File size: 32,749 Bytes
ae01f49
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
##########################################################################
#
# pgAdmin 4 - PostgreSQL Tools
#
# Copyright (C) 2013 - 2024, The pgAdmin Development Team
# This software is released under the PostgreSQL Licence
#
##########################################################################

""" Implemented classes for the different object type used by data grid """

from abc import ABCMeta, abstractmethod
from collections import OrderedDict
from flask import render_template
from flask_babel import gettext
from werkzeug.exceptions import InternalServerError
from pgadmin.utils.ajax import forbidden
from pgadmin.utils.driver import get_driver
from pgadmin.tools.sqleditor.utils.is_query_resultset_updatable \
    import is_query_resultset_updatable, _check_single_table
from pgadmin.tools.sqleditor.utils.save_changed_data import save_changed_data
from pgadmin.tools.sqleditor.utils.get_column_types import get_columns_types
from pgadmin.utils.preferences import Preferences
from pgadmin.utils.exception import ObjectGone, ExecuteError
from pgadmin.utils.constants import SERVER_CONNECTION_CLOSED
from config import PG_DEFAULT_DRIVER

VIEW_FIRST_100_ROWS = 1
VIEW_LAST_100_ROWS = 2
VIEW_ALL_ROWS = 3
VIEW_FILTERED_ROWS = 4


class ObjectRegistry(ABCMeta):
    """
    class ObjectRegistry(ABCMeta)
        Every object will be registered automatically by its object type.

    Class-level Methods:
    ----------- -------
    * get_object(cls, name, **kwargs)
      - This method returns the object based on register object type
        else return not implemented error.
    """

    registry = dict()

    def __init__(self, name, bases, d):
        """
        This method is used to register the objects based on object type.
        """

        if d and 'object_type' in d:
            ObjectRegistry.registry[d['object_type']] = self

        ABCMeta.__init__(self, name, bases, d)

    @classmethod
    def get_object(cls, name, **kwargs):
        """
        This method returns the object based on register object type
        else return not implemented error

        Args:
            name: object type for which object to be returned.
            **kwargs: N number of parameters
        """

        if name in ObjectRegistry.registry:
            return (ObjectRegistry.registry[name])(**kwargs)

        raise NotImplementedError(
            gettext("This feature has not been implemented for object "
                    "type '{0}'.").format(name)
        )


class BaseCommand(metaclass=ObjectRegistry):
    """
    class BaseCommand

        It is a base class for SQL Tools like data grid and query tool.
        A different sql tools must implement this to expose abstract methods.

    Abstract Methods:
    -------- -------
    * get_sql()
      - This method returns the proper SQL query for the object type.

    * can_edit()
      - This method returns True/False, specifying whether data is
        editable or not.

    * can_filter()
      - This method returns True/False, specifying whether filter
        will be applied on data or not.
    """

    def __init__(self, **kwargs):
        """
        This method is used to initialize the class and
        create a proper object name which will be used
        to fetch the data using namespace name and object name.

        Args:
            **kwargs : N number of parameters
        """

        # Save the server group id, server id and database id, namespace id,
        # object id
        self.sgid = kwargs['sgid'] if 'sgid' in kwargs else None
        self.sid = kwargs['sid'] if 'sid' in kwargs else None
        self.did = kwargs['did'] if 'did' in kwargs else None

    @abstractmethod
    def get_sql(self):
        pass

    @abstractmethod
    def can_edit(self):
        pass

    @abstractmethod
    def can_filter(self):
        pass


class SQLFilter():
    """
    class SQLFilter

        Implementation of filter class for sql grid.

    Class-level Methods:
    ----------- -------
    * get_filter()
      - This method returns the filter applied.
    * set_filter(row_filter)
      - This method sets the filter to be applied.
    * append_filter(row_filter)
      - This method is used to append the filter within existing filter
    * remove_filter()
      - This method removes the filter applied.
    * validate_filter(row_filter)
      - This method validates the given filter.
    * get_data_sorting()
      - This method returns columns for data sorting
    * set_data_sorting()
      - This method saves columns for data sorting
    """

    def __init__(self, **kwargs):
        """
        This method is used to initialize the class and
        create a proper object name which will be used
        to fetch the data using namespace name and object name.

