c# - 事件记录/NHibernate : Update error on Query

Question

我的网站上有一个搜索功能，但有时会失败。它是用 C#/ASP.NET/WebForms 构建的，并使用 ActiveRecord。

基本上，当我从我的数据库中的 VIEW 返回太多记录时，它会接缝，我会收到更新错误。

string query = "s";
Order[] orders = new order[] { Order.Asc("LastName") };
List<ICriterion> crit = new List<ICriterion>();
Crit.Add(Expression.Sql(String.Format("LastName" LIKE '%{0}%' OR FirstName LIKE '%{0}%'", query)));
var rv = ActiveRecordBase.FindAll(typeof(vMyView), orders, crit.ToArray())

当使用“s”作为要搜索的查询(我会得到很多结果)时，我的代码的上述部分在 FindAll 命令上失败了。但是使用“x”作为查询它就像一个魅力。

我得到的错误是:

View or function 'vAllowedVessels' is not updatable because the modification affects multiple base tables. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Data.SqlClient.SqlException: View or function 'vAllowedVessels' is not updatable because the modification affects multiple base tables.

Source Error: 

Line 74:             List<ICriterion> crit = new List<ICriterion>();
Line 75:             Crit.Add(Expression.Sql(String.Format("LastName" LIKE '%{0}%' OR FirstName LIKE '%{0}%'", query)));
Line 75:             var rv = ActiveRecordBase.FindAll(typeof(vMyView), orders, crit.ToArray()) <--- This is highlighted in red!

Stack Trace:
[GenericADOException: could not update: [Ovf.Model.vAllowedVessels#3843][SQL: UPDATE vAllowedVessels SET FixtureId = ?, ContractDate = ?, No = ?, ContractForm = ?, VesselName = ?, Status = ?, CreatedDate = ?, Buyer = ?, BuyerName = ?, BuyerShortName = ?, BuyPrincipal = ?, BuyPrincipalName = ?, Seller = ?, SellerName = ?, SelPrincipal = ?, SelPrincipalName = ?, Operator = ?, Broker = ?, UsrCode = ? WHERE VesselFolderId = ?]]
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) +2474
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) +335
NHibernate.Persister.Entity.AbstractEntityPersister.Update(Object id, Object[] fields, Int32[] dirtyFields, Boolean hasDirtyCollection, Object[] oldFields, Object oldVersion, Object obj, Object rowId, ISessionImplementor session) +1898
NHibernate.Action.EntityUpdateAction.Execute() +764
NHibernate.Engine.ActionQueue.Execute(IExecutable executable) +48
NHibernate.Engine.ActionQueue.ExecuteActions(IList list) +128
NHibernate.Engine.ActionQueue.ExecuteActions() +50
NHibernate.Event.Default.AbstractFlushingEventListener.PerformExecutions(IEventSource session) +215
NHibernate.Event.Default.DefaultAutoFlushEventListener.OnAutoFlush(AutoFlushEvent event) +225
NHibernate.Impl.SessionImpl.AutoFlushIfRequired(ISet`1 querySpaces) +288
NHibernate.Impl.SessionImpl.List(CriteriaImpl criteria, IList results) +524
NHibernate.Impl.CriteriaImpl.List(IList results) +76
NHibernate.Impl.CriteriaImpl.List() +71
Castle.ActiveRecord.ActiveRecordBase.FindAll(Type targetType, Order[] orders, ICriterion[] criteria) in c:\TeamCity\buildAgent\work\e41ee5ead2eba140\src\Castle.ActiveRecord\Framework\ActiveRecordBase.cs:1034

[ActiveRecordException: Could not perform FindAll for vAllowedVessels]
Castle.ActiveRecord.ActiveRecordBase.FindAll(Type targetType, Order[] orders, ICriterion[] criteria) in c:\TeamCity\buildAgent\work\e41ee5ead2eba140\src\Castle.ActiveRecord\Framework\ActiveRecordBase.cs:1046
Ovf.Model.vAllowedVessels.SearchByType(String query, String typename, String usrCode) in g:\Dev\2012\OnTrack\model\Profile\vAllowedVessels.cs:76
Search_Default.BindVesselFolders() in g:\Dev\2012\OnTrack\webapp\Search\Default.aspx.cs:155
Search_Default.ChangeStatus(Object sender, EventArgs e) in g:\Dev\2012\OnTrack\webapp\Search\Default.aspx.cs:145
System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(EventArgs e) +116
System.Web.UI.WebControls.DropDownList.RaisePostDataChangedEvent() +133
System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() +13
System.Web.UI.Page.RaiseChangedEvents() +132
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1644

应该注意的是，我不想更新任何东西 - 只是查询我的 VIEW。

Answer 1

显然，您的某些数据对 NH 来说似乎是脏数据，需要保存，即使您没有进行任何更改也是如此。这可能来自正在转换值的属性 getter 或自定义用户类型，这样它们就不再匹配来自数据库的值。例如 - 像这样的代码可能会有问题:

private string _lastName;
public virtual string LastName
{
    get { return _lastName.Trim(); }
    set { _lastName = value; }
}

即使您从未接触过 setter，该属性的值看起来仍然发生了变化。看看您是否可以删除这些类型的转换 - 以另一种方式处理它们。

这是另一种可能更简单的处理方法:由于您无法通过此 SQL View 保存更改，因此您应该将 mutable="false" 添加到类映射中。查看documentation :

Changes to immutable classes, mutable="false", will not be persisted.

在 Fluent NHibernate 中，您使用 ReadOnly() 方法来控制此 mutable 标志。