qt 5.15.2连接postgresql9.4数据库功能
执行后显示效果:
bash
"QSQLITE"
"QODBC"
"QODBC3"
"QPSQL"
"QPSQL7"
connected success to postgresql9.4
"admin" "1"
注意事项:
bash
连接postgresql9.4数据库需要copy下列文件到执行程序所在目录下
-----------qt自带的-----------------
qsqlpsqld.dll
-----------postgresql的-------------------
libpq.dll
ssleay32.dll
libeay32.dll
libintl.dll
---------.pro 添加行-------------------
QT += sql
# custom add postgresql .h and .lib file path by hsg
INCLUDEPATH += "D:/PostgreSQL/9.4/include"
LIBS +="D:/PostgreSQL/9.4/lib/libpq.lib"
.pro
bash
QT += core gui opengl 3dcore 3drender 3dinput 3dextras
QT += sql
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
CONFIG += c++17
# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
dialog_fbx2glb.cpp \
dialog_osgb_to_b3dm.cpp \
leftorbitcameracontroller.cpp \
main.cpp \
mainwindow.cpp \
qleftcameracontroller.cpp \
scene.cpp
HEADERS += \
LeftOrbitCameraControllerPrivate.h \
dialog_fbx2glb.h \
dialog_osgb_to_b3dm.h \
leftorbitcameracontroller.h \
mainwindow.h \
qleftcameracontroller.h \
scene.h
FORMS += \
dialog_fbx2glb.ui \
dialog_osgb_to_b3dm.ui \
mainwindow.ui
# custom add postgresql .h and .lib file path by hsg
INCLUDEPATH += "D:/PostgreSQL/9.4/include"
LIBS +="D:/PostgreSQL/9.4/lib/libpq.lib"
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
DISTFILES += \
images/211.ico \
images/Clear2.ico \
images/File.ico \
images/Open.ico \
images/opendir.png \
images/openfile.png \
readme.txt
man.cpp
cpp
#include "mainwindow.h"
#include <QApplication>
#include <QSqlDatabase>
#include <QDebug>
#include <QSqlQuery>
#include <libpq-fe.h>
void printSqlDrivers(); //先定义
void testConnectSQL();
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QCoreApplication::addLibraryPath(QCoreApplication::applicationDirPath() +"/plugins");
//QApplication::addLibraryPath(QApplication::applicationDirPath() +"/plugins");
//MainWindow w;
//w.show();
printSqlDrivers(); //调用
testConnectSQL(); //测试连接postgresql9.4
return a.exec();
}
//后函数实现
void printSqlDrivers()
{
QStringList drivers=QSqlDatabase::drivers();
foreach(QString driver,drivers)
{
qDebug()<<driver;
}
/*
"QSQLITE"
"QODBC"
"QODBC3"
"QPSQL"
"QPSQL7"
*/
//上面输出有QPSQL关键字才能继续操作testConnectSQL()
}
void testConnectSQL()
{
QSqlDatabase db=QSqlDatabase::addDatabase("QPSQL");
db.setHostName("192.168.30.33");
db.setDatabaseName("pg-sys");
db.setPort(5432);
db.setUserName("postgres");
db.setPassword("1");
bool ok=db.open();
if(ok){
//QMessageBox::information(nullptr,"infor","success");
qDebug()<<"connected success to postgresql9.4";
}
else
{
//QMessageBox::information(nullptr,"infor","open failed");
qDebug()<<"open failed";
//报错可能为
//1.copy sql相关的库到可执行目录下,
//或2.db的连接有错误的参数
//或3.qt的psql驱动版本不兼容(需重新编译qt 5.15.2安装自带源码下插件psql.pro工程 需引用psql安装libpq.dll库)
}
QSqlQuery q=db.exec("select * from sys_user order by user_id asc");
while(q.next())
{
QString userId=q.value("user_id").toString();
QString userName=q.value("user_name").toString();
qDebug()<<userName<<" "<<userId;
}
db.close();
}
本blog地址:https://blog.csdn.net/hsg77