nhibernate审核与更新的事件 [英] nhibernate auditing with events on update

问题描述

以下代码适用于插入，但更新修饰符从未设置，任何想法为什么？

The following code works on insert but on update modifier is never set, any ideas why?

正在运行用于预更新的代码，并将状态和实体值正确设置为所需值。但是在查看生成的sql nhibernate时，不包括更新查询中的字段。

The code for pre-update is being run and correctly sets the state and entity values to the desired value. However when viewing the generated sql nhibernate does not include the field in the update query.

/// <summary> Updates auditable objects </summary>
public class AuditEventListener : IPreInsertEventListener, IPreUpdateEventListener
{
    private ISecurityManager securityManager;

    public bool OnPreInsert( PreInsertEvent args )
    {
        var auditable = args.Entity as IAuditable;
        if (auditable != null) {

            Set( x => auditable.Creator, args.Persister, auditable, args.State, SecurityManager.Identity );
            Set( x => auditable.DateAdded, args.Persister, auditable, args.State, Clock.Now );
        }
        return false;
    }

    public bool OnPreUpdate( PreUpdateEvent args )
    {
        var auditable = args.Entity as IAuditable;
        if (auditable != null) {

            Set( x => auditable.Modifier, args.Persister, auditable, args.State, SecurityManager.Identity );
            //Set( x => auditable.DateModified, args.Persister, auditable, args.State, Clock.Now );
        }
        return false;
    }


    /// <summary> Type safe method to update sate and entity </summary>
    private void Set<T, U>( Expression<Func<U, T>> expression, IEntityPersister persister, U instance, object[] state, T value )
    {
        var member = expression.Body as MemberExpression;
        if (member != null) {

            var index = Array.IndexOf( persister.PropertyNames, member.Member.Name );
            if (index == -1) {
                return;
            }
            state[index] = value;

            var property = (member.Member as PropertyInfo);
            if (property != null) {
                property.SetValue( instance, value, null );
            }
        }
    }

    ISecurityManager SecurityManager
    {
        get { /* From IoC */ }
    }

}

推荐答案

编辑1：答案已经改善了

编辑2：看来，问题的真正原因是动态更新设置为true为这里找到这个解决方案仍然适用于我。

Edit 1: This answer has been improved
Edit 2: It appears the the real cuase of the problem is dynamic-update set to true as found here however this solution still works for me.

你在更早的OnFlushDirty函数中更新它们。

The changes get saved when you update them in the OnFlushDirty function which is called earlier.

public override bool OnFlushDirty( object entity, object id, object[] currentState, object[] previousState, string[] propertyNames, NHibernate.Type.IType[] types )
{
    bool result = false;

    if (entity is IAuditable) {
        var auditable = (IAuditable)entity;

        Set( x => auditable.Modifier, propertyNames, auditable, currentState, SecurityManager.Identity );
        //Set( x => auditable.DateModified, args.Persister, auditable, args.State, TwentyClock.Now );

        result = true;
    }

    return result;
}

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