issues with building QMYSQL plugin

SGaist

Something strange, the wrong standard is selected. Just tested and it used c++1y

mzimmers

Does your project file look like this?

TARGET = qsqlmysql

HEADERS += $$PWD/qsql_mysql_p.h
SOURCES += $$PWD/qsql_mysql.cpp $$PWD/main.cpp

#QMAKE_USE += mysql

OTHER_FILES += mysql.json

PLUGIN_CLASS_NAME = QMYSQLDriverPlugin
include(../qsqldriverbase.pri)

And do your installed mysql packages look more or less like this?

dpkg -l | grep '^ii' | grep mysql
ii  libmysqlclient-dev                    5.5.54-0+deb8u1                      amd64        MySQL database development files
ii  libmysqlclient18:amd64                5.5.54-0+deb8u1                      amd64        MySQL database client library
ii  libmysqlcppconn7                      1.1.3-6                              amd64        MySQL Connector for C++ (library)
ii  libqt5sql5-mysql:amd64                5.3.2+dfsg-4+deb8u2                  amd64        Qt 5 MySQL database driver
ii  mysql-apt-config                      0.8.3-1                              all          Auto configuration for MySQL APT Repo.
ii  mysql-common                          5.7.17-1debian8                      amd64        MySQL Common
ii  mysql-community-source                5.7.17-1debian8                      amd64        MySQL source
ii  mysql-workbench                       6.2.3+dfsg-7                         amd64        MySQL Workbench - a visual database modeling, administration and queuing tool
ii  mysql-workbench-data                  6.2.3+dfsg-7                         all          MySQL Workbench -- architecture independent data
ii  python-mysql.connector                1.2.3-2                              all          pure Python implementation of MySQL Client/Server protocol
mzimmers@debian:~/QtStuff/qtbase/src/plugins/sqldrivers/mysql$

SGaist

Sorry, I was building 5.9 but the project file is the same except that I didn't comment QMAKE_USE in my case.

mzimmers

@SGaist OK, well...this is confounding.

I've also lost my CLI commands for mysql-client and mysql-server. I think when I was uninstalling, I may have lost a few things. Do you think I should install these?

mysql-server | 5.5.54-0+deb8u1 | http://security.debian.org/ jessie/updates/main amd64 Packages
mysql-server | 5.5.54-0+deb8u1 | http://security.debian.org/ jessie/updates/main amd64 Packages

SGaist

Yes, otherwise you won't have a MySQL database available on your machine. Note that you don't need it to build the plugin, really just to provide a database to work with.

mzimmers

SGaist: I'm going to re-do my MySQL installations from scratch, using the notes above. One thing I'm not clear on is, why am I using 5.5.54 instead of 5.7.17? Is it compatibility with the plugin source?

SGaist

AFAIK, 5.5 is the current officially available on jessie. 5.7 is from sid AKA unstable.

mzimmers

Thank you for all of the help, SGaist. I've got a clean installation of the correct version of mysql on my system now, and I believe I'm building correctly (if I manually modify the compiler flags). When I make, I get a file libqsqlmysql.so in qtbase/plugins/sqldrivers. When I do a make install, I get a copy of this file in /opt/Qt/5.8/gcc_64/plugins/sqldrivers. I believe this is the correct behavior. There's also a copy in tTools/QtCreator/libQt/plugins/sqldrivers. I think this got downloaded with Creator.

Oddly, though, the file sizes aren't the same. Does "make install" actually build again, using different compiler options?

I'm going to consider this thread resolved. To summarize:

Make sure you're using the correct version of qmake. Use the full pathname.
When you install the mysql package, make sure you're getting the correct version.
If you'll need a local server, install mysql-server. This will automatically give you mysql-client and some other stuff you will likely need at some point.
In addition to installing mysql-server, you need to install libmysqlclient-dev for some header files.
If you don't already have them, you need to install zlib1g-dev and libssl-dev as well.
If you're not doing this as a super-user, you may not have permissions to build in place, and you'll need to make a private copy first. The "make install" command should create a copy in the correct location.

SGaist

Just a small thing for number 3, you don't need the mysql-server package if you'll be connecting to a remote server. only libmysqlclient-dev.

mzimmers

@SGaist right you are: I reworded it. Thanks.