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Cannot build MySQL plugin

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  • Christian EhrlicherC Offline
    Christian EhrlicherC Offline
    Christian Ehrlicher
    Lifetime Qt Champion
    wrote on last edited by
    #12

    You did not follow the documentation - you have to run qmake in the sqldrivers subdir...

    Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
    Visit the Qt Academy at https://academy.qt.io/catalog

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    • georgeG george

      Hi kshegunov,
      Although I don't know what the QMAKE_USE += mysql instruction does, I understand that the '#' symbol is for remarks
      I followed your instruction.
      From the command prompt, I am getting no messages, so I opened the project from the creator and there are no errors.
      The compiler output window among other displays something about "win32-msvc", but I've the 64bit version installed:

      20:06:46: Running steps for project mysql...
      20:06:46: Starting: "C:\Qt\5.14.2\msvc2017_64\bin\qmake.exe" C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql\mysql.pro -spec win32-msvc "CONFIG+=debug" "CONFIG+=qml_debug"
      

      In the following image you can see the full compiler output
      alt text
      http://www.mediafire.com/view/vfi179q0efuqh5t/qt%25236.jpg/file
      But if everything is OK, where is the plugin? I searched for a ".dll" file in the subfolders but all they are empty

      kshegunovK Offline
      kshegunovK Offline
      kshegunov
      Moderators
      wrote on last edited by
      #13

      @george said in Cannot build MySQL plugin:

      From the command prompt, I am getting no messages, so I opened the project from the creator and there are no errors.

      You didn't invoke the generated makefile as far as I could see from your screenshot. So I wouldn't expect you to see any messages. ;) After you run the qmake, you do need to call nmake to start things rolling.

      @Christian-Ehrlicher said in Cannot build MySQL plugin:

      You did not follow the documentation - you have to run qmake in the sqldrivers subdir...

      True, but don't lose patience on us. He just tried to follow what I asked, have some faith. ;)

      Read and abide by the Qt Code of Conduct

      1 Reply Last reply
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      • georgeG Offline
        georgeG Offline
        george
        wrote on last edited by george
        #14

        First of all, I would like to thank you for spending your valuable time, reading my posts and try to guide me.
        It is true that I went a step forward. First I ran the vcvarsall.bat (I did not execute this batch file before). I suppose that sets some environment variables, right?
        From the command prompt and in the following directory: "C:/Qt/15.4.2/Src/qtbase/src/sqldrivers" I build the plugin as follows:

        qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/include" MYSQL_LIBDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/lib"
        

        Here is the output:
        alt text
        http://www.mediafire.com/view/swazfssbaa0dg2u/qt%25237.jpg/file
        But what is the next step?
        If I enter:

        nmake sub-mysql
        

        as manual says, I am getting the following errors:

        Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
        Copyright (C) Microsoft Corporation.  All rights reserved.
        
                cd mysql\ && ( if not exist Makefile C:\Qt\5.14.2\msvc2017_64\bin\qmake.exe -o Makefile C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql\mysql.pro ) && "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe" -f Makefile
        
        Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
        Copyright (C) Microsoft Corporation.  All rights reserved.
        
                "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe" -f Makefile.Release all
        
        Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
        Copyright (C) Microsoft Corporation.  All rights reserved.
        
                link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /OPT:REF /INCREMENTAL:NO /DLL /SUBSYSTEM:WINDOWS /VERSION:5.14 /OUT:..\plugins\sqldrivers\qsqlmysql.dll @C:\Users\George\AppData\Local\Temp\nmEA57.tmp
        LINK : fatal error LNK1181: cannot open input file 'lmysql.obj'
        NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\link.EXE"' : return code '0x49d'
        Stop.
        NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe"' : return code '0x2'
        Stop.
        NMAKE : fatal error U1077: 'cd' : return code '0x2'
        Stop.
        
        kshegunovK 1 Reply Last reply
        0
        • georgeG george

          First of all, I would like to thank you for spending your valuable time, reading my posts and try to guide me.
          It is true that I went a step forward. First I ran the vcvarsall.bat (I did not execute this batch file before). I suppose that sets some environment variables, right?
          From the command prompt and in the following directory: "C:/Qt/15.4.2/Src/qtbase/src/sqldrivers" I build the plugin as follows:

          qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/include" MYSQL_LIBDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/lib"
          

