EF5代码首先迁移 - 创建数据库和迁移错误

Question

我最近采取了由另一个同事完成的CF5项目，我想添加一个新功能，但我有一些错误。所以，我想为这个应用程序创建一个自动创建和自动迁移系统。

我已经添加了这个检查在app.cs构造数据库状态：

using (var db = new DatabaseContext()) 
     { 
      do 
      { 
       Cursor.Current = Cursors.WaitCursor; 
       // If DB already exists, tests his integrity 
       if (db.Database.Exists() == true) 
       { 
        bool isCompatible = false; 
        bool isMetadataMissing = false; 

        // Tests compatibility between DB and EF model 
        try 
        { 
         isCompatible = db.Database.CompatibleWithModel(true); 
        } 
        catch (Exception e) 
        { 
         // Exception has thrown because the database don't contains metadata informations 
         isCompatible = false; 
         isMetadataMissing = true; 
         m_Logger.Error("Error during checking compatibility of database : " + e.Message, e); 
        } 

        // If database is compatible, we quit de tests 
        if (isCompatible) 
        { 
         result = true; 
         isWorkRequired = false; 
         m_Logger.Debug("Database Ok"); 
         Cursor.Current = Cursors.Default; 
        } 
        else 
        { 
         // If DB isn't compatible and metadata was found on database, we proceed the migration of database 
         if (!isMetadataMissing) 
         { 
          try 
          { 
           m_Logger.Debug("Migration needed on database"); 
           db.Database.Initialize(true); 
          } 
          catch (Exception eMig) 
          { 
           result = false; 
           isWorkRequired = false; 
           m_Logger.Debug("Can't migrates database. "+eMig.Message); 
           Cursor.Current = Cursors.Default; 
           messageBoxViewModel = new MessageBoxViewModel(Resources.Resources.ErrorDBMetaError, 
            MessageBoxButton.OK, MessageBoxImage.Error); 
           messageBoxView = new MessageBoxView(messageBoxViewModel); 
           messageBoxView.ShowDialog(); 
          } 
         } 
         else // Warns the user that there is a problem with the ConnexionString 
         { 
          result = false; 
          isWorkRequired = false; 
          m_Logger.Debug("Can't update database, the metadata is missing"); 
          Cursor.Current = Cursors.Default; 
          messageBoxViewModel = new MessageBoxViewModel(Resources.Resources.ErrorDBMetaMissing, 
           MessageBoxButton.OK,MessageBoxImage.Error); 
          messageBoxView = new MessageBoxView(messageBoxViewModel); 
          messageBoxView.ShowDialog(); 
         } 
        } 
       } 
       else 
       { 
        m_Logger.Debug("Database is Mising"); 
        Cursor.Current = Cursors.Default; 
        messageBoxViewModel = new MessageBoxViewModel(Resources.Resources.QtCreateDB, 
         MessageBoxButton.YesNo,MessageBoxImage.Question); 
        messageBoxView = new MessageBoxView(messageBoxViewModel); 
        messageBoxView.ShowDialog(); 

        if (messageBoxViewModel.Result == MessageBoxResult.Yes) 
        { 
         Cursor.Current = Cursors.WaitCursor; 
         m_Logger.Debug("Creating database"); 
         db.Database.Create(); 
         //db.Database.Initialize(true); 

         m_Logger.Debug("Adds roles objects"); 
         // Adds initial data 

         m_Logger.Debug("Database created"); 
        } 
        else 
        { 
         isWorkRequired = false; 
        } 
       } 
      } while (isWorkRequired); 
     } 

之后，该数据库已创建，但没有应用以前迁移：-s 所以，如果我想要做“添加迁移”控制台告诉我有一些迁移正在等待更改。

因此，我做了“update-database”manualy，但我得到这个错误：“每个表中的列名必须是唯一的。”dbo.Segment“表中的列名'TrackName'被指定多次”

为什么我在创建数据库时没有应用迁移？

任何人都可以帮助我吗？我是新与CF5 :-) 谢谢

Answer 1

Segment.CS：

public class Segment 
{ 
    public System.Guid Id { get; set; } 
    public System.Guid NetworkId { get; set; } 
    public string Type { get; set; } 
    public string Name { get; set; } 
    public int SourceIndex { get; set; } 
    public int TargetIndex { get; set; } 
    public bool IsInitialized { get; set; } 
    public int NeighborNodeDistance { get; set; } 
    public string TrackName { get; set; } 
    public bool IsTrackNameFixed { get; set; } 
    public byte[] GeometryParameters { get; set; } 
    public Nullable<System.Guid> SourceNodeId { get; set; } 
    public Nullable<System.Guid> TargetNodeId { get; set; } 
    public double Length { get; set; } 
    public virtual Network Network { get; set; } 
} 

SegmentMap.CS：

public class SegmentMap : EntityTypeConfiguration<Segment> 
{ 
    public SegmentMap() 
    { 
     // Primary Key 
     this.HasKey(t => t.Id); 

     // Properties 
     this.Property(t => t.Type) 
      .HasMaxLength(255); 

     this.Property(t => t.Name) 
      .IsRequired() 
      .HasMaxLength(50); 

     this.Property(t => t.GeometryParameters) 
     .IsRequired() 
     .HasMaxLength(512); 

     // Table & Column Mappings 
     this.ToTable("Segment"); 
     this.Property(t => t.Id).HasColumnName("Id"); 
     this.Property(t => t.NetworkId).HasColumnName("NetworkId"); 
     this.Property(t => t.Type).HasColumnName("Type"); 
     this.Property(t => t.Name).HasColumnName("Name"); 
     this.Property(t => t.SourceIndex).HasColumnName("SourceIndex"); 
     this.Property(t => t.TargetIndex).HasColumnName("TargetIndex"); 
     this.Property(t => t.IsInitialized).HasColumnName("IsInitialized"); 
     this.Property(t => t.NeighborNodeDistance).HasColumnName("NeighborNodeDistance"); 
     this.Property(t => t.GeometryParameters).HasColumnName("GeometryParameters"); 
     this.Property(t => t.SourceNodeId).HasColumnName("SourceNodeId"); 
     this.Property(t => t.TargetNodeId).HasColumnName("TargetNodeId"); 
     this.Property(t => t.Length).HasColumnName("Length"); 
     this.Property(t => t.TrackName).HasColumnName("TrackName"); 
     this.Property(t => t.IsTrackNameFixed).HasColumnName("IsTrackNameFixed"); 

     // Relationships 
     this.HasRequired(t => t.Network) 
      .WithMany(t => t.Segments) 
      .HasForeignKey(d => d.NetworkId); 

    } 
} 

Configuration.CS：

using System.Data.Entity.Migrations; 
internal sealed class Configuration : DbMigrationsConfiguration<DatabaseContext> 
{ 
    public Configuration() 
    { 
     AutomaticMigrationsEnabled = true; 
     AutomaticMigrationDataLossAllowed = false; 
    } 

    protected override void Seed(DatabaseContext context) 
    { 

    } 
}