Qt 数据库、登陆界面练习代码
*********main.cpp***********
#include <QApplication>
#include <QTextCodec>
#include "sqlite.h"
#include "database.h"
#include "login.h"
int main(int argc,char *argv[])
{
QApplication app(argc,argv);
QTextCodec::setCodecForTr(QTextCodec::codecForName("GBK"));
if(!createConnection())
return 1;
Sqlite sqlite;
Login login;
if(login.exec()==QDialog::Accepted)
{
sqlite.show();
return app.exec();
}
else return 0;
}
********sqlite.h*********
#ifndef SQLITE_H
#define SQLITE_H
#include <QDialog>
class QPushButton;
class QVBoxLayout;
class QTableView;
class QLabel;
class QLineEdit;
class QGridLayout;
class QSqlTableModel;
class Sqlite:public QDialog
{
Q_OBJECT
public:
Sqlite(QWidget *parent = 0);
private slots:
void addButton_clicked();
void delButton_clicked();
void editButton_clicked();
void noEditButton_clicked();
void ascendingButton_clicked();
void descendingButton_clicked();
void findButton_clicked();
void returnTableButton_clicked();
private:
QPushButton *addButton;
QPushButton *delButton;
QPushButton *editButton;
QPushButton *noEditButton;
QPushButton *ascendingButton;
QPushButton *descendingButton;
QVBoxLayout *verticalLayout;
QTableView *tableView;
QLabel *label;
QLineEdit *lineEdit;
QPushButton *findButton;
QPushButton *returnTableButton;
QGridLayout *gridLayout;
QGridLayout *gridLayout2;
QSqlTableModel *model;
};
#endif
*******sqlite.cpp*******
#include <QtGui>
#include <QSqlTableModel>
#include <QSqlError>
#include <QMessageBox>
#include "sqlite.h"
Sqlite::Sqlite(QWidget *parent)
:QDialog(parent)
{
addButton = new QPushButton(tr("
添加记录
"));
delButton = new QPushButton(tr("
删除记录
"));
editButton = new QPushButton(tr("
修改记录
"));
noEditButton = new QPushButton(tr("
撤销修改
"));
ascendingButton = new QPushButton(tr("
按
id
升序排列
"));
descendingButton = new QPushButton(tr("
按
id
降序排列
"));
connect(addButton,SIGNAL(clicked()),this,SLOT(addButton_clicked()));
connect(delButton,SIGNAL(clicked()),this,SLOT(delButton_clicked()));
connect(editButton,SIGNAL(clicked()),this,SLOT(editButton_clicked()));
connect(noEditButton,SIGNAL(clicked()),this,SLOT(noEditButton_clicked()));
connect(ascendingButton,SIGNAL(clicked()),this,SLOT(ascendingButton_clicked()));
connect(descendingButton,SIGNAL(clicked()),this,SLOT(descendingButton_clicked()));
verticalLayout = new QVBoxLayout;
verticalLayout->addWidget(addButton);
verticalLayout->addWidget(delButton);
verticalLayout->addWidget(editButton);
verticalLayout->addWidget(noEditButton);
verticalLayout->addWidget(ascendingButton);
verticalLayout->addWidget(descendingButton);
label = new QLabel(tr("
姓名
:"));
lineEdit = new QLineEdit;
label->setBuddy(lineEdit);
tableView = new QTableView;
model = new QSqlTableModel(this);
model->setTable("student");
model->setEditStrategy(QSqlTableModel::OnManualSubmit);
model->select();
tableView->setModel(model);
findButton = new QPushButton(tr("
查找
"));
returnTableButton = new QPushButton(tr("
返回全表
"));
connect(findButton,SIGNAL(clicked()),this,SLOT(findButton_clicked()));
connect(returnTableButton,SIGNAL(clicked()),this,SLOT(returnTableButton_clicked()));
gridLayout = new QGridLayout;
gridLayout->addWidget(tableView, 0, 0, 1, 2);
gridLayout->addWidget(label, 1, 0, 1, 1);
gridLayout->addWidget(lineEdit, 1, 1, 1, 1);
gridLayout->addWidget(findButton, 2, 0, 1, 1);
gridLayout->addWidget(returnTableButton, 2, 1, 1, 1);
gridLayout2 = new QGridLayout;
gridLayout2->addLayout(gridLayout, 0, 0, 1, 1);
gridLayout2->addLayout(verticalLayout, 0, 1, 1, 1);
setLayout(gridLayout2);
setWindowTitle(tr("QSQLITE"));
}
void Sqlite::addButton_clicked()
{
int rowNum = model->rowCount();
int id = 10;
model->insertRow(rowNum);
