Question

我是NHibernate的新手，我希望我能找到一些帮助来追踪我在尝试对谓词使用DateTime比较时遇到的转换错误的来源。

return _session.QueryOver<ShipmentSegment>()
                .Where(ss => ss.SegmentOrigin == selOrig)
                // Whenever I add the predicate for the SegmentDate below
                // I receive a conversion error
                .And(ss => ss.SegmentDate == selDate)
                .List<ShipmentSegment>();

异常

NHibernate.Exceptions.GenericADOException was unhandled by user code
  Message=could not execute query
[ SELECT this_.ajpro# as ajpro1_28_0_, this_.ajleg# as ajleg2_28_0_, this_.ajpu# as ajpu3_28_0_, this_.ajlorig as ajlorig28_0_, this_.ajldest as ajldest28_0_, this_.segdate as segdate28_0_, this_.ajldptwin as ajldptwin28_0_, this_.ajlfrtype as ajlfrtype28_0_, this_.ajlfrdest as ajlfrdest28_0_, this_.ajtpmfst# as ajtpmfst10_28_0_, this_.ajspplan as ajspplan28_0_, this_.ajhload as ajhload28_0_ FROM go52cst.tstshprte this_ WHERE this_.ajlorig = @p0 and this_.segdate = @p1 ]
  Name:cp0 - Value:WIC  Name:cp1 - Value:3/28/2012 12:00:00 AM

内部异常

Message=A conversion error occurred.
       Source=IBM.Data.DB2.iSeries
       ErrorCode=-2147467259
       MessageCode=111
       MessageDetails=Parameter: 2.
       SqlState=""
       StackTrace:


 - at IBM.Data.DB2.iSeries.iDB2Exception.throwDcException(MpDcErrorInfo
 mpEI, MPConnection conn)
 - at IBM.Data.DB2.iSeries.iDB2Command.openCursor()
 - at IBM.Data.DB2.iSeries.iDB2Command.ExecuteDbDataReader(CommandBehavior
 behavior)
 - at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader()
 - at NHibernate.AdoNet.AbstractBatcher.ExecuteReader(IDbCommand cmd)
 - at NHibernate.Loader.Loader.GetResultSet(IDbCommand st, Boolean autoDiscoverTypes, Boolean callable, RowSelection selection,
   ISessionImplementor session)
 - at NHibernate.Loader.Loader.DoQuery(ISessionImplementor session, QueryParameters queryParameters, Boolean returnProxies)
 - at NHibernate.Loader.Loader.DoQueryAndInitializeNonLazyCollections(ISessionImplementor
   session, QueryParameters queryParameters, Boolean returnProxies)
 - at NHibernate.Loader.Loader.DoList(ISessionImplementor session, QueryParameters queryParameters)

我感谢任何可以帮助我指明正确方向的事情。

Answer 1

我对此特定iSeries异常的体验来自于我为存储过程类型ADO命令的ADO.NET命令参数列表创建参数（iDB2TypeParameter）。我必须明确告诉使用哪种iDB2DbType：iDB2DbType.Date，iDB2DbType.Time或iDB2DbType.TimeStamp。从.NET System.DateTime类型创建参数时，iSeries ADO提供程序可能无法知道要使用的三种类型中的哪一种。

new iDB2Parameter(parameterName, iDB2DbType.Date){ Value = myValue };
new iDB2Parameter(parameterName, iDB2DbType.Time){ Value = myValue };
new iDB2Parameter(parameterName, iDB2DbType.TimeStamp){ Value = myValue };

我意识到您不是像这个示例那样手动创建参数，而是使用NHibernate。所以，我会确保NHibernate的DB2 / iSeries的LINQ提供程序知道这一点。这与NHibernate毫无关系，我发现几乎不可能为DB2 / iSeries找到好的，可靠的ORM。

DB2日期类型上的NHibernate QueryOver转换错误

1 个答案: