From boris at codesynthesis.com  Mon May  5 09:21:57 2025
From: boris at codesynthesis.com (Boris Kolpackov)
Date: Mon May  5 09:20:18 2025
Subject: [odb-users] points_to not considered as a relationship in view
In-Reply-To: <275381745991679@mail.yandex.ru>
References: <275381745991679@mail.yandex.ru>
Message-ID: <boris.20250505151912@codesynthesis.com>

????? ???????? <danyapat@yandex.ru> writes:

>    The odb compiler does not seem to understand that the pragma
>    "points_to" represents a relationship so it complains it's "unable to
>    find an object relationship"?  when processing db views (compare it
>    with relationships represented by QSharedPointer - our choice by
>    default). Is it a feature or missing functionality?

Can you provide a minimal header that reproduces this?

Potentially related to:

https://github.com/codesynthesis-com/odb/issues/9

P.S.: In the future please include a meaningful subject in your posts.

From danyapat at yandex.ru  Tue May  6 02:14:49 2025
From: danyapat at yandex.ru (=?utf-8?B?0JTQsNC90LjQuyDQn9Cw0YLRgNGD0YjQtdCy?=)
Date: Tue May  6 02:15:08 2025
Subject: [odb-users] points_to not considered as a relationship in view
In-Reply-To: <boris.20250505151912@codesynthesis.com>
References: <275381745991679@mail.yandex.ru>
	<boris.20250505151912@codesynthesis.com>
Message-ID: <233201746512063@mail.yandex.ru>

<div>?</div><div>?</div><div>----------------</div><div>????: ????? ???????? (danyapat@yandex.ru);</div><div>?????: odb-users@codesynthesis.com;</div><div>????: [odb-users] points_to not considered as a relationship in view;</div><div>05.05.2025, 18:20, "Boris Kolpackov" &lt;boris@codesynthesis.com&gt;:</div><blockquote><p>????? ???????? &lt;<a href="mailto:danyapat@yandex.ru" rel="noopener noreferrer">danyapat@yandex.ru</a>&gt; writes:<br />?</p><blockquote>????The odb compiler does not seem to understand that the pragma<br />????"points_to" represents a relationship so it complains it's "unable to<br />????find an object relationship"? when processing db views (compare it<br />????with relationships represented by QSharedPointer - our choice by<br />????default). Is it a feature or missing functionality?</blockquote><p><br />Can you provide a minimal header that reproduces this?<br /><br />Potentially related to:<br /><br /><a href="https://github.com/codesynthesis-com/odb/issues/9" rel="noopener noreferrer">https://github.com/codesynthesis-com/odb/issues/9</a><br /><br />P.S.: In the future please include a meaningful subject in your posts.</p></blockquote>
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From richard.oehlinger at adbsafegate.com  Tue May 13 02:48:30 2025
From: richard.oehlinger at adbsafegate.com (Richard Oehlinger)
Date: Tue May 20 07:14:31 2025
Subject: [odb-users] ODB compiler generates "-.s" file
Message-ID: <PAWPR08MB980615A9FFE4C5E592C14462E497A@PAWPR08MB9806.eurprd08.prod.outlook.com>

Every time we run the ODB compiler v2.5.0 but I've seen it with v2.4.0 aswell. it seems to be generating a `-.s`-file with one line of content:
`        .file   ""`

This is mildly annoying because its next to the source code and pollutes our source checkout.
We have only seen this on our RHEL8 which using stock GCC 8.5 and your ODB binaries.
As far as I remember this was not an issue on our CentOS 7, but we have retired that, so I cannot check.

BR Richard
From boris at codesynthesis.com  Tue May 20 07:13:30 2025
From: boris at codesynthesis.com (Boris Kolpackov)
Date: Tue May 20 07:14:31 2025
Subject: [odb-users] points_to not considered as a relationship in view
In-Reply-To: <233201746512063@mail.yandex.ru>
References: <275381745991679@mail.yandex.ru>
	<boris.20250505151912@codesynthesis.com>
	<233201746512063@mail.yandex.ru>
Message-ID: <boris.20250520131255@codesynthesis.com>

Thanks for the reproducer. Looks like a bug:

https://github.com/codesynthesis-com/odb/issues/13

From Matthias.seiler at stadlerrail.com  Tue May 13 09:37:56 2025
From: Matthias.seiler at stadlerrail.com (Seiler Matthias SIGCH)
Date: Tue May 20 07:16:05 2025
Subject: [odb-users] "Access violation reading location" when querying a view
Message-ID: <DB8P195MB0568AB9C682AD4B9ECCEFF3BEF96A@DB8P195MB0568.EURP195.PROD.OUTLOOK.COM>

Hi Boris,

I have the following view ...

```
#pragma db view query(                  \
    "SELECT TpEntity.Id "               \
    "FROM TpEntity "                    \
    "INNER JOIN Switch "                \
    "ON Switch.TpEntity = TpEntity.Id " \
    "WHERE (?)")
struct TpEntityIdBySwitch {
  unsigned long tpEntityId;
};
```

