one,

The VIP channel can follow me, private message me, directly send two dynamic libraries, and take off directly.

1. Check sources when installing Qt
Check mingw and sources

2. Configure the path environment variable
① This computer->Properties->Advanced system settings->Environment variables
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② Double-click the path->Create new in the upper right corner

③ Add these two paths, and finally confirm

3. Compile the mysql driver (open the mysql.pro file in Qt)
1) Find the mysql.pro file in this path D:\QT5.14.2\5.14.2\Src\qtbase\src\plugins\sqldrivers\mysql
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Double-click the mysql.pro file

2) Copy this string of code

TARGET = qsqlmysql
HEADERS += $$PWD/qsql_mysql_p.h
SOURCES += $$PWD/qsql_mysql.cpp $$PWD/main.cpp
#QMAKE_USE += mysql  #！！注意要注释掉
OTHER_FILES += mysql.json
PLUGIN_CLASS_NAME = QMYSQLDriverPlugin
# ！！你安装的mysql的lib路径
LIBS += -L $$quote(C:/Program Files/MySQL/MySQL Server 8.0/lib) -llibmysql
# ！！你安装的mysql的include路径
INCLUDEPATH += $$quote(C:/Program Files/MySQL/MySQL Server 8.0/include)
# ！！你安装的mysql的include路径
DEPENDPATH += $$quote(C:/Program Files/MySQL/MySQL Server 8.0/include)


include(../qsqldriverbase.pri)

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3) Replace the path corresponding to mysql, and then compile it
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After compiling, we can find a plugins folder in the same directory of Qt
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Double-click plugins, we find qsqlmysql.dll

4. Copy the dynamic library
(1) Copy the generated qsqlmysql.dll to the sqldrivers of mingw
and put it under this directory D:\QT5.14.2\5.14.2\mingw73_64\plugins\sqldrivers
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(2) Copy the dynamic library mysql.dll of mysql to the bin of mingw
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In this way, the configuration of our Qt connection to MySQL is complete!

Second, the next step is to enter Qt

1. In the pro file + sql
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2. Add the header file

3. Enter the code (provided that you have created a data name in advance).

QSqlDatabase db=QSqlDatabase::addDatabase("QMYSQL");//添加驱动
    db.setHostName("127.0.0.1");//ip地址
    db.setDatabaseName("stu");//数据库名
    db.setUserName("root");//用户名
    db.setPassword("123456");//密码

    if (db.open())
    {
    
    
        qDebug()<<"open successful";  //如果连接成功打印 open successful

    }
    else
    {
    
    
        qDebug()<<"error"; //连接失败打印error
    }

If you can get here, then OK, congratulations on your success!

Qt connects to MySQL database (nanny level success version tutorial)

one,

Second, the next step is to enter Qt

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