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Qt Remote Database connection

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #5

    Hi,

    To add to my fellow, did you also configure your remote database to accept connection from the outside ?

    IIRC, accounts like root are only available for local connection.

    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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    • dheerendraD dheerendra

      @Tonny said in Qt Remote Database connection:

      112.17.98.18

      Is connectivity to remote server(112.17.98.18) exist ? Can you ping the 112.17.98.18 ? If yes, can you do 'telnet 112.17.98.18 111' from command to check it works. Can you check with some third party tools like DataBase Explorer to connect and query your remote DB ?

      T Offline
      T Offline
      Tonny
      wrote on last edited by
      #6

      @dheerendra Sir when i type the command telnet it shows the error that 'telnet: Unable to connect to remote host: Connection refused'.I don't know what is the problem.Please help me sir

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      • dheerendraD Offline
        dheerendraD Offline
        dheerendra
        Qt Champions 2022
        wrote on last edited by
        #7

        Are you able to do ping to remote server ping 112.17.98.18 ?

        Dheerendra
        @Community Service
        Certified Qt Specialist
        http://www.pthinks.com

        T 1 Reply Last reply
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        • T Offline
          T Offline
          Tonny
          wrote on last edited by
          #8
          This post is deleted!
          1 Reply Last reply
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          • dheerendraD dheerendra

            Are you able to do ping to remote server ping 112.17.98.18 ?

            T Offline
            T Offline
            Tonny
            wrote on last edited by
            #9

            @dheerendra ping command is successfully run,But Telnet is not worked

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            • dheerendraD Offline
              dheerendraD Offline
              dheerendra
              Qt Champions 2022
              wrote on last edited by
              #10

              112.17.98.18 is this in LAN ? Hope there is no firewall etc between your box and 112.17.98.18.
              Since telnet is not able to connect to port 111 are you sure that SQL is running at the port 111 ?

              Dheerendra
              @Community Service
              Certified Qt Specialist
              http://www.pthinks.com

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              • jsulmJ jsulm

                @Tonny said in Qt Remote Database connection:

                But when i connecting the localhost it does not show any error

                And does it connect then?
                Did you try to connect using MySQL client?

                T Offline
                T Offline
                Tonny
                wrote on last edited by
                #11

                @jsulm mysql client?Please give the procedure to connect it.

                jsulmJ 1 Reply Last reply
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                • dheerendraD dheerendra

                  112.17.98.18 is this in LAN ? Hope there is no firewall etc between your box and 112.17.98.18.
                  Since telnet is not able to connect to port 111 are you sure that SQL is running at the port 111 ?

                  T Offline
                  T Offline
                  Tonny
                  wrote on last edited by
                  #12

                  @dheerendra
                  Sir SQL is not running in the port 111.Sql port is 3306 ..

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                  • dheerendraD Offline
                    dheerendraD Offline
                    dheerendra
                    Qt Champions 2022
                    wrote on last edited by
                    #13

                    OK can you check telnet 112.17.98.18 3306 ? Does it work ? If it work, atleast DB is up at that port.

                    Dheerendra
                    @Community Service
                    Certified Qt Specialist
                    http://www.pthinks.com

                    T 1 Reply Last reply
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                    • dheerendraD dheerendra

                      OK can you check telnet 112.17.98.18 3306 ? Does it work ? If it work, atleast DB is up at that port.

                      T Offline
                      T Offline
                      Tonny
                      wrote on last edited by
                      #14

                      @dheerendra sir it shows telnet: Unable to connect to remote host: Connection refused

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                      • dheerendraD Offline
                        dheerendraD Offline
                        dheerendra
                        Qt Champions 2022
                        wrote on last edited by
                        #15

                        If you have access to the DB Server box, can you login to the system. In same system can you try to do telnet <IP> Port#. Just check the configuration of the remote sql server. Is it configured to listen for network connections also ?

                        Dheerendra
                        @Community Service
                        Certified Qt Specialist
                        http://www.pthinks.com

                        T 1 Reply Last reply
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                        • T Tonny

                          @jsulm mysql client?Please give the procedure to connect it.

                          jsulmJ Offline
                          jsulmJ Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by
                          #16

                          @Tonny said in Qt Remote Database connection:

                          mysql client?Please give the procedure to connect it.

                          https://dev.mysql.com/doc/refman/8.0/en/mysql.html

                          https://forum.qt.io/topic/113070/qt-code-of-conduct

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                          • dheerendraD dheerendra

                            If you have access to the DB Server box, can you login to the system. In same system can you try to do telnet <IP> Port#. Just check the configuration of the remote sql server. Is it configured to listen for network connections also ?

                            T Offline
                            T Offline
                            Tonny
                            wrote on last edited by
                            #17

                            @dheerendra Sir error solved.
                            Sir can you please tell me how to sent values through http protocol using qt creator in the REST API
                            please?Is there any solution for that sir

                            jsulmJ 1 Reply Last reply
                            0
                            • dheerendraD Offline
                              dheerendraD Offline
                              dheerendra
                              Qt Champions 2022
                              wrote on last edited by
                              #18

                              What was the issue ? Please provide the details here. It helps others. You can move the issue to SOLVED state.

                              Dheerendra
                              @Community Service
                              Certified Qt Specialist
                              http://www.pthinks.com

                              T 1 Reply Last reply
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                              • dheerendraD dheerendra

                                What was the issue ? Please provide the details here. It helps others. You can move the issue to SOLVED state.

                                T Offline
                                T Offline
                                Tonny
                                wrote on last edited by
                                #19

                                @dheerendra bind address commented. it was 127.0.0.1 (/etc/mysql/mysql.cnf);

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                                • dheerendraD Offline
                                  dheerendraD Offline
                                  dheerendra
                                  Qt Champions 2022
                                  wrote on last edited by
                                  #20

                                  Your server was configured to listen only for local IP address. You tried to connect to server remotely. This was the issue.

                                  Dheerendra
                                  @Community Service
                                  Certified Qt Specialist
                                  http://www.pthinks.com

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                                  • T Tonny

                                    @dheerendra Sir error solved.
                                    Sir can you please tell me how to sent values through http protocol using qt creator in the REST API
                                    please?Is there any solution for that sir

                                    jsulmJ Offline
                                    jsulmJ Offline
                                    jsulm
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #21

                                    @Tonny said in Qt Remote Database connection:

                                    Sir can you please tell me how to sent values through http protocol using qt creator in the REST API

                                    It's Qt not QtCreator. QtCreator is an IDE.
                                    See https://doc.qt.io/qt-5.11/qtnetwork-programming.html

                                    https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                    • W Offline
                                      W Offline
                                      web_betreuer
                                      wrote on last edited by web_betreuer
                                      #22

                                      Mysql or mariadb listen by default to the loopback address 127.0.0.1
                                      you can change this values to the real local networkaddress in
                                      /etc/mysql/ mysqld.cnf

                                      bind-address = 192.178.xx.xx
                                      mysqlx-bind-address = 192.178.xx.xx

                                      restart the sql.
                                      that's it

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