C# Nhibernate正在创建具有对象属性的对象_C#_Nhibernate_Fluent Nhibernate

C# Nhibernate正在创建具有对象属性的对象

c# nhibernate fluent-nhibernate

C# Nhibernate正在创建具有对象属性的对象,c#,nhibernate,fluent-nhibernate,C#,Nhibernate,Fluent Nhibernate,我刚开始和NHibernate合作。我有两个目标： public class Supplier { public virtual int id{get;set;} public virtual SupplierAddress address{get;set;} public virtual string Name{get;set;} } public class SupplierAddress { public virtual int id{get;set;}

我刚开始和NHibernate合作。我有两个目标：

public class Supplier 
{
    public virtual int id{get;set;}
    public virtual SupplierAddress address{get;set;}
    public virtual string Name{get;set;}
}
public class SupplierAddress 
{
    public virtual int id{get;set;}
    public virtual Supplier{get;set;}
    public virtual string SupplierAddressLine{get;set;}
}

当我想创建一个新的

供应商

时，我会创建一个新对象：

var supplierAddress = new SupplierAddress {
    SupplierAddressLine = "someLine"
}

var supplier = new Supplier 
{
    Name = "someName",
    SupplierAddress = SupplierAddressLine 
}

然后，当我尝试使用以下命令保存时：

_session.Save(supplier);

我得到一个错误：“无法将值NULL插入列'id'

更新1映射供应商地址

对于供应商

您应该在

供应商

→ <代码>供应商地址关系：

References(s => s.SupplierAddress)
    .Column("SupplierAddressId")
    .Not.Nullable()
    .Cascade.All(); /* Cascade operations that happen on `Supplier` */

否则，NHibernate不知道保存父级（

供应商

）也应该保存子级（

供应商地址

）

编辑：我认为您实际上在此处错误地使用了

引用
在映射中，当你说一个实体引用另一个时，你基本上是在告诉NHibernate这个关系的另一边是一个有很多
在您的情况下，Supplier
和SupplierAddress
实际上都没有多个SupplierAddress
es或Supplier
s
考虑到这一点，您可能指的是两件事之一：
一个供应商地址
由多个供应商
共享。这意味着供应商地址
实际上有多个供应商
，但供应商
只有一个供应商地址

在C类中，这意味着供应商地址
有一个供应商的集合
（或者根本没有提及供应商
）
在本例中，您的数据库表如下所示：
public class Supplier
{   
    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress { get; set; }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        References(s => s.SupplierAddress)
            .Column("SupplierAddressId")
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");

        Map(s => s.AddressLine1)
            .Column("AddressLine1")
            .Not.Nullable()
            .Length(255);
    }
}

public class Supplier
{   
    private SupplierAddress supplierAddress;

    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress 
    {
        get { return this.supplierAddress; }
        set 
        { 
            this.supplierAddress = value;
            this.supplierAddress.Supplier = this;
        }
    }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }

    public virtual Supplier Supplier { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        HasOne(s => s.SupplierAddress).PropertyRef(s => s.Supplier)
            .Access.CamelCaseField()
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        Map(s => s.AddressLine1).Column("AddressLine1");
        References(s => s.Supplier).Column("SupplierId").Unique();
    }
}

创建表[供应商地址]
(
[Id]int-identity（1,1）主键群集，
[AddressLine1]nvarchar（255）不为空
);
创建表[供应商]
(
[Id]int-identity（1,1）主键群集，
[SupplierAddressId]int非空引用[SupplierAddress]（[Id]）
)

您的C#类将如下所示：
public class Supplier
{   
    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress { get; set; }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        References(s => s.SupplierAddress)
            .Column("SupplierAddressId")
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");

        Map(s => s.AddressLine1)
            .Column("AddressLine1")
            .Not.Nullable()
            .Length(255);
    }
}

public class Supplier
{   
    private SupplierAddress supplierAddress;

    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress 
    {
        get { return this.supplierAddress; }
        set 
        { 
            this.supplierAddress = value;
            this.supplierAddress.Supplier = this;
        }
    }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }

    public virtual Supplier Supplier { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        HasOne(s => s.SupplierAddress).PropertyRef(s => s.Supplier)
            .Access.CamelCaseField()
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        Map(s => s.AddressLine1).Column("AddressLine1");
        References(s => s.Supplier).Column("SupplierId").Unique();
    }
}

