Add new file

userwindow.cpp

+#include "userwindow.h"
+#include "ui_userwindow.h"
+
+UserWindow::UserWindow(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::UserWindow)
+{
+    ui->setupUi(this);
+    this->setAttribute(Qt::WA_DeleteOnClose,1);
+
+    table = new ShowTable(this);
+
+    connect(this,SIGNAL(sendata(QSqlDatabase,QString)),table,SLOT(dowork(QSqlDatabase,QString)));
+}
+
+UserWindow::~UserWindow()
+{
+    delete ui;
+}
+
+void UserWindow::getdata(QSqlDatabase db1,QString tablename1) {
+    db = db1;
+    tablename = tablename1;
+}
+
+void UserWindow::on_usrtable_clicked()
+{
+    emit sendata(db,"user");
+    table->show();
+}
+
+
+//根据username查找用户，并将用户放入一张新表单显示到tableview窗口
+void UserWindow::on_find_usr_clicked()
+{
+    QSqlDatabase db2;
+    QSqlQuery sql_query(db2);
+    QString sql = "create table if not exists "
+                  "temtable(id integer primary key autoincrement,"
+                  "username text not NULL ,password text not NULL);";
+    if(!sql_query.exec(sql))
+    {
+        qDebug()<<"creat table ok";
+        return;
+    }
+
+    bool ok;
+    QString text = QInputDialog::getText(this, tr("查询"),
+                                 tr("查找用户"), QLineEdit::Normal,
+                                 tr("请输入用户名"), &ok);
+
+    QString str = QString("SELECT * FROM user WHERE username = '%1'").arg(text);
+    QSqlQuery query(QSqlDatabase::database("HB"));
+    if(!query.exec(str))
+    {
+        qDebug()<<str;
+        qDebug()<<"find failed";
+    }
+    while(query.next())
+    {
+        QString datasql = QString("insert into temtable(username,password) "
+                      "values('%1',%2);").arg(query.value(1).toString()).arg(query.value(2).toString());
+        qDebug() << datasql;
+
+
+        QSqlQuery sql_query(db2);
+        if(!sql_query.exec(datasql))
+        {
+            qDebug() << "插入失败" << sql_query.lastError();
+            return;
+        }
+        qDebug()<< "插入成功";
+        emit sendata(db2,"temtable");
+        table->show();
+
+        datasql = QString("TRUNCATE TABLE temtable");
+        QSqlQuery query(db2);
+        qDebug()<<datasql;
+        if(!query.exec(datasql))
+        {
+            qDebug() << "删除成功" << query.lastError();
+            return;
+        }
+        qDebug()<< "删除成功";
+    }
+
+}
+
+void UserWindow::on_delet_usr_clicked()
+{
+    bool ok;
+    QString text = QInputDialog::getText(this, tr("查询"),
+                                 tr("查找用户"), QLineEdit::Normal,
+                                 tr("请输入用户名"), &ok);
+
+    QString str = QString("DELETE FROM user WHERE username = '%1'").arg(text);
+    QSqlQuery sql_query(db);
+    if(!sql_query.exec(str))
+    {
+        qDebug() << "删除成功" << sql_query.lastError();
+        return;
+    }
+    qDebug()<< "删除成功";
+}
+
+void UserWindow::on_goback_clicked()
+{
+    this->parentWidget()->show();
+    this->close();
+}
+
+void UserWindow::on_updata_usr_clicked()
+{
+    bool ok;
+    QString text = QInputDialog::getText(this, tr("查询"),
+                                 tr("查找用户"), QLineEdit::Normal,
+                                 tr("请输入需要修改的用户"), &ok);
+
+    int ret = QMessageBox::question(this, tr("问题"),
+                                       "修改用户名/密码？(Yes-用户名|No-密码)",
+                                       QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel);
+    if(ret == QMessageBox::Yes )
+    {
+        QString newname = QInputDialog::getText(this, tr("查询"),
+                                     tr("查找用户"), QLineEdit::Normal,
+                                     tr("请输入要修改的用户名"), &ok);
+
+        QString str = QString("UPDATE user SET username = '%1' WHERE username = '%2'").arg(newname).arg(text);
+        QSqlQuery sql_query(db);
+        if(!sql_query.exec(str))
+        {
+            qDebug() << "修改成功" << sql_query.lastError();
+            return;
+        }
+        qDebug()<< "修改成功";
+    }
+
+    if(ret == QMessageBox::No)
+    {
+        QString newpassword = QInputDialog::getText(this, tr("查询"),
+                                     tr("查找用户"), QLineEdit::Normal,
+                                     tr("请输入需要修改的密码"), &ok);
+
+        QString str = QString("UPDATE user SET password = '%1' WHERE username = '%2'").arg(newpassword).arg(text);
+        QSqlQuery sql_query(db);
+        if(!sql_query.exec(str))
+        {
+            qDebug() << "修改成功" << sql_query.lastError();
+            return;
+        }
+        qDebug()<< "修改成功";
+    }
+}