EF 数据迁移常见错误汇总

1.An operation was scaffolded that may result in the loss of data. Please review the migration for accuracy.

上次执行还是可以的这次迁移就提示，常见的解决方案如下：

（1）提交上次更改到数据库后，再进行本次操作，再提交数据库

（2）还原实体，确保数据库和实体保持一致。再去修改实体和进行本次操作，再提交数据库

（3）删除上次的迁移记录重新迁移。

实体变更后都要提交数据库确保数据库和实体一致

2.迁移更新提示

EF 数据迁移常见错误汇总

手工创建了迁移记录表解决：

mysql脚本：

CREATE TABLE `__efmigrationshistory` (
`MigrationId` varchar(95) NOT NULL,
`ProductVersion` varchar(32) NOT NULL,
PRIMARY KEY (`MigrationId`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

sqlserver：

CREATE TABLE [dbo].[__EFMigrationsHistory](
   [MigrationId] [nvarchar](150) NOT NULL,
   [ProductVersion] [nvarchar](32) NOT NULL,
CONSTRAINT [PK___EFMigrationsHistory] PRIMARY KEY CLUSTERED
(
   [MigrationId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

EF 数据迁移常见错误汇总

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