        Args:
            **kwargs : N number of parameters
        """
        # Save the server id and database id, namespace id, object id
        assert 'sid' in kwargs
        assert 'did' in kwargs
        assert 'obj_id' in kwargs

        self.sid = kwargs['sid']
        self.did = kwargs['did']
        self.obj_id = kwargs['obj_id']
        sql_filter = kwargs.get('sql_filter', None)
        self._row_filter = sql_filter if isinstance(sql_filter, str) else None
        self._data_sorting = kwargs.get('data_sorting', None)
        self._set_sorting_from_filter_dialog = False

        manager = get_driver(PG_DEFAULT_DRIVER).connection_manager(self.sid)
        conn = manager.connection(did=self.did)

        # we will set template path for sql scripts
        self.sql_path = 'sqleditor/sql/#{0}#'.format(manager.version)

        if conn.connected():
            # Fetch the Namespace Name and object Name
            query = render_template(
                "/".join([self.sql_path, 'objectname.sql']),
                obj_id=self.obj_id
            )

            status, result = conn.execute_dict(query)
            if not status:
                raise ExecuteError(result)
            if len(result['rows']) == 0:
                raise ObjectGone(
                    gettext("The specified object could not be found."))

            self.nsp_name = result['rows'][0]['nspname']
            self.object_name = result['rows'][0]['relname']
        else:
            raise InternalServerError(SERVER_CONNECTION_CLOSED)

    def get_filter(self):
        """
        This function returns the filter.
        """
        return self._row_filter

    def set_filter(self, row_filter):
        """
        This function validates the filter and set the
        given filter to member variable.

        Args:
            row_filter: sql query
        """
        if not isinstance(row_filter, str):
            row_filter = None

        status, msg = self.validate_filter(row_filter)

        if status:
            self._row_filter = row_filter

        return status, msg

    def get_data_sorting(self):
        """
        This function returns the filter.
        """
        if self._data_sorting and len(self._data_sorting) > 0:
            return self._data_sorting
        return None

    def set_data_sorting(self, data_filter, set_from_filter_dialog=False):
        """
        This function validates the filter and set the
        given filter to member variable.
        """
        self._data_sorting = data_filter['data_sorting']
        self._set_sorting_from_filter_dialog = set_from_filter_dialog

    def is_sorting_set_from_filter_dialog(self):
        """This function return whether sorting is set from filter dialog"""
        return self._set_sorting_from_filter_dialog

    def is_filter_applied(self):
        """
        This function returns True if filter is applied else False.
        """
        is_filter_applied = True
        if self._row_filter is None or self._row_filter == '':
            is_filter_applied = False

        if not is_filter_applied and \
                self._data_sorting and len(self._data_sorting) > 0:
            is_filter_applied = True

        return is_filter_applied

    def remove_filter(self):
        """
        This function remove the filter by setting value to None.
        """
        self._row_filter = None
        self._data_sorting = None

    def append_filter(self, row_filter):
        """
        This function will used to get the existing filter and append
        the given filter.

        Args:
            row_filter: sql query to append
        """

        existing_filter = self.get_filter()

        if existing_filter is None or existing_filter == '':
            self._row_filter = row_filter
        else:
            self._row_filter = existing_filter + ' \n    AND ' + row_filter

    def validate_filter(self, row_filter):
        """
        This function validates the given filter.

