I am trying to switch a table from being a many-to-one mapping to being many-to-many with an intermediate mapping table. However, when I switched it over and tried to do a query on it with NHibernate, it's giving me this error: "Interceptor.OnPrepareStatement(SqlString) returned null or empty SqlString."
My query was originally something more complex, but I switched it to a basic fetch all and I'm still having the problem:
Session.QueryOver<T>().Future();
It would seem to either be a problem in my model mapping files or something in my database.
Here are my model mappings:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="GBI.Core" namespace="GBI.Core.Models">
<class name="Market" table="gbi_Market">
<id name="Id" column="MarketId">
<generator class="identity" />
</id>
<property name="Name" />
<property name="Url" />
<property name="Description" type="StringClob" />
<property name="Rating" />
<property name="RatingComment" />
<property name="RatingCommentedOn" />
<many-to-one name="RatingCommentedBy" column="RatingCommentedBy" lazy="proxy"></many-to-one>
<property name="ImageFilename" />
<property name="CreatedOn" />
<property name="ModifiedOn" />
<property name="IsDeleted" />
<many-to-one name="CreatedBy" column="CreatedBy" lazy="proxy"></many-to-one>
<many-to-one name="ModifiedBy" column="ModifiedBy" lazy="proxy"></many-to-one>
<set name="Content" where="IsDeleted=0 and ParentContentId is NULL" order-by="
Ordering asc, CreatedOn asc, Name asc" lazy="extra">
<key column="MarketId" />
<one-to-many class="MarketContent" />
</set>
<set name="FastFacts" where="IsDeleted=0" order-by="
Ordering asc, CreatedOn asc, Name asc" lazy="extra">
<key column="MarketId" />
<one-to-many class="MarketFastFact" />
</set>
<set name="NewsItems" table="gbi_NewsItem_Market_Map" lazy="true">
<key column="MarketId" />
<many-to-many class="NewsItem" fetch="join" column="NewsItemId" where="IsDeleted=0"/>
</set>
<!--<set name="MarketUpdates" table="gbi_Market_MarketUpdate_Map" lazy="extra">
<key column="MarketId" />
<many-to-many class="MarketUpdate" fetch="join" column="MarketUpdateId" where="IsDeleted=0" order-by="CreatedOn desc" />
</set>-->
<set name="Documents" table="gbi_Market_Document_Map" lazy="true">
<key column="MarketId" />
<many-to-many class="Document" fetch="join" column="DocumentId" where="IsDeleted=0"/>
</set>
</class>
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="GBI.Core" namespace="GBI.Core.Models">
<class name="MarketUpdate" table="gbi_MarketUpdate">
<id name="Id" column="MarketUpdateId">
<generator class="identity" />
</id>
<property name="Description" />
<property name="CreatedOn" />
<property name="ModifiedOn" />
<property name="IsDeleted" />
<!--<many-to-one name="Market" column="MarketId" lazy="proxy"></many-to-one>-->
<set name="Comments" where="IsDeleted=0" order-by="CreatedOn desc" lazy="extra">
<key column="MarketUpdateId" />
<one-to-many class="MarketUpdateComment" />
</set>
<many-to-one name="CreatedBy" column="CreatedBy" lazy="proxy"></many-to-one>
<many-to-one name="ModifiedBy" column="ModifiedBy" lazy="proxy"></many-to-one>
</class>
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="GBI.Core" namespace="GBI.Core.Models">
<class name="MarketUpdateMarketMap" table="gbi_Market_MarketUpdate_Map">
<id name="Id" column="MarketUpdateMarketMapId">
<generator class="identity" />
</id>
<property name="CreatedOn" />
<property name="ModifiedOn" />
<property name="IsDeleted" />
<many-to-one name="CreatedBy" column="CreatedBy" lazy="proxy"></many-to-one>
<many-to-one name="ModifiedBy" column="ModifiedBy" lazy="proxy"></many-to-one>
<many-to-one name="MarketUpdate" column="MarketUpdateId" lazy="proxy"></many-to-one>
<many-to-one name="Market" column="MarketId" lazy="proxy"></many-to-one>
</class>
As I mentioned, MarketUpdate was originally a many-to-one with Market (MarketId column is still in there, but I'm ignoring it. Could this be a problem?). But I've added in the Market_MarketUpdate_Map table to make it a many-to-many.
I'm running in circles trying to figure out what this could be. I couldn't find any reference to this error when searching. And it doesn't provide much detail.
Using:
NHibernate 2.2
.NET 4.0
SQL Server 2005
