如何设置auto_increment列,使其每次插入记录时递增10。
例如:代替默认的<code>auto_increment</code>by 1,
insert into temptable (name) values( abc ),( def );
select * from temptable;
id|name
1|abc
2|def
auto_increment by 10,
id|name
10|abc
20|def
如何设置auto_increment列,使其每次插入记录时递增10。
例如:代替默认的<code>auto_increment</code>by 1,
insert into temptable (name) values( abc ),( def );
select * from temptable;
id|name
1|abc
2|def
auto_increment by 10,
id|name
10|abc
20|def
您必须更改auto_increment_increment
设置,但是这将同时应用于所有表。我不认为存在每个表的增量设置。
不过,这样做通常不是一个好主意。您是想生成发票号码还是其他什么?在这种情况下,您最好使用生成下一个数字的自定义方法。
我不知道你为什么需要这个,但如果你想在输出中得到这个结果,你可以简单地将值乘以10
您可以关闭auto_increment,然后添加一个触发器。设置另一个具有单个值的表,即下一个id,然后将插入行的id设置为该表的值:
CREATE TABLE next (next_id int not null);
INSERT INTO next VALUES(0);
delimiter |
CREATE TRIGGER update_id BEFORE INSERT ON temptable
FOR EACH ROW BEGIN
SET NEW.id = (SELECT next_id FROM next);
UPDATE next SET next_id = next_id + 10;
END;
|
delimiter ;
如果你已经有了你的id,并且想把它们放大10乘10,那么按照Nazariy的想法,使用当前的id,并用
更新xyourtablex集合id=id*10000
or a bigger number than your ids (if not, you will create duplicates) and finally:
更新xyourtablex集合id=id/1000
或者简单地删除unique或index,乘以10,再加上index或unique:)
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