qt学习记录

main.cpp

#include "display_da.h"
#include <QtGui/QApplication>

int main(int argc, char *argv[])
{
//  QApplication::addLibraryPath("./plugins");
    QApplication a(argc, argv);
    display_da w;
    w.show();
    return a.exec();
}

sql_interface.h

#ifndef SQL_INTERFACE_H
#define SQL_INTERFACE_H

#include <QString>
#include <QtCore>
#include <QtSql/QSqlDatabase>
#include <QtSql/QSqlQueryModel>
#include <QtGui/QMessageBox>
#include <qtableview.h>
#include <QtGui/QComboBox>
#include <qsqlerror.h>

class SqlClass : public QObject
{
    Q_OBJECT

private:
    QSqlDatabase* db;
    QString db_driver,host_name,db_name,user_name,pass_word;

public:
            SqlClass(QObject* parent = 0,
                QString Driver = "QODBC",QString HostName = "172.18.19.16",QString DbName = "db_wuliu",QString UserName = "sa",QString PassWd = "903198975");
    virtual ~SqlClass();

public:
    void query_sql(QComboBox *);
};
#endif  //SQL_INTERFACE_H

sql_interface.cpp

#include "sql_interface.h"

SqlClass::SqlClass(QObject* parent /* = 0 */, QString Driver /* = "QMYSQL" */,QString HostName /* = "localhost" */,QString DbName /* = "weixin_db" */,QString UserName /* = "root" */,QString PassWd /* = "123123" */) : QObject(parent),db_driver(Driver),host_name(HostName),db_name(DbName),user_name(UserName),pass_word(PassWd)
{
    db = &QSqlDatabase::addDatabase(db_driver);

    if( !db->isValid() ){
        qDebug()<< db->lastError().text();
    }

    db->setHostName(host_name);
    db->setDatabaseName("DRIVER={SQL SERVER};SERVER="+host_name+";DATABASE="+db_name);
    db->setUserName(user_name);
    db->setPassword(pass_word);

    if( !db->open() ){
        QMessageBox::warning(NULL,"database error","Cannot open DB",QMessageBox::Cancel);
    }
    else{
        QMessageBox::information(NULL,"connected database","please chose the game version",QMessageBox::Ok);
    }
}

void SqlClass::query_sql(QComboBox *need_add)
{
    QSqlQueryModel* result_model = new QSqlQueryModel();
    const QSqlDatabase& database= *db;
    result_model->setQuery("SELECT * from dbo.t_user",database);
    qDebug()<<database.lastError().text();
    need_add->setModel(result_model);
}

SqlClass::~SqlClass()
{
}

display_da.h

#ifndef DISPLAY_DA_H
#define DISPLAY_DA_H

#include <QtGui/QMainWindow>
#include "ui_display_da.h"
#include "sql_interface.h"

class display_da : public QMainWindow
{
    Q_OBJECT

private:
    Ui::display_daClass ui;
    SqlClass* mainSql;

public:
    display_da(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~display_da();
};

#endif // DISPLAY_DA_H

display_da.cpp

#include "display_da.h"

display_da::display_da(QWidget *parent, Qt::WFlags flags)
    : QMainWindow(parent, flags)
{
    ui.setupUi(this);
    mainSql = new SqlClass(this);
    mainSql->query_sql(ui.select_gv_combo);
}

display_da::~display_da()
{

}

效果：