question

SPOOL /Users/gongjiaxi/Desktop/solution2
SET ECHO ON
SET FEEDBACK ON
SET LINESIZE 100
SET PAGESIZE 200
SET SERVEROUTPUT ON
create PROCEDURE INSERT_ORDER_DETAIL(order_id ORDER_DETAIL.ORDER_ID%TYPE,
                                     product_name ORDER_DETAIL.PRODUCT_NAME%TYPE,
                                     unit_price ORDER_DETAIL.UNIT_PRICE%TYPE,
                                     quantity ORDER_DETAIL.QUANTITY%TYPE,
                                     discount ORDER_DETAIL.DISCOUNT%TYPE)
    IS
    discontinued PRODUCT.DISCONTINUED%TYPE;
BEGIN
    IF discontinued = 'N' THEN
        INSERT INTO ORDER_DETAIL(ORDER_ID, PRODUCT_NAME, UNIT_PRICE, QUANTITY, DISCOUNT)
        VALUES (order_id, product_name, unit_price, quantity, discount);
    end if;
    IF discontinued = 'Y' THEN
        DBMS_OUTPUT.PUT_LINE('The product is not availiable');
    end if;
end;
/
EXECUTE INSERT_ORDER_DETAIL(1000,'Chai',18.00,1002,0.9);
EXECUTE INSERT_ORDER_DETAIL(1000,'Alice Mutton', 39.00,1000,0.8);

SPOOL OFF

但是结果是

Procedure INSERT_ORDER_DETAIL compiled

SQL> EXECUTE INSERT_ORDER_DETAIL(1000,'Chai',18.00,1002,0.9);

PL/SQL procedure successfully completed.

SQL> EXECUTE INSERT_ORDER_DETAIL(1000,'Alice Mutton', 39.00,1000,0.8);

PL/SQL procedure successfully completed."

我执行的两条数据，一条应该插入一条数据到table，另一条应该调用DBMS_OUTPUT。但是 none 他们成功了。

Answer 1

您声明了变量 discontinued PRODUCT.DISCONTINUED%TYPE; 而没有用值对其进行初始化，因此它的值是 NULL。
然后在该过程中，您将在 IF 语句
中检查此变量的值但是 NULL 既不是 Y 也不是 N，因此该过程什么都不做。

Answer 2

您需要获取 product table 停产的产品，然后在 IF 条件下使用它。

...
...
IS
    discontinued PRODUCT.DISCONTINUED%TYPE;
BEGIN
Select discontinued -- this is column name from your product table
Into discontinued -- this is a variable declared in your procedure
From product 
where name = product_name;
-- name is column name of the product table
-- product_name is input parameter of the procedure

IF discontinued = 'N' THEN
...
...

Suggestion：variable/parameter 的名称与 table 的列名称不同。

Oracle Procedure 没有正常工作？

Oracle Procedure does not work as it should?

oracle

plsql

sqlplus