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QMYSQL driver not loaded on Ubuntu

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #45

    use the full path:

    @
    root@Gigabyte-Z68P-DS3:/opt/Qt5.2.0/5.2.0/Src/qtbase/src/plugins/sqldrivers/mysql# /opt/Qt5.2.0/5.2.0/gcc_64/bin/qmake “INCLUDEPATH+=/usr/include/mysql” “LIBS+=-L/usr/lib/mysql -lmysqlclient_r” mysql.pro
    @

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    • ? Offline
      ? Offline
      A Former User
      wrote on last edited by
      #46

      Sorry but gives follow message :

      root@Gigabyte-Z68P-DS3:/opt/Qt5.2.0/5.2.0/Src/qtbase/src/plugins/sqldrivers/mysql# /opt/Qt5.2.0/5.2.0/gcc_64/bin/qmake “INCLUDEPATH+=/usr/include/mysql” “LIBS+=-L/usr/lib/mysql -lmysqlclient_r” mysql.pro
      ***Unknown option -lmysqlclient_r”
      Usage: /opt/Qt5.2.0/5.2.0/gcc_64/bin/qmake [mode] [options] [files]

      QMake has two modes, one mode for generating project files based on
      some heuristics, and the other for generating makefiles. Normally you
      shouldn't need to specify a mode, as makefile generation is the default
      mode for qmake, but you may use this to test qmake on an existing project

      Mode:
      -project Put qmake into project file generation mode
      In this mode qmake interprets files as files to
      be built,
      defaults to *; *; *; *.ts; *.xlf; *.qrc
      Note: The created .pro file probably will
      need to be edited. For example add the QT variable to
      specify what modules are required.
      -makefile Put qmake into makefile generation mode (default)
      In this mode qmake interprets files as project files to
      be processed, if skipped qmake will try to find a project
      file in your current working directory

      Warnings Options:
      -Wnone Turn off all warnings; specific ones may be re-enabled by
      later -W options
      -Wall Turn on all warnings
      -Wparser Turn on parser warnings
      -Wlogic Turn on logic warnings (on by default)
      -Wdeprecated Turn on deprecation warnings (on by default)

      Options:

      • You can place any variable assignment in options and it will be *
      • processed as if it was in [files]. These assignments will be parsed *
      • before [files]. *
        -o file Write output to file
        -d Increase debug level
        -t templ Overrides TEMPLATE as templ
        -tp prefix Overrides TEMPLATE so that prefix is prefixed into the value
        -help This help
        -v Version information
        -after All variable assignments after this will be
        parsed after [files]
        -norecursive Don't do a recursive search
        -recursive Do a recursive search
        -set <prop> <value> Set persistent property
        -unset <prop> Unset persistent property
        -query <prop> Query persistent property. Show all if <prop> is empty.
        -cache file Use file as cache [makefile mode only]
        -spec spec Use spec as QMAKESPEC [makefile mode only]
        -nocache Don't use a cache file [makefile mode only]
        -nodepend Don't generate dependencies [makefile mode only]
        -nomoc Don't generate moc targets [makefile mode only]
        -nopwd Don't look for files in pwd [project mode only]
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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #47

        remove -lmysqlclient_r

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        • ? Offline
          ? Offline
          A Former User
          wrote on last edited by
          #48

          Yes , Solved !
          Thank you dear :)

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          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #49

            You're welcome !

            Now that you have the plugin, can you please update the thread title prepending [solved] so other forum users may know a solution has been found :)

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            • M Offline
              M Offline
              Malhar
              wrote on last edited by
              #50

              Hi SGaist,
              i too faced this error and i did ldd libmysqlclient_r.so.16 and installed the dependency but still m getting this error QMYSQL driver not found available drivers QSQLITE.

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #51

                libmysqlclient_r.so.16 is the MySQL client library. What you should test is the Qt driver plugin. But based on available driver list, you don't have the MySQL plugin.

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                • SGaistS SGaist

                  libmysqlclient_r.so.16 is the MySQL client library. What you should test is the Qt driver plugin. But based on available driver list, you don't have the MySQL plugin.

