Oracle笔记 七、PL/SQL 异常处理
–异常处理
declare
sNum number := 0;
begin
sNum := 5 / sNum;
dbms_output.put_line(sNum);
exception
when others then
dbms_output.put_line(‘is Error!’);
end;
–自定义异常
declare
ex_custom_invaild_age exception; –自定义的异常myerr
age int;
begin
age := &请输入年龄;
if (age < 0) then
raise ex_custom_invaild_age; –引发自定义异常
else
dbms_output.put_line(‘年龄是：’ || age);
end if;
exception
when ex_custom_invaild_age then
dbms_output.put_line(‘非法的年龄’);
end;
–引发应用程序异常
–raise_application_error(异常编号，说明);
declare
age int;
begin
age := &请输入年龄;
if (age < 0) then
raise_application_error(-20500, ‘年龄不能为负数’);
else
dbms_output.put_line(‘年龄是：’ || age);
end if;
end;
–非预定义异常
declare
ex_custom_error exception;
pragma exception_init(ex_custom_error, -1); –把一个编号和一个自定义异常关联，
–相当于把-1编号的异常命名为ex_custom_error，这样就可以捕获这种异常
begin
insert into dept values(10, ‘aaa’, ‘bbb’);
exception
when ex_custom_error then
dbms_output.put_line(‘部门编号已经存在’);
end;
–异常处理
declare
vSal emp.sal%type;
begin
select sal into vSal from emp;
exception
when too_many_rows then
dbms_output.put_line(‘多条数据’);
when others then
dbms_output.put_line(‘Error’);
end;
declare
vSal emp.sal%type;
begin
select sal into vSal from emp where empno = 1;
exception
when no_data_found then
dbms_output.put_line(‘没有数据’);
when others then
dbms_output.put_line(‘Error’);
end;
–异常日志处理
create table errorLog (
id number primary key,
errCode number,
errMsg varchar2(1024),
errDate date
);
–创建序列，从1开始，每次加1
create sequence seq_errorLog_id start with 1 increment by 1;
declare
vDeptno dept.deptno%type := 10;
vErrCode number;
vErrMsg varchar2(1024);
begin
delete from dept where deptno = vDeptno;
commit;
exception
when others then
rollback;
vErrCode := SQLCODE;
vErrMsg := SQLERRM;
insert into errorLog values(seq_errorLog_id.nextval, vErrCode, vErrMsg, sysdate);
commit;
end;
select * from errorLog;
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