... which is queried like this:

```
transaction t(db->begin());
auto q = "Switch.Id='" + switchId + "'";
auto viewRes = *db->query_one<TpEntityIdBySwitch>(q);
t.commit();
```

Thus, given a `Switch.Id` (whose table has a foreign key to `TpEntity` on `Switch.TpEntity`), I want to get the value of `TpEntity.Id`. It works fine if the passed ID exists. However, if it does not, I get an "Access violation reading location ...", which I'm not able to catch. How can I go around this issue such that it does not crash, maybe getting "some" result (e.g., NULL or optional) regardless of if the table contains the ID?

Kind regards,
Matthias

From boris at codesynthesis.com  Tue May 20 07:23:24 2025
From: boris at codesynthesis.com (Boris Kolpackov)
Date: Tue May 20 07:21:42 2025
Subject: [odb-users] "Access violation reading location" when querying a
	view
In-Reply-To: <DB8P195MB0568AB9C682AD4B9ECCEFF3BEF96A@DB8P195MB0568.EURP195.PROD.OUTLOOK.COM>
References: <DB8P195MB0568AB9C682AD4B9ECCEFF3BEF96A@DB8P195MB0568.EURP195.PROD.OUTLOOK.COM>
Message-ID: <boris.20250520132140@codesynthesis.com>

Seiler Matthias SIGCH <Matthias.seiler@stadlerrail.com> writes:

> ```
> transaction t(db->begin());
> auto q = "Switch.Id='" + switchId + "'";
> auto viewRes = *db->query_one<TpEntityIdBySwitch>(q);
> t.commit();
> ```
> 
> Thus, given a `Switch.Id` (whose table has a foreign key to `TpEntity`
> on `Switch.TpEntity`), I want to get the value of `TpEntity.Id`. It
> works fine if the passed ID exists. However, if it does not, I get
> an "Access violation reading location ...", which I'm not able to
> catch. How can I go around this issue such that it does not crash,
> maybe getting "some" result (e.g., NULL or optional) regardless of
> if the table contains the ID?

query_one() return a pointer for exactly this reason (which you
then unconditionally derefence). For details see:

https://www.codesynthesis.com/products/odb/doc/manual.xhtml#4.3

From tlytle123 at gmail.com  Wed May 28 14:23:17 2025
From: tlytle123 at gmail.com (Tyler Lytle)
Date: Thu May 29 03:49:48 2025
Subject: [odb-users] Utilizing MySQL Login Paths
Message-ID: <CAFbECJkhCxD4sPbYB7kLgP_OexaCxex4Dfeeg0Ljyhc00tZ6Fw@mail.gmail.com>

Hello ODB!

I am trying to utilize MySQL login path configurations. These are located
in the home directory of the current user in a hidden file named
.mylogin.cnf. It contains an encrypted password and a default
username/hostname. From the command-line, if I simply execute "mysql" and
it will automatically log me into MySQL without specifying a
username/password on the command-line and without a password prompt.

Can I utilize this in any way with the MySQL ODB database class? I tried to
use the constructor that takes strings and a "number of strings" argument
but that doesn't seem to work.

I would actually like to try to connect to MySQL without specifying
anything other than the database to use. However, it looks like ODB
explicitly uses the currently logged in username if no user is specified.

Any help is appreciated.

-- 
Tyler Lytle
E-Mail: tlytle123@gmail.com
From danyapat at yandex.ru  Thu May 29 08:26:25 2025
From: danyapat at yandex.ru (Danya Patrushev)
Date: Thu May 29 08:27:47 2025
Subject: [odb-users] Out of sync documentation
Message-ID: <f226b6cc5422806ec45022879c070334dfe77253.camel@yandex.ru>

There seems to be a discrepancy between the manuals regarding the --
generate-schema-only option.
The odb compiler doc says:

--generate-schema-only
Generate only the database schema. Note that this option is only valid
when generating schema as a standalone SQL file (see --schema-format
for details).
While the odb manual contains ?lines in chapter 13.1 Object Model
Version and Changelog:
The same can be achieved for the embedded schema by instructing the ODB
compiler to generate the database creation code into a separate C++
file (--schema-format?separate):
odb --database pgsql --generate-schema-only --schema-format separate \
--at-once --input-name company person.hxx employee.hxx employer.hxx
From danyapat at yandex.ru  Fri May 30 11:09:35 2025
From: danyapat at yandex.ru (Danya Patrushev)
Date: Fri May 30 11:09:57 2025
Subject: [odb-users] response file support
Message-ID: <1150161748617491@mail.yandex.ru>


   Hi. Is the odb compiler able to handle long lists of input files via a
   response file?
   The odb manual mentions an "options file" but  according to the
   description is intended for passing compiler options only.

   Â