C# 无法使用C NHibernate运行TimescaleDB drop_chunks查询_C#_Nhibernate_Timescaledb

C# 无法使用C NHibernate运行TimescaleDB drop_chunks查询

c# nhibernate

C# 无法使用C NHibernate运行TimescaleDB drop_chunks查询,c#,nhibernate,timescaledb,C#,Nhibernate,Timescaledb,这可能是一个初学者的问题因此，我需要以编程方式从PostgreSQL中清除已经确定的时间间隔中的旧数据，例如超过3个月的传感器数据。我已经成功地使用pgAdmin在PostgreSQL中运行了查询，但是通过NHibernate IQuery.ExecuteUpdate命令以编程方式运行，它会给我错误消息 {"could not execute native bulk manipulation query:SELECT drop_chunks('2020-05-15 17:59:30.636':

这可能是一个初学者的问题

因此，我需要以编程方式从PostgreSQL中清除已经确定的时间间隔中的旧数据，例如超过3个月的传感器数据。我已经成功地使用pgAdmin在PostgreSQL中运行了查询，但是通过NHibernate IQuery.ExecuteUpdate命令以编程方式运行，它会给我错误消息

{"could not execute native bulk manipulation query:SELECT drop_chunks('2020-05-15 17:59:30.636'::timestamp, 'attribute_value', 'hm_attr');[SQL: SQL not available]"}

以下是完整的堆栈跟踪：

    at NHibernate.Engine.Query.NativeSQLQueryPlan.PerformExecuteUpdate(QueryParameters queryParameters, ISessionImplementor session)
   at NHibernate.Impl.StatelessSessionImpl.ExecuteNativeUpdate(NativeSQLQuerySpecification nativeSQLQuerySpecification, QueryParameters queryParameters)
   at NHibernate.Impl.SqlQueryImpl.ExecuteUpdate()
   at Platform.Server.Kernel.Persistence.clExecuteQuery.ExecuteSqlCommand(clQueryItem QueryItem, IStatelessSession Session) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\Query\clExecuteQuery.cs:line 184
   at Platform.Server.Kernel.Persistence.PersistenceManager.ExecuteSQL(String SqlCommand, Object[] ParametersValues) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\PersistenceManager.cs:line 362

   at NHibernate.Impl.AbstractQueryImpl.VerifyParameters(Boolean reserveFirstParameter)
   at NHibernate.Impl.SqlQueryImpl.VerifyParameters()
   at NHibernate.Impl.SqlQueryImpl.List()
   at Platform.Server.Kernel.Persistence.clExecuteQuery.ExecuteQueryInternal(Object[] Parameters, IQuery Query) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\Query\clExecuteQuery.cs:line 476
   at Platform.Server.Kernel.Persistence.clExecuteQuery.ExecuteQuery(clQueryItem QueryItem, IStatelessSession Session) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\Query\clExecuteQuery.cs:line 247
   at Platform.Server.Kernel.Persistence.PersistenceManager.SelectSQL(String SQL_Expression, Object[] ParametersValues) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\PersistenceManager.cs:line 674
   at Platform.Server.Kernel.Persistence.PersistenceManager.PurgeTimescaleExpiredChunks(Type EntityType, DateTime PurgeItemsOlderThanThisDate) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\PersistenceManager.cs:line 1098
   at Platform.Server.SystemBase.TemporalData.AttributeValueHandler.PurgeExpiredItems(String ExpiringProperty, DateTime PurgeItemsOlderThanThisDate) in C:\git\smartmine\Server\Platform\SystemBase\TemporalDataManager\AttributeValue\AttributeValueHandler.cs:line 615
   at Platform.Server.SystemBase.Data.clDataManager.ExecutePurge(DateTime PurgeStart) in C:\git\smartmine\Server\Platform\SystemBase\DataManager\clDataManager.cs:line 976

例外情况是：

    The given key was not present in the dictionary.