        Args:
            row_filter: sql syntax to validate
        """
        status = True
        result = None

        if row_filter is not None and row_filter != '':
            manager = \
                get_driver(PG_DEFAULT_DRIVER).connection_manager(self.sid)
            conn = manager.connection(did=self.did)

            if conn.connected():
                sql = render_template(
                    "/".join([self.sql_path, 'validate.sql']),
                    nsp_name=self.nsp_name, object_name=self.object_name,
                    row_filter=row_filter)

                status, result = conn.execute_scalar(sql)
                if not status:
                    result = result.partition("\n")[0]

        return status, result


class FetchedRowTracker():
    """
    Keeps track of fetched row count.
    """

    def __init__(self, **kwargs):
        self.fetched_rows = 0

    def get_fetched_row_cnt(self):
        return self.fetched_rows

    def update_fetched_row_cnt(self, rows_cnt):
        self.fetched_rows = rows_cnt


class GridCommand(BaseCommand, SQLFilter, FetchedRowTracker):
    """
    class GridCommand()

        It is a base class for different object type used by data grid.
        A different object type must implement this to expose abstract methods.

    Class-level Methods:
    ----------- -------
    * get_primary_keys()
      - Derived class can implement there own logic to get the primary keys.

    * save()
      - Derived class can implement there own logic to save the data into the
      database.

    * set_limit(limit)
      - This method sets the limit for SQL query

    * get_limit()
      - This method returns the limit.
    """

    def __init__(self, **kwargs):
        """
        This method is used to call base class init to initialize
        the data.

        Args:
            **kwargs : N number of parameters
        """
        BaseCommand.__init__(self, **kwargs)
        SQLFilter.__init__(self, **kwargs)
        FetchedRowTracker.__init__(self, **kwargs)

        # Save the connection id, command type
        self.conn_id = kwargs['conn_id'] if 'conn_id' in kwargs else None
        self.cmd_type = kwargs['cmd_type'] if 'cmd_type' in kwargs else None
        self.limit = -1
        self._OBJECT_QUERY_SQL = 'objectquery.sql'

        if self.cmd_type in (VIEW_FIRST_100_ROWS, VIEW_LAST_100_ROWS):
            self.limit = 100

        self.thread_native_id = None

    def get_primary_keys(self, *args, **kwargs):
        return None, None

    def get_all_columns_with_order(self, default_conn):
        """
        Responsible for fetching columns from given object

        Args:
            default_conn: Connection object

        Returns:
            all_sorted_columns: Columns which are already sorted which will
                         be used to populate the Grid in the dialog
            all_columns: List of all the column for given object which will
                         be used to fill columns options
        """
        driver = get_driver(PG_DEFAULT_DRIVER)
        if default_conn is None:
            manager = driver.connection_manager(self.sid)
            conn = manager.connection(did=self.did, conn_id=self.conn_id)
        else:
            conn = default_conn

        all_sorted_columns = []
        data_sorting = self.get_data_sorting()
        all_columns = []
        if conn.connected():
            # Fetch the rest of the column names
            query = render_template(
                "/".join([self.sql_path, 'get_columns.sql']),
                table_name=self.object_name,
                table_nspname=self.nsp_name,
                conn=conn,
            )
            status, result = conn.execute_dict(query)
            if not status:
                raise ExecuteError(result)

            for row in result['rows']:
                all_columns.append(row['attname'])
        else:
            raise InternalServerError(SERVER_CONNECTION_CLOSED)

        # If user has custom data sorting then pass as it as it is
        if data_sorting and len(data_sorting) > 0:
            all_sorted_columns = data_sorting

        return all_sorted_columns, all_columns

    def save(self, changed_data, default_conn=None):
        return forbidden(
            errmsg=gettext("Data cannot be saved for the current object.")
        )

    def get_limit(self):
        """
        This function returns the limit for the SQL query.
        """
        return self.limit

    def set_limit(self, limit):
        """
        This function sets the limit for the SQL query
        Args:
            limit: limit to be set for SQL.
        """
        self.limit = limit

    def get_pk_order(self):
        """
        This function gets the order required for primary keys
        """
        if self.cmd_type == VIEW_LAST_100_ROWS:
            return 'desc'
        else:
            return 'asc'

    def get_thread_native_id(self):
        return self.thread_native_id

    def set_thread_native_id(self, thread_native_id):
        self.thread_native_id = thread_native_id


class TableCommand(GridCommand):
    """
    class TableCommand(GridCommand)

        It is a derived class for Table type.
    """
    object_type = 'table'

    def __init__(self, **kwargs):
        """
        This method calls the __init__ method of the base class
        to get the proper object name.

