How to install mysql under Ubuntu18.04 and use QT to successfully compile the driver

Development environment: Ubuntu18.04+QT5.14.2+MySQL5.7.240

Compilation steps:

1. Install mysql software and driver:

Open the terminal command and execute the installation statement as follows:
sudo apt-get install mysql-server
sudo apt-get install mysql-client sudo apt-get install libmysqlclient-dev
sudo apt-get install libmysql++

 2. Query the installed path:

whereis mysql.h

3. How to set access permissions for project files in the QT installation directory
sudo chmod -R 777 /opt/Qt5.14.2/5.14.2/Src/qtbase/src/ plugins/sqldrivers
sudo chmod -R 777 /opt/Qt5.14.2/5.14.2/Src/qtbase/src/plugins/sqldrivers/mysql/mysql.pro
sudo chmod -R 777 /opt/Qt5.14.2/5.14.2/gcc_64
sudo chmod -R 777 /opt/Qt5.14.2/Tools/QtCreator

4. In the terminal command window, enter sudo /opt/Qt5.14.2/Tools/QtCreator/bin/qtcreator and press Enter to open the QtCreator software with administrator privileges.

 

5. In the QtCreator software, open the mysql project/opt/Qt5.14.2/5.14.2/Src/qtbase/src/plugins/sqldrivers/mysql/mysql.pro project file.

6. Modify the content of the mysql.pro file to
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)

INCLUDEPATH+=/usr/include/mysql
LIBS+=-L/usr/lib/x86_64-linux-gnu/ -lmysqlclient
DESTDIR = ./x86_64-linux-gnu/lib

7. Modify the content of the qsqldriverbase.pri file to
QT = core core-private sql-private

# For QMAKE_USE in the parent projects.
# include($$shadowed($$PWD)/qtsqldrivers-config.pri)
include(./configure.pri)

PLUGIN_TYPE = sqldrivers
load(qt_plugin)

DEFINES += QT_NO_CAST_TO_ASCII QT_NO_CAST_FROM_ASCII

 8. After compiling and running the mysql.pro project in Release mode, it will be produced in the /opt/Qt5.14.2/5.14.2/Src/qtbase/src/plugins/sqldrivers/mysql/Release/x86_64-linux-gnu/lib directory. Corresponding driver files: libqsqlmysql.so, libqsqlmysql.so.debug. Copy the two driver files to the /opt/Qt5.14.2/5.14.2/gcc_64/plugins/sqldrivers directory.

 9. After creating a new test QT project, test the MYSQL database connection. The test code is as follows:

#include <QApplication>
#include <QSqlDatabase>
#include <QDebug>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    // 查看数据库驱动名字
    qDebug()<<QSqlDatabase::drivers();
    // 加载驱动mysql数据库驱动
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    //本机数据库
    db.setHostName("192.168.1.200");
    db.setUserName("root");
    db.setPassword("123456");
    db.setDatabaseName("test");
    db.setPort(3306);
    if(!db.open())
    {
        qDebug()<< "服务器连接失败，请稍后重新尝试";
    }
    else
    {
        qDebug()<< "服务器连接成功，进行后续数据库增删改查操作";
    }
    // 关闭数据库
    db.close();
    return a.exec();
}