我的目的是创建一个包含2个主键的表,其中一个是自动增量,另一个是在插入时指定的,当我为该表创建一个新字段时,如果未增加的主键发生更改,则必须启动重新计数。这就是我所拥有的:
我已经能够将表引擎更改为MyISAM。但是缺少一些东西,auto_increment
并没有像以前那样从100开始。
CREATE TABLE CONFIGURABLES(
CODIEI2 INTEGER AUTO_INCREMENT,
CODIEI1 INTEGER,
SKU VARCHAR(30),
COLOR INTEGER,
COLOR2 INTEGER,
TALLA INTEGER,
CONSTRAINT PK_CODIEI PRIMARY KEY(CODIEI1,CODIEI2),
CONSTRAINT FK_CODIEI1 FOREIGN KEY(CODIEI1) REFERENCES PRODUCTOS(ENTITY_ID) ON DELETE CASCADE,
CONSTRAINT FK_CCOLOR FOREIGN KEY(COLOR) REFERENCES COLORES(CODICOL) ON DELETE CASCADE,
CONSTRAINT FK_CCOLOR2 FOREIGN KEY(COLOR2) REFERENCES COLORES(CODICOL) ON DELETE CASCADE,
CONSTRAINT FK_CTALLA FOREIGN KEY(TALLA) REFERENCES TALLAS(CODITLL) ON DELETE CASCADE) ENGINE=MyISAM;
ALTER TABLE CONFIGURABLES AUTO_INCREMENT = 100;
是否发生这种情况,因为当auto_increment
值与默认数字不同时,引擎必须设置为InnoDB?
有没有办法按我的意愿得到它?
SOLUTION:
该表可以返回到InnoDB,它更好,并且auto_increment
表上不需要CONFIGURABLES
,因为在执行插入时这将被控制。
CREATE TABLE CONFIGURABLES(
CODIEI2 INTEGER,
CODIEI1 INTEGER,
SKU VARCHAR(30),
COLOR INTEGER,
COLOR2 INTEGER,
TALLA INTEGER,
CONSTRAINT PK_CODIEI PRIMARY KEY(CODIEI1,CODIEI2),
CONSTRAINT FK_CODIEI1 FOREIGN KEY(CODIEI1) REFERENCES PRODUCTOS(ENTITY_ID) ON DELETE CASCADE,
CONSTRAINT FK_CCOLOR FOREIGN KEY(COLOR) REFERENCES COLORES(CODICOL) ON DELETE CASCADE,
CONSTRAINT FK_CCOLOR2 FOREIGN KEY(COLOR2) REFERENCES COLORES(CODICOL) ON DELETE CASCADE,
CONSTRAINT FK_CTALLA FOREIGN KEY(TALLA) REFERENCES TALLAS(CODITLL) ON DELETE CASCADE);
在插入时执行此操作:
BEGIN;
SELECT @id := IFNULL(MAX(CODIEI2)+1,100) FROM CONFIGURABLES WHERE CODIEI1 = 10001 FOR UPDATE;
INSERT INTO CONFIGURABLES
(CODIEI1,CODIEI2,SKU,COLOR,COLOR2,TALLA)
VALUES
(10001,@id,'',4,2,2);
COMMIT;
答案 0 :(得分:1)
BEGIN;
SELECT @id := MAX(id)+1 FROM foo WHERE other = 123 FOR UPDATE;
INSERT INTO foo
(other, id, ...)
VALUES
(123, @id, ...);
COMMIT;
答案 1 :(得分:0)
如何插入数据?如果您将CODIEI2作为列和值给出,则会覆盖auto_increment。
在SQLFiddle中测试:
构建架构:
CREATE TABLE CONFIGURABLES(
CODIEI2 INTEGER AUTO_INCREMENT,
CODIEI1 INTEGER,
CONSTRAINT PK_CODIEI PRIMARY KEY(CODIEI2));
ALTER TABLE CONFIGURABLES AUTO_INCREMENT = 100;
INSERT INTO CONFIGURABLES ( CODIEI1 )
VALUES ( 1 );
现在覆盖auto_increment:
INSERT INTO CONFIGURABLES ( CODIEI2, CODIEI1 )
VALUES ( 1, 2 );
运行SQL:
SELECT *
FROM CONFIGURABLES;
输出:
CODIEI2 CODIEI1
1 2
100 1