re-added create_all helper method

Author: adamhadani

rdflib_sqlalchemy/store.py

@@ -235,8 +235,7 @@ def open(self, configuration, create=True):
         self.engine = sqlalchemy.create_engine(configuration)
         with self.engine.connect():
             if create:
-                # Create all of the database tables (idempotent)
-                self.metadata.create_all(self.engine)
+                self.create_all()
 
             ret_value = self._verify_store_exists()
 
@@ -245,6 +244,10 @@ def open(self, configuration, create=True):
 
         return ret_value
 
+    def create_all(self):
+        """Create all of the database tables (idempotent)."""
+        self.metadata.create_all(self.engine)
+
     def close(self, commit_pending_transaction=False):
         """
         Close the current store engine connection if one is open.