Nhibernate非空属性引用空值或瞬态值Tec.Core.Model.Budget.oInvestmentCode。

Question

早上好,

我对NHibernate非常陌生。我想在我的新项目中使用它，但是我遇到了一个外键引用的问题。我不知道为什么会发生这个问题。

显示的错误消息是：not-null property references a null or transient value Tec.Core.Model.Budget.oInvestmentType

下面是我的表模式：

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这是我的映射文件

机场

Airport.hbm.xml

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">   
<class name="Tec.Core.Model.Airport, Tec.Core" table="tblAirport" lazy="false">
    <id name="ID" column="AirportID" unsaved-value="0">
      <generator class="identity" />
    </id>
    <property name="AirportCode" column="AirportCode" />
    <property name="AirportFullName" column="AirportFullName" />

    <bag name="Budgets" table="tblBudget" inverse="true" cascade="save-update">
      <key column="AirportID" />
      <one-to-many class="Tec.Core.Model.Budget, Tec.Core" />
    </bag>
</class> 
</hibernate-mapping>

Airports.cs

public class Airport:Entity<int> 
{
    private string _airportCode="";
    private string _airportFullName="";
    private IList<Budget> _airportBudgets = new List<Budget>();

    private Airport() { }
    public Airport(string AirportCode, string AirportFullName) {
        this._airportCode = AirportCode;
        this._airportFullName = AirportFullName; 
    }                
     public  string AirportCode  {
        get { return _airportCode; }
        set { _airportCode = value; }
    }
    public  string AirportFullName {
        get { return _airportFullName; }
        set { _airportFullName = value; }
    }
    public IList<Budget> Budgets {
        get { return new List<Budget>(_airportBudgets).AsReadOnly(); }
        protected set { _airportBudgets = value; }
    }
    public void AddBudget(Budget air_budget){
        if (air_budget != null && !_airportBudgets.Contains(air_budget)){
            air_budget.oAirport = this; 
            _airportBudgets.Add(air_budget);
        }
    }

    public override int GetHashCode(){
        return (GetType().FullName + "|" + _airportCode.GetHashCode()).GetHashCode();
    }

}

InvestmentCode

InvestmentCode.hbm.xml

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">   
<class name="Tec.Core.Model.InvestmentCode, Tec.Core" table="tblInvestmentCode" lazy="false">
    <id name="ID" column="InvestmentCodeID" unsaved-value="0">
      <generator class="identity" />
    </id>
    <property name="InvCode" column="InvestmentCode" />
    <property name="InvCodeNote" column="InvestmentCodeNote" />

    <bag name="Budgets" table="tblBudget" inverse="true" cascade="save-update">
      <key column="InvestmentCodeID" />
      <one-to-many class="Tec.Core.Model.Budget, Tec.Core" />
    </bag>
  </class> 
</hibernate-mapping>

InvestmentCode.cs

公共类InvestmentCode:实体{ 私有字符串_investmentCode=“；私有字符串_investmentCodeNote=”；私有IList _lstinvestmentCodeBudgets =新列表()；私有InvestmentCode() {} public InvestmentCode(string investmentCode，string InvestmentCodeNote) { this._investmentCode = investmentCode；}公共字符串InvCodeNote { get {返回_investmentCodeNote；} set { _investmentCodeNote = value；}}公共IList预算{ get {返回新列表( _lstinvestmentCodeBudgets ).AsReadOnly()；}受保护的集合{_lstinvestmentCodeBudgets=值；}公开无效!_lstinvestmentCodeBudgets.Contains(investment_code_budget)){ AddBudget(预算investment_code_budget) { if (investment_code_budget != null &investment_code_budget investment_code_budget.oInvestmentCode = this；_lstinvestmentCodeBudgets.Add(investment_code_budget)；)}}公共覆盖int GetHashCode(){ GetType().FullName+“AC.26”+_investmentCode.GetHashCode().GetHashCode()；}

InvestmentType

InvestmentType.hbm.xml

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">   
<class name="Tec.Core.Model.InvestmentType, Tec.Core" table="tblInvestmentType" lazy="false">
    <id name="ID" column="InvestmentTypeID" unsaved-value="0">
      <generator class="identity" />
    </id>
    <property name="InvestmentTypeNote" column="InvestmentTypeNote" />    

    <bag name="Budgets" table="tblBudget" inverse="true"  cascade="save-update">
      <key column="InvestmentTypeID" />
      <one-to-many class="Tec.Core.Model.Budget, Tec.Core" />
    </bag>
</class> 
</hibernate-mapping>

