From mhdi.fathipour at gmail.com  Tue Jun  1 02:49:25 2021
From: mhdi.fathipour at gmail.com (Mehdi Fathipour)
Date: Tue Jun  1 08:52:29 2021
Subject: [odb-users] persist problem
Message-ID: <CAJctCgG6WfhYf8h1B8qPgVutqVSy8KASJBOuQf0tOurjGTkJwA@mail.gmail.com>

Dear admin,

I'm new to mysql and I have a problem using odb orm. I'd be so thankful if
you could help me.
I was build and generate odb.lib and odb-mysql.lib correctly, but when I
use it to first 'hello' example, transaction has been established but I
have an exception in persist like:
"Got packet bigger than 'max_allowd_packet' bytes".
I increased the value of  'max_allowd_packet' but I still have the same
error.
How can I solve this problem?
Thank you. Regards
From icewill9999 at vip.qq.com  Tue Jun 22 03:26:07 2021
From: icewill9999 at vip.qq.com (=?gb18030?B?srvD99Xmz+A=?=)
Date: Tue Jun 22 09:35:20 2021
Subject: [odb-users] how to blob an array of float in mysql with odb 2.4.0?
Message-ID: <tencent_92BF3406178FD61ED6603A819F106E2AC706@qq.com>

Hi, Boris,
&nbsp;I have an array of float values and I need to store them into mysql BLOB column, I defined the mapping as below:
typedef std::vector<unsigned char&gt; buffer; #pragma db value(buffer) type("BLOB")
#pragma db section(extras_)    buffer log_data_; // use the section to load the BLOB data
I convert the array of float values into a vector of unsigned char and then store them into the BLOB column. When I read the stored BLOB and convert them back I found only the 64 float values from beginning are correct, which I think is the default size of details::buffer. 
I dug into the odb generated file -odb.cxx, and found the size of buffer was never grown to meet the large size// log_data_    //    if (t[11UL])    {      i.log_data_value.capacity (i.log_data_size);      grew = true;    }so I add the code    if(i.log_data_size &gt;256) t[11UL] =1; it's worked, but all the converted values are wrong.
Is it a bug of ODB 2.4.0 or I did something wrong? please guide me with this, thanks.
Best Regards,Wang
From boris at codesynthesis.com  Wed Jun 23 08:46:35 2021
From: boris at codesynthesis.com (Boris Kolpackov)
Date: Wed Jun 23 08:45:48 2021
Subject: [odb-users] how to blob an array of float in mysql with odb 2.4.0?
In-Reply-To: <tencent_92BF3406178FD61ED6603A819F106E2AC706@qq.com>
References: <tencent_92BF3406178FD61ED6603A819F106E2AC706@qq.com>
Message-ID: <boris.20210623144444@codesynthesis.com>

icewill9999@vip.qq.com writes:

> Is it a bug of ODB 2.4.0 or I did something wrong?

I believe there was a bug in this area. Can you try the latest
pre-release as described in theses instructions and see if you
still have this issue:

https://codesynthesis.com/products/odb/doc/install-build2.xhtml

From icewill9999 at vip.qq.com  Wed Jun 23 00:22:22 2021
From: icewill9999 at vip.qq.com (=?gb18030?B?srvD99Xmz+A=?=)
Date: Wed Jun 23 08:46:03 2021
Subject: =?gb18030?B?u9i4tKO6W29kYi11c2Vyc10gaG93IHRvIGJsb2Ig?=
	=?gb18030?B?YW4gYXJyYXkgb2YgZmxvYXQgaW4gbXlzcWwgd2l0?=
	=?gb18030?B?aCBvZGIgMi40LjA/?=
In-Reply-To: <tencent_92BF3406178FD61ED6603A819F106E2AC706@qq.com>
References: <tencent_92BF3406178FD61ED6603A819F106E2AC706@qq.com>
Message-ID: <tencent_042FC6350FD11EEDA028C1AC90512AF43F06@qq.com>

FYI, I tried another solution you provided in the post&nbsp;[odb-users] Creating BLOBs out of vector/array of doubles? (codesynthesis.com), and the problems remains exactly the same.


