Model表

    public class Goods
    {

        public string ID { get; set; }

        public string CreatedBy { get; set; }
        public DateTime CreatedTime { get; set; }

        public string ModifiedBy { get; set; }
        
        public DateTime ModifiedTime { get; set; }

        public string GoodsName { get; set; }
        public int GoodsNum { get; set; }
    }
 

配置檔案

   public class GoodsEntityTypeConfiguration : IEntityTypeConfiguration<Goods>
    {
        public void Configure(EntityTypeBuilder<Goods> builder)
        {
            builder.ToTable("Sample_Goods_01");

            builder.HasKey(ci => ci.ID);

            builder.Property(ci => ci.ID).IsRequired();

            builder.Property(cb => cb.CreatedBy)
                .IsRequired()
                .HasMaxLength(20);
            builder.Property(cb => cb.CreatedTime)
                .IsRequired();

            builder.Property(cb => cb.ModifiedBy)
                .IsRequired()
                .HasMaxLength(20);

            builder.Property(cb => cb.GoodsName)
                .IsRequired();

            builder.Property(cb => cb.GoodsNum)
                .IsRequired();
        }
    }
 

在MYSQL裡，想生成ID儲存GUID，開始的時候直接生成 string 生成 text
沒有達到我們的效果。ID應該為char(36)，CreatedBy 應該為 varchar(20)
應該改為

   public class GoodsEntityTypeConfiguration : IEntityTypeConfiguration<Goods>
    {
        public void Configure(EntityTypeBuilder<Goods> builder)
        {
            builder.ToTable("Sample_Goods_01");

            builder.Property(ci => ci.ID).IsRequired().HasMaxLength(36).HasColumnType("char(36)");

            builder.Property(cb => cb.CreatedBy)
                .IsRequired()
                .HasMaxLength(20).HasColumnType("varchar(20)");

            builder.Property(cb => cb.CreatedTime)
                .IsRequired();

            builder.Property(cb => cb.ModifiedBy)
                .IsRequired()
                .HasMaxLength(20).HasColumnType("varchar(20)");

            builder.Property(cb => cb.GoodsName)
                .IsRequired().HasColumnType("varchar(20)");

            builder.Property(cb => cb.GoodsNum)
                .IsRequired();
        }
    }
 

參考：

Jeffcky，EntityFramework Core對映關係詳解
MVC - 10.CodeFrist
蝌蝌，EF6(CodeFirst)+MySql開發脫坑指南