          Here is the output:
          alt text
          http://www.mediafire.com/view/swazfssbaa0dg2u/qt%25237.jpg/file
          But what is the next step?
          If I enter:

          nmake sub-mysql
          

          as manual says, I am getting the following errors:

          Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
          Copyright (C) Microsoft Corporation.  All rights reserved.
          
                  cd mysql\ && ( if not exist Makefile C:\Qt\5.14.2\msvc2017_64\bin\qmake.exe -o Makefile C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql\mysql.pro ) && "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe" -f Makefile
          
          Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
          Copyright (C) Microsoft Corporation.  All rights reserved.
          
                  "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe" -f Makefile.Release all
          
          Microsoft (R) Program Maintenance Utility Version 14.16.27035.0
          Copyright (C) Microsoft Corporation.  All rights reserved.
          
                  link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /OPT:REF /INCREMENTAL:NO /DLL /SUBSYSTEM:WINDOWS /VERSION:5.14 /OUT:..\plugins\sqldrivers\qsqlmysql.dll @C:\Users\George\AppData\Local\Temp\nmEA57.tmp
          LINK : fatal error LNK1181: cannot open input file 'lmysql.obj'
          NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\link.EXE"' : return code '0x49d'
          Stop.
          NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\nmake.exe"' : return code '0x2'
          Stop.
          NMAKE : fatal error U1077: 'cd' : return code '0x2'
          Stop.
          
          kshegunovK Offline
          kshegunovK Offline
          kshegunov
          Moderators
          wrote on last edited by
          #15

          @george said in Cannot build MySQL plugin:

          LINK : fatal error LNK1181: cannot open input file 'lmysql.obj'

          Do you by any chance use a statically built Qt? This linker error is rather odd.

          Read and abide by the Qt Code of Conduct

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          • georgeG Offline
            georgeG Offline
            george
            wrote on last edited by
            #16

            @kshegunov said in Cannot build MySQL plugin:

            Do you by any chance use a statically built Qt?

            Hmm... How can I check this?
            I searched my entire hard drive for the file "lmysql.obj", but I found nothing

            kshegunovK 1 Reply Last reply
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            • Christian EhrlicherC Offline
              Christian EhrlicherC Offline
              Christian Ehrlicher
              Lifetime Qt Champion
              wrote on last edited by
              #17

              Please make sure that there are no leftovers in the sqldrivers subdir (best is to remove this subdir and unpack it again) and try again.

              Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
              Visit the Qt Academy at https://academy.qt.io/catalog

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              • georgeG george

                @kshegunov said in Cannot build MySQL plugin:

                Do you by any chance use a statically built Qt?

                Hmm... How can I check this?
                I searched my entire hard drive for the file "lmysql.obj", but I found nothing

                kshegunovK Offline
                kshegunovK Offline
                kshegunov
                Moderators
                wrote on last edited by
                #18

                @george said in Cannot build MySQL plugin:

                I searched my entire hard drive for the file "lmysql.obj", but I found nothing

                Hence I was suspicious. How did you obtain the sources, did you clone them from git or unpacked them from an archive, or maybe installed them through the maintenance tool? Christian's advice is a good one at this point, you want to make sure there are no leftovers because that can break the build.

                Read and abide by the Qt Code of Conduct

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                • georgeG Offline
                  georgeG Offline
                  george
                  wrote on last edited by
                  #19

                  I'll uninstall the Qt entirely and I'll delete the Qt folder.
                  Then, I'll install from scratch the SDK using the online installer (only the MSVC 64 bit compiler)
                  Then I'll let you know since the installation will take some time.

                  kshegunovK 1 Reply Last reply
                  0
                  • georgeG george

                    I'll uninstall the Qt entirely and I'll delete the Qt folder.
                    Then, I'll install from scratch the SDK using the online installer (only the MSVC 64 bit compiler)
                    Then I'll let you know since the installation will take some time.

                    kshegunovK Offline
                    kshegunovK Offline
                    kshegunov
                    Moderators
                    wrote on last edited by
                    #20

                    Sounds like a plan.

