Qt中连接mysql

1、安装mysql，workbench，为mysql添加环境变量

2、安装Qt带src，然后到如下目录，找到mysql.pro(建议做个副本先)

http://D:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\mysql

mysql.pro

注意路径的 \ / 和双引号的使用，搞不定就照抄

TARGET = qsqlmysqlHEADERS += $$PWD/qsql_mysql_p.h
SOURCES += $$PWD/qsql_mysql.cpp $$PWD/main.cpp#注释掉
#QMAKE_USE += mysqlOTHER_FILES += mysql.jsonPLUGIN_CLASS_NAME = QMYSQLDriverPlugininclude(../qsqldriverbase.pri)#这个主要是添加.h依赖文件使用
INCLUDEPATH+="C:/Program Files/MySQL/MySQL Server 8.0/include"#添加依赖的.lib文件
LIBS+="C:/Program Files/MySQL/MySQL Server 8.0/lib/libmysql.lib"#生成你所需要的dll存放目录
DESTDIR="D:/MYSQL/lib"#路径换成自己的mysql路径

qsqldriverbase.pri

QT  = core core-private sql-private# For QMAKE_USE in the parent projects.
#include($$shadowed($$PWD)/qtsqldrivers-config.pri)
#include(./qsqldriverbase.pri)
include(./configure.pri)PLUGIN_TYPE = sqldrivers
load(qt_plugin)DEFINES += QT_NO_CAST_TO_ASCII QT_NO_CAST_FROM_ASCII

3、编译得到两个dll，

由于在mysql.pro中已经定义目标目录，DESTDIR="D:/MYSQL/lib"

复制到

D:\Qt\Qt5.13.2\5.13.2\mingw73_64\plugins\sqldrivers

复制libmysql.dll到Qt如下bin目录

5、WorkBench创建database和table，Qt项目写代码如下

void Mysql::on_ConnectButton_clicked()
{db = QSqlDatabase::addDatabase("QMYSQL");db.setHostName("127.0.0.1");db.setPort(3306);db.setDatabaseName("jetring");db.setUserName("root");db.setPassword("123456");if(db.open()){ui->textEdit->append("Mysql connect success!");}else{ui->textEdit->append("Mysql connect failed.");ui->textEdit->append("Error: " + db.lastError().text());}
}

连接成功！