InvestmentType.cs

公共类InvestmentType:实体{ 私有字符串_investmentTypeNote=“；私有IList _lstInvestmentTypeBudgets =新列表()；私有InvestmentType() {} public InvestmentType(string InvestmentTypeNote){ this._investmentTypeNote = InvestmentTypeNote；}公共字符串InvestmentTypeNote { get {返回_investmentTypeNote；} set { _investmentTypeNote = value；} public IList预算{ get {返回新列表(_lstInvestmentTypeBudgets).AsReadOnly()；}受保护的集合{ _lstInvestmentTypeBudgets =值；}公共无效AddBudget(预算investment_type_budget) { if (investment_type_budget != null && _lstInvestmentTypeBudgets investment_type_budget.oInvestmentType = this；_lstInvestmentTypeBudgets.Add(investment_type_budget)；)}}公共覆盖int GetHashCode(){ GetHashCode (GetType().FullName +“AC.26”+GetType})}

预算

Budget.hbm.xml

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">   
<class name="Tec.Core.Model.Budget, Tec.Core" table="tblBudget" lazy="false">
    <id name="ID" column="BudgetID" unsaved-value="0">
      <generator class="identity" />
    </id>
    <property name="BudgetAmount" column="BudgetAmount" />
    <property name="BudgetYear" column="BudgetYear" />

    <many-to-one name="oAirport" column="AirportID"
      class="Tec.Core.Model.Airport, Tec.Core" not-null="true" />
    <many-to-one name="oInvestmentCode" column="InvestmentCodeID"
      class="Tec.Core.Model.InvestmentCode, Tec.Core" not-null="true" />
    <many-to-one name="oInvestmentType" column="InvestmentTypeID"
      class="Tec.Core.Model.InvestmentType, Tec.Core" not-null="true" />  
</class> 
</hibernate-mapping>

Budget.cs

public class Budget:Entity<long> { private float \_budgetAmount; private int \_budgetYear; private InvestmentType \_investmentType; private InvestmentCode \_investmentCode; private Airport \_airport; public Budget() { } public float BudgetAmount { get{return \_budgetAmount; } set{\_budgetAmount = value;} } public int BudgetYear { get{return \_budgetYear; } set{\_budgetYear = value;} } public Airport oAirport{ get{return \_airport; } set{\_airport = value;} } public InvestmentType oInvestmentType{ get{return \_investmentType; } set{\_investmentType = value;} } public InvestmentCode oInvestmentCode { get{return \_investmentCode ; } set{\_investmentCode = value;} } public override int GetHashCode(){ return (GetType().FullName + "|" + \_airport.GetHashCode() +"|"+ \_investmentCode.GetHashCode()+"|"+ \_investmentType.GetHashCode()).GetHashCode(); } }

在我的Default.asp.cs里

我有以下代码：

        Airport objA = new Airport("NA", "New Airport")
        InvestmentCode objIC = new InvestmentCode("1000", "ABCD");
        InvestmentType objIT = new InvestmentType("Capex");

        Budget objBg = new Budget();
        objBg.oAirport = objA;
        objBg.oInvestmentCode = objIC;
        objBg.oInvestmentType = objIT;
        objBg.BudgetAmount = 10000;
        objBg.BudgetYear = 2014;

        objA.AddBudget(objBg);
        AirportDao.SaveOrUpdate(objA);

        objIC.AddBudget(objBg);
        daoFactory.GetInvestmentCodeDao().Save(objIC);  //Error occur here not-null property references a null or transient value Tec.Core.Model.Budget.oInvestmentType


        objIT.AddBudget(objBg);            
        daoFactory.GetInvestmentTypeDao().Save(objIT);     

Answer 1

我不会把我的生命押在上面..。但我要说你的问题是：

public IList<Budget> Budgets {
    get { return new List<Budget>(_lstinvestmentCodeBudgets).AsReadOnly(); }
    protected set { _lstinvestmentCodeBudgets = value; }
}

此代码按以下顺序调用：

objA.AddBudget(objBg);
AirportDao.SaveOrUpdate(objA);

objA被持久化。objBg也是级联和持久化的。这意味着NHiberante会跟踪对NHiberante的引用。

那你就把这叫做：

objIC.AddBudget(objBg);

按预期将预算添加到列表中。我们把这份名单叫做“名单A”。

然后你去打电话给保存：

daoFactory.GetInvestmentCodeDao().Save(objIC);

当NHibernate开始从您的实体读取值时。这是你的灵感来源：

get { return new List<Budget>(_lstInvestmentTypeBudgets).AsReadOnly(); }

你已经把你的财产包装在一个新的列表中了。所以现在，这是“名单B”。不是NHibernate所期望的“列表A”。“名单B”没有被坚持。所以NHibernate说：“等等.你想坚持我在更新中没有跟踪的东西”。

尝试将您的getter更改为：

get { return _lstInvestmentTypeBudgets; }

..and看看这是否有效。应该..。因为你要返回相同的实例。

Answer 2

地图需要稍加修正。预算是一个与机场、投资和InvestmentCode有关的实体。预算不能像子类一样添加到这里的其他类中，因为这里没有任何人与许多类的关系。因此，请从这三个类中删除addBudget方法，并将以下方法添加到Budget类-> AddAirport, AddInvestmentCode, AddInvestmentType中。Update:通过从机场、投资类型和代码中移除指向预算类的袋子，从而相应地更正映射