存储过程和存储函数和触发器示例

1、存储过程示例：为指定的职工在原工资的基础上长10%的工资

SQL> create or replace procedure raiseSalary(empid in number)
 
    as
 
    pSal emp.sal%type;
 
    begin
 
    select sal into pSal from emp where empno=empid;
 
    update emp set sal = sal*1.1 where empno=empid;
 
    dbms_output.put_line('员工号:' || empid || '涨工资前
 
    ' || psal || '涨工资后' || psal*1.1);
 
    end;
 
   /
 
Procedure created
 
SQL> set serveroutput on
 
SQL> exec raisesalary(7369);

员工号:7369涨工资前

 

800涨工资后880

 

PL/SQL procedure successfully completed

 

2、存储函数示例：查询某职工的年收入。

SQL> /**   查询某职工的总收入 　　*/

create or replace function queryEmpSalary(empid in number)
 
    return number
 
    as
 
    pSal number; --定义变量保存员工的工资
 
    pComm number; --定义变量保存员工的奖金
 
   begin
 
   select sal,comm into psal,pcomm from emp where empno = empid;
 
   return psal*12+nvl(pcomm,0);
 
   end;
 
   /
 
Function created
 
SQL> declare
 
    v_sal number;
 
    begin
 
    v_sal:=queryEmpSalary(7934);
 
    dbms_output.put_line('salary is:'|| v_sal);
 
    end;
 
    /
 
salary is:15600
 
PL/SQL procedure successfully completed
 
SQL> begin
 
    dbms_output.put_line('salary is:'|| queryEmpSalary(7934));
 
    end;
 
    /
 
salary is:15600
 
PL/SQL procedure successfully completed

 

3、创建触发器示例1：限制非工作时间向数据库插入数据

SQL> create or replace
 
    trigger securityEmp
 
    before insert on emp
 
    declare
 
    begin
 
    if to_char(sysdate,'day')in('星期四','星期六','星期日')
 
    or to_number(to_char(sysdate,'hh24'))not between 8 and 18 then 
 
    raise_application_error(-20001,'不能在非工作时间插入数据。');
 
    end if;
 
   end;
 
   /
 
Trigger created

 

4、创建触发器示例2：确认数据（检查emp表中sal 的修改值不低于原值）

SQL> create or replace trigger checkSal
 
    before update of sal on emp
 
    for each row
 
    declare
 
    begin
 
    if :new.sal<:old.sal then
 
    raise_application_error(-20001,'更新后的薪水比更新前小');
 
    end if;
 
    end;
 
   /
 
Trigger created