#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "QtSql/QSqlDatabase"
#include "QMessageBox"
#include "qdebug.h"
#include <QSqlError>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QTime>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
db.setHostName("127.0.0.1");
db.setPort(3306);
db.setDatabaseName("MyDataBaseName"); //不是Database,记得别填错
db.setUserName("root");
db.setPassword("root");
bool ok = db.open();
if (ok){
QMessageBox::information(this, "infor", "link success");
}
else {
QMessageBox::information(this, "infor", "link failed");
qDebug()<<"error open database because"<<db