   at System.ThrowHelper.ThrowKeyNotFoundException()
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at NHibernate.Param.NamedParameterSpecification.SetEffectiveType(QueryParameters queryParameters)
   at NHibernate.Param.ParametersBackTrackExtensions.ResetEffectiveExpectedType(IEnumerable`1 parameterSpecs, QueryParameters queryParameters)
   at NHibernate.Engine.Query.NativeSQLQueryPlan.PerformExecuteUpdate(QueryParameters queryParameters, ISessionImplementor session)

我尝试过的另一种方法是使用返回

Not all named parameters have been set: [':timestamp'] [SELECT drop_chunks('2020-05-15 18:13:08.841'::timestamp, 'attribute_value', 'hm_attr');]

使用以下堆栈跟踪：

    at NHibernate.Engine.Query.NativeSQLQueryPlan.PerformExecuteUpdate(QueryParameters queryParameters, ISessionImplementor session)
   at NHibernate.Impl.StatelessSessionImpl.ExecuteNativeUpdate(NativeSQLQuerySpecification nativeSQLQuerySpecification, QueryParameters queryParameters)
   at NHibernate.Impl.SqlQueryImpl.ExecuteUpdate()
   at Platform.Server.Kernel.Persistence.clExecuteQuery.ExecuteSqlCommand(clQueryItem QueryItem, IStatelessSession Session) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\Query\clExecuteQuery.cs:line 184
   at Platform.Server.Kernel.Persistence.PersistenceManager.ExecuteSQL(String SqlCommand, Object[] ParametersValues) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\PersistenceManager.cs:line 362

   at NHibernate.Impl.AbstractQueryImpl.VerifyParameters(Boolean reserveFirstParameter)
   at NHibernate.Impl.SqlQueryImpl.VerifyParameters()
   at NHibernate.Impl.SqlQueryImpl.List()
   at Platform.Server.Kernel.Persistence.clExecuteQuery.ExecuteQueryInternal(Object[] Parameters, IQuery Query) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\Query\clExecuteQuery.cs:line 476
   at Platform.Server.Kernel.Persistence.clExecuteQuery.ExecuteQuery(clQueryItem QueryItem, IStatelessSession Session) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\Query\clExecuteQuery.cs:line 247
   at Platform.Server.Kernel.Persistence.PersistenceManager.SelectSQL(String SQL_Expression, Object[] ParametersValues) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\PersistenceManager.cs:line 674
   at Platform.Server.Kernel.Persistence.PersistenceManager.PurgeTimescaleExpiredChunks(Type EntityType, DateTime PurgeItemsOlderThanThisDate) in C:\git\smartmine\Server\Platform\Kernel\PersistenceManager\PersistenceManager.cs:line 1098
   at Platform.Server.SystemBase.TemporalData.AttributeValueHandler.PurgeExpiredItems(String ExpiringProperty, DateTime PurgeItemsOlderThanThisDate) in C:\git\smartmine\Server\Platform\SystemBase\TemporalDataManager\AttributeValue\AttributeValueHandler.cs:line 615
   at Platform.Server.SystemBase.Data.clDataManager.ExecutePurge(DateTime PurgeStart) in C:\git\smartmine\Server\Platform\SystemBase\DataManager\clDataManager.cs:line 976

TimescaleDB API版本：0.9.2文档说，这显然不包括从NHibernate运行东西。我很难找到关于这个查询API的NHibernate文档，因为我所找到的都是类似于这里的SELECT*标准可用性

同样，这可能是一个初学者的问题，如果我误解了什么，请原谅。非常感谢您的帮助，提前谢谢

结果是，我预料到了这个过程中的日期时间转换问题。基本上，我遇到了TimescaleDB错误

Cannot call drop_chunks with a date on hypertables with a time type of: timestamp without time zone

因为，正如错误所述，我的基本hypertable的日期类型实际上是

timestamp without timezone

不知怎的，正因为如此，在我把日期定为

'2020-05-15 17:59:30.636'::timestamp

我已经预料到了日期转换的错误，并通过添加.ToString调用和其他过度工程化的过程弄乱了格式

通过简单地将原始日期作为参数传递就解决了这个问题，所以代码看起来很简单

SELECT drop_chunks(:p0, :p1, :p2)

其中：p0是一个DateTime变量，：p1是表名，：p2是模式名，当然区分大小写