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我正在尝试使用我.Net core console app和我的本地MySQL使用entity framework core Code first方法中的模型创建迁移，一切都很好，但是在创建迁移并尝试使用之后，update-database我在NugetPackage Console

楷模：

领域

class Branche
{
    [Key]
    public string ID { get; set; }
    [Required]
    public string Title { get; set; }

    public ICollection<Student> Students { get; set; }
}

学生

class Student
{
    [Key]
    public string ID { get;        set; }
    public string Name      { get; set; }
    public string BrancheID { get; set; }

    public Branche Branche { get; set; }
}

数据库上下文：

class SchoolContext:DbContext
{
    public SchoolContext()
    {
        
    } 
    public SchoolContext(DbContextOptions<SchoolContext> dbContextOptions):base(dbContextOptions)
    {
        
    }


    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {

        // Map entities to tables
        modelBuilder.Entity<Branche>().ToTable("Branche");
        modelBuilder.Entity<Student>().ToTable("Student");

        // Configure Primary Keys  
        modelBuilder.Entity<Branche>().HasKey(b => b.ID).HasName("PK_Branche");
        modelBuilder.Entity<Student>().HasKey(s => s.ID).HasName("PK_Student");

        //Configure Relations
        modelBuilder.Entity<Student>().HasOne<Branche>().WithMany().HasPrincipalKey(b => b.ID)
                    .HasForeignKey(s => s.BrancheID).OnDelete(DeleteBehavior.NoAction)
                    .HasConstraintName("FK_Student_Branche");
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {

        IConfiguration configuration = new ConfigurationBuilder()
                                      .SetBasePath(Directory.GetParent(AppContext.BaseDirectory).FullName)
                                      .AddJsonFile("appsettings.json", false).Build();

        optionsBuilder.UseMySql(configuration.GetConnectionString("MySQL"), ServerVersion.AutoDetect(configuration.GetConnectionString("MySQL")));
    }

    public DbSet<Branche> Branches { get; set; }
    public DbSet<Student> Students { get; set; }
}

错误：

Failed executing DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE `Branches` (
    `ID` nvarchar(450) NOT NULL,
    `Title` nvarchar(max) NOT NULL,
    CONSTRAINT `PK_Branches` PRIMARY KEY (`ID`)
);

屏幕

我使用Pomelo.EntityFrameworkCore.MySql 5.0.0-alpha.2

那么请对此问题有任何帮助吗？

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0 回答 0