public virtual string Execute(ICommandContext commandContext)
{
DbSqlSessionFactory dbSqlSessionFactory = (DbSqlSessionFactory)commandContext.SessionFactories[typeof(DbSqlSession)];
DbSqlSession dbSqlSession = new DbSqlSession(dbSqlSessionFactory, commandContext.EntityCache, connection, catalog, schema);
commandContext.Sessions[typeof(DbSqlSession)] = dbSqlSession;
return(dbSqlSession.DbSchemaUpdate());
}