Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/sqlalchemy/dialects/mysql/json.py: 38%

1# mysql/json.py 

2# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors 

3# <see AUTHORS file> 

4# 

5# This module is part of SQLAlchemy and is released under 

6# the MIT License: https://www.opensource.org/licenses/mit-license.php 

7 

8from __future__ import absolute_import 

9 

10from ... import types as sqltypes 

11 

12 

13class JSON(sqltypes.JSON): 

14 """MySQL JSON type. 

15 

16 MySQL supports JSON as of version 5.7. 

17 MariaDB supports JSON (as an alias for LONGTEXT) as of version 10.2. 

18 

19 :class:`_mysql.JSON` is used automatically whenever the base 

20 :class:`_types.JSON` datatype is used against a MySQL or MariaDB backend. 

21 

22 .. seealso:: 

23 

24 :class:`_types.JSON` - main documentation for the generic 

25 cross-platform JSON datatype. 

26 

27 The :class:`.mysql.JSON` type supports persistence of JSON values 

28 as well as the core index operations provided by :class:`_types.JSON` 

29 datatype, by adapting the operations to render the ``JSON_EXTRACT`` 

30 function at the database level. 

31 

32 .. versionadded:: 1.1 

33 

34 """ 

35 

36 pass 

37 

38 

39class _FormatTypeMixin(object): 

40 def _format_value(self, value): 

41 raise NotImplementedError() 

42 

43 def bind_processor(self, dialect): 

44 super_proc = self.string_bind_processor(dialect) 

45 

46 def process(value): 

47 value = self._format_value(value) 

48 if super_proc: 

49 value = super_proc(value) 

50 return value 

51 

52 return process 

53 

54 def literal_processor(self, dialect): 

55 super_proc = self.string_literal_processor(dialect) 

56 

57 def process(value): 

58 value = self._format_value(value) 

59 if super_proc: 

60 value = super_proc(value) 

61 return value 

62 

63 return process 

64 

65 

66class JSONIndexType(_FormatTypeMixin, sqltypes.JSON.JSONIndexType): 

67 def _format_value(self, value): 

68 if isinstance(value, int): 

69 value = "$[%s]" % value 

70 else: 

71 value = '$."%s"' % value 

72 return value 

73 

74 

75class JSONPathType(_FormatTypeMixin, sqltypes.JSON.JSONPathType): 

76 def _format_value(self, value): 

77 return "$%s" % ( 

78 "".join( 

79 [ 

80 "[%s]" % elem if isinstance(elem, int) else '."%s"' % elem 

81 for elem in value 

82 ] 

83 ) 

84 )