在ORACLE存储过程中创建临时表
存储过程里不能直接使用DDL语句,所以只能使用动态SQL语句来执行
--ON COMMIT DELETE ROWS 说明临时表是事务指定,每次提交后ORACLE将截断表(删除全部行)
--ON COMMIT PRESERVE ROWS 说明临时表是会话指定,当中断会话时ORACLE将截断表。
CREATE OR REPLACE PROCEDURE temptest
(p_searchDate IN DATE)
IS
v_count INT;
str varchar2(300);
BEGIN
v_count := 0;
str:='drop table SETT_DAILYTEST';
execute immediate str;
str:='CREATE GLOBAL TEMPORARY TABLE SETT_DAILYTEST (
NACCOUNTID NUMBER not null,
NSUBACCOUNTID NUMBER not null)
ON COMMIT PRESERVE ROWS';
execute immediate str; ----使用动态SQL语句来执行
str:='insert into SETT_DAILYTEST (select naccountid,nsubaccountid from sett_dailyaccountbalance)';
execute immediate str;
END temptest;
上面建立一个临时表的存储过程
下面是执行一些操作,向临时表写数据。
CREATE OR REPLACE PROCEDURE PR_DAILYCHECK
(
p_Date IN DATE,
p_Office IN INTEGER,
p_Currency IN INTEGER,
P_Check IN INTEGER,
p_countNum OUT INTEGER)
IS
v_count INT;
BEGIN
v_count := 0;
IF p_Date IS NULL THEN
dbms_output.put_line('日期不能为空');
ELSE
IF P_Check = 1 THEN
insert into SETT_DAILYTEST (select naccountid,nsubaccountid from sett_dailyaccountbalance
where dtdate = p_Date);
select
count(sd.naccountid) into v_count
from sett_subaccount ss,sett_account sa,sett_dailytest sd
where sd.naccountid = sa.id and sd.nsubaccountid = ss.id and sa.id = ss.naccountid
AND sa.nofficeid = p_Office AND sa.ncurrencyid = p_Currency
and rownum < 2;
COMMIT;
p_countNum := v_count;
dbms_output.put_line(p_countNum);
END IF;
IF P_Check = 2 THEN
insert into SETT_DAILYTEST (select naccountid,nsubaccountid from sett_dailyaccountbalance
where dtdate = p_Date);
select
count(sd.naccountid) into v_count
from sett_cfsubaccount ss,sett_account sa,sett_dailytest sd
where sd.naccountid = sa.id and sd.nsubaccountid = ss.id and sa.id = ss.naccountid
AND sa.nofficeid = p_Office AND sa.ncurrencyid = p_Currency
and rownum < 2;
COMMIT;
p_countNum := v_count;
dbms_output.put_line(p_countNum);
END IF;
END IF;
END PR_DAILYCHECK;
需要创建一个临时表,请举例说明,谢谢!
---------------------------------------------------------------
是TEMPORARY
CREATE GLOBAL TEMPORARY TABLE flight_schedule (
startdate DATE,
enddate DATE,
cost NUMBER)
---------------------------------------------------------------
create proecdure name_pro
as
str varchar2(100);
begin
str:='CREATE GLOBAL TEMPORARY TABLE TABLENAME ON
COMMIT PRESERVE ROWS as select * from
others_table';
execute immediate str;
end;
/
可以把临时表指定为事务相关(默认)或者是会话相关:
ON COMMIT DELETE ROWS:指定临时表是事务相关的,Oracle在每次提交后截断表。
ON COMMIT PRESERVE ROWS:指定临时表是会话相关的,Oracle在会话中止后截断表。
=================
可以创建以下两种临时表:
1。会话特有的临时表
CREATE GLOBAL TEMPORARY <TABLE_NAME> (<column specification>)
ON COMMIT PRESERVE ROWS;
========
对全局临时表的总结
在临时表上的操作比在一般的表上的操作要快。因为:
1创建临时表不需要往编目表中插入条目,临时表的使用也不需要访问编目表,因此也没有对编目表的争用。
2仅有创建临时表的app才可存取临时表,所以在处理临时表时没有锁。
3如果指定NOT LOGGED选项,在处理临时表时不记日志。所以如果有仅在数据库的一个会话中使用的大量临时数据,把这些数据存入临时表能大大提高性能。
DECLARE GLOBAL TEMPORARY TABLE TT(C1 INT, C2 CHAR(20));
在CONNECT RESET命令后,临时表不再存在。
建临时表是动态编译的,所以对临时表的使用也必须放在DECLARE CURSER 后面
CREATE PROCEDURE INSTT2(P1 INT, P2 CHAR(20))
BEGIN
DECLARE GLOBAL TEMPORARY TABLE TT(C1 INT, C2 CHAR(20)) %
INSERT INTO SESSION.TT VALUES(P1, P2);
BEGIN
DECLARE C1 CURSOR WITH RETURN FOR SELECT * FROM SESSION.TT;
END;
END %
2。事务特有的临时表
CREATE GLOBAL TEMPORARY <TABLE_NAME> (<column specification>)
ON COMMIT DELETE ROWS;
在Oracle中,全局临时表并不会删除,实际上你只需要建立一次,以后直接应用就行了,这与MS和Sybase不一样。实际上在断开数据库连接时,临时
表中数据自动清空,不同的Session之间是隔离的,不许要当心相互影响,不过如果起用了连接共享的话,你要用On Commit
delete rows使数据仅在事物内部有效。
3建立临时表
临时表的定义对所有会话SESSION都是可见的,但是表中的数据只对当前的会话或者事务有效.
建立方法:
1) ON COMMIT DELETE ROWS 定义了建立事务级临时表的方法.
CREATE GLOBAL TEMPORARY TABLE admin_work_area
(startdate DATE,
enddate DATE,
class CHAR(20))
ON COMMIT DELETE ROWS;
EXAMPLE:
SQL> CREATE GLOBAL TEMPORARY TABLE admin_work_area
2 (startdate DATE,
3 enddate DATE,
4 class CHAR(20))
5 ON COMMIT DELETE ROWS;
SQL> create table permernate( a number);
SQL> insert into admin_work_area values(sysdate,sysdate,'temperary table');
SQL> insert into permernate values(1);
SQL> commit;
SQL> select * from admin_work_area;
SQL> select * from permernate;
A
1
2)ON COMMIT PRESERVE ROWS 定义了创建会话级临时表的方法.
CREATE GLOBAL TEMPORARY TABLE admin_work_area
(startdate DATE,
enddate DATE,
class CHAR(20))
ON COMMIT PRESERVE ROWS;
EXAMPLE:
会话1:
SQL> drop table admin_work_area;
SQL> CREATE GLOBAL TEMPORARY TABLE admin_work_area
2 (startdate DATE,
3 enddate DATE,
4 class CHAR(20))
5 ON COMMIT PRESERVE ROWS;
SQL> insert into permernate values(2);
SQL> insert into admin_work_area values(sysdate,sysdate,'session temperary');
SQL> commit;
SQL> select * from permernate;
A
----------
1
2
SQL> select * from admin_work_area;
STARTDATE ENDDATE CLASS
---------- ---------- --------------------
17-1ÔÂ -03 17-1ÔÂ -03 session temperary
会话2:
SQL> select * from permernate;
A
----------
1
2
SQL> select * from admin_work_area;
未选择行.
会话2看不见会话1中临时表的数据.
posted on 2009-02-26 17:29
SIMONE 阅读(8611)
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