title: Sqlalchemy.exc.UnboundExecutionError: Could not locate a bind configured on mapper Mapper|SellsTable|sellers or this Session
body: <p>I create a class for working with <code>SQLAlchemy</code> :</p>
  
  <pre><code>class DbAbsLayer(object):
      def __init__(self):
          self.setConnectionURI();
      def setConnectionURI(self):
          self.dbDriver = "mysql";
          self.dbHostname = "localhost";
          self.dbUsername = "root";
          self.dbPassword = "123";
          self.dbName = "mydbname";
      def createSession(self):
          Session = sessionmaker();
          self.session = Session.configure();
          self.session = Session();
      def createEngine(self):
          self.setConnectionURI();
          self.engine = create_engine(self.dbDriver + "://" + self.dbUsername + ":" + self.dbPassword + "@" + self.dbHostname + "/" + self.dbName);
  </code></pre>
  
  <p>Then i created My table class:</p>
  
  <pre><code>class SellsTable(declarative_base()):
      __tablename__ = 'sellers'; #    
      id = Column(Integer,primary_key = True)
      name = Column(String)
      name_type = Column(Integer)
      address = Column(String)
      telephones = Column(String)
      emails = Column(String)
      job_background = Column(String)
      agent_first_name = Column(String)
      agent_last_name = Column(String)    
      agent_attributes = Column(String)
      agent_values = Column(String) 
  </code></pre>
  
  <p>Its Constructor: </p>
  
  <pre><code>def __init__(self,fieldsName ,fieldsValue):
      completeVariableName = list();
      tmpKeysOfFieldsValue = fieldsValue.keys();
      for fieldsNameCounter in range (0,len(fieldsName)):
          for filedsValueCounter in range(0,len(tmpKeysOfFieldsValue)):
              if fieldsName[fieldsNameCounter] == tmpKeysOfFieldsValue[filedsValueCounter]:
                  completeVariableName.append("self." + tmpKeysOfFieldsValue[filedsValueCounter]);
                  tmpVariable = completeVariableName[filedsValueCounter];
                  tmpValue = fieldsValue[fieldsName[fieldsNameCounter]];
                  exec ('%s = \"%s\"' % (tmpVariable, tmpValue));
  </code></pre>
  
  <p>I have the following function for adding <code>record</code>:</p>
  
  <pre><code>def addRecord(self,tableObj):
      TableClass = tableObj.__class__ ;
      sessionObj = TableClass(['name','telephones'],dict([('name','golrang'),('telephones','092127878,21078288')]));
      self.session.add(sessionObj); ##### MY ERROR LINE 
      self.session.commit();
  </code></pre>
  
  <p>But when i run add func, i get the following trace back:</p>
  
  <pre><code>Traceback (most recent call last):
    File "./main.py", line 218, in &lt;module&gt;
      main()
    File "./main.py", line 210, in main
      dbObj.addRecord(ddd);
    File "./main.py", line 104, in addRecord
      self.session.commit();
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 721, in commit
      self.transaction.commit()
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 354, in commit
      self._prepare_impl()
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 334, in _prepare_impl
      self.session.flush()
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1818, in flush
      self._flush(objects)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1936, in _flush
      transaction.rollback(_capture_exception=True)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/util/langhelpers.py", line 58, in __exit__
      compat.reraise(exc_type, exc_value, exc_tb)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1900, in _flush
      flush_context.execute()
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 372, in execute
      rec.execute(self)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/unitofwork.py", line 525, in execute
      uow
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 45, in save_obj
      uowtransaction)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 140, in _organize_states_for_save
      states):
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/persistence.py", line 772, in _connections_for_states
      base_mapper)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 211, in connection
      bind = self.session.get_bind(bindkey, **kwargs)
    File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1102, in get_bind
      ', '.join(context)))
  sqlalchemy.exc.UnboundExecutionError: Could not locate a bind configured on mapper Mapper|SellsTable|sellers or this Session
  </code></pre>