#3780 - Referencing column 'DomainId' and referenced column 'Id' in foreign key constraint 'FK_SiteLoginAppointedStaff_Domain_DomainId' are incompatible.

该问题是由于字段类型不兼容引起的，如果在使用中升级过 MySQL 数据库的版本，就有可能会在执行表结构升级脚本时遇到该问题。一般是因为高版本的 MySQL 放弃了对之前旧版本字符集的支持引起的。

解决方法

查看之前旧表中对应字段的字符集，在此例中，我们查看 Domain 表中 Id 的字符集。

如图，原有表中 Id 使用的字符集排序规则是 utf8mb3_general_ci。
注意：客服系统数据库本身并没有指定字符集，使用的字符集取决于创建数据库时，其本身的默认字符集。

修改升级数据库脚本，在创建表的脚本后面增加指定字符集排序规则的内容：

ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8mb3 COLLATE = utf8mb3_general_ci ROW_FORMAT = Compact;

例如原 SQL 脚本

CREATE TABLE `SiteLoginAppointedStaff` (
    `Id` char(36) NOT NULL,
    `DomainId` char(36) NOT NULL,
    `SiteId` char(36) NOT NULL,
    `StaffId` char(36) NOT NULL,
    CONSTRAINT `PK_SiteLoginAppointedStaff` PRIMARY KEY (`Id`),
    CONSTRAINT `FK_SiteLoginAppointedStaff_Domain_DomainId` FOREIGN KEY (`DomainId`) REFERENCES `Domain` (`Id`) ON DELETE RESTRICT,
    CONSTRAINT `FK_SiteLoginAppointedStaff_Site_SiteId` FOREIGN KEY (`SiteId`) REFERENCES `Site` (`Id`) ON DELETE CASCADE,
    CONSTRAINT `FK_SiteLoginAppointedStaff_Staff_StaffId` FOREIGN KEY (`StaffId`) REFERENCES `Staff` (`Id`) ON DELETE CASCADE
);

修改为

CREATE TABLE `SiteLoginAppointedStaff` (
    `Id` char(36) NOT NULL,
    `DomainId` char(36) NOT NULL,
    `SiteId` char(36) NOT NULL,
    `StaffId` char(36) NOT NULL,
    CONSTRAINT `PK_SiteLoginAppointedStaff` PRIMARY KEY (`Id`),
    CONSTRAINT `FK_SiteLoginAppointedStaff_Domain_DomainId` FOREIGN KEY (`DomainId`) REFERENCES `Domain` (`Id`) ON DELETE RESTRICT,
    CONSTRAINT `FK_SiteLoginAppointedStaff_Site_SiteId` FOREIGN KEY (`SiteId`) REFERENCES `Site` (`Id`) ON DELETE CASCADE,
    CONSTRAINT `FK_SiteLoginAppointedStaff_Staff_StaffId` FOREIGN KEY (`StaffId`) REFERENCES `Staff` (`Id`) ON DELETE CASCADE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8mb3 COLLATE = utf8mb3_general_ci ROW_FORMAT = Compact;

再次执行脚本即可完成升级。