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Title: msilib: can't close opened database
Type: behavior Stage: resolved
Components: Library (Lib), Windows Versions: Python 3.7
Status: closed Resolution: fixed
Dependencies: Superseder:
Assigned To: Nosy List: berker.peksag, gentoo90, loewis, steve.dower, tim.golden, xoviat, zach.ware
Priority: low Keywords: easy, patch

Created on 2014-02-02 15:37 by gentoo90, last changed 2022-04-11 14:57 by admin. This issue is now closed.

File name Uploaded Description Edit
Add_ability_to_close_MSI_database_.patch xoviat, 2016-12-27 17:44
Pull Requests
URL Status Linked Edit
PR 4141 merged berker.peksag, 2017-10-26 20:06
Messages (11)
msg209992 - (view) Author: gentoo90 (gentoo90) Date: 2014-02-02 15:37
In Python 2.7.6 can't find any way to close MSI database after finish working with it.
As a result database is locked and can't be opened by any other application until Python process is finished.

    import msilib
    db = msilib.OpenDatabase('test.msi', msilib.MSIDBOPEN_TRANSACT)
    view = db.OpenView("SELECT File, Component_, FileName FROM File")
    r1 = view.Fetch()
    view.Modify(msilib.MSIMODIFY_UPDATE, r1)
    del db
    db2 = msilib.OpenDatabase('test.msi', msilib.MSIDBOPEN_TRANSACT)

    MSIError: 1: 2203 2: test.msi 3: -2147287008
msg235809 - (view) Author: Mark Lawrence (BreamoreBoy) * Date: 2015-02-12 11:27
Sorry folks I can't try this myself as I'm not running 2.7 and I don't know how to create the test.msi file.
msg283638 - (view) Author: xoviat (xoviat) Date: 2016-12-19 18:01
This is still present in Python 3.5. There is no way to unlock the MSI file without killing the Python process first.
msg283641 - (view) Author: Steve Dower (steve.dower) * (Python committer) Date: 2016-12-19 18:20
Guessing the msiobj_close function in PC/_msi.c ought to be exposed. 

Patches welcome.
msg283648 - (view) Author: xoviat (xoviat) Date: 2016-12-19 19:53
I will prefix this by saying that I have not contributed to the Python source before and this patch is probably wrong, but here is my attempt at a fix.
msg284089 - (view) Author: Berker Peksag (berker.peksag) * (Python committer) Date: 2016-12-27 12:27
Thanks for the patch, 12345. Steve knows better, but I think the method should be named "Close" instead of "close" like _msi.View's Close method.

Also, I couldn't apply your patch:

$ hg imp
unable to find '_msi.c' for patching
patching file _msi.c
2 out of 2 hunks FAILED -- saving rejects to file _msi.c.rej
abort: patch failed to apply

You may want to read for details about creating a patch.
msg284119 - (view) Author: xoviat (xoviat) Date: 2016-12-27 17:44
The method is now capitalized. Unfortunately, none of the methods are compliant with PEP formatting, but it's far too late to do anything about that.
msg305022 - (view) Author: Berker Peksag (berker.peksag) * (Python committer) Date: 2017-10-26 05:01
xoviat, would you like to send your patch as a pull request on GitHub? It would be nice to add a simple test that the new Close() works correctly. I can do that if you don't have time, thank you!

Steve, can we apply this to bugfix branches?
msg305075 - (view) Author: xoviat (xoviat) Date: 2017-10-26 17:58
Unfortunately, this issue has taken on a much lower importance for me, and
as such, I won't be able to address it. Sorry about that.

2017-10-26 0:01 GMT-05:00 Berker Peksag <>:

> Berker Peksag <> added the comment:
> xoviat, would you like to send your patch as a pull request on GitHub? It
> would be nice to add a simple test that the new Close() works correctly. I
> can do that if you don't have time, thank you!
> Steve, can we apply this to bugfix branches?
> ----------
> versions:  -Python 3.5
> _______________________________________
> Python tracker <>
> <>
> _______________________________________
msg305748 - (view) Author: Berker Peksag (berker.peksag) * (Python committer) Date: 2017-11-07 12:58
New changeset a935654f0613640535fbf0ba190f81d02a63d35c by Berker Peksag in branch 'master':
bpo-20486: Implement Database.Close() method in msilib (GH-4141)
msg305749 - (view) Author: Berker Peksag (berker.peksag) * (Python committer) Date: 2017-11-07 13:01
Thank you, all. The OP's snippet should work now:

>>> import msilib as m
>>> db = m.OpenDatabase('py33.msi', m.MSIDBOPEN_TRANSACT)
>>> db.Commit()
>>> db2 = m.OpenDatabase('py33.msi', m.MSIDBOPEN_TRANSACT)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
_msi.MSIError: 1: 2203 2: py33.msi 3: -2147287008
>>> db.Close()
>>> db2 = m.OpenDatabase('py33.msi', m.MSIDBOPEN_TRANSACT)

I didn't backport this to bugfix branches since we added a new public function to the API.
Date User Action Args
2022-04-11 14:57:58adminsetgithub: 64685
2017-11-07 13:01:57berker.peksagsetstatus: open -> closed
versions: - Python 2.7, Python 3.6
messages: + msg305749

resolution: fixed
stage: patch review -> resolved
2017-11-07 12:58:55berker.peksagsetmessages: + msg305748
2017-10-26 20:06:59berker.peksagsetpull_requests: + pull_request4105
2017-10-26 17:58:04xoviatsetmessages: + msg305075
2017-10-26 05:01:52berker.peksagsetmessages: + msg305022
versions: - Python 3.5
2016-12-27 17:45:02xoviatsetfiles: - Add_ability_to_close_MSI_database_.patch
2016-12-27 17:44:50xoviatsetfiles: + Add_ability_to_close_MSI_database_.patch

messages: + msg284119
2016-12-27 12:27:14berker.peksagsetnosy: + berker.peksag

messages: + msg284089
stage: needs patch -> patch review
2016-12-19 22:26:46xoviatsetfiles: + Add_ability_to_close_MSI_database_.patch
keywords: + patch
2016-12-19 22:26:21xoviatsetfiles: - _msi.c
2016-12-19 22:10:56BreamoreBoysetnosy: - BreamoreBoy
2016-12-19 19:53:09xoviatsetfiles: + _msi.c

messages: + msg283648
2016-12-19 18:20:55steve.dowersetpriority: normal -> low
versions: + Python 3.6, Python 3.7
messages: + msg283641

keywords: + easy
stage: needs patch
2016-12-19 18:01:09xoviatsetnosy: + xoviat

messages: + msg283638
versions: + Python 3.5
2015-02-12 11:27:04BreamoreBoysetnosy: + tim.golden, BreamoreBoy, zach.ware, steve.dower
messages: + msg235809
2014-02-02 23:15:10ned.deilysetnosy: + loewis
2014-02-02 15:37:29gentoo90create