一、建立視圖
CREATE? OR REPLACE VIEW myview
AS
SELECT * FROM dept WHERE deptno>20
WITH CHECK OPTION;

二、建立只讀視圖
CREATE? OR REPLACE VIEW myview
AS
SELECT * FROM dept WHERE deptno>20
WITH READ ONLY;

三、建立同義詞
CREATE SYNONYM dept FOR scott.dept;

三、建立公共同義詞
CREATE PUBLIC SYNONYM dept FOR scott.dept;

四、建立序列
CREATE SEQUENCE myseq
START WITH 3
INCREMENT BY 2
ORDER
MAXVALUE 8
MINVALUE 2
NOCYCLE;

四、查詢序列值
select myseq.currval,myseq.nextval from dual;

五、修改序列
ALTER SEQUENCE myseq MAXVALUE 12;
不能修改currval

六、事務(wù)體現(xiàn)
Ａ用戶：
SELECT * FROM dept FOR UPDATE;
此時Ｂ用戶作更新操作時會處于一直等待Ａ完成狀態(tài)：
UPDATE dept SET deptname="fsda" WHERE deptno='001';

七、行級觸發(fā)器
１、:old表
CREATE OR REPLACE TRIGGER del_deptid
AFTER DELETE ON dept
FOR EACH ROW
BEGIN
DELETE FROM emp WHERE id=:old.id;
END del_deptid;

２、:new表
CREATE OR REPLACE TRIGGER insert_dept
AFTER INSERT ON dept
FOR EACH ROW
BEGIN
INSERT INTO emp(eid,ename,id) VALUES('121','QWERT',:new.id);
END;

３、觸發(fā)器內(nèi)不允許再寫commit和rollback語句的替代方法
CREATE OR REPLACE TRIGGER books_delete
AFTER DELETE ON books
FOR EACH ROW
BEGIN
IF :old.books_id='0001' THEN
RAISE_APPLICATION_ERROR(-20000,'不允許刪除！');
END IF;
END;

八、語句級觸發(fā)器
CREATE TABLE mylog(curr_user VARCHAR2(100),curr_date date,act CHAR(1));

CREATE OR REPLACE TRIGGER dml_aa
AFTER INSERT OR DELETE OR UPDATE
BEGIN
IF INSERTING THEN
INSERT INTO mylog VALUES(user,sysdate,'I');
ELSEIF DELETING THEN
INSERT INTO mylog VALUES(user,sysdate,'D');
ELSE
INSERT INTO mylog VALUES(user,sysdate,'U');
END IF;
END;

九、替換觸發(fā)器（Oracle中只能建在視圖上）
CREATE OR REPLACE TRIGGER tr_v_e_d
INSTEAD OF INSERT ON v_emp_dept
FOR EACH ROW
BEGIN
INSERT INTO deptment VALUES(:new.id,:new.name);
INSERT INTO emp(eid,ename,sex,id) VALUES(:new.eid,:new.ename,:new.sex,:new.id);
END;

十、授權(quán)
grant execute on tt.proc01 to test;
grant all on scott.dept to test with grant option;
grant creat user to test with admin option;

八、角色
CREATE ROLE myrole;
GRANT SELECT on scott.dept TO myrole;
GRANT myrole TO jerry;

九、表空間
CREATE TABLESPACE tabs DATAFILE 'c:/oracle/product/10.1.0/oradata/test/tabs.dbf' SIZE 10M
GRANT UNLIMITED TABLESPACE,DBA TO test;
CREATE TABLE ty(t CHAR(10)) TABLESPACE tabs;

中科院Oracle培訓(xùn)視頻筆記(6)