Verify client version. (#148)

* Check client version.

* Fix execute_json.

* Address comment.

example/GraphClientSimpleExample.py

@@ -11,7 +11,6 @@
 
 from nebula2.gclient.net import ConnectionPool
 from nebula2.Config import Config
-from nebula2.common import *
 from FormatResp import print_resp
 
 if __name__ == '__main__':
@@ -53,28 +52,10 @@
         assert resp.is_succeeded(), resp.error_msg()
         print_resp(resp)
 
-        bval = ttypes.Value()
-        bval.set_bVal(True)
-        ival = ttypes.Value()
-        ival.set_iVal(3)
-        sval = ttypes.Value()
-        sval.set_sVal("Cypher Parameter")
-        params={"p1":ival,"p2":bval,"p3":sval}
-
-        # test parameter interface
-        resp = client.execute_parameter('RETURN abs($p1)+3, toBoolean($p2) and false, toLower($p3)+1',params)
-        assert resp.is_succeeded(), resp.error_msg()
-        print_resp(resp)
-        # test compatibility
-        resp = client.execute('RETURN 3')
+        resp = client.execute('FETCH PROP ON like "Bob"->"Lily"')
         assert resp.is_succeeded(), resp.error_msg()
         print_resp(resp)
 
-        # get the result in json format
-        resp_json = client.execute_json_with_parameter("yield 1", params)
-        json_obj = json.loads(resp_json)
-        print(json.dumps(json_obj, indent=2, sort_keys=True))
-
         # drop space
         resp = client.execute('DROP SPACE test')
         assert resp.is_succeeded(), resp.error_msg()

nebula2/Exception.py

@@ -79,3 +79,6 @@ def __init__(self, code=E_UNKNOWN, message=None):
         self.type = code
         self.message = message
 
+class ClientServerIncompatibleException(Exception):
+    def __init__(self, message):
+        Exception.__init__(self, f'Current client is not compatible with the remote server, please check the version: {message}')

nebula2/common/constants.py

@@ -14,5 +14,7 @@
 
 
 
-from .ttypes import UTF8STRINGS, NullType, ErrorCode, SchemaID, Date, Time, DateTime, Value, NList, NMap, NSet, Row, DataSet, Tag, Vertex, Edge, Step, Path, HostAddr, KeyValue, LogInfo, DirInfo, NodeInfo, PartitionBackupInfo, CheckpointInfo, GraphSpaceID, PartitionID, TagID, EdgeType, EdgeRanking, LogID, TermID, Timestamp, IndexID, Port, SessionID, ExecutionPlanID
+from .ttypes import UTF8STRINGS, NullType, ErrorCode, SchemaID, Date, Time, DateTime, Value, NList, NMap, NSet, Row, DataSet, Geography, Tag, Vertex, Edge, Step, Path, HostAddr, KeyValue, LogInfo, DirInfo, NodeInfo, PartitionBackupInfo, CheckpointInfo, GraphSpaceID, PartitionID, TagID, EdgeType, EdgeRanking, LogID, TermID, Timestamp, IndexID, Port, SessionID, ExecutionPlanID
+
+version = "2.6.0"