Description: This article is a guidebook for beginners in PL/SQL development.
Tags: PL/SQL, pipe, pipe, loop, optimization, acceleration, dbms_pipe
Interpretation: DBMS_PIPE pipe package is a function introduced by Oracle11gR1, used in the same routine (example ) To communicate between different sessions.
Advantages: Because the pipe pipeline in PL/SQL has high-performance characteristics, it is often used for data transmission in the loop body. It is
easy to learn: the unnecessary parts are deleted in the text, so that beginners can learn it at a glance Will
Reminder: If you find a problem or a better way to write this article, please leave a message or private message me to modify and optimize
-Create a stored procedure with a pipeline
create or replace procedure p_select
is
i simple_integer := 1;
j simple_integer := 2000000000;
v simple_integer := 0;
message char(10);
pipename char(20) := 'pipe_zzt_select';
begin
for i in 1 .. j loop
select /*+ no_result_cache */
count(*) into v
from zzt.info a, zzt.info b
where a.sal != b.sal
and a.id < 100
and a.sal < 50000;
if dbms_pipe.receive_message(pipename, 0) = 0 then
dbms_pipe.unpack_message(message);
exit when message = 'stop';
end if;
end loop;
v := dbms_pipe.remove_pipe(pipename);
end;
/--Send stop information to the loop body (pipe_zzt_select)
set timing on
declare
pipename char(20) :='pipe_zzt_select';
message char(10) :='stop';
flag pls_integer;
begin
flag := dbms_pipe.create_pipe(pipename);
if flag = 0 then
dbms_pipe.pack_message(message);
flag := dbms_pipe.send_message(pipename);
end if;
end ;
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over