PRAGMA EXCEPTION_INIT
Declare
L_update_text varchar2(100):=
‘update &table_name set &updated_column_name= ‘’:a’’
where &key_column_name=:a’;
begin
execute immediate L_update_text using ‘&updated_column_value’, &key_column_value;
end;
/
Declare
Invalid_column_name exception;
Pragma exception_init(Invalid_column_name,-904);
L_update_text varchar2(100):=
‘update &table_name set &updated_column_name= ‘’:a’’
where &key_column_name=:a’;
begin
execute immediate L_update_text using ‘&updated_column_value’, &key_column_value;
exception
when Invalid_column_name then
dbms_output.put_line(‘hehe’);
end;
/
异常传播：
begin
begin
begin
begin
begin
declare
fname employees.first_name%type;
begin
select first_name into fname from employees where 1=2;
--exception
--when NO_DATA_FOUND then
-- dbms_output.put_line(‘block 6’);
end;
exception
when NO_DATA_FOUND then
dbms_output.put_line(‘block 5’);
end;
exception
when NO_DATA_FOUND then
dbms_output.put_line(‘block 4’);
end;
exception
when NO_DATA_FOUND then
dbms_output.put_line(‘block 3’);
end;
exception
when NO_DATA_FOUND then
dbms_output.put_line(‘block 2’);
end;
exception
when NO_DATA_FOUND then
dbms_output.put_line(‘block 1’);
end;
/
作用域和可视性：
begin
declare
nested_excp exception;
begin
raise nested_excp;
end;
exception
when nested_excp then
dbms_output.put_line('haha');
end;
/
when others then
放在最后
begin
declare
nested_excp exception;
begin
raise nested_excp;
end;
exception
when others then
dbms_output.put_line('haha');
dbms_output.put_line(sqlcode || ‘ is ’ || sqlerrm);
raise;
end;
/
SQLCODE SQLERRM
declare
l_dept departments%rowtype;
begin
l_dept.department_id:=100;
l_dept.department_name:=’HR’;
insert into departments(department_id, department_name)
values(l_dept.department_id, l_dept.department_name);
Exception
When others then
dbms_output.put_line(sqlcode || ‘ is ’ || sqlerrm);
end;
/
declare
l_dept departments%rowtype;
begin
l_dept.department_id:=100;
l_dept.department_name:=’HR’;
insert into departments(department_id, department_name)
values(l_dept.department_id, l_dept.department_name);
Exception
When others then
Raise_application_error(-20001, ‘error message!’);
End;
/