                    @george said in Cannot build MySQL plugin:

                    Then, I'll install from scratch the SDK using the online installer (only the MSVC 64 bit compiler)

                    One one note here, make sure that the SDK architecture (and compiler) you select matches the one of your command prompt that you're going to use. I had experienced this cryptic error when I tried to compile the PSQL driver with a 64 bit msvc, while my Qt distro was for 32 bit msvc. I know it sounds silly but it's an easy error to make, and not very obvious if you actually make it.

                    Read and abide by the Qt Code of Conduct

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                    • georgeG Offline
                      georgeG Offline
                      george
                      wrote on last edited by george
                      #21

                      @kshegunov said in Cannot build MySQL plugin:

                      make sure that the SDK architecture (and compiler) you select matches the one of your command prompt that you're going to use

                      I noticed that the installer, creates only those command prompts shortcuts in the windows start menu that they correspond to the compiler versions chosen during the installation.
                      I choose only one compiler to avoid such errors. When I will get better knowledge of how Qt works then, I'll proceed with other compilers too

                      1 Reply Last reply
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                      • georgeG Offline
                        georgeG Offline
                        george
                        wrote on last edited by
                        #22

                        Now I have a fresh installation of Qt in my hard drive
                        Before I start, I am wondering if I have to modify the project file

                        mysql.pro
                        

                        in the following folder:

                        C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql
                        

                        as I did in my first post. I had added the following lines:

                        INCLUEPATH += C:/Program Files/MySQL/MySQL Connector C 6.1/include
                        QMAKE_LIBDIR += C:/Program Files/MySQL/MySQL Connector C 6.1/lib
                        LIBS += -lmysql
                        
                        kshegunovK 1 Reply Last reply
                        0
                        • georgeG george

                          Now I have a fresh installation of Qt in my hard drive
                          Before I start, I am wondering if I have to modify the project file

                          mysql.pro
                          

                          in the following folder:

                          C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql
                          

                          as I did in my first post. I had added the following lines:

                          INCLUEPATH += C:/Program Files/MySQL/MySQL Connector C 6.1/include
                          QMAKE_LIBDIR += C:/Program Files/MySQL/MySQL Connector C 6.1/lib
                          LIBS += -lmysql
                          
                          kshegunovK Offline
                          kshegunovK Offline
                          kshegunov
                          Moderators
                          wrote on last edited by
                          #23

                          @george said in Cannot build MySQL plugin:

                          Before I start, I am wondering if I have to modify the project file

                          You shouldn't.

                          I had added the following lines

                          Don't do that, you provide the paths on the command line, as per the documentation. Don't forget to quote the paths, as they contain spaces.

                          Read and abide by the Qt Code of Conduct

                          1 Reply Last reply
                          2
                          • georgeG Offline
                            georgeG Offline
                            george
                            wrote on last edited by george
                            #24

                            Well, I managed to connect with my database, thanks to all the people they responded to my posts, and especially to you kshegunov
                            alt text

                            The most important reason that I've never used the QT, it is I never manage to connect with a remote database. Now I can use and learn this SDK which I believe it is the most comprehensive SDK around C++, targeting to database applications for my personal needs

                            For people like me who does not have good knowledge around Qt I will post the steps I followed:

                            1. Make a fresh install of Qt BUT only one compiler (if you do not know what are you doing!). I choosed the MSVC 2017 64bit. I installed the QT in C:\Qt
                              alt text
                              alt text

                            2. Install the MySQL Connector . I installed in C:\Program Files\MySQL\MySQL Connector 6.1

                            3. Click on the Windows start menu the shortcut for the command prompt of MSVC 2017 64-bit
                              alt text

                            4. Find in your hard drive the file vcvarsall.bat and execute it (you sould have Microsoft Visual Studio 2017 installed on your hard drive)
                              alt text

                            5. Go to the C:\Qt\5.14.2\Src\qtbase\src\plugins\sqldrivers and execute the following command (according to Qt manual)

                            qmake -- MYSQL_INCDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/include" MYSQL_LIBDIR="C:/Program Files/MySQL/MySQL Connector C 6.1/lib"
                            

                            and then

                            nmake
                            

                            and then

                            nmake install
                            

                            You'll see a lot of output. If everything is OK you should see the following files:
                            qsqlmysql.dll and qsqlmysqld.dll
                            in the folder C:\Qt\5.14.2\msvc2017_64\plugins\sqldrivers (see the first image of this post)

                            1 Reply Last reply
                            2

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