是PL / SQL的新手,我无法理解如何在过程中管理用户定义的异常。我的代码给出警告“过程已完成,但有编译错误”。
CREATE OR REPLACE PROCEDURE raise_salary
(eid IN employees.e_id%TYPE:=&emp_id,
raise IN employees.salary:=&salary_raise)
IS
cnt INTEGER;
salary employees.salary%TYPE;
BEGIN
SELECT count(*) INTO cnt FROM employees WHERE e_id=eid;
IF cnt=0 THEN
RAISE INVALID_ID;
ELSE
SELECT salary INTO sal FROM employees WHERE e_id=eid;
IF sal IS NULL THEN
RAISE NULL_VALUE;
ELSE
UPDATE employees SET salary=salary+raise WHERE e_id=eid;
dbms_output.put_line('Salary raised!');
END IF;
END IF;
EXCEPTION
WHEN INVALID_ID THEN
dbms_output.put_line('User ID does not exist!');
WHEN NULL_VALUE THEN
dbms_output.put_line('Salary is null in table!');
WHEN others THEN
dbms_output.put_line('Error!');
END;
/
示例:
SQL> CREATE OR REPLACE PROCEDURE testException
2 IS
3 BEGIN
4 raise INVALID_ID;
5 EXCEPTION
6 WHEN INVALID_ID THEN
7 dbms_output.put_line('Invalid ID');
8 END;
9 /
Warning: Procedure created with compilation errors.
了解错误的方法:
SQL> sho err
Errors for PROCEDURE TESTEXCEPTION:
LINE/COL ERROR
-------- -----------------------------------------------------------------
0/0 PL/SQL: Compilation unit analysis terminated
4/5 PL/SQL: Statement ignored
4/11 PLS-00201: identifier 'INVALID_ID' must be declared
6/10 PLS-00201: identifier 'INVALID_ID' must be declared
您需要声明使用的异常:
SQL> CREATE OR REPLACE PROCEDURE testException
2 IS
3 INVALID_ID exception;
4 BEGIN
5 raise INVALID_ID;
6 EXCEPTION
7 WHEN INVALID_ID THEN
8 dbms_output.put_line('Invalid ID');
9 END;
10 /
Procedure created.