Ubuntu 18.04 编译安装 Qt mysql驱动

Ubuntu 18.04.5 LTS 编译Qt5.14.2 mysql 驱动

1、mysql版本为系统安装的默认版本

mysql -V

2、查看mysql.h文件所在位置

whereis mysql
locate mysql.h

3、查找 libmysqlclient.so 所在路径

locate libmysqlclient.so

4、定位到qt源码目录下mysql驱动的编译路径

导航到本主机的安装路径：

cd /opt/Qt5.14.2/5.14.2/Src/qtbase/src/plugins/sqldrivers/mysql/

修改mysql.pro文件，添加我们刚才找到的mysql相关的 头文件路径 和 链接库路径，修改后的文件如下：

TARGET = qsqlmysql

HEADERS += $$PWD/qsql_mysql_p.h
SOURCES += $$PWD/qsql_mysql.cpp $$PWD/main.cpp

#QMAKE_USE += mysql

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

PLUGIN_CLASS_NAME = QMYSQLDriverPlugin
include(../qsqldriverbase.pri)

5、接下来执行以下命令进行编译mysql驱动

cd ..
sudo /opt/Qt5.14.2/5.14.2/gcc_64/bin/qmake
cd mysql/
sudo /opt/Qt5.14.2/5.14.2/gcc_64/bin/qmake
sudo make

编译安装完成后如下图：

从图中我我们可以看到编译好的文件位于 …/…/…/…/plugins/sqldrivers/libqsqlmysql.so 目录下
接下来把这几个编译生成的文件拷贝到合适的目录下，如下图：

这样编译mysql驱动就完成了

测试程序

qDebug() << QSqlDatabase::drivers();                                     
                                                                         
QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");                   
db.setHostName("localhost");                                             
db.setUserName("root");                                                  
db.setPassword("1234");                                                  
db.setPort(3306);                                                        
db.setDatabaseName("mysql");                                             
                                                                         
qDebug() << (db.open() ? "open db success." : "open db failed.");                                      
                                                                         
QSqlQuery cursor;                                                        
                                                                         
QString query = " SELECT user, host FROM user; ";                        
                                                                         
if (cursor.exec(query)) {                                                
    while (cursor.next()) {                                              
        qDebug() << "user: " << cursor.value("user").toString()          
                 << "host: " << cursor.value("host").toString();         
    }                                                                    
}                                                                        

输出结果

("QSQLITE", "QMYSQL", "QMYSQL3", "QODBC", "QODBC3", "QPSQL", "QPSQL7")
open db success.
user:  "root" host:  "%"
user:  "debian-sys-maint" host:  "localhost"
user:  "mysql.session" host:  "localhost"
user:  "mysql.sys" host:  "localhost"
user:  "root" host:  "localhost"

参考博文：mathzhu win10/win7下Qt5自带mingw32位编译mysql驱动