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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;
--- ， :http://www.cnblogs.com/sc-xx/archive/2011/12/03/2275084.html