您的映射如下所示：
public class Supplier
{   
    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress { get; set; }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        References(s => s.SupplierAddress)
            .Column("SupplierAddressId")
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");

        Map(s => s.AddressLine1)
            .Column("AddressLine1")
            .Not.Nullable()
            .Length(255);
    }
}

public class Supplier
{   
    private SupplierAddress supplierAddress;

    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress 
    {
        get { return this.supplierAddress; }
        set 
        { 
            this.supplierAddress = value;
            this.supplierAddress.Supplier = this;
        }
    }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }

    public virtual Supplier Supplier { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        HasOne(s => s.SupplierAddress).PropertyRef(s => s.Supplier)
            .Access.CamelCaseField()
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        Map(s => s.AddressLine1).Column("AddressLine1");
        References(s => s.Supplier).Column("SupplierId").Unique();
    }
}

您的C#类将如下所示：
public class Supplier
{   
    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress { get; set; }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        References(s => s.SupplierAddress)
            .Column("SupplierAddressId")
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");

        Map(s => s.AddressLine1)
            .Column("AddressLine1")
            .Not.Nullable()
            .Length(255);
    }
}

public class Supplier
{   
    private SupplierAddress supplierAddress;

    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress 
    {
        get { return this.supplierAddress; }
        set 
        { 
            this.supplierAddress = value;
            this.supplierAddress.Supplier = this;
        }
    }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }

    public virtual Supplier Supplier { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        HasOne(s => s.SupplierAddress).PropertyRef(s => s.Supplier)
            .Access.CamelCaseField()
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        Map(s => s.AddressLine1).Column("AddressLine1");
        References(s => s.Supplier).Column("SupplierId").Unique();
    }
}

您的映射如下所示：
public class Supplier
{   
    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress { get; set; }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        References(s => s.SupplierAddress)
            .Column("SupplierAddressId")
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");

        Map(s => s.AddressLine1)
            .Column("AddressLine1")
            .Not.Nullable()
            .Length(255);
    }
}

public class Supplier
{   
    private SupplierAddress supplierAddress;

    public virtual int Id { get; set; }

    public virtual SupplierAddress SupplierAddress 
    {
        get { return this.supplierAddress; }
        set 
        { 
            this.supplierAddress = value;
            this.supplierAddress.Supplier = this;
        }
    }

    public virtual string Name { get; set; }
}

public class SupplierAddress
{
    public virtual int Id { get; set; }

    public virtual string AddressLine1 { get; set; }

    public virtual Supplier Supplier { get; set; }
}

public class SupplierMap : ClassMap<Supplier>
{
    public SupplierMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        HasOne(s => s.SupplierAddress).PropertyRef(s => s.Supplier)
            .Access.CamelCaseField()
            .Cascade.All();
    }
}

public class SupplierAddressMap : ClassMap<SupplierAddress>
{
    public SupplierAddressMap()
    {
        Id(s => s.Id).GeneratedBy.Identity().Column("Id");
        Map(s => s.AddressLine1).Column("AddressLine1");
        References(s => s.Supplier).Column("SupplierId").Unique();
    }
}

公共类供应商映射：类映射
{
公共供应商地图（）
{
Id（s=>s.Id）.GeneratedBy.Identity（）列（“Id”）；
HasOne（s=>s.SupplierAddress）.PropertyRef（s=>s.Supplier）
.Access.CamelCaseField（）
.Cascade.All（）；
}
}
公共类SupplierAddressMap:ClassMap
{
公共供应商地址映射（）
{
Id（s=>s.Id）.GeneratedBy.Identity（）列（“Id”）；
映射（s=>s.AddressLine1）。列（“AddressLine1”）；
引用（s=>s.Supplier）.Column（“SupplierId”）.Unique（）；
}
}

请注意，当Supplier.SupplierAddress
为set
时，将设置地址的Supplier
属性
您能显示类的映射吗？尝试在id中设置保护集。它说我应该在SupplierAddress中指定供应商idtable@OlegDobra：SupplierAddress.SupplierId不可为空？@OlegDobra:如果两者都不可为空，NHibernate应该如何插入它们？如果您尝试插入供应商t、 您将失败，因为供应商地址
尚不存在。如果您先插入供应商地址
，则将失败，因为供应商
尚不存在。我建议您删除供应商地址.SupplierId
中的NOTNULL约束，或删除供应商地址
中的引用Supplier
完整。感谢您的建议。在数据库中没有不可为null的约束。但我意外地将其添加到映射中。