带有序列和触发器的 oracle 自动增量无法正常工作 [英] oracle autoincrement with sequence and trigger is not working correctly

问题描述

这是我的问题我有这段代码可以在oracle数据库中创建一个自动增量变量:

here is my problemI have this code to make an autoincrement variable in oracle database:

CREATE TABLE Korisnici
    (
        id_korisnika number PRIMARY KEY,
        ime_korisnika varchar2(200),
        prezime_korisnika varchar2(200),
        broj_telefona varchar2(30),
        adresa_korisnika varchar2(400)
    )
    /

create sequence test_seq
start with 1 
increment by 1;

CREATE OR REPLACE TRIGGER test_trigger
BEFORE INSERT ON Korisnici FOR EACH ROW
BEGIN
  SELECT test_seq.NEXTVAL
  INTO :NEW.id_korisnika
  FROM DUAL;
END;
/

如果我从头开始一切都很好，我的数字为 1,2,3,4....我关闭程序，再次打开，oracle 数据库连接再次启动.我再添加一个输入，我有像 20、21、22、23 这样的数字......我把程序放在我的 android 上并从不同的设备连接，当我输入一个用户时，我有 30,31,33,34...

If I start from begining everything works great, I have numbers as 1,2,3,4.... I close the program, open it again, so oracle database connection is once again started. I add one more input and I have numbers like 20,21,22,23... I put program on my android and connect from different device, when I input one user I have 30,31,33,34...

为什么会这样?以及如何修复它?

Why is this happening? And how to fix it?

谢谢

这是我从数据库读取数据的过程

Here is my proc for reading data from database

CREATE OR REPLACE PROCEDURE Citanje_korisnika( p_rc OUT SYS_REFCURSOR )
AS
BEGIN
  OPEN p_rc
   FOR SELECT *
         FROM Korisnici;
END;

我是 oracle 数据库的新手.

I am a bit of newbie in oracle database.

推荐答案

使用 NOCACHE 指定 SEQUENCE 将停止一次缓存 20 个数字的会话并提供帮助.

Specifying the SEQUENCE with NOCACHE will stop a session caching 20 numbers at a time and help.

create sequence test_seq
start with 1 
increment by 1
NOCACHE;

但是，如果您希望获得一个完全连续的序列，这很难实现 - 如果(例如)回滚插入，则从序列中获取的数字将丢失".

However, if you're hoping for a completely contiguous sequence this is very difficult to achieve - numbers taken from the sequence are "lost" if (for example) an insert is rolled back.

根据您的评论，我想知道您是否忘记了 COMMIT?

Based on your comment, I wonder if you're forgetting to COMMIT?

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