Fluent Nhibernate 错误外键

Question

我知道这个问题有一些问题，但我找不到正确的答案，所以请让我问这个问题，看看是否有人能给我正确的答案

我的数据库有以下方案（表格经过简化以关注问题）

Table Project
idProject INT PK
projectName string UNIQUE
numOfItems INT 

Table Item
serialNumber integer PK
idProject integer PK, FK (references idProject table Project)
fileName string PK

Table Analysis
serialNumber integer PK, FK (references serialNumber table Item)
dateMeasure Date PK
fileName string PK

我将这些表用 C# 编码如下

class Analysis{
        public virtual Item serialNum{ get; set; }
        public virtual DateTime dateMeasure { get; set; }
        public virtual string fileName { get; set; }

        public override int GetHashCode(){
             return (fileName.GetHashCode() * serialNum.GetHashCode() * dateMeasure.GetHashCode());
        }

        public override bool Equals(object obj){
            if (obj == null || obj.GetType() != GetType()) return false;

            Analysis a = (Analysis)obj;

            return (a.serialNum == serialNum && a.fileName == fileName && a.dateMeasure == dateMeasure);
        }
}

class Item{
        public virtual int serialNumber { get; set; }
        public virtual Proyecto idProject { get; set; }
        public virtual string fileName { get; set; }
        public virtual DateTime measureDate { get; set; }

        public override int GetHashCode(){
            return (fileName.GetHashCode() * serialNumber.GetHashCode() * idProject.GetHashCode());
        }

        public override bool Equals(object obj)
        {
            if (obj == null || obj.GetType() != GetType()) return false;

            Item i = (Item)obj;

            return (i.serialNumber == serialNumber&& i.fileName== fileName&& d.idProject == idProject);
        }
}

class Project
    {
        public virtual int idProject { get; set; }
        public virtual string projectName{ get; set; }
        public virtual int numItems { get; set; }
    }

以及实体的以下映射

class AnalysisMap: ClassMap<Analysis>
    {

        public AnalysisMap()
        {
            CompositeId()
                .KeyReference(x=> x.serialNumber)
                .KeyProperty(x => x.dateMeasure)
                .KeyProperty(x => x.fileName);
        }
}

class ItemMap : ClassMap<Item>
    {
        public ItemMap()
        {
            CompositeId()
                .KeyProperty(x => x.fileName)
                .KeyReference(x => x.idProject)
                .KeyProperty(x => x.serialNumber);
            Map (x=>x.measureDate).Column("dateMeasure").Not.Nullable();
            References(x => x.idProject).Column("idProject");
        }
    }

class ProjectMap : ClassMap<Project>
    {
        public ProjectMap()
        {
            Id(x => x.idProject).GeneratedBy.Identity().Column("idProject");
            Map(x => x.projectName).Column("projectName").Unique();
            Map(x => x.NumItems).Column("numOfItems").Not.Nullable().Default("0");
        }
    }

因此，当我尝试使用以下代码打开会话时，出现错误 "Foreign key (FK9CF1483E7BAABE07:Analysis [serialNum])) must have same number of columns as the referenced primary key (Item [fileName, idProject, serialNumber])"

try{
   ISessionFactory sf = Fluently.Configure()
   .Database(SQLiteConfiguration.Standard.InMemory().ShowSql()
   .ConnectionString("server=local;Data Source= data_source;Integrated Security=SSPI;"))
   .Mappings(m => m.FluentMappings.AddFromAssemblyOf<Project>()
   .AddFromAssemblyOf<Item>()
   .AddFromAssemblyOf<Analysis>()).BuildSessionFactory();

   ISession session = sf.OpenSession();
   lblStatus.Text = "OK";
}
catch (Exception ex){
   lblStatus.Text = ex.Message.ToString();
}

那么我应该如何获取映射才能使其正常工作？

Answer 1

首先你要理解错误，你说：

Table Analysis serialNumber integer PK, FK (references serialNumber table Item)

这是错误的，序列号是引用serialNumber、idProject和filename的FK，因为三个一起形成了table项PK。这就是为什么错误说“...必须具有与引用的主键相同的列数（Item [fileName，idProject，serialNumber]）”，table Item 的主键由三个字段组成而不是只能按照您的建议 "serialNumber" 进行。

看看这个link，它解释了如何配置复合外键，这就是你需要的。

如果您需要任何帮助，请在下方评论。

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