Oracle数据库---包

--根据员工号或员工姓名获取员工的信息
--根据员工号或员工姓名删除员工的信息
--创建包规范
CREATE OR REPLACE PACKAGE overload_pkg
IS
FUNCTION get_info(eno NUMBER) RETURN emp%ROWTYPE;
FUNCTION get_info(name VARCHAR2) RETURN emp%ROWTYPE;

PROCEDURE del_emp(eno NUMBER);
PROCEDURE del_emp(name VARCHAR2);
END;

--创建包体
CREATE OR REPLACE PACKAGE BODY overload_pkg
IS
FUNCTION get_info(eno NUMBER) RETURN emp%ROWTYPE
IS
emp_record emp%ROWTYPE;
BEGIN
SELECT * INTO emp_record FROM emp WHERE empno = eno;
RETURN emp_record;
EXCEPTION
WHEN NO_DATA_FOUND THEN
RAISE_APPLICATION_ERROR(-20020,'不存在此员工！');
END;

FUNCTION get_info(name VARCHAR2) RETURN emp%ROWTYPE
IS
emp_record emp%ROWTYPE;
BEGIN
SELECT * INTO emp_record FROM emp WHERE ename = name;
RETURN emp_record;
EXCEPTION
WHEN NO_DATA_FOUND THEN
RAISE_APPLICATION_ERROR(-20020,'不存在此员工！');
END;

PROCEDURE del_emp(eno NUMBER)
IS
BEGIN
DELETE FROM emp WHERE empno = eno;
IF SQL%NOTFOUND THEN
RAISE_APPLICATION_ERROR(-20020,'不存在此员工');
END IF;
END;

PROCEDURE del_emp(name VARCHAR2)
IS
BEGIN
DELETE FROM emp WHERE ename = name;
IF SQL%NOTFOUND THEN
RAISE_APPLICATION_ERROR(-20020,'不存在此员工');
END IF;
END;
END;

--调用
--根据员工号查询员工信息
DECLARE
emp_record emp%rowtype;
e_no_emp EXCEPTION;
PRAGMA EXCEPTION_INIT(e_no_emp,-20020);
BEGIN
emp_record:= overload_pkg.get_info(&no);
DBMS_OUTPUT.PUT_LINE('员工号：'||emp_record.empno||'姓名：'||emp_record.ename||'工资：'||emp_record.sal);
EXCEPTION
WHEN e_no_emp THEN
DBMS_OUTPUT.put_line(SQLERRM);
END;

--根据员工姓名查询员工信息
DECLARE
emp_record emp%rowtype;
e_no_emp EXCEPTION;
PRAGMA EXCEPTION_INIT(e_no_emp,-20020);
BEGIN
emp_record:= overload_pkg.get_info('&name');
DBMS_OUTPUT.PUT_LINE('员工号：'||emp_record.empno||'姓名：'||emp_record.ename||'工资：'||emp_record.sal);
EXCEPTION
WHEN e_no_emp THEN
DBMS_OUTPUT.put_line(SQLERRM);
END;

--根据员工号删除员工信息
DECLARE
e_no_emp EXCEPTION;
PRAGMA EXCEPTION_INIT(e_no_emp, -20020);
BEGIN
overload_pkg.del_emp(&no);
COMMIT;
EXCEPTION
WHEN e_no_emp THEN
DBMS_OUTPUT.put_line(SQLERRM);
ROLLBACK;
END;

SELECT * FROM EMP;

--根据员工的姓名删除员工的信息
DECLARE
e_no_emp EXCEPTION;
PRAGMA EXCEPTION_INIT(e_no_emp, -20020);
BEGIN
overload_pkg.del_emp('&name');
COMMIT;
EXCEPTION
WHEN e_no_emp THEN
DBMS_OUTPUT.put_line(SQLERRM);
ROLLBACK;
END;