Regards,
Wang


------------------&nbsp;????&nbsp;------------------
???:                                                                                                                        "????"                                                                                    <icewill9999@vip.qq.com&gt;;
????:&nbsp;2021?6?22?(???) ??3:26
???:&nbsp;"odb-users"<odb-users@codesynthesis.com&gt;;

??:&nbsp;[odb-users] how to blob an array of float in mysql with odb 2.4.0?



Hi, Boris,
&amp;nbsp;I have an array of float values and I need to store them into mysql BLOB column, I defined the mapping as below:
typedef std::vector<unsigned char&amp;gt; buffer; #pragma db value(buffer) type("BLOB")
#pragma db section(extras_)&nbsp;&nbsp;&nbsp; buffer log_data_; // use the section to load the BLOB data
I convert the array of float values into a vector of unsigned char and then store them into the BLOB column. When I read the stored BLOB and convert them back I found only the 64 float values from beginning are correct, which I think is the default size of details::buffer. 
I dug into the odb generated file -odb.cxx, and found the size of buffer was never grown to meet the large size// log_data_&nbsp;&nbsp;&nbsp; //&nbsp;&nbsp;&nbsp; if (t[11UL])&nbsp;&nbsp;&nbsp; {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i.log_data_value.capacity (i.log_data_size);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; grew = true;&nbsp;&nbsp;&nbsp; }so I add the code&nbsp;&nbsp;&nbsp; if(i.log_data_size &amp;gt;256) t[11UL] =1; it's worked, but all the converted values are wrong.
Is it a bug of ODB 2.4.0 or I did something wrong? please guide me with this, thanks.
Best Regards,Wang
From icewill9999 at vip.qq.com  Wed Jun 23 09:08:54 2021
From: icewill9999 at vip.qq.com (=?utf-8?B?5LiN5piO55yf55u4?=)
Date: Wed Jun 23 09:16:06 2021
Subject: [odb-users] how to blob an array of float in mysql with odb 2.4.0?
References: <tencent_92BF3406178FD61ED6603A819F106E2AC706@qq.com>
	<boris.20210623144444@codesynthesis.com>
Message-ID: <tencent_FB5B088E849252BFFE1730A47938F6960609@qq.com>

thanks for reply, we have a lot of codes developed on odb 2.4.0, are these codes compatible with the latest version? I need to assess the cost of the migration, thanks again.





????iPhone


------------------ Original ------------------
From: Boris Kolpackov <boris@codesynthesis.com&gt;
Date: Wed,Jun 23,2021 8:46 PM
To: icewill9999 <icewill9999@vip.qq.com&gt;
Cc: odb-users <odb-users@codesynthesis.com&gt;
Subject: Re: [odb-users] how to blob an array of float in mysql with odb 2.4.0?



icewill9999@vip.qq.com writes:

&gt; Is it a bug of ODB 2.4.0 or I did something wrong?

I believe there was a bug in this area. Can you try the latest
pre-release as described in theses instructions and see if you
still have this issue:

https://codesynthesis.com/products/odb/doc/install-build2.xhtml
From boris at codesynthesis.com  Wed Jun 23 09:20:29 2021
From: boris at codesynthesis.com (Boris Kolpackov)
Date: Wed Jun 23 09:19:41 2021
Subject: [odb-users] how to blob an array of float in mysql with odb 2.4.0?
In-Reply-To: <tencent_FB5B088E849252BFFE1730A47938F6960609@qq.com>
References: <tencent_92BF3406178FD61ED6603A819F106E2AC706@qq.com>
	<boris.20210623144444@codesynthesis.com>
	<tencent_FB5B088E849252BFFE1730A47938F6960609@qq.com>
Message-ID: <boris.20210623151726@codesynthesis.com>

icewill9999@vip.qq.com writes:

> we have a lot of codes developed on odb 2.4.0, are these codes
> compatible with the latest version?

Yes, you shouldn't normally have any issues migrating from 2.4.0
to 2.5.0. Another alternative would be to look through the change
log of libodb-mysql[1], try to locate the patch that presumably have
fixed this issue, and backport it to 2.4.0.

[1] https://git.codesynthesis.com/cgit/odb/libodb-mysql/log/