<![CDATA[How to store binary data to SQL database as nvarbinary?]]>Hi,

I need to store some files to SQL Server database, such as word, excel and pictures. I tried to read binary file data to a QByteArray, but the file contains lots of '\0' byte and this is regarded as the end of the array, so when the QByteArray object can only store a small part of the file, not all the data.
I think I should first read file into a buffer and then insert the buffer's content to database, but i don't know how to do this use a QSqlQuery, can anybody help me, thanks!

Thanks!

]]>https://forum.qt.io/topic/33529/how-to-store-binary-data-to-sql-database-as-nvarbinaryRSS for NodeThu, 18 Jun 2026 01:02:55 GMTFri, 25 Oct 2013 15:26:20 GMT60<![CDATA[Reply to How to store binary data to SQL database as nvarbinary? on Thu, 14 Nov 2013 21:16:17 GMT]]>IIRC, QByteArray handles \0 like any other char, you can verify the size of the array once loaded

]]>https://forum.qt.io/post/204095https://forum.qt.io/post/204095Thu, 14 Nov 2013 21:16:17 GMT<![CDATA[Reply to How to store binary data to SQL database as nvarbinary? on Sat, 26 Oct 2013 01:47:06 GMT]]>I saw this function:
ByteArray QByteArray::fromBase64(const QByteArray & base64);

This needs another QByteArray, and the question still exsits. The input QByteArray will be truncated, and only the part before the first '\0' will be copied to the new QByteArray.

[quote author="SGaist" date="1382728116"]Hi,

You can use base64 encoding for you binary data

Hope it helps[/quote]

]]>https://forum.qt.io/post/201944https://forum.qt.io/post/201944Sat, 26 Oct 2013 01:47:06 GMT<![CDATA[Reply to How to store binary data to SQL database as nvarbinary? on Sat, 26 Oct 2013 01:41:56 GMT]]>Can you tell a lit more please, or giev me a link about this?
I should still use QByteArray to do this, or use other method?

[quote author="SGaist" date="1382728116"]Hi,

You can use base64 encoding for you binary data

Hope it helps[/quote]

]]>https://forum.qt.io/post/201942https://forum.qt.io/post/201942Sat, 26 Oct 2013 01:41:56 GMT<![CDATA[Reply to How to store binary data to SQL database as nvarbinary? on Fri, 25 Oct 2013 19:08:36 GMT]]>Hi,

You can use base64 encoding for you binary data

Hope it helps

]]>https://forum.qt.io/post/201920https://forum.qt.io/post/201920Fri, 25 Oct 2013 19:08:36 GMT