Question

我有两个相同的sql表：dbo.Smith_Products和temp.Smith_Products。

我在不同的命名空间下有两个相同的类：IMS.Model.dbo和IMS.Model.temp

我正在尝试使用Mapper将数据从一个表移动到另一个表：

        var spc = new Smith_ProductsController();
        // get all Smith_Products records
        spc.Gets();

        // our temp.Smith_Products entity -- exact same table definition, exact same class definition. Different sql schema, different namespace
        var spctemp = new imstemp.Smith_ProductsController();

        // config and initialize our mapper
        var config = new MapperConfiguration(cfg => cfg.CreateMap<Smith_Products, imstemp.Smith_Products>());
        var mapper = config.CreateMapper();

        // copy from dbo recordset to temp recordset
        spctemp.Recordset = mapper.Map<Smith_Products[], IList<imstemp.Smith_Products>>(spc.Recordset.ToArray());

        spctemp.Repository.DataSet.Create();
        spctemp.Repository.DataSet.AddOrUpdate(spctemp.Recordset.ToArray());

        var x = spctemp.Repository.SaveChanges();
        // on first run with an empty temp.Smith_Products table, this works fine. Inserts 114 records
        // on subsequent runs, x should = 0 because we've not changed or added anything
        // however, this is not the case. Second run=108, 3rd run=34, etc. Records are being duplicated excecpt for ProductID, our key (identity,increment)

        // then we do this each time
        // retrieve the temp.Smith_Product records
        spctemp.Gets();
        // Change nothing
        spctemp.Repository.DataSet.AddOrUpdate(spctemp.Recordset.ToArray());
        // x should equal 0 each time
        x = spctemp.Repository.SaveChanges();
        //and it does.

Repository类只是我的控制器的子类：

    public class RepositoryContext : DbContext
    {
        public DbSet<Smith_Products> DataSet { get; set; }

        public RepositoryContext()
        {
            Database.Connection.ConnectionString = "xxx"
        }
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Smith_Products>().ToTable("dbo.Smith_Products");
        }
    }
    public RepositoryContext Repository=new RepositoryContext();

我的问题是，当这些记录不应该插入时，添加重复记录会发生什么？映射器是否未正确转换？

谢谢，克里斯

Answer 1

我想通了。

ProductID不一定在两个表之间匹配。当我将原始表复制到临时模式时，我没有将Identity种子设置为429，即原始表中的下一个递增键。

想出来，瞧，一切都是洁净的。

克里斯

使用DbContext和DbSet的意外行为

1 个答案: