PLSQL_包、定时任务

/****************************************005 PL/SQL 包、定时任务 *********************************/

/**
(1)包PACKAGE
DBMS_OUTPUT
DBMS_LOB
DBMS_JOB..
包(包头、包体)
包头: 公共类型的变量、常量、异常、过程、函数等的声明。
包体：私有类型的变量、常量、异常、过程、函数等的声明以及包头内的过程、函数的实现

(2)包规范[包头]
CREATE [OR REPLACE]
PACKAGE <package_name>
IS|AS
[Public item declarations]
[Subprogram specification]
END [package_name];

(3)包规范[包体]
CREATE [OR REPLACE]
PACKAGE BODY <package_nams>
IS|AS
[Private item declarations]
[Subprogram bodies]
[BEGIN Initialization]
END [package_name];

(4)程序包的优点
模块化
更轻松的应用程序设计
信息隐藏
新增功能
性能更佳

*/

/**
-- 01 包示例
-- 实验准备
CREATE TABLE STUDENT (STU_NO NUMBER(3), NAME VARCHAR2(10), SCORE NUMBER(3));
INSERT INTO STUDENT VALUES (1 , '小小', 99);
INSERT INTO STUDENT VALUES (2 , '小G', 80);
INSERT INTO STUDENT VALUES (3 , '诺诺', 98);
INSERT INTO STUDENT VALUES (4 , '小北', 79);
COMMIT;
SELECT * FROM STUDENT;
*/

-- 包头
CREATE OR REPLACE PACKAGE PACK1
IS
V_A INT := 9;
--定义显示游标1
CURSOR MYCURSOR1 RETURN STUDENT%ROWTYPE;
--定义参照游标1
TYPE REFCUR1 IS REF CURSOR;

--定义参照游标2
TYPE REFCUR2 IS REF CURSOR;

PROCEDURE INSERT_STUDENT(P1 IN STUDENT%ROWTYPE);
PROCEDURE UPDATE_STUDENT(P2 IN STUDENT%ROWTYPE);
--定义过程中使用显示游标
PROCEDURE MYCURSOR1_USE;
--定义过程中使用参照游标1
PROCEDURE REFCUR1_USE;
--定义过程中使用参照游标2
PROCEDURE REGCUR2_USE(P_NO IN NUMBER, P_CURSOR OUT PACK1.REFCUR2);

END PACK1;

-- 包体
CREATE OR REPLACE PACKAGE BODY PACK1
IS
V_B INT := 5;

CURSOR MYCURSOR1 RETURN STUDENT%ROWTYPE
IS
SELECT * FROM STUDENT;

PROCEDURE INSERT_STUDENT(P1 IN STUDENT%ROWTYPE)
IS
BEGIN
INSERT INTO STUDENT(STU_NO, NAME, SCORE)
VALUES(P1.STU_NO, P1.NAME, P1.SCORE);
COMMIT;
END;

PROCEDURE UPDATE_STUDENT(P2 IN STUDENT%ROWTYPE)
IS
BEGIN
UPDATE STUDENT SET NAME = P2.NAME, SCORE = P2.SCORE
WHERE STU_NO = P2.STU_NO;
COMMIT;
END;

PROCEDURE MYCURSOR1_USE
IS
V_STU STUDENT%ROWTYPE;
BEGIN
OPEN MYCURSOR1;
LOOP
FETCH MYCURSOR1 INTO V_STU;
EXIT WHEN MYCURSOR1%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('学号为:' || V_STU.STU_NO || '姓名为:' || V_STU.NAME);
END LOOP;
CLOSE MYCURSOR1;
END MYCURSOR1_USE;

PROCEDURE REFCUR1_USE
IS
MYREFCUR1 REFCUR1;
V_STU STUDENT%ROWTYPE;
BEGIN
OPEN MYREFCUR1 FOR SELECT * FROM STUDENT;
LOOP
FETCH MYREFCUR1 INTO V_STU;
EXIT WHEN MYREFCUR1%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('学号为:' || V_STU.STU_NO || '姓名为:' || V_STU.NAME);
END LOOP;
CLOSE MYREFCUR1;
END;


PROCEDURE REGCUR2_USE(P_NO IN NUMBER, P_CURSOR OUT PACK1.REFCUR2)
IS
BEGIN
OPEN P_CURSOR FOR SELECT * FROM EMP WHERE DEPTNO = P_NO;
END;

END PACK1;

--查看包信息
SELECT OBJECT_NAME, OBJECT_TYPE FROM USER_OBJECTS
WHERE OBJECT_TYPE IN ('PROCEDURE','FUNCTION','PACKAGE','PACKAGE BODY');
--调用PACK1.REGCUR2_USE
DECLARE
MYCURSOR PACK1.REFCUR2;
V_EMP EMP%ROWTYPE;
BEGIN
PACK1.REGCUR2_USE(10,MYCURSOR);
LOOP
FETCH MYCURSOR INTO V_EMP;
EXIT WHEN MYCURSOR%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('姓名为:' || V_EMP.ENAME);
END LOOP;
END;

/**
定时任务
*/
/**
-- 实验准备
CREATE TABLE TEST(A DATE);

CREATE OR REPLACE PROCEDURE PROC_TEST
IS
BEGIN
INSERT INTO TEST VALUES (SYSDATE);
END;
*/
/**
--定义任务
VARIABLE job1 NUMBER;
BEGIN
DBMS_JOB.SUBMIT(:job1, 'PROC_TEST;', SYSDATE, 'SYSDATE+1/1440');
END;
--运行任务
BEGIN
DBMS_JOB.RUN(:job1);
END;
--删除任务
BEGIN
DBMS_JOB.REMOVE(:job1);
END;
SELECT * FROM TEST;

*/