        Args:
            **kwargs : N number of parameters
        """

        # call base class init to fetch the table name
        super().__init__(**kwargs)

        # Set the default sorting on table data by primary key if user
        # preference value is set
        self.data_sorting_by_pk = Preferences.module('sqleditor').preference(
            'table_view_data_by_pk').get()

    def get_sql(self, default_conn=None):
        """
        This method is used to create a proper SQL query
        to fetch the data for the specified table
        """

        # Fetch the primary keys for the table
        _, primary_keys = self.get_primary_keys(default_conn)

        # Fetch OIDs status
        has_oids = self.has_oids(default_conn)

        sql_filter = self.get_filter()
        data_sorting = self.get_data_sorting()

        # If data sorting is none and not reset from the filter dialog then
        # set the data sorting in following conditions:
        #   1. When command type is VIEW_FIRST_100_ROWS or VIEW_LAST_100_ROWS.
        #   2. When command type is VIEW_ALL_ROWS and limit is greater than 0

        if data_sorting is None and \
            not self.is_sorting_set_from_filter_dialog() \
            and (self.cmd_type in (VIEW_FIRST_100_ROWS, VIEW_LAST_100_ROWS) or
                 (self.cmd_type == VIEW_ALL_ROWS and self.data_sorting_by_pk)):
            sorting = {'data_sorting': []}
            for pk in primary_keys:
                sorting['data_sorting'].append(
                    {'name': pk, 'order': self.get_pk_order()})
            self.set_data_sorting(sorting)
            data_sorting = self.get_data_sorting()

        if sql_filter is None:
            sql = render_template(
                "/".join([self.sql_path, self._OBJECT_QUERY_SQL]),
                object_name=self.object_name,
                nsp_name=self.nsp_name, limit=self.limit, has_oids=has_oids,
                data_sorting=data_sorting
            )
        else:
            sql = render_template(
                "/".join([self.sql_path, self._OBJECT_QUERY_SQL]),
                object_name=self.object_name,
                nsp_name=self.nsp_name, limit=self.limit, has_oids=has_oids,
                sql_filter=sql_filter, data_sorting=data_sorting
            )

        return sql

    def get_primary_keys(self, default_conn=None):
        """
        This function is used to fetch the primary key columns.
        """
        driver = get_driver(PG_DEFAULT_DRIVER)
        if default_conn is None:
            manager = driver.connection_manager(self.sid)
            conn = manager.connection(did=self.did, conn_id=self.conn_id)
        else:
            conn = default_conn

        pk_names = ''
        primary_keys = OrderedDict()

        if conn.connected():

            # Fetch the primary key column names
            query = render_template(
                "/".join([self.sql_path, 'primary_keys.sql']),
                table_name=self.object_name,
                table_nspname=self.nsp_name,
                conn=conn,
            )

            status, result = conn.execute_dict(query)
            if not status:
                raise ExecuteError(result)

            for row in result['rows']:
                pk_names += driver.qtIdent(conn, row['attname']) + ','
                primary_keys[row['attname']] = row['typname']

            if pk_names != '':
                # Remove last character from the string
                pk_names = pk_names[:-1]
        else:
            raise InternalServerError(SERVER_CONNECTION_CLOSED)

        return pk_names, primary_keys

    def get_all_columns_with_order(self, default_conn=None):
        """
        It is overridden method specially for Table because we all have to
        fetch primary keys and rest of the columns both.

