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 ;
/