How to know query generated by Fluent NHibernate

StackOverflow https://stackoverflow.com/questions/819040

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?

Was it helpful?

Solution

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>

OTHER TIPS

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.

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

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;
    }
 }

See this. What you need is hibernate.show_sql.

You can use sql profilers like this one too.

Definitely buy and use NHProf. This is an awesome product and not only shows you what queries are being run, but also shows you any potential performance problems with your NHibernate mappings and queries.

You can also hook in log4net.

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