Question

尝试使用nhibernate更新对象时出现以下错误。我试图更新一个外键字段。有什么想法我可能会收到这个错误？我无法从错误中弄明白，我的log4net日志也没有提供任何提示。

由于

    System.IndexOutOfRangeException was unhandled by user code
  Message="Parameter index is out of range."
  Source="MySql.Data"
  StackTrace:
       at MySql.Data.MySqlClient.MySqlParameterCollection.CheckIndex(Int32 index)
       at MySql.Data.MySqlClient.MySqlParameterCollection.GetParameter(Int32 index)
       at System.Data.Common.DbParameterCollection.System.Collections.IList.get_Item(Int32 index)
       at NHibernate.Type.Int32Type.Set(IDbCommand rs, Object value, Int32 index)
       at NHibernate.Type.NullableType.NullSafeSet(IDbCommand cmd, Object value, Int32 index)
       at NHibernate.Type.NullableType.NullSafeSet(IDbCommand st, Object value, Int32 index, ISessionImplementor session)
       at NHibernate.Persister.Entity.AbstractEntityPersister.Dehydrate(Object id, Object[] fields, Object rowId, Boolean[] includeProperty, Boolean[][] includeColumns, Int32 table, IDbCommand statement, ISessionImplementor session, Int32 index)
       at NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object id, Object[] fields, Object[] oldFields, Object rowId, Boolean[] includeProperty, Int32 j, Object oldVersion, Object obj, SqlCommandInfo sql, ISessionImplementor session)
       at NHibernate.Persister.Entity.AbstractEntityPersister.UpdateOrInsert(Object id, Object[] fields, Object[] oldFields, Object rowId, Boolean[] includeProperty, Int32 j, Object oldVersion, Object obj, SqlCommandInfo sql, ISessionImplementor session)
       at NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object id, Object[] fields, Int32[] dirtyFields, Boolean hasDirtyCollection, Object[] oldFields, Object oldVersion, Object obj, Object rowId, ISessionImplementor session)
       at NHibernate.Action.EntityUpdateAction.Execute()
       at NHibernate.Engine.ActionQueue.Execute(IExecutable executable)
       at NHibernate.Engine.ActionQueue.ExecuteActions(IList list)
       at NHibernate.Engine.ActionQueue.ExecuteActions()
       at NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource session)
       at NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent event)
       at NHibernate.Impl.SessionImpl.Flush()
       at NHibernate.Transaction.AdoTransaction.Commit()
       at DataAccessLayer.NHibernateDataProvider.UpdateItem_temp(items_temp item_temp) in C:\Documents and Settings\user\My Documents\Visual Studio 2008\Projects\mySolution\DataAccessLayer\NHibernateDataProvider.cs:line 225
       at InventoryDataClean.Controllers.ImportController.Edit(Int32 id, FormCollection formValues) in C:\Documents and Settings\user\My Documents\Visual Studio 2008\Projects\mySolution\InventoryDataClean\Controllers\ImportController.cs:line 101
       at lambda_method(ExecutionScope , ControllerBase , Object[] )
       at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
       at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
       at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClassa.<InvokeActionMethodWithFilters>b__7()
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
  InnerException:

这是我的项目映射 -

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DataTransfer" namespace="DataTransfer">
  <class name="DataTransfer.items_temp, DataTransfer" table="items_temp">
    <id name="id" unsaved-value="any" >
      <generator class="assigned"/>
    </id>
    <property name="assetid"/>
    <property name="description"/>
    <property name="caretaker"/>
    <property name="category"/>
    <property name="status"  />
    <property name="vendor" />

    <many-to-one name="statusName" class="status" column="status" />
  </class>
</hibernate-mapping>

这是我的状态映射 -

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="DataTransfer" namespace="DataTransfer">
  <class name="DataTransfer.status, DataTransfer" table="status">
    <id name="id" unsaved-value="0">
      <generator class="assigned"/>
    </id>
    <property name="name"/>
    <property name="def"/>

  </class>
</hibernate-mapping>

这是我的更新功能 -

public void UpdateItem_temp(items_temp item_temp)
        {
            ITransaction t = _session.BeginTransaction();
            try
            {
                _session.SaveOrUpdate(item_temp);
                t.Commit();
            }
            catch (Exception)
            {
                t.Rollback();
                throw;
            }
            finally
            {
                t.Dispose();
            }
        }

Answer 1

您已将items_temp.status映射两次 - 一次为property，另一次为many-to-one reference。

<property name="status"  />
<many-to-one name="statusName" class="status" column="status" />

如果要执行此操作，则需要更改其中一个的列名。

Answer 2

试试这个

many-to-one name="statusName" class="status" column="status" insert="false" update="false"

或按代码映射

ManyToOne<status>(x => x.statusName, map => {map.Column("status"); map.Update(false); map.Insert(false);});

Answer 3

当我错误地在我的hibernate映射中有两个列名相同时，我也得到了这个。

像傻瓜一样：

<property name="OrderId" column="order_id" />
<property name="OnlineOrderId" column="order_id" />

Answer 4

我在尝试保存或更新映射与表之间不匹配的实体之前遇到过这样的异常;特别是当列名拼写错误或列仅存在于两个位置之一时。

Answer 5

这可能是由于NHibernate尝试将数据保存到数据库的顺序。我怀疑这是因为它试图在外键输入在引用表中之前在主表中设置外键id。如果您发布映射和数据模式，以及分配和保存属性的代码，将会有所帮助

参数索引超出范围

5 个答案: