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https://stackoverflow.com/questions/39837911/fluent-nhibernate-dialect-does-not-support-dbtype-xml-sqlite
I have a custom NHibernate XMLtype (Converts POCO to XML on the fly) so i can save objects in the DB. This works with SQL Server 2014 without any issues. However, when trying to run our unit tests which use SQLite, I'm getting loads of errors due to this. System.ArgumentException: Dialect does not support DbType.Xml Parameter name: typecode.
https://bartwullems.blogspot.com/2019/03/nhibernatepostgresql-dialect-does-not.html
Mar 20, 2019 · Dialect does not support DbType.Guid Parameter name: typecode. at NHibernate.Dialect.TypeNames.Get(DbType typecode) at NHibernate.Mapping.Table.SqlTemporaryTableCreateString(Dialect dialect, IMapping mapping) at NHibernate.Mapping.PersistentClass.PrepareTemporaryTables(IMapping mapping, Dialect dialect) ... NHibernate–PostgreSQL - Dialect ...Author: Bart Wullems
http://www.delphigroups.info/2/58/276356.html
SQL Dialect 1 does not support reference to DATE datatype. 3. Client SQL 1 dialect does not support ref to DATE datatype. 4. Client SQL dialect 1 does not support referenc to 64-bit numeric Datatype. 5. Delphi and BDE5.2: Client SQL dialect 1 does not support reference to 64 bit numeric datatype. 6. SQL Explorer can not support Dialect 3. 7.
https://nhibernate.jira.com/browse/NH-1111
PostgreSQL 8.3 dialect with Guid type support. Description. Next version of PostgreSQL, 8.3, will support DbType.Guid. This new dialect add this functionality. It was not tested because Npgsql currently doesn't recognise DbType.Guid. But, except a big surprise, this should work like a charm.
http://jameskovacs.com/2011/01/26/datetime-support-in-nhibernate/
Date/Time Support in NHibernate – James Kovacs takes a look at how NHibernate handles the plethora of date and time types that are available in databases and frameworks, and explores some of the issues with working with local vs UTC time. Source is available for the samples.
https://docs.microsoft.com/en-us/sql/relational-databases/native-client-ole-db-data-types/data-type-mapping-in-rowsets-and-parameters
dbtype_xml The SQL Server Native Client OLE DB provider supports consumer-requested data conversions as shown in the illustration. The sql_variant objects can hold data of any SQL Server data type except text, ntext, image, varchar(max), nvarchar(max), varbinary(max), xml, timestamp, and Microsoft .NET Framework common language runtime (CLR ...
https://docs.oracle.com/database/121/ODPNT/featXML.htm
However, it does interoperate with .NET Framework's XML classes, support XQuery, and support SQL to XML implicit conversion between Oracle Database to .NET as string or LOB client-side data types. ODP.NET, Managed Driver follows XPath 1.0 specification and hence it does not support default XML …
https://github.com/nhibernate/nhibernate-core/blob/master/src/NHibernate/Dialect/Dialect.cs
get { throw new MappingException (" Dialect does not support identity key generation "); } /// < summary > /// Set this to false if no table-level primary key constraint should be generated when an identity column has been specified for the table.
https://docs.microsoft.com/en-us/sql/relational-databases/native-client/features/using-xml-data-types
DBTYPE_IUNKNOWN is a supported binding (as shown in the above table), but there are no conversions between DBTYPE_XML and DBTYPE_IUNKNOWN. DBTYPE_IUNKNOWN may not be used with DBTYPE_BYREF. OLE DB Rowset Additions and Changes. SQL Server Native Client adds new values or changes to many of the core OLE DB schema rowsets.
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