Question

我最近接受了另一位同事完成的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。

我已经添加了这个来检查app.cs构造函数中的数据库状态：

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，已创建数据库，但未应用先前的迁移：-s 因此，如果我想进行“添加迁移”，控制台会告诉我有一些迁移等待更改。

所以，我手动做“update-database”，但是我得到了这个错误：“每个表中的列名必须是唯一的。表'dbo.Segment'中的列名'TrackName'被多次指定”

为什么在创建数据库时未应用迁移？

任何人都可以帮助我吗？我是CF5的新手:-) 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)
    {

    }
}

EF5 Code First Migration - 创建数据库和迁移错误

1 个答案: