plsql_3

   
获取环境与会话
     
  select SYS_CONTEXT('USERENV','SESSION_USER'),SYS-CONTEXT('USERENV',IP_ADDRESS) INTO USERNAME,IP_ADDRESS
FROM DUAL


更新查询返回的结果行
  
  update  employess SET ROW = emp_row

where ....


加  一个returning 返回结果


delcare
 
  first employees.first_name%type;
last employees.last_name %type;

new_salary employees.salary%type;

  begin
    update employees
   
     set salary = salary+(salary*0.3)
     where employee_id =100;
returning fisrt_name,last_name,salary into fist,last,new_sarlary;

dbms_ouput_put.line


  更新游标返回的行结果

     使用where current of 更新循环当前数据
  

   delcar 


   cursor  emp_sal+cur is
    select * from employess
    where department_id =60
for update;
  emp_sal_rec emp_sal_cur%rowtype;

  begin

  for emp_sal_rec in emp_sal_cur loop

  dbms_output_put.line

  update employees
 
   set salary = salary+(salary*.025)
   where current of emp_sal_cur;
  end loop;

  for emp_sal_rec in emp_sal_cur loop

  dbms

end loop;
end;


删除 返回的结果行

    create or replace procedure remove_job_history(dept_id in number) as
  cursor job history_cur_is

  select * from job_hisory  ......for update

    rec job_histroy_cur_is

begin

  for rec in job_....... loop
   delete from ....
where current of job_cur...



删除重复数据


delete from employees a where rowind>(
 
select min(rowid) from employees b where a.employee_id  = b.employees_id);

)