Oracle 数据库学习-存储过程

6f11477b64

　　Oracle 数据库学习-存储过程
　　
　　SQL中循环和分支的写法

create or replace procedure basePro is
num number default 0;
begin
--loop循环
loop
Dbms_Output.put_line('loop...end loop' || num);
exit when(num > 2);
num := num + 1;
end loop;
--while loop循环
while (num < 6) loop
Dbms_Output.put_line('while...end loop' || num);
num := num + 1;
end loop;
--for loop循环
for i in 1 .. 4 loop
Dbms_Output.put_line('for...end loop' || i);
end loop;
num := 5;
if num < 10 then
Dbms_Output.put_line('if num < 10');
elsif num < 20 then
Dbms_Output.put_line('if num < 20');
else
Dbms_Output.put_line('if num < 30');
end if;
case
when num < 10 then
Dbms_Output.put_line('case num < 10');
when num < 20 then
Dbms_Output.put_line('case num < 10');
else
Dbms_Output.put_line('case num < 30');
end case;

--自己抛出异常  
raise_application_error(-20000,'bug bug');
insert into test values (1, '33');
commit;
exception

when others then
Dbms_Output.put_line('insert erroer'||sqlcode||sqlerrm);
end basePro;
/

　　
　　
　　

create or replace procedure bigNumInsert(arg1 in out default 0  number  , arg2 varchar2) is
newid number default 0;
begin
dbms_output.put_line(arg1);
dbms_output.put_line(arg2);
dbms_output.put_line(newid);
while (arg1 < 1000) loop
select nvl(max(id), 0) into newid from test;
newid := newid + 1;
insert into test values (newid, arg2 || arg1);
arg1 := arg1 + 1;
end loop;

update test t set t.name='4';
dbms_output.put_line(SQL%rowcount);
commit;
end;
/

　　
　　
　　

prompt
prompt Creating procedure CURSOR1
prompt ==========================
prompt
create or replace procedure cursor1 is
num number default 0;
cursor c1 is
select * from emp;
emprow emp%rowtype;
begin
--简单的游标
for i in (select * from emp) loop
dbms_output.put_line(i.EMPNO);
end loop;
--简单的游标2
for i in c1 loop
dbms_output.put_line(i.ENAME);
end loop;
--通常的用法
open c1;
loop
fetch c1
into emprow;
exit when c1%notfound;
dbms_output.put_line(emprow.empno || ' ' || emprow.ENAME);
end loop;
close c1;

--隐式游标
end cursor1;
/

　　
　　
　　
　　

create or replace procedure cursor2 is
--num number default 0;
--type ref_cursor is ref cursor;
c1     p1.ref_cursor;
emprow emp%rowtype;
sqlString varchar2(2000);
begin
--动态sql
sqlString := 'select * from emp t where t.empno=  7369';
open c1 for sqlString;
loop
fetch c1
into emprow;
exit when c1%notfound;
dbms_output.put_line(emprow.ename);
end loop;
close c1;
sqlString := 'select * from emp t where t.empno=  :empno';
open c1 for sqlString
using 7369;
loop
fetch c1
into emprow;
exit when c1%notfound;
dbms_output.put_line(emprow.ename);
end loop;
close c1;
end cursor2;
/