                  M Offline
                  M Offline
                  Malhar
                  wrote on last edited by
                  #52

                  @SGaist ok. Once i faced this problem and i solved installing dependency of .so file.
                  Now what should i do then.

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #53

                    How did you install Qt ?

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                    • M Offline
                      M Offline
                      Malhar
                      wrote on last edited by
                      #54

                      using wget command "http://download.qt.io/archive/qt/5.1/5.1.0/qt-linux-opensource-5.1.0-x86_64-offline.run"

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #55

                        You're aware that the current version is 5.5.1, aren't you ?

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                        • M Offline
                          M Offline
                          Malhar
                          wrote on last edited by
                          #56

                          yes i know about the latest version but my whole development is done on Qt5.1 so i dont want to change the version.

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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #57

                            Then you might have to build the plugin yourself.

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                            • R Offline
                              R Offline
                              ram1111
                              wrote on last edited by ram1111
                              #58

                              Hello SGaist i'm a beginner to Qt.

                              i get and installed Qt 5.7 in x64 edition for ubuntu.
                              I have QTPLUGIN += qsqlmysql and QT += sql in file .pro

                              when i try connect QMYSQL i got Error like :-
                              QSqlDatabase: QMYSQL driver not loaded
                              QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QPSQL QPSQL7
                              QSqlError("", "Driver not loaded", "Driver not loaded")

                              when i do
                              itas02@itas02:/opt/Qt5.7.0/5.7/gcc_64/plugins/sqldrivers$ ldd libqsqlmysql.so
                              i got this
                              itas02@itas02:/opt/Qt5.7.0/5.7/gcc_64/plugins/sqldrivers$ ldd libqsqlmysql.so
                              linux-vdso.so.1 => (0x00007fff17fa3000)
                              libmysqlclient_r.so.16 => not found
                              libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f379c377000)
                              libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007f379c13e000)
                              how to get libmysqlclient_r.so ?

                              when i try to build qmake
                              by
                              $:/src/plugins/sqldrivers/mysql# /home/../Qt5.7/5.7/gcc_64/bin/qmake “INCLUDEPATH+=/usr/include/mysql” “LIBS+=-L/usr/lib/mysql” mysql.pro
                              after entering make command

                              i'm getting like this

                              g++ -c -pipe -O2 -std=gnu++11 -fvisibility=hidden -fvisibility-inlines-hidden -D_REENTRANT -Wall -W -fPIC -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -I/opt/Qt5.7.0/5.7/gcc_64/include -I/opt/Qt5.7.0/5.7/gcc_64/include/QtSql -I/opt/Qt5.7.0/5.7/gcc_64/include/QtCore -I. -I/opt/Qt5.7.0/5.7/gcc_64/mkspecs/linux-g++ -o main.o main.cpp
                              In file included from main.cpp:44:0:
                              ../../../sql/drivers/mysql/qsql_mysql.h:52:19: fatal error: mysql.h: No such file or directory
                              #include <mysql.h>
                              ^
                              compilation terminated.
                              make: *** [main.o] Error 1

                              i have a mysql.h in /usr/include/mysql/

                              please let me know where i'm doing mistake are i missing any step.
                              thanks in advance

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                              0
                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #59

                                How did you install the MySQL development package ?

                                And why are you using two different version of Qt ? You are inspecting one in /opt/ and you seem to be calling qmake from another install of Qt in your home folder.

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                                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                • chawilaC Offline
                                  chawilaC Offline
                                  chawila
                                  wrote on last edited by
                                  #60

                                  Can someone help me here please...

                                  i ran

                                  qmake "INCLUDEPATH+=/usr/local/include" "LIBS+=-L/usr/local/lib -lmysqlclient_r" mysql.pro
                                  

                                  And i got these error:

                                  qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory
                                  
                                  

                                  What should i do?..

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                                  0
                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #61

                                    Please don't highjack other people thread.

                                    You are already getting answers on your other thread here.

                                    And you should use the complete path to the qmake of the version of Qt you are trying to build the plugin for. Without the path, you are calling your distribution installed qmake. Furthermore this one is for Qt 4.

                                    Interested in AI ? www.idiap.ch
                                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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