        Args:
            default_conn: Connection object

        Returns:
            all_sorted_columns: Sorted columns for the Grid
            all_columns: List of columns for the select2 options
        """
        driver = get_driver(PG_DEFAULT_DRIVER)
        if default_conn is None:
            manager = driver.connection_manager(self.sid)
            conn = manager.connection(did=self.did, conn_id=self.conn_id)
        else:
            conn = default_conn

        all_sorted_columns = []
        data_sorting = self.get_data_sorting()
        all_columns = []
        # Fetch the primary key column names
        query = render_template(
            "/".join([self.sql_path, 'primary_keys.sql']),
            table_name=self.object_name,
            table_nspname=self.nsp_name,
            conn=conn,
        )

        status, result = conn.execute_dict(query)

        if not status:
            raise ExecuteError(result)

        for row in result['rows']:
            all_columns.append(row['attname'])

        # Fetch the rest of the column names
        query = render_template(
            "/".join([self.sql_path, 'get_columns.sql']),
            table_name=self.object_name,
            table_nspname=self.nsp_name,
            conn=conn,
        )
        status, result = conn.execute_dict(query)
        if not status:
            raise ExecuteError(result)

        for row in result['rows']:
            # Only append if not already present in the list
            if row['attname'] not in all_columns:
                all_columns.append(row['attname'])

        # If user has custom data sorting then pass as it as it is
        if data_sorting and len(data_sorting) > 0:
            all_sorted_columns = data_sorting

        return all_sorted_columns, all_columns

    def can_edit(self):
        return True

    def can_filter(self):
        return True

    def has_oids(self, default_conn=None):
        """
        This function checks whether the table has oids or not.
        """
        driver = get_driver(PG_DEFAULT_DRIVER)
        manager = driver.connection_manager(self.sid)

        # Remove the special behavior of OID columns from
        # PostgreSQL 12 onwards, so returning False.
        if manager.sversion >= 120000:
            return False

        if default_conn is None:
            conn = manager.connection(did=self.did, conn_id=self.conn_id)
        else:
            conn = default_conn

        if conn.connected():

            # Fetch the table oids status
            query = render_template(
                "/".join([self.sql_path, 'has_oids.sql']), obj_id=self.obj_id)

            status, has_oids = conn.execute_scalar(query)
            if not status:
                raise ExecuteError(has_oids)

        else:
            raise InternalServerError(SERVER_CONNECTION_CLOSED)

        return has_oids

    def save(self,
             changed_data,
             columns_info,
             client_primary_key='__temp_PK',
             default_conn=None):
        """
        This function is used to save the data into the database.
        Depending on condition it will either update or insert the
        new row into the database.

        Args:
            changed_data: Contains data to be saved
            columns_info:
            default_conn:
            client_primary_key:
        """
        driver = get_driver(PG_DEFAULT_DRIVER)
        if default_conn is None:
            manager = driver.connection_manager(self.sid)
            conn = manager.connection(did=self.did, conn_id=self.conn_id)
        else:
            conn = default_conn

        return save_changed_data(changed_data=changed_data,
                                 columns_info=columns_info,
                                 command_obj=self,
                                 client_primary_key=client_primary_key,
                                 conn=conn)

    def get_columns_types(self, conn):
        columns_info = conn.get_column_info()
        has_oids = self.has_oids()
        table_name = None
        table_nspname = None
        table_oid = _check_single_table(columns_info)
        if table_oid is None:
            table_name = self.object_name
            table_nspname = self.nsp_name

        return get_columns_types(conn=conn,
                                 columns_info=columns_info,
                                 has_oids=has_oids,
                                 table_oid=table_oid,
                                 is_query_tool=False,
                                 table_name=table_name,
                                 table_nspname=table_nspname,
                                 )


class ViewCommand(GridCommand):
    """
    class ViewCommand(GridCommand)

        It is a derived class for View type.
    """
    object_type = 'view'

    def __init__(self, **kwargs):
        """
        This method calls the __init__ method of the base class
        to get the proper object name.

