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
|
# Copyright (C) 2005-2023 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php
# mypy: ignore-errors
r"""
.. dialect:: oracle+oracledb
:name: python-oracledb
:dbapi: oracledb
:connectstring: oracle+oracledb://user:pass@hostname:port[/dbname][?service_name=<service>[&key=value&key=value...]]
:url: https://oracle.github.io/python-oracledb/
python-oracledb is released by Oracle to supersede the cx_Oracle driver.
It is fully compatible with cx_Oracle and features both a "thin" client
mode that requires no dependencies, as well as a "thick" mode that uses
the Oracle Client Interface in the same way as cx_Oracle.
.. seealso::
:ref:`cx_oracle` - all of cx_Oracle's notes apply to the oracledb driver
as well.
Thick mode support
------------------
By default the ``python-oracledb`` is started in thin mode, that does not
require oracle client libraries to be installed in the system. The
``python-oracledb`` driver also support a "thick" mode, that behaves
similarly to ``cx_oracle`` and requires that Oracle Client Interface (OCI)
is installed.
To enable this mode, the user may call ``oracledb.init_oracle_client``
manually, or by passing the parameter ``thick_mode=True`` to
:func:`_sa.create_engine`. To pass custom arguments to ``init_oracle_client``,
like the ``lib_dir`` path, a dict may be passed to this parameter, as in::
engine = sa.create_engine("oracle+oracledb://...", thick_mode={
"lib_dir": "/path/to/oracle/client/lib", "driver_name": "my-app"
})
.. seealso::
https://python-oracledb.readthedocs.io/en/latest/api_manual/module.html#oracledb.init_oracle_client
.. versionadded:: 2.0.0 added support for oracledb driver.
""" # noqa
import re
from .cx_oracle import OracleDialect_cx_oracle as _OracleDialect_cx_oracle
from ... import exc
class OracleDialect_oracledb(_OracleDialect_cx_oracle):
supports_statement_cache = True
driver = "oracledb"
def __init__(
self,
auto_convert_lobs=True,
coerce_to_decimal=True,
arraysize=50,
encoding_errors=None,
thick_mode=None,
**kwargs,
):
super().__init__(
auto_convert_lobs,
coerce_to_decimal,
arraysize,
encoding_errors,
**kwargs,
)
if self.dbapi is not None and (
thick_mode or isinstance(thick_mode, dict)
):
kw = thick_mode if isinstance(thick_mode, dict) else {}
self.dbapi.init_oracle_client(**kw)
@classmethod
def import_dbapi(cls):
import oracledb
return oracledb
@classmethod
def is_thin_mode(cls, connection):
return connection.connection.dbapi_connection.thin
def _load_version(self, dbapi_module):
version = (0, 0, 0)
if dbapi_module is not None:
m = re.match(r"(\d+)\.(\d+)(?:\.(\d+))?", dbapi_module.version)
if m:
version = tuple(
int(x) for x in m.group(1, 2, 3) if x is not None
)
self.oracledb_ver = version
if self.oracledb_ver < (1,) and self.oracledb_ver > (0, 0, 0):
raise exc.InvalidRequestError(
"oracledb version 1 and above are supported"
)
dialect = OracleDialect_oracledb
|
