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mainwindow.cpp
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mainwindow.cpp
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#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
QString IdContent = "请输入ID";
MainWindow::setLineEditPlaceholderText(ui->idEdit, IdContent);
QString NameContent = "请输入名字";
MainWindow::setLineEditPlaceholderText(ui->nameEdit, NameContent);
QString NumContent = "请输入学号";
MainWindow::setLineEditPlaceholderText(ui->numEdit, NumContent);
QString ScoreContent = "请输入分数";
MainWindow::setLineEditPlaceholderText(ui->scoreEdit, ScoreContent);
MainWindow::createConnection();
if(MainWindow::isDatabaseCreated()){
qDebug() << "database已连接";
}
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_shake_clicked() //窗口抖动
{
MainWindow::shakeWindow(this);
}
void MainWindow::on_exitButton_clicked()
{
this->close();
}
void MainWindow::on_addButton_clicked() //增加操作
{
int id = ui->idEdit->text().toInt();
QString name = ui->nameEdit->text();
int num = ui->numEdit->text().toInt();
int score = ui->scoreEdit->text().toInt();
insertStudent(id, name, score, num);
QMessageBox::information(this, "提示","success");
}
void MainWindow::on_deleteButton_clicked() //删除操作
{
int id = ui->idEdit->text().toInt();
MainWindow::deleteStudent(id);
}
void MainWindow::on_updateButton_clicked() //修改操作
{
int id = ui->idEdit->text().toInt();
QString name = ui->nameEdit->text();
int score = ui->scoreEdit->text().toInt();
int num = ui->numEdit->text().toInt();
MainWindow::updateStudent(id, name, score, num);
QMessageBox::information(this, "提示","success");
}
void MainWindow::on_selectAllButton_clicked() //查询操作
{
MainWindow::queryStudents();
QMessageBox::information(this, "提示","查询所有成功");
}
void MainWindow::on_selectByIdButton_clicked()
{
int id = ui->idEdit->text().toInt();
QString str = MainWindow::getStudentInfoById(id);
ui->showList->append(str);
QMessageBox::information(this, "提示","根据id查询成功!");
}
//创建数据库
void MainWindow::createConnection() {
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("students.db");
if (!db.open()) {
qDebug() << "Error: Unable to open database" << db.lastError();
}
QSqlQuery query;
if (!query.exec("CREATE TABLE IF NOT EXISTS students (id INTEGER PRIMARY KEY, name TEXT, score INTEGER, num INTEGER)")) {
qDebug() << "Error: Unable to create table" << query.lastError();
}
}
// 增加数据
bool MainWindow::insertStudent(int id, const QString &name, int score, int num) {
QSqlQuery query;
query.prepare("INSERT INTO students (id, name, score, num) VALUES (:id, :name, :age, :num)");
query.bindValue(":id", id);
query.bindValue(":name", name);
query.bindValue(":score", score);
query.bindValue(":num", num);
if (!query.exec()) {
qDebug() << "Error: Unable to insert data" << query.lastError();
return false;
}
return true;
}
// 删除数据
bool MainWindow::deleteStudent(int id) {
QSqlQuery query;
query.prepare("DELETE FROM students WHERE id = :id");
query.bindValue(":id", id);
QMessageBox::information(this, "提示","根据id删除成功!");
if (!query.exec()) {
qDebug() << "Error: Unable to delete data" << query.lastError();
return false;
}
return true;
}
// 修改数据
bool MainWindow::updateStudent(int id, const QString &name, int score, int num) {
QSqlQuery query;
query.prepare("UPDATE students SET name = :name, score = :score, num = :num WHERE id = :id");
query.bindValue(":name", name);
query.bindValue(":score", score);
query.bindValue(":id", id);
query.bindValue(":num", num);
if (!query.exec()) {
qDebug() << "Error: Unable to update data" << query.lastError();
return false;
}
return true;
}
// 查询数据
void MainWindow::queryStudents() {
QSqlQuery query("SELECT id, name, score, num FROM students");
while (query.next()) {
int id = query.value(0).toInt();
QString name = query.value(1).toString();
int score = query.value(2).toInt();
int num = query.value(3).toInt();
QString str = "ID: %1, 名字:%2, 成绩: %3, 学号:%4";
str = str.arg(id).arg(name).arg(score).arg(num);
ui->showList->append(str);
qDebug() << "ID:" << id << ", Name:" << name << ", Score:" << score << ",Num:" << num;
}
}
// 检查是否连接
bool MainWindow::isDatabaseCreated() {
QSqlDatabase db = QSqlDatabase::database();
if (db.isOpen()) {
return true;
} else {
return false;
}
}
// 根据id查询
QString MainWindow::getStudentInfoById(int id) {
QSqlDatabase db = QSqlDatabase::database();
if (!db.isOpen()) {
qDebug() << "Error: Database is not open";
return "";
}
QSqlQuery query;
query.prepare("SELECT name, score, num FROM students WHERE id=:id");
query.bindValue(":id", id);
if (!query.exec()) {
qDebug() << "Error: Unable to execute query" << query.lastError();
return "";
}
if (query.next()) {
QString name = query.value(0).toString();
int score = query.value(1).toInt();
int num = query.value(2).toInt();
return QString("名字: %1 ,成绩: %2,分数: %3").arg(name).arg(score).arg(num);
} else {
return "error";
}
}
void MainWindow::shakeWindow(QWidget* window) {
QPropertyAnimation* animation = new QPropertyAnimation(window, "pos");
animation->setDuration(100);
animation->setLoopCount(5);
int originalX = window->pos().x();
int originalY = window->pos().y();
QList<QVariant> xValues;
xValues << originalX - 5 << originalX + 5 << originalX - 5 << originalX + 5 << originalX;
QList<QVariant> yValues;
yValues << originalY << originalY << originalY - 5 << originalY - 5 << originalY;
animation->setKeyValueAt(0, QPoint(originalX, originalY));
animation->setKeyValueAt(0.2, QPoint(xValues.at(0).toInt(), yValues.at(0).toInt()));
animation->setKeyValueAt(0.4, QPoint(xValues.at(1).toInt(), yValues.at(1).toInt()));
animation->setKeyValueAt(0.6, QPoint(xValues.at(2).toInt(), yValues.at(2).toInt()));
animation->setKeyValueAt(0.8, QPoint(xValues.at(3).toInt(), yValues.at(3).toInt()));
animation->setKeyValueAt(1, QPoint(xValues.at(4).toInt(), yValues.at(4).toInt()));
animation->start(QAbstractAnimation::DeleteWhenStopped);
}
void MainWindow::setLineEditPlaceholderText(QLineEdit* lineEdit, QString& placeholderText) {
lineEdit->setPlaceholderText(placeholderText);
lineEdit->setStyleSheet("QLineEdit { color: gray; }");
QObject::connect(lineEdit, &QLineEdit::textChanged, [=]() {
if (lineEdit->text().isEmpty()) {
lineEdit->setStyleSheet("QLineEdit { color: gray; }");
} else {
lineEdit->setStyleSheet("");
}
});
QObject::connect(lineEdit, &QLineEdit::editingFinished, [=]() {
if (lineEdit->text().isEmpty()) {
lineEdit->setStyleSheet("QLineEdit { color: gray; }");
} else {
lineEdit->setStyleSheet("");
}
});
QObject::connect(lineEdit, &QLineEdit::selectionChanged, [=]() {
if (lineEdit->text().isEmpty()) {
lineEdit->setStyleSheet("QLineEdit { color: gray; }");
} else {
lineEdit->setStyleSheet("");
}
});
}