msilib: can't close opened database

[gentoo90]

BPO	20486
Nosy	@loewis, @tjguk, @berkerpeksag, @zware, @zooba, @xoviat
PRs	bpo-20486: Implement Database.Close() method in msilib #4141
Files	Add_ability_to_close_MSI_database_.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-11-07.13:01:57.607>
created_at = <Date 2014-02-02.15:37:29.664>
labels = ['3.7', 'easy', 'type-bug', 'library', 'OS-windows']
title = "msilib: can't close opened database"
updated_at = <Date 2017-11-07.13:01:57.605>
user = 'https://bugs.python.org/gentoo90'

bugs.python.org fields:

activity = <Date 2017-11-07.13:01:57.605>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2017-11-07.13:01:57.607>
closer = 'berker.peksag'
components = ['Library (Lib)', 'Windows']
creation = <Date 2014-02-02.15:37:29.664>
creator = 'gentoo90'
dependencies = []
files = ['46056']
hgrepos = []
issue_num = 20486
keywords = ['patch', 'easy']
message_count = 11.0
messages = ['209992', '235809', '283638', '283641', '283648', '284089', '284119', '305022', '305075', '305748', '305749']
nosy_count = 7.0
nosy_names = ['loewis', 'tim.golden', 'berker.peksag', 'zach.ware', 'steve.dower', 'gentoo90', 'xoviat']
pr_nums = ['4141']
priority = 'low'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue20486'
versions = ['Python 3.7']

[gentoo90]

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")
    view.Execute(None)
    r1 = view.Fetch()
    r1.SetString(3,"test.txt")
    view.Modify(msilib.MSIMODIFY_UPDATE, r1)
    view.Close()
    db.Commit()
    del db
    db2 = msilib.OpenDatabase('test.msi', msilib.MSIDBOPEN_TRANSACT)

MSIError: 1: 2203 2: test.msi 3: -2147287008

[BreamoreBoy]

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.

[xoviat]

This is still present in Python 3.5. There is no way to unlock the MSI file without killing the Python process first.

[zooba]

Guessing the msiobj_close function in PC/_msi.c ought to be exposed.

Patches welcome.

[xoviat]

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.

[berkerpeksag]

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 http://bugs.python.org/file45971/Add_ability_to_close_MSI_database_.patch
applying http://bugs.python.org/file45971/Add_ability_to_close_MSI_database_.patch
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 https://docs.python.org/devguide/patch.html for details about creating a patch.

[xoviat]

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.

[berkerpeksag]

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?

[xoviat]

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 <report@bugs.python.org>:

Berker Peksag <berker.peksag@gmail.com> 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 <report@bugs.python.org>
<https://bugs.python.org/issue20486\>

---

[berkerpeksag]

New changeset a935654 by Berker Peksag in branch 'master':
bpo-20486: Implement Database.Close() method in msilib (GH-4141)
a935654