[英]Entity Framework Automatic migrations that affect the location of the migrations history
我的自动迁移在尝试更新数据库时一直给我这个错误。
不支持影响迁移历史记录系统表位置的自动迁移(例如默认架构更改)。 请对基于代码的迁移使用影响迁移历史记录系统表位置的操作。
这是我的代码:
[DbConfigurationType(typeof(AlvinCMSExtension.Migration.AlvinCMSCustomHistoryConfiguration))]
public class AccountDBContext : DbContext
{
public AccountDBContext()
: base("DefaultConnection")
{
Database.SetInitializer(new MigrateDatabaseToLatestVersion<Alvin_CMS.Models.AccountDBContext, Alvin_CMS.Migrations.AccountDBContext.Configuration>());
}
public DbSet<UserProfile> UserProfiles { get; set; }
public DbSet<Membership> Memberships { get; set; }
public DbSet<Role> Roles { get; set; }
public DbSet<UsersInRole> UsersInRoles { get; set; }
public DbSet<OAuthMembership> OAuthMemberships { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString());
string query = "select schema_name()";
if (con.State == ConnectionState.Closed)
con.Open();
SqlCommand com = new SqlCommand(query, con);
var x = com.ExecuteScalar();
if (con.State == ConnectionState.Open)
con.Close();
modelBuilder.HasDefaultSchema(x.ToString());
}
}
internal sealed class Configuration : DbMigrationsConfiguration<Alvin_CMS.Models.AccountDBContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = true;
MigrationsDirectory = @"Migrations\AccountDBContext";
//SetHistoryContextFactory("System.Data.SqlClient", (conn, schema) => new AccountHistoryContext(conn, schema));
}
protected override void Seed(Alvin_CMS.Models.AccountDBContext context)
{
// This method will be called after migrating to the latest version.
// You can use the DbSet<T>.AddOrUpdate() helper extension method
// to avoid creating duplicate seed data. E.g.
//
// context.People.AddOrUpdate(
// p => p.FullName,
// new Person { FullName = "Andrew Peters" },
// new Person { FullName = "Brice Lambson" },
// new Person { FullName = "Rowan Miller" }
// );
//
}
}
public class CustomHistoryContext : HistoryContext
{
public CustomHistoryContext(DbConnection dbConnection, string defaultSchema)
: base(dbConnection, defaultSchema)
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.HasDefaultSchema("dbo");
modelBuilder.Entity<HistoryRow>().ToTable(tableName: "__MigrationHistory", schemaName: "dbo");
//modelBuilder.Entity<HistoryRow>().ToTable(tableName: "__MigrationHistory", schemaName: "dbo");
}
}
public class AlvinCMSCustomHistoryConfiguration : DbConfiguration
{
public AlvinCMSCustomHistoryConfiguration()
{
this.SetHistoryContext("System.Data.SqlClient",
(connection, defaultSchema) => new CustomHistoryContext(connection, "dbo"));
}
}
我可以在没有其他数据库上下文任何问题的情况下进行迁移,但只有使用此AccountDBContext时才会出现错误。 这个错误的原因是什么?
该错误是因为您已定义自定义架构名称。 如果要使用自定义架构名称,则无法使用自动迁移。 如果你想使用自动迁移删除调用HasDefaultSchema
内OnModelCreating
。
以下是启用Code First迁移的方法。
首先在程序包管理器控制台上执行Add-Migration命令,然后在Update-Database中执行
例如:
add-migration <migration name>
update-database
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