model->setData(model->index(rowNum,0),id);
model->submitAll();
}
void Sqlite::delButton_clicked()
{
int curRow = tableView->currentIndex().row();
model->removeRow(curRow);
int ok = QMessageBox::warning(this,tr("
删除
"),tr("
确定删除当前行
?"),QMessageBox::Yes,QMessageBox::No);
if(ok == QMessageBox::No)
{
model->revertAll();
}
else model->submitAll();
}
void Sqlite::editButton_clicked()
{
model->database().transaction();
if(model->submitAll())
{
model->database().commit();
}else{
model->database().rollback();
QMessageBox::warning(this,tr("tableModel"),tr("sjdfk:%1").arg(model->lastError().text()));
}
}
void Sqlite::noEditButton_clicked()
{
model->revertAll();
}
void Sqlite::ascendingButton_clicked()
{
model->setSort(0,Qt::AscendingOrder);
model->select();
}
void Sqlite::descendingButton_clicked()
{
model->setSort(0,Qt::DescendingOrder);
model->select();
}
void Sqlite::findButton_clicked()
{
QString name = lineEdit->text();
model->setFilter(QObject::tr("name = '%1'").arg(name));
model->select();
}
void Sqlite::returnTableButton_clicked()
{
model->setTable("student");
model->select();
}
*********database.h**********
#ifndef DATABASE_H
#define DATABASE_H
#include <QSqlDatabase>
#include <QSqlQuery>
static bool createConnection()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("database.db");
if(!db.open())
return false;
QSqlQuery query;
query.exec(QObject::tr("create table student(id int primary key,name varchar)"));
query.exec("insert into student values(1,'chen')");
query.exec("insert into student values(2,'bo')");
query.exec("insert into student values(3,'qiang')");
return true;
}
#endif
**********login.h********
#ifndef LOGIN_H
#define LOGIN_H
#include <QDialog>
class QLabel;
class QLineEdit;
class QPushButton;
class QGridLayout;
class Login:public QDialog
{
Q_OBJECT
public:
Login(QWidget *parent =0);
private slots:
void on_loginButton_clicked();
private:
QGridLayout *gridLayout;
QGridLayout *gridLayout2;
QLabel *LoginTopLabel;
QLabel *userLabel;
QLineEdit *userLineEdit;
QLabel *pwdLabel;
QLineEdit *pwdLineEdit;
QPushButton *loginButton;
QPushButton *exitButton;
};
#endif
**********login.cpp***********
#include <QtGui>
#include "login.h"
Login::Login(QWidget *parent)
:QDialog(parent)
{
LoginTopLabel = new QLabel(tr("<font color = red><h2><center>
用户登录界
"));
LoginTopLabel->setFrameShape(QFrame::Panel);
LoginTopLabel->setFrameShadow(QFrame::Sunken);
userLabel = new QLabel(tr("
用户姓名
:"));
userLineEdit = new QLineEdit;
userLabel->setBuddy(userLineEdit);
pwdLabel = new QLabel(tr("
用户密码
:"));
pwdLineEdit = new QLineEdit;
pwdLabel->setBuddy(pwdLineEdit);
pwdLineEdit->setEchoMode(QLineEdit::Password);
loginButton = new QPushButton(tr("
登陆
"));
exitButton = new QPushButton(tr("
退出
"));
connect(loginButton,SIGNAL(clicked()),this,SLOT(on_loginButton_clicked()));
connect(exitButton,SIGNAL(clicked()),this,SLOT(close()));
gridLayout = new QGridLayout;
gridLayout->addWidget(LoginTopLabel, 0, 0, 1, 2);
gridLayout->addWidget(userLabel, 1, 0, 1, 1);
gridLayout->addWidget(userLineEdit, 1, 1, 1, 1);
gridLayout->addWidget(pwdLabel, 2, 0, 1, 1);
gridLayout->addWidget(pwdLineEdit, 2, 1, 1, 1);
gridLayout->addWidget(loginButton, 3, 0, 1, 1);
gridLayout->addWidget(exitButton, 3, 1, 1, 1);
gridLayout2 = new QGridLayout;
gridLayout2->addLayout(gridLayout, 0, 0, 1, 1);
setLayout(gridLayout2);
}
void Login::on_loginButton_clicked()
{
if(userLineEdit->text().trimmed()==tr("admin")&&pwdLineEdit->text()==tr("123456"))
accept();
else{
QMessageBox::warning(this,tr("Warning"),tr("user name or password error!"),QMessageBox::Yes);
userLineEdit->clear();
pwdLineEdit->clear();
userLineEdit->setFocus();
}
}