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--     ;CURSOR cursor_name IS select_statement

--For     
--(1)    
--(2)      
--(3)  for         
declare
       --    
       cursor c_job
       is
       select empno,ename,job,sal
       from emp
       where job='MANAGER';
       --        v_cinfo c_emp%ROWTYPE ,      c_emp        
       c_row c_job%rowtype;
begin
       for c_row in c_job loop
         dbms_output.put_line(c_row.empno||'-'||c_row.ename||'-'||c_row.job||'-'||c_row.sal);
       end loop;
end;


      
--Fetch  
--                

declare 
       --    
       cursor c_job
       is
       select empno,ename,job,sal
       from emp
       where job='MANAGER';
       --        
       c_row c_job%rowtype;
begin
       open c_job;
         loop
           --       c_row
           fetch c_job into c_row;
           --        ,       
           --   c_job%notfound  false 
           --    c_job%notfound  true
           exit when c_job%notfound;
            dbms_output.put_line(c_row.empno||'-'||c_row.ename||'-'||c_row.job||'-'||c_row.sal);
         end loop;
       --    
      close c_job;
end;

--1:      update  ,     sql   %found,%notfound,%rowcount,%isopen  update       。
       begin
         update emp set ENAME='ALEARK' WHERE EMPNO=7469;
         if sql%isopen then
           dbms_output.put_line('Openging');
           else
             dbms_output.put_line('closing');
             end if;
          if sql%found then
            dbms_output.put_line('        ');--           
            else
              dbms_output.put_line('Sorry');
              end if;
              if sql%notfound then
                dbms_output.put_line('Also Sorry');
                else
                  dbms_output.put_line('Haha');
                  end if;
                   dbms_output.put_line(sql%rowcount);
                   exception 
                     when no_data_found then
                       dbms_output.put_line('Sorry No data');
                       when too_many_rows then
                         dbms_output.put_line('Too Many rows');
                         end;
declare
       empNumber emp.EMPNO%TYPE;
       empName emp.ENAME%TYPE;
       begin
         if sql%isopen then
           dbms_output.put_line('Cursor is opinging');
           else
             dbms_output.put_line('Cursor is Close');
             end if;
             if sql%notfound then
               dbms_output.put_line('No Value');
               else
                 dbms_output.put_line(empNumber);
                 end if;
                 dbms_output.put_line(sql%rowcount);
                 dbms_output.put_line('-------------');
                 
                 select EMPNO,ENAME into  empNumber,empName from emp where EMPNO=7499;
                 dbms_output.put_line(sql%rowcount);
                 
                if sql%isopen then
                dbms_output.put_line('Cursor is opinging');
                else
                dbms_output.put_line('Cursor is Closing');
                end if;
                 if sql%notfound then
                 dbms_output.put_line('No Value');
                 else
                 dbms_output.put_line(empNumber);
                 end if;
                 exception 
                   when no_data_found then
                     dbms_output.put_line('No Value');
                     when too_many_rows then
                       dbms_output.put_line('too many rows');
                       end;
                   
                 
       
--2,     loop            
--    
declare 
       cursor csr_dept
       is
       --select  
       select DNAME
       from Depth;
       --     ,         csr_dept        
       row_dept csr_dept%rowtype;
begin
       --for  
       for row_dept in csr_dept loop
           dbms_output.put_line('    :'||row_dept.DNAME);
       end loop;
end;


--3,     while               ( %found  )
declare
       --    
       cursor csr_TestWhile
       is
       --select  
       select  LOC
       from Depth;
       --     
       row_loc csr_TestWhile%rowtype;
begin
  --    
       open csr_TestWhile;
       --       
       fetch csr_TestWhile into row_loc;
       --       ,     
         while csr_TestWhile%found loop
           dbms_output.put_line('    :'||row_loc.LOC);
           --       
           fetch csr_TestWhile into row_loc;
         end loop;
       close csr_TestWhile;
end; 
select * from emp



