php - MySQL 大 FK 标识符

Question

我正在尝试创建一个 fk 但 MySQL 不允许...

Identifier name 'foobarbaz_FK_CATALOG_PRODUCT_ENTITY_WEEE_DISCOUNT_PRODUCT_ENTITY' is too long [ CREATE TABLE `foobarbaz_weee_discount` (   `entity_id` int(10) unsigned NOT NULL DEFAULT '0',   `website_id` smallint(5) unsigned NOT NULL DEFAULT '0',   `customer_group_id` smallint(5) unsigned NOT NULL,   `value` decimal(12,4) NOT NULL DEFAULT '0.0000',   KEY `foobarbaz_FK_CATALOG_PRODUCT_ENTITY_WEEE_DISCOUNT_WEBSITE` (`website_id`),   KEY `foobarbaz_FK_CATALOG_PRODUCT_ENTITY_WEEE_DISCOUNT_PRODUCT_ENTITY` (`entity_id`),   KEY `foobarbaz_FK_CATALOG_PRODUCT_ENTITY_WEEE_DISCOUNT_GROUP` (`customer_group_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; ]

有没有办法添加大fks？ 谢谢。

Answer 1

不，它被硬编码到 MySQL 中，参见 the docs (朝向页面底部)。但这与FK的名称无关。是索引的名称太长(最多 64 个字符):

`Identifier`                  `Maximum Length (characters)`
Database                      64
Table                         64
Column                        64
Index                         64
Constraint                    64
Stored Procedure or Function  64
Trigger                       64
View                          64
Alias                         256 (see exception following table)
Compound Statement Label      16