PL/SQL异常获取

1.no_data

SET SERVEROUTPUT ON
DECLARE pename EMP.ENAME % TYPE ;
BEGIN
    SELECT
        ename INTO pename
    FROM
        emp
    WHERE
        empno = 1234 ; EXCEPTION
    WHEN no_data_found THEN
        dbms_output.put_line ('没有找到该员工') ;
    WHEN others THEN
        dbms_output.put_line ('其他例外未知') ;
    END ;
  /

2.too_many_rows匹配多行

 SET SERVEROUTPUT ON
 DECLARE pename EMP.ENAME % TYPE ;
 BEGIN
     SELECT
         ename INTO pename
     FROM
         emp
     WHERE
         deptno = 10 ; EXCEPTION
     WHEN too_many_rows THEN
         dbms_output.put_line (
             'select inti 匹配了多行'
         ) ;
     WHEN others THEN
         dbms_output.put_line ('其他例外') ;
     END ;
 /

3.zero_divide

 SET SERVEROUTPUT ON
 DECLARE pnum NUMBER ;
 BEGIN
     pnum := 1 / 0 ; EXCEPTION
 WHEN zero_divide THEN
     DBMS_OUTPUT.PUT_LINE ('1/0 不能做除数') ; dbms_output.put_line ('零不能做除数') ;
 WHEN others THEN
     dbms_output.put_line ('其他错误') ;
 END ;
 /

4.VALUE_ERROR

 SET SERVEROUTPUT ON
 DECLARE pnum NUMBER ;
 BEGIN
     pnum := 'abc' ; EXCEPTION
 WHEN VALUE_ERROR THEN
     DBMS_OUTPUT.PUT_LINE ('字符转换错误') ;
 WHEN others THEN
     dbms_output.put_line ('其他错误') ;
 END ;
 /