       
--4,           , for     ,                (      )
--CURSOR cursor_name[(parameter[,parameter],...)] IS select_statement;
--         :Parameter_name [IN] data_type[{:=|DEFAULT} value]  

declare 
      CURSOR 
      c_dept(p_deptNo number)
      is
      select * from emp where emp.depno=p_deptNo;
      r_emp emp%rowtype;
begin
        for r_emp in c_dept(20) loop
            dbms_output.put_line('   :'||r_emp.EMPNO||'   :'||r_emp.ENAME||'  :'||r_emp.SAL);
        end loop;
end;
select * from emp   
--5:         ,               (      )
declare 
       cursor
       c_job(p_job nvarchar2)
       is 
       select * from emp where JOB=p_job;
       r_job emp%rowtype;
begin 
       for r_job in c_job('CLERK') loop
           dbms_output.put_line('   '||r_job.EMPNO||' '||'    '||r_job.ENAME);
        end loop;
end;
SELECT * FROM EMP

--6:            :( if  ,     emp      emp1 , emp1       ),              
--http://zheng12tian.iteye.com/blog/815770 
        create table emp1 as select * from emp;
        
declare
        cursor
        csr_Update
        is
        select * from  emp1 for update OF SAL;
        empInfo csr_Update%rowtype;
        saleInfo  emp1.SAL%TYPE;
begin
    FOR empInfo IN csr_Update LOOP
      IF empInfo.SAL<1500 THEN
        saleInfo:=empInfo.SAL*1.2;
       elsif empInfo.SAL<2000 THEN
        saleInfo:=empInfo.SAL*1.5;
        elsif empInfo.SAL<3000 THEN
        saleInfo:=empInfo.SAL*2;
      END IF;
      UPDATE emp1 SET SAL=saleInfo WHERE CURRENT OF csr_Update;
     END LOOP;
END;

--7:    PL/SQL   ,    ‘A’ ‘S’               (sal) 10%     ( emp1       )
declare 
     cursor
      csr_AddSal
     is
      select * from emp1 where ENAME LIKE 'A%' OR ENAME LIKE 'S%' for update OF SAL;
      r_AddSal csr_AddSal%rowtype;
      saleInfo  emp1.SAL%TYPE;
begin
      for r_AddSal in csr_AddSal loop
          dbms_output.put_line(r_AddSal.ENAME||'     :'||r_AddSal.SAL);
          saleInfo:=r_AddSal.SAL*1.1;
          UPDATE emp1 SET SAL=saleInfo WHERE CURRENT OF csr_AddSal;
      end loop;
end;
--8:    PL/SQL   ,    salesman    (comm)500
declare
      cursor
          csr_AddComm(p_job nvarchar2)
      is
          select * from emp1 where   JOB=p_job FOR UPDATE OF COMM;
      r_AddComm  emp1%rowtype;
      commInfo emp1.comm%type;
begin
    for r_AddComm in csr_AddComm('SALESMAN') LOOP
        commInfo:=r_AddComm.COMM+500;
         UPDATE EMP1 SET COMM=commInfo where CURRENT OF csr_AddComm;
    END LOOP;
END;

--9:    PL/SQL   ,   2         MANAGER(      ,    )
--(  :                        ;                               。)
declare
    cursor crs_testComput
    is
    select * from emp1 order by HIREDATE asc;
    --   
    top_two number:=2;
    r_testComput crs_testComput%rowtype;
begin
    open crs_testComput;
       FETCH crs_testComput INTO r_testComput;
          while top_two>0 loop
             dbms_output.put_line('    :'||r_testComput.ENAME||'     :'||r_testComput.HIREDATE);
             --     
             top_two:=top_two-1;
             FETCH crs_testComput INTO r_testComput;
           end loop;
     close crs_testComput;
end;
    

