Question

情况就是这样：我们有两个数据库，一个叫做生产，另一个叫做测试。

我正在生成数据库中插入实体，并启用了以下属性：

Property(c => c.MyPrimaryKey).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

但是我需要使用相同的主键在另一端复制这些信息，所以我可以删除并重新插入所有内容，而不必担心相关信息的状态。

我有两张桌子：

A B C

1 1X X

1Y Y

所以我想更新对象“X”而不破坏它与对象“1”的关系。我可以根据其他信息链接这些对象，但这比仅使用相同的主键删除和插入要复杂得多。

这是执行此操作的代码：

        //Turn on identity insert
        var setIdentityOnCommands = new List<string>(new[]
        {
            @"SET IDENTITY_INSERT Tab_relatorios ON",
            @"SET IDENTITY_INSERT Tab_views ON",
            @"SET IDENTITY_INSERT Tab_views_colunas ON",
            @"SET IDENTITY_INSERT Tab_views_comandos ON",
        });
            //Get the information from production database
            using (var source = new OuroReportsContext(sourceConnectionString))
            {
                sourceReports =
                    source.Reports
                        .Include("Views.Config.ConfigColumns.ViewColumn")
                        .Include("Views.Config.ConfigGroups.ViewColumn")
                        .Include("Views.ViewColumns")
                        .Where(c => idReports.Contains(c.IdReport))
                        .ToList();

                sourceCommands =
                    source.Views.Include("Command")
                        .Include("Report")
                        .Where(c => idReports.Contains(c.Report.IdReport))
                        .ToList().Select(c => c.Command).ToList();
            }

            //Run the commands above in the target(test database)
            using (var context = new OuroReportsContext(targetConnectionString))
            {
                foreach (var command in setIdentityOnCommands)
                {
                    context.Database.ExecuteSqlCommand(command);
                }
            }

            //Create a new scope
            using (var scope = new TransactionScope(TransactionScopeOption.Suppress))
            {
                using (var target = new OuroReportsContext(targetConnectionString))
                {
                    //Execute a procedure that will make the delete job
                    idReports.ForEach(c => target.Database.ExecuteSqlCommand("exec sp_mng_Deletar_Relatorio " + c));

                    //Below is the inserting and checking process 
                    sourceReports.ForEach(c => c.ReportGroup = target.ReportGroups
                        .SingleOrDefault(d =>
                            d.ReportGroupDescription.Equals(groupName)));
                    foreach (var command in sourceCommands)
                    {
                        target.Commands.AddOrUpdate(c => c.CommandName, command);
                    }
                    sourceReports
                        .ForEach(c => c.Views.Command = target.Commands.Single
                                    (d => d.CommandName.Equals(c.Views.SqlCommandName)));

                    sourceReports.ForEach(c => target.Reports.Add(c));
                    sourceReports.ForEach(c => c.Views.Config.ToList().ForEach(d => configNames.Add(d.ConfigName)));

                    //Verify if has any error.
                    var errors = target.GetValidationErrors();
                    if (!errors.Any())
                    {
                        target.SaveChanges();
                        scope.Complete();
                    }
                }
            }

问题是：它不起作用= [。继续使用标识主键

插入对象

实体框架持久化主体上没有标识的实体

0 个答案: