Question

我正在尝试构建一个迁移控制台应用程序，该应用程序可以从头开始，即在新安装的SQL Server上，包括具有凭据的专用用户，该用户应该是db_owner。

我可以在PostgreSQL上运行它，但是需要为SQL Server获得类似的解决方案。

在致电context.Database.Migrate()之前，我先致电CheckDatabaseCreated(context.Database, configuration)，基本上是这样做的：

尝试使用给定的连接字符串进行连接
如果失败，它将用SA和SA密码替换用户和密码并连接到主机。
创建登录名（如果不存在）。
创建数据库（如果它不存在）。
仍以SA身份连接到新创建的数据库。
使用登录名创建用户，并添加db_owner角色。
最后，它再次尝试使用原始连接字符串进行连接-这是失败的地方。

使用HeidiSQL，我可以看到数据库已创建，但是我只能使用SA凭据进行连接。

    private static void CheckDatabaseCreated(DatabaseFacade contextDatabase, IConfiguration configuration)
    {
        bool canConnect;
        try
        {
            canConnect = contextDatabase.CanConnect();
            Console.WriteLine("Database connected succesfully.");
        }
        catch (Exception e)
        {
            Console.WriteLine($"Unable to connect to database: {e.Message}");
            canConnect = false;
        }
        if (!canConnect)
        {
            var builder = new SqlConnectionStringBuilder(configuration["ConnectionString"]);
            var originalUser = builder.UserID;
            var originalPassword = builder.Password;
            var originalDatabase = builder.InitialCatalog;
            builder.UserID = _masterUsername;
            builder.Password = _masterPassword;
            builder.InitialCatalog = "master";
            var login = $"{originalUser}Login";

            SqlConnection conn = new SqlConnection(builder.ConnectionString);
            try
            {
                conn.Open();
                // Check if login exists
                SqlCommand command = new SqlCommand($"SELECT COUNT(*) FROM master.sys.server_principals WHERE name = '{login}'", conn);
                object result = command.ExecuteScalar();
                result = (result == DBNull.Value) ? null : result;
                if (Convert.ToInt32(result) < 1)
                {
                    Console.WriteLine("Login does not exist - creating.");
                    command = new SqlCommand($"CREATE LOGIN [{login}] WITH PASSWORD = N'{originalPassword}', CHECK_POLICY = OFF, CHECK_EXPIRATION = OFF", conn);
                    command.ExecuteNonQuery();
                }
                // Check if database exists
                command = new SqlCommand($"SELECT COUNT(*) FROM master.sys.databases WHERE name = '{originalDatabase}'", conn);
                result = command.ExecuteScalar();
                result = (result == DBNull.Value) ? null : result;
                if (Convert.ToInt32(result) < 1)
                {
                    Console.WriteLine("Database does not exist - creating.");
                    command = new SqlCommand($"CREATE DATABASE \"{originalDatabase}\" ", conn);
                    command.ExecuteNonQuery();
                }
                conn.Close();
                // Now connect to the (newly created) database - still as sa.
                builder.InitialCatalog = originalDatabase;
                conn = new SqlConnection(builder.ConnectionString);
                try
                {
                    conn.Open();
                    command = new SqlCommand($"CREATE USER [{originalUser}] FOR LOGIN [{login}]", conn);
                    command.ExecuteNonQuery();

                    command = new SqlCommand($"EXEC sp_addrolemember 'db_owner', '{originalUser}'", conn);
                    command.ExecuteNonQuery();

                    conn.Close();
                }
                catch (Exception e)
                {
                    Console.WriteLine($"Unable to connect to {originalDatabase} database: {e.Message}");
                }
                // Finally try to connect as the user created above.
                builder = new SqlConnectionStringBuilder(configuration["ConnectionString"]);
                conn = new SqlConnection(builder.ConnectionString);
                try
                {
                    conn.Open();
                }
                catch (Exception e)
                {
                    // This is where it fails.
                    Console.WriteLine($"Unable to connect to database: {e.Message}");
                }
            }
            catch (Exception e)
            {
                Console.WriteLine($"Unable to connect to database: {e.Message}");
            }
        }
    }

Answer 1

SQL Server连接字符串中的User ID表示登录名或包含的数据库用户。

所以您的问题在这里：

   var login = $"{originalUser}Login";

此登录名不是您的连接字符串中引用的登录名。没有理由登录名和数据库用户需要不同的名称。因此，让它们相同：

   var login = originalUser;

在新的SQL Server上进行EF Core迁移

1 个答案: