Unable to use QMYSQL driver on ArchLinux after migrating to Qt 5.6.0

johnlamericain

@SGaist Yes it did the first time from 10.1.12 to 10.1.13.

But strangely when I rollback only qt5 packages to Qt 5.5.1, then it works again.

SGaist

Can you check the output you get from your application when running it with QT_DEBUG_PLUGINS=1 defined ?

johnlamericain

@SGaist Here is the result:

[dev@preprod binserver]$ export QT_DEBUG_PLUGINS=1
[dev@preprod binserver]$ ./DSServer
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/qt/plugins/sqldrivers" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/sqldrivers/libqsqlibase.so"
Found metadata in lib /usr/lib/qt/plugins/sqldrivers/libqsqlibase.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QIBASE"
        ]
    },
    "className": "QIBaseDriverPlugin",
    "debug": false,
    "version": 329216
}


Got keys from plugin meta data ("QIBASE")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/sqldrivers/libqsqlite.so"
Found metadata in lib /usr/lib/qt/plugins/sqldrivers/libqsqlite.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QSQLITE"
        ]
    },
    "className": "QSQLiteDriverPlugin",
    "debug": false,
    "version": 329216
}


Got keys from plugin meta data ("QSQLITE")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/sqldrivers/libqsqlmysql.so"
Found metadata in lib /usr/lib/qt/plugins/sqldrivers/libqsqlmysql.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QMYSQL3",
            "QMYSQL"
        ]
    },
    "className": "QMYSQLDriverPlugin",
    "debug": false,
    "version": 329216
}


Got keys from plugin meta data ("QMYSQL3", "QMYSQL")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/sqldrivers/libqsqlodbc.so"
Found metadata in lib /usr/lib/qt/plugins/sqldrivers/libqsqlodbc.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QODBC3",
            "QODBC"
        ]
    },
    "className": "QODBCDriverPlugin",
    "debug": false,
    "version": 329216
}


Got keys from plugin meta data ("QODBC3", "QODBC")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/sqldrivers/libqsqlpsql.so"
Found metadata in lib /usr/lib/qt/plugins/sqldrivers/libqsqlpsql.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QPSQL7",
            "QPSQL"
        ]
    },
    "className": "QPSQLDriverPlugin",
    "debug": false,
    "version": 329216
}


Got keys from plugin meta data ("QPSQL7", "QPSQL")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/qt/plugins/sqldrivers/libqsqltds.so"
Found metadata in lib /usr/lib/qt/plugins/sqldrivers/libqsqltds.so, metadata=
{
    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
    "MetaData": {
        "Keys": [
            "QTDS7",
            "QTDS"
        ]
    },
    "className": "QTDSDriverPlugin",
    "debug": false,
    "version": 329216
}


Got keys from plugin meta data ("QTDS7", "QTDS")
QFactoryLoader::QFactoryLoader() checking directory path "/home/dev/binserver/sqldrivers" ...
loaded library "/usr/lib/qt/plugins/sqldrivers/libqsqlmysql.so"
Found metadata in lib /home/dev/binserver/plugins/libdscommunityserver.so, metadata=
{
    "IID": "com.dsbrowser.DSPluginLoaderInterface",
    "MetaData": {
    },
    "className": "DSPluginCommunityServer",
    "debug": false,
    "version": 329216
}

johnlamericain

@SGaist Does that seems correct?

SGaist

At first sight nothing wrong there.

Can you do some test building your own version of the MySQL plugin ?

The plugin hasn't had many commits recently so it might be easy to determine if something broke there between 5.5.1 and 5.6.0

johnlamericain

@SGaist Well I never done it so I don't know where to start?

johnlamericain

@SGaist I also posted on Archlinux without much reply, but the maintainer said it works for him on another project: https://bugs.archlinux.org/task/48778

SGaist

You have to clone the qtbase module and from there you can either use git bisect or since there's only handful of commits, checkout the commit before any that changed the plugin code.

johnlamericain

After further investigation today, this appears to be a bug in Qt, QSqlQuery doesn't work with UNSIGNED values: https://bugreports.qt.io/browse/QTBUG-53237

Hamed.Masafi

This error occurs due to binary intolerance of libmysqlclient version 1.8 and 1.6. Qt used version 1.6 to compile but you have version 1.6 installed.
Solution: make MySql plugin manually.

johnlamericain

@Hamed.Masafi I'm on Archlinux which is a Rolling release, so indeed the version of libmysqlclient update quickly, but I would assume that the people that package qt5-base are compiling Qt with the current version available: https://www.archlinux.org/packages/extra/x86_64/qt5-base/ & https://www.archlinux.org/packages/extra/x86_64/libmariadbclient/