Oracle數據庫實驗應用

授權：

create user tempUser identified by sa 
default tablespace users
 temporary tablespace temp quota unlimited on users;

create profile tempprofile LIMIT
SESSIONS_PER_USER 3
CPU_PER_CALL 2000
IDLE_TIME 15
LOGICAL_READS_PER_CALL 200
FAILED_LOGIN_ATTEMPTS 2;

--爲用戶指定配置文件

alter user tempUser profile tempprofile;

--爲用戶授的權限

grant create session to tempUser;

grant select on student to tempUser;

connect tempUser/sa;


--撤銷用戶權限
revoke select on system.student from tempUser;

revoke create session from tempUser;

 
 

視圖：

create or replace view Student_Math as 
select * from student 
where sclass in (
select c.name from class c ,department d 
where c.department=d.did
and d.DNAME='數學系')
with check opition;
)


create or replace view department_Class as select d.dnam,c,cname
from class c,department d
where c.department=d.did;

select text from user_views where view_name=UPPER('Student_Math');

序列：

drop table sequence_table ;
create table sequence_table(
id number,
op varchar2(20)
)
/

drop sequence Incr_id;
create sequence Incr_id
start with 100
increment by 1
nomaxvalue
nocycle
order;
/

 create or replace trigger Incr_trigger
before insert on sequence_table
for each row
declare 
next_no number;
begin 
select Incr_id.nextval
into next_no
from dual;
:NEW.ID :=next_no ;
end;
/

--test

insert into sequence_table(op) values('INSERT');

select * from sequence_table;

--查看序列狀態

select * from user_sequences where sequence_name=UPPER('Incr_id');

事物：

--事物的隔離級別爲 read committed
set transaction isolation level read committed;

select sname from student;
--要是不提交就會報上一個事物還沒有處理
commit;

--Serializable
set transaction isolation level serializable;

select sname,age from student;

update student set age=23
where sname='李小龍';
--rollback;
rollback;
select sname,age from student;

--savepoint section 存儲點

存儲過程：

set serveroutput on;
create or replace procedure PrintStudentInfo is 

begin 
 
for s_current in (select * from student) loop 
dbms_output.put(s_current.sno || '\');
dbms_output.put(s_current.sname || '\');
dbms_output.put_line(s_current.age);
end loop;
 
end PrintStudentInfo;
/

exec PrintStudentInfo;


create or replace procedure GetStudentInfo(ID in varchar2) is 
type StudentInfo is record(
sID student.sno%type,
sName student.sname%type,
className course.Cname%type

);

v_studentInfo StudentInfo ;
begin 
select s.sno,s.sname,c.cname
into v_studentInfo 
from student s join course c
on s.sclass=c.sid
where s.sno=ID;

dbms_output.put(v_studentInfo.SID || '\');
dbms_output.put(v_studentInfo.Sname || '\');
dbms_output.put(v_studentInfo.className || '\');

exception when no_data_found then 
dbms_output.put_line('not found this student');
end GetStudentInfo;
/

declare 
studentID varchar2(20):='804';
begin GetStudentInfo(id=>studentID);
end;
/

觸發器：

drop table student_log;
create table student_log(
who varchar2(30),
ActionType varchar2(10),
ModelDate timestamp
);

--觸發
create or replace trigger InsertLog_trigger
after insert on student
begin
insert into student_log values(user,'INSERT',sysdate);
end;
/

insert into student(sno,age,sname) values(222190912,23,'李小龍');

select * from student_log;

alter table student_log add Student_ID varchar2(10);

alter trigger insertlog_trigger disable;

create or replace trigger insert_row_log_trigger
before insert on student 
referencing new as new_value
for each row
begin 
insert into student_log 
values(user,'INsert',sysdate,:new_value.SNO) ;
end;
/

insert into student(sno,age,sname) values(32565132,231,'成長倫');

select * from student_log;

--test

備份：

-- exp system/manager@ORCL file=d:\daochu.dmp log=d:\logs\log.log full=y

imp system/sa@ORCL  full=y  file=d:\daochu.dmp log=d:\logs\log.log ignore=y