        Args:
            **kwargs : N number of parameters
        """

        # call base class init to fetch the table name
        super().__init__(**kwargs)

    def get_sql(self, default_conn=None):
        """
        This method is used to create a proper SQL query
        to fetch the data for the specified view
        """
        sql_filter = self.get_filter()
        data_sorting = self.get_data_sorting()

        if sql_filter is None:
            sql = render_template(
                "/".join([self.sql_path, self._OBJECT_QUERY_SQL]),
                object_name=self.object_name, nsp_name=self.nsp_name,
                limit=self.limit, data_sorting=data_sorting
            )
        else:
            sql = render_template(
                "/".join([self.sql_path, self._OBJECT_QUERY_SQL]),
                object_name=self.object_name, nsp_name=self.nsp_name,
                sql_filter=sql_filter, limit=self.limit,
                data_sorting=data_sorting
            )

        return sql

    def can_edit(self):
        return False

    def can_filter(self):
        return True


class MViewCommand(ViewCommand):
    """
    class MViewCommand(ViewCommand)

        It is a derived class for View type has
        same functionality of View
    """
    object_type = 'mview'


class ForeignTableCommand(GridCommand):
    """
    class ForeignTableCommand(GridCommand)

        It is a derived class for ForeignTable type.
    """
    object_type = 'foreign_table'

    def __init__(self, **kwargs):
        """
        This method calls the __init__ method of the base class
        to get the proper object name.

        Args:
            **kwargs : N number of parameters
        """

        # call base class init to fetch the table name
        super().__init__(**kwargs)

    def get_sql(self, default_conn=None):
        """
        This method is used to create a proper SQL query
        to fetch the data for the specified foreign table
        """
        sql_filter = self.get_filter()
        data_sorting = self.get_data_sorting()

        if sql_filter is None:
            sql = render_template(
                "/".join([self.sql_path, self._OBJECT_QUERY_SQL]),
                object_name=self.object_name, nsp_name=self.nsp_name,
                limit=self.limit, data_sorting=data_sorting
            )
        else:
            sql = render_template(
                "/".join([self.sql_path, self._OBJECT_QUERY_SQL]),
                object_name=self.object_name, nsp_name=self.nsp_name,
                sql_filter=sql_filter, limit=self.limit,
                data_sorting=data_sorting
            )

        return sql

    def can_edit(self):
        return False

    def can_filter(self):
        return True


class CatalogCommand(GridCommand):
    """
    class CatalogCommand(GridCommand)

        It is a derived class for CatalogObject type.
    """
    object_type = 'catalog_object'

    def __init__(self, **kwargs):
        """
        This method calls the __init__ method of the base class
        to get the proper object name.

        Args:
            **kwargs : N number of parameters
        """

        # call base class init to fetch the table name
        super().__init__(**kwargs)

    def get_sql(self, default_conn=None):
        """
        This method is used to create a proper SQL query
        to fetch the data for the specified catalog object
        """
        sql_filter = self.get_filter()
        data_sorting = self.get_data_sorting()

        if sql_filter is None:
            sql = render_template(
                "/".join([self.sql_path, self._OBJECT_QUERY_SQL]),
                object_name=self.object_name, nsp_name=self.nsp_name,
                limit=self.limit, data_sorting=data_sorting
            )
        else:
            sql = render_template(
                "/".join([self.sql_path, self._OBJECT_QUERY_SQL]),
                object_name=self.object_name, nsp_name=self.nsp_name,
                sql_filter=sql_filter, limit=self.limit,
                data_sorting=data_sorting
            )

        return sql

    def can_edit(self):
        return False

    def can_filter(self):
        return True


class QueryToolCommand(BaseCommand, FetchedRowTracker):
    """
    class QueryToolCommand(BaseCommand)

        It is a derived class for Query Tool.
    """
    object_type = 'query_tool'

    def __init__(self, **kwargs):
        # call base class init to fetch the table name

        BaseCommand.__init__(self, **kwargs)
        FetchedRowTracker.__init__(self, **kwargs)

        self.conn_id = kwargs['conn_id'] if 'conn_id' in kwargs else None
        self.conn_id_ac = kwargs['conn_id_ac'] if 'conn_id_ac' in kwargs\
            else None
        self.auto_rollback = False
        self.auto_commit = True

