c# - 如何在 Entity Framework 中重命名迁移表？

Question

我想将迁移表重命名为 dbo.__MigrationHistory至SYSTEM.MigrationsHistory 。我该怎么做？

我需要继承IdentityDbContext不是来自HistoryContext因此我无法使用代码:modelBuilder.Entity<HistoryRow>().ToTable(tableName: "MigrationHistory", schemaName: "SYSTEM")

我附上我正在使用的代码:

    public class ApplicationDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, long, ApplicationUserLogin, ApplicationUserRole, ApplicationUserClaim>
    {
        public ApplicationDbContext()
            : base("DefaultConnection")
        {
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);

            // ACCOUNT
            modelBuilder.Entity<ApplicationUser>().ToTable(tableName: "Users", schemaName: "ACCOUNT");
            modelBuilder.Entity<ApplicationRole>().ToTable(tableName: "Roles", schemaName: "ACCOUNT");
            modelBuilder.Entity<ApplicationUserLogin>().ToTable(tableName: "UserLogins", schemaName: "ACCOUNT");
            modelBuilder.Entity<ApplicationUserRole>().ToTable(tableName: "UserRoles", schemaName: "ACCOUNT");
            modelBuilder.Entity<ApplicationUserClaim>().ToTable(tableName: "UserClaims", schemaName: "ACCOUNT");

            // SYSTEM
            // modelBuilder.Entity<HistoryRow>().ToTable(tableName: "MigrationHistory", schemaName: "SYSTEM");
        }


        public static ApplicationDbContext Create()
        {
            return new ApplicationDbContext();
        }
    }

提前致谢

问候

Answer 1

重命名迁移表的步骤

1. 创建类MyHistoryContext:

    using System.Data.Common;
    using System.Data.Entity;
    using System.Data.Entity.Migrations.History;

    namespace CustomizableMigrationsHistoryTableSample
    {
        public class MyHistoryContext : HistoryContext
        {
            public MyHistoryContext(DbConnection dbConnection, string defaultSchema)
                : base(dbConnection, defaultSchema)
            {
            }

            protected override void OnModelCreating(DbModelBuilder modelBuilder)
            {
                base.OnModelCreating(modelBuilder);
                modelBuilder.Entity<HistoryRow>().ToTable(tableName: "MigrationHistory", schemaName: "SYSTEM");
            }
        }
    }

创建类ModelConfiguration

    using System.Data.Entity;

    namespace CustomizableMigrationsHistoryTableSample
    {
        public class ModelConfiguration : DbConfiguration
        {
            public ModelConfiguration()
            {
                this.SetHistoryContext("System.Data.SqlClient",
                    (connection, defaultSchema) => new MyHistoryContext(connection, defaultSchema));
            }
        }
    }

如果您有现有迁移，则需要删除迁移和数据库才能执行以下命令:

用于创建migrations文件夹和configuration类:

enable-migrations

用于添加迁移first_migration

add-migration <migration_name>

用于在数据库中应用迁移

update-database

鸣谢:Ivan Stoev

Before you start you need to know that you can customize the migrations history table only before you apply the first migration..

详细信息: Customizing the migrations history table