这是我的一个表建议（类型是一个枚举，如 {Hardware, Software, ...} - 这意味着 MS SQL 中的 Types 表带有 id, Type）：
类型：ID、类型
属性：Id、Title、TypeId
Project_Attributes：Project_Id、AttributeId（多对多桥接表）
项目：ID、标题、...
其实一张千言万语的图，就算是这么短的时间写出来的代码（所以需要经过深思熟虑的修改）会提供更多的思路。这是代码优先模型，因此您可以运行并让它为您创建表：
string defaultConString =
@"server=.\SQLExpress;Database=SampleDb;Trusted_Connection=yes;";
void Main()
{
CreateData();
// check db state
ListData();
// Done with sample database. Delete.
// new SampleContext(defaultConString).Database.Delete();
}
private void CreateData()
{
var db = new SampleContext(defaultConString);
if (db.Database.CreateIfNotExists())
{
// Create some types
var tHW = new Type { Name = "Hardware" };
var tSW = new Type { Name = "Software" };
var tFW = new Type { Name = "Firmware" };
db.Types.AddRange(new Type[] {tHW,tSW,tFW});
db.SaveChanges();
// create some Attributes using types above
var a1 = new Attribute
{
Name = "Macbook Pro",
Type = tHW,
AttrProperties = new List<AttrProperty> {
new AttrProperty{ Description=@"15"" retina" },
new AttrProperty{ Description=@"i9-8950HK" },
new AttrProperty{ Description=@"32Gb DDR4 RAM" },
new AttrProperty{ Description=@"512Gb SSD" },
new AttrProperty{ Description=@"AMD Radeon Pro 555" },
new AttrProperty{ Description=@"OSX Mojave 10.14" },
}
};
var a2 = new Attribute
{
Name = "iMac",
Type = tHW,
AttrProperties = new List<AttrProperty> {
new AttrProperty{ Description=@"27"" retina 5K" },
new AttrProperty{ Description=@"i5 3.4Ghz" },
new AttrProperty{ Description=@"40Gb DDR4 RAM" },
new AttrProperty{ Description=@"1Tb Fusion" },
new AttrProperty{ Description=@"AMD Radeon Pro 570" },
new AttrProperty{ Description=@"OSX Mojave 10.14" },
}
};
var a3 = new Attribute
{
Name = "PC",
Type = tHW,
AttrProperties = new List<AttrProperty> {
new AttrProperty{ Description=@"AMD Ryzen Threadripper 1950x" },
new AttrProperty{ Description=@"64Gb RAM" },
new AttrProperty{ Description=@"1 Tb 7400 RPM" },
new AttrProperty{ Description=@"512Gb M2 mSATA" },
new AttrProperty{ Description=@"AMD Radeon Pro 570" },
new AttrProperty{ Description=@"Linux-Debian 9.5" },
}
};
var a4 = new Attribute
{
Name = "Database",
Type = tSW,
AttrProperties = new List<AttrProperty> {
new AttrProperty{ Description=@"postgreSQL" },
new AttrProperty{ Description=@"11 (beta)" },
}
};
var a5 = new Attribute
{
Name = "SomeROM",
Type = tFW,
AttrProperties = new List<AttrProperty> {
new AttrProperty{ Description=@"SomeROM update" },
new AttrProperty{ Description=@"Some version" },
}
};
db.Attributes.AddRange(new Attribute[] {a1,a2,a3,a4,a5});
// Some projects using those
var p1 = new Project
{
Name = "P1",
StartDate = new DateTime(2018, 1, 1),
Attributes = new List<Attribute>() { a1, a2, a4 }
};
var p2 = new Project
{
Name = "P2",
StartDate = new DateTime(2018, 1, 1),
Attributes = new List<Attribute>() { a1, a3, a5 }
};
var p3 = new Project
{
Name = "P3",
StartDate = new DateTime(2018, 1, 1),
Attributes = new List<Attribute>() { a2, a3, a4, a5 }
};
db.Projects.AddRange(new Project[] { p1,p2,p3 });
db.SaveChanges();
}
}
private void ListData()
{
var db = new SampleContext(defaultConString);
// db.Database.Log =Console.Write;
foreach (var p in db.Projects.Include("Attributes").ToList())
{
Console.WriteLine($"Project {p.Name}, started on {p.StartDate}. Has Attributes:");
foreach (var a in p.Attributes)
{
Console.WriteLine($"\t{a.Name} [{a.Type.Name}] ({string.Join(",",a.AttrProperties.Select(ap => ap.Description))})");
}
}
}
public class Type
{
public int TypeId { get; set; }
public string Name { get; set; }
public virtual List<Attribute> Attributes { get; set; }
public Type()
{
Attributes = new List<Attribute>();
}
}
public class Attribute
{
public int AttributeId { get; set; }
public string Name { get; set; }
public int TypeId { get; set; }
public virtual Type Type { get; set; }
public virtual List<Project> Projects { get; set; }
public virtual List<AttrProperty> AttrProperties { get; set; }
public Attribute()
{
Projects = new List<Project>();
}
}
public class AttrProperty
{
public int AttrPropertyId { get; set; }
public string Description { get; set; }
public virtual Attribute Attribute {get;set;}
}
public class Project
{
public int ProjectId { get; set; }
public string Name { get; set; }
public DateTime StartDate { get; set; }
public virtual List<Attribute> Attributes {get;set;}
public Project()
{
Attributes = new List<Attribute>();
}
}
public class SampleContext : DbContext
{
public SampleContext(string connectionString) : base(connectionString) { }
public DbSet<Type> Types { get; set; }
public DbSet<Attribute> Attributes { get; set; }
public DbSet<Project> Projects { get; set; }
}
如果这不是一个多用户的大项目，那么看看 LiteDB。这可能正是您正在寻找的内容，并且可以在数小时甚至数分钟内学会。