        # Attributes needed to be able to edit updatable resultsets
        self.is_updatable_resultset = False
        self.primary_keys = None
        self.pk_names = None
        self.table_has_oids = False
        self.columns_types = None
        self.thread_native_id = None

    def get_sql(self, default_conn=None):
        return None

    def get_all_columns_with_order(self, default_conn=None):
        return None

    def get_primary_keys(self):
        return self.pk_names, self.primary_keys

    def get_columns_types(self, conn=None):
        return self.columns_types

    def has_oids(self):
        return self.table_has_oids

    def can_edit(self):
        return self.is_updatable_resultset

    def can_filter(self):
        return False

    def check_updatable_results_pkeys_oids(self):
        """
            This function is used to check whether the last successful query
            produced updatable results and sets the necessary flags and
            attributes accordingly.
            Should be called after polling for the results is successful
            (results are ready)
        """
        # Fetch the connection object
        driver = get_driver(PG_DEFAULT_DRIVER)
        manager = driver.connection_manager(self.sid)
        conn = manager.connection(did=self.did, conn_id=self.conn_id)

        # Get the driver version as a float
        driver_version = float('.'.join(driver.version().split('.')[:2]))

        # Checking for updatable resultsets uses features in psycopg 2.8
        if driver_version < 2.8:
            return False

        # Get the path to the sql templates
        sql_path = 'sqleditor/sql/#{0}#'.format(manager.version)

        self.is_updatable_resultset, self.table_has_oids,\
            self.primary_keys, pk_names, table_oid,\
            self.columns_types = is_query_resultset_updatable(conn, sql_path)

        # Create pk_names attribute in the required format
        if pk_names is not None:
            self.pk_names = ''

            for pk_name in pk_names:
                self.pk_names += driver.qtIdent(conn, pk_name) + ','

            if self.pk_names != '':
                # Remove last character from the string
                self.pk_names = self.pk_names[:-1]

        # Add attributes required to be able to update table data
        if self.is_updatable_resultset:
            self.__set_updatable_results_attrs(sql_path=sql_path,
                                               table_oid=table_oid,
                                               conn=conn)
        return self.is_updatable_resultset

    def save(self,
             changed_data,
             columns_info,
             client_primary_key='__temp_PK',
             default_conn=None):
        if not self.is_updatable_resultset:
            return False, gettext('Resultset is not updatable.'), None, None
        else:
            driver = get_driver(PG_DEFAULT_DRIVER)
            if default_conn is None:
                manager = driver.connection_manager(self.sid)
                conn = manager.connection(did=self.did, conn_id=self.conn_id)
            else:
                conn = default_conn

            return save_changed_data(changed_data=changed_data,
                                     columns_info=columns_info,
                                     conn=conn,
                                     command_obj=self,
                                     client_primary_key=client_primary_key,
                                     auto_commit=self.auto_commit)

    def set_connection_id(self, conn_id):
        self.conn_id = conn_id

    def set_connection_id_ac(self, conn_id):
        self.conn_id_ac = conn_id

    def set_auto_rollback(self, auto_rollback):
        self.auto_rollback = auto_rollback

    def set_auto_commit(self, auto_commit):
        self.auto_commit = auto_commit

    def __set_updatable_results_attrs(self, sql_path,
                                      table_oid, conn):
        # Set template path for sql scripts and the table object id
        self.sql_path = sql_path
        self.obj_id = table_oid

        if conn.connected():
            # Fetch the Namespace Name and object Name
            query = render_template(
                "/".join([self.sql_path, 'objectname.sql']),
                obj_id=self.obj_id
            )

            status, result = conn.execute_dict(query)
            if not status:
                raise ExecuteError(result)

            self.nsp_name = result['rows'][0]['nspname']
            self.object_name = result['rows'][0]['relname']
        else:
            raise InternalServerError(SERVER_CONNECTION_CLOSED)

    def get_thread_native_id(self):
        return self.thread_native_id

    def set_thread_native_id(self, thread_native_id):
        self.thread_native_id = thread_native_id