--10:    PL/SQL   ,             (sal) 20%     ,
--         300     ( emp1       ,             ) 
declare
    cursor
        crs_UpadateSal
    is
        select * from emp1 for update of SAL;
        r_UpdateSal crs_UpadateSal%rowtype;
        salAdd emp1.sal%type;
        salInfo emp1.sal%type;
begin
        for r_UpdateSal in crs_UpadateSal loop
           salAdd:= r_UpdateSal.SAL*0.2;
           if salAdd>300 then
             salInfo:=r_UpdateSal.SAL;
              dbms_output.put_line(r_UpdateSal.ENAME||':      。'||'     :'||r_UpdateSal.SAL);
             else 
              salInfo:=r_UpdateSal.SAL+salAdd;
              dbms_output.put_line(r_UpdateSal.ENAME||':      .'||'    :'||salInfo);
           end if;
           update emp1 set SAL=salInfo where current of crs_UpadateSal;
        end loop;
end;
     
--11:                          
--  
  --CEIL(n)  :       n     
  --FLOOR(n)  :       n     
  --truc    http://publish.it168.com/2005/1028/20051028034101.shtml
declare
  cursor
   crs_WorkDay
   is
   select ENAME,HIREDATE, trunc(months_between(sysdate, hiredate) / 12) AS SPANDYEARS,
       trunc(mod(months_between(sysdate, hiredate), 12)) AS months,
       trunc(mod(mod(sysdate - hiredate, 365), 12)) as days
   from emp1;
  r_WorkDay crs_WorkDay%rowtype;
begin
    for   r_WorkDay in crs_WorkDay loop
    dbms_output.put_line(r_WorkDay.ENAME||'     '||r_WorkDay.SPANDYEARS||' , '||r_WorkDay.months||' , '||r_WorkDay.days||' ');
    end loop;
end;
  
--12:      ,          ( CASE  ,    emp1 ,  emp1    ),             
--  deptno  raise(%)
--  10      5%
--  20      10%
--  30      15%
--  40      20%
--          sal   
--CASE expr WHEN comparison_expr THEN return_expr
--[, WHEN comparison_expr THEN return_expr]... [ELSE else_expr] END
declare
     cursor
         crs_caseTest
          is
          select * from emp1 for update of SAL;
          r_caseTest crs_caseTest%rowtype;
          salInfo emp1.sal%type;
     begin
         for r_caseTest in crs_caseTest loop
         case 
           when r_caseTest.DEPNO=10
           THEN salInfo:=r_caseTest.SAL*1.05;
           when r_caseTest.DEPNO=20
           THEN salInfo:=r_caseTest.SAL*1.1;
           when r_caseTest.DEPNO=30
           THEN salInfo:=r_caseTest.SAL*1.15;
            when r_caseTest.DEPNO=40
           THEN salInfo:=r_caseTest.SAL*1.2;
         end case;
          update emp1 set SAL=salInfo where current of crs_caseTest;
        end loop;
end;

--13:            ,                   ,      50 ,         ,    ,      。
--AVG([distinct|all] expr) over (analytic_clause)
---  :
--  analytic_clause          。
  --      :
  --FUNCTION_NAME(<argument>,<argument>...)
  --OVER
  --(<Partition-Clause><Order-by-Clause><Windowing Clause>)
     --PARTITION  
     --       (    ),         ,                 
     select * from emp1
DECLARE
     CURSOR 
     crs_testAvg
     IS
     select EMPNO,ENAME,JOB,SAL,DEPNO,AVG(SAL) OVER (PARTITION BY DEPNO ) AS DEP_AVG
     FROM EMP1 for update of SAL;
     r_testAvg crs_testAvg%rowtype;
     salInfo emp1.sal%type;
     begin
     for r_testAvg in crs_testAvg loop
     if r_testAvg.SAL>r_testAvg.DEP_AVG then
     salInfo:=r_testAvg.SAL-50;
     end if;
     update emp1 set SAL=salInfo where current of crs_testAvg;
     end loop;
end;