How to know query generated by Fluent NHibernate

Question

I am using linq to Nhibernate to fire some select query to data base.

My question is, how do I know, the query generated by Fluent NHibernate?

Answer 1

With Fluent NHibernate, you can turn on show_sql like this:

Fluently.Configure()
    .Database( MsSqlConfiguration.MsSql2005.ShowSql().ConnectionString(...) )...

NHibernate will now print every sql statement to Console.Out.

Answer 2

See this. What you need is hibernate.show_sql.

Answer 3

You can use sql profilers like this one too.

Answer 4

I have found 4 options to know sql query in nhibernate and fluent nhibernate.

1. Log - Joey V. said in answer of this same question.
2. ShowSql - Kevin Berridge said in answer of this same question.
3. NHProf - This is a awesome profiler. NHProf

4. Intercepter - It is really good to see sql. we can put it in our Output of Visual Studio and even in log file.

   ISessionFactory sf = Fluently.Configure()
           .Database(MySQLConfiguration.Standard.ConnectionString(ConnectionString).ShowSql())
           .Mappings(m => m.FluentMappings.AddFromAssemblyOf<Stock>())
           .ExposeConfiguration(c => c.SetInterceptor(new ABCInterceptor()))
           .BuildSessionFactory();
   
   
   public class ABCInterceptor : EmptyInterceptor
   {
       public override NHibernate.SqlCommand.SqlString OnPrepareStatement(NHibernate.SqlCommand.SqlString sql)
       {
          Trace.WriteLine(sql.ToString());
          return sql;
       }
    }
   

Answer 5

If you want the SQL to be in log4net, make sure you set the logger in your configuration section.

I put the NHibernate package at "INFO" to reduce the noise and the NHibernate.SQL to all so I can log all SQL statements.

  
 <logger name="NHibernate">
   <level value="INFO" />
 </logger>


  <logger name="NHibernate.SQL">
    <level value="ALL" />
  </logger>

Answer 6

You might also find this useful http://nhprof.com/