報錯： QMYSQL driver not loaded
報錯：無 QMYSQL

使用
QStringList drivers = QSqlDatabase::drivers(); //獲取現在可用的數據庫驅動
foreach(QString driver, drivers)
qDebug() << driver;

“QSQLITE”
“QMARIADB”
“QMYSQL”
“QMYSQL3”
“QODBC”
“QODBC3”
“QPSQL”
“QPSQL7”

解決方法：
1.安裝mysql去官網下載

修改配置我的在這：D:\qt5.15\setup\5.15.2\Src\qtbase\src\plugins\sqldrivers\mysql、mysql.pro

TARGET = qsqlmysqlHEADERS += $$PWD/qsql_mysql_p.h
SOURCES += $$PWD/qsql_mysql.cpp $$PWD/main.cpp#QMAKE_USE += mysqlOTHER_FILES += mysql.jsonPLUGIN_CLASS_NAME = QMYSQLDriverPlugin
include(../qsqldriverbase.pri)LIBS += -LD:\qt5.15\setup\mysql-8.1.0-winx64\lib -llibmysql
INCLUDEPATH += D:\qt5.15\setup\mysql-8.1.0-winx64\include
DEPENDPATH += D:\qt5.15\setup\mysql-8.1.0-winx64\includeDESTDIR=$$PWD/buidld

修改上級目錄中qsqldriverbase.pri：

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

編譯生成：

把它們放入：（我都放進去了，不然很煩）
D:\qt5.15\setup\5.15.2\msvc2019_64\bin
D:\qt5.15\setup\5.15.2\msvc2019_64\lib
D:\qt5.15\setup\5.15.2\msvc2019_64\plugins\sqldrivers

然后把mysql配置到環境變量里：

D:\qt5.15\setup\mysql-8.1.0-winx64\bin
D:\qt5.15\setup\mysql-8.1.0-winx64\lib