oracle学习_创建函数调用函数及存储过程

**

–创建方法并调用方法

**

create or replace function f_get_name(t_empno in varchar2)
return varchar2 is
v_emp_name emp.ename%type;
begin
select e.ename into v_emp_name
from emp e where e.empno=t_empno;
return v_emp_name;
end f_get_name;
select f_get_name('7698') from dual
--根据部门号查询部门名称，使用函数 查询人员姓名及部门名称
create or replace function f_get_name_by_deptno(t_deptno in varchar2)
return varchar2 is
v_dept_name dept.dname%type;
begin
select d.dname into v_dept_name
from dept d where d.deptno=v_dept_name;
return v_dept_name;
end f_get_name_by_deptno;

select ename,f_get_name_by_deptno(deptno) from emp
select * from emp

**

–存储过程 执行DML语句用commit

**

--create or replace procedure 
--存储过程的调用
--exec 过程名() 
create or replace procedure proc_demo(
dept_no number default 10,sal_sum out number,emp_count out number)
is
begin
select sum(sal),count(*) into sal_sum,emp_count
from emp where deptno=dept_no;
end proc_demo;

**

–用存储过程实现decode函数的功能 --输出参数是修改的记录数

**

create or replace procedure proc_demo2(up_count out number) is
begin
up_count := 0;
declare
cursor e_job is
select empno, job from emp;
begin
    for v_job in e_job loop
      if v_job.job = 'CLERK' then
        update emp set job = '办事员' where empno = v_job.empno;
      elsif v_job.job = 'SALESMAN' then
        update emp set job = '销售人员' where empno = v_job.empno;
      elsif v_job.job = 'MANAGER' then
        update emp set job = '经理' where empno = v_job.empno;
      else
        update emp set job = '其他' where empno = v_job.empno;
      end if;
      up_count := up_count + 1;
    end loop;
    commit;
  end;
end proc_demo2;

select * from emp

–过程名

create table manager as select * from emp
select * from manager

--向manager表中插入职位为经理年薪大于7W的数据
--如果MANAGER表里已经存在此员工，则不插入
--如果不存在，在插入。输出参数是插入的记录数
create or replace procedure proc_demo3(
       up_no out number)
is 
begin
up_no:=0;
declare
cursor c_year_sal is
select empno, nvl(e.sal,0)*12+nvl(e.comm,0) as yearsal from emp;
begin 
if c_year_sal.yearsal>70000 then
insert into manager select * from emp where empno = c_year_sal.empno;
else
        exit;
     end if;
     commit;
     end;
     end proc_demo3;


create or replace procedure proc_demo(
       dept_no number default 10,
       sal_sum out number,
       emp_count out number)
is
begin
  select sum(sal),count(*) into sal_sum,emp_count
  from emp where deptno=dept_no;
  end proc_demo;

**

–无游标

**

        CREATE OR REPLACE PROCEDURE add_Man2(m_num OUT NUMBER) IS
          u_row_num number;
        
        BEGIN
          m_num := 0;
          SELECT COUNT(1)
            INTO u_row_num
            FROM manager
           WHERE job = '经理'
             AND (nvl(sal, 0) * 12 + nvl(comm, 0)) > 70000;
          IF (u_row_num < 1) THEN
            --不存在
            INSERT INTO manager
              (empno, ename, job, sal, comm)
            VALUES
              (8654, '小陈', '经理', 6000, 500);
            commit;
            m_num := m_num + 1;
          END IF;
        END;
select * from manager;