Testing NHibernate with SQLite "No Such Table" - schema is generated - unit-testing

Question

I'm trying to use an in-memory SQLite database to test my data layer which is provided by NHibernate.
I've read a load of blogs and articles about getting this setup but I'm now very confused as to why it isn't working.
The problem - when I run a unit test I get the error 'no such table: Student'. The articles I've read suggest this is because the schema isn't getting generated, or, the connection is being closed between my SchemaExport and query. I've checked everywhere I can think of and can't see how either of these scenarios are occuring.
My test output log looks like this:
OPEN CONNECTION
drop table if exists "Student"
drop table if exists "Tutor"
create table "Student" (
ID integer,
Name TEXT,
DoB DATETIME,
TutorId INTEGER,
primary key (ID)
)
create table "Tutor" (
ID integer,
Name TEXT,
primary key (ID)
)
NHibernate: INSERT INTO "Student" (Name, DoB, TutorId) VALUES (#p0, #p1, #p2); select last_insert_rowid();#p0 = 'Text1', #p1 = 01/12/2010 14:55:05, #p2 = NULL
14:55:05,750 ERROR [TestRunnerThread] AbstractBatcher [(null)]- Could not execute query: INSERT INTO "Student" (Name, DoB, TutorId) VALUES (#p0, #p1, #p2); select last_insert_rowid()
System.Data.SQLite.SQLiteException (0x80004005): SQLite error
no such table: Student
at System.Data.SQLite.SQLite3.Prepare(String strSql, SQLiteStatement previous, String& strRemain)
at System.Data.SQLite.SQLiteCommand.BuildNextCommand()
at System.Data.SQLite.SQLiteCommand.GetStatement(Int32 index)
at System.Data.SQLite.SQLiteDataReader.NextResult()
at System.Data.SQLite.SQLiteDataReader..ctor(SQLiteCommand cmd, CommandBehavior behave)
at System.Data.SQLite.SQLiteCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.SQLite.SQLiteCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader()
at NHibernate.AdoNet.AbstractBatcher.ExecuteReader(IDbCommand cmd)
14:55:05,781 ERROR [TestRunnerThread] ADOExceptionReporter [(null)]- SQLite error
no such table: Student
DISPOSE
CLOSING CONNECTION
Originally I was using my own code for the connection/session management but have moved to the code in this blog post translated to C# and with a couple changes to the DBConfig method and some debug statements to show the state of the connection.
private FluentNHibernate.Cfg.Db.IPersistenceConfigurer GetDBConfig()
{
return SQLiteConfiguration.Standard
.ConnectionString((ConnectionStringBuilder cs) => cs.Is(CONNECTION_STRING))
.ProxyFactoryFactory("NHibernate.ByteCode.LinFu.ProxyFactoryFactory, NHibernate.ByteCode.LinFu")
.Raw("connection.release_mode", "on_close");
}
I added the on_close after reading this
My test code looks like this:
[Test]
public void CanGetStudentById()
{
using (var scope = new SQLiteDatabaseScope<StudentMapping>())
{
using (ISession sess = scope.OpenSession())
{
// Arrange
var repo = new StudentRepository();
repo.Save(new Student() { Name = "Text1", DoB = DateTime.Now });
// Act
var student = repo.GetById(1);
// Assert
Assert.IsNotNull(student);
Assert.AreEqual("Text1", student.Name);
}
}
}
What have I overlooked here?
Update: I created a copy of the class that connects to an SQLite file DB and it worked fine. So it has to be something to do with the connection being closed.

Answer 1

If you change your test method to the following, does it work?
[Test]
public void CanGetStudentById()
{
using (var scope = new SQLiteDatabaseScope<StudentMapping>())
{
using (ISession sess = scope.OpenSession())
{
// Arrange
sess.Save(new Student() { Name = "Text1", DoB = DateTime.Now });
// Act
var student = sess.Get<Student>(1);
// Assert
Assert.IsNotNull(student);
Assert.AreEqual("Text1", student.Name);
}
}
}
I would hazard to guess that your StudentRepository is opening its own session and hence doesn't see the table.