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在生产环境中，常有一些生产流水表是用生产流水的id号作为主键，如何让主键进行自我递增呢?

可以结合sequence和procedure来达到这个目的：

首先建立一张流水表如下：

SQL> desc cost_log

Name Type Nullable Default Comments

---------- ------------ -------- ------- --------

CID NUMBER

USERID NUMBER

DATETIME DATE Y

RUNNO VARCHAR2(10) Y

CARDNO VARCHAR2(10)

MONEY NUMBER Y

SERVERNAME VARCHAR2(10) Y

在建立一个sequence：

CREATE SEQUENCE "SCOTT"."COST_SEQ" MINVALUE 1 MAXVALUE 10000 INCREMENT BY 1 START WITH 2 CACHE 20 NOORDER CYCLE ;

在建立procedure：

SQL> create or replace procedure add_cost_log(

2 p_userid in number,

3 p_runno in varchar2,

4 p_cardno in varchar2,

5 p_money in number,

6 p_servername in varchar2)

7 as

8 begin

9 insert into cost_log(

10 cid,

11 userid,

12 runno,

13 cardno,

14 money,

15 servername)

16 values

17 (cost_seq.nextval,

18 p_userid,

19 p_runno,

20 p_cardno,

21 p_money,

22 p_servername);

23 commit;

24 end add_cost_log;

25 /

Procedure created

最后调用存储过程，进行测试。

SQL> declare

2 i_userid cost_log.userid%type :=101;

3 i_runno cost_log.runno%type :='101';

4 i_cardno cost_log.cardno%type :='101';

5 i_money cost_log.money%type :=101;

6 i_name cost_log.servername%type :='hello';

7 begin

8 add_cost_log(i_userid,i_runno,i_cardno,i_money,i_name);

9 end;

10 /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> /

PL/SQL procedure successfully completed

SQL> select * from cost_log;

CID USERID DATETIME RUNNO CARDNO MONEY SERVERNAME

---------- ---------- ----------- ---------- ---------- ---------- ----------

2 101 101 101 101 hello

3 101 101 101 101 hello

4 101 101 101 101 hello

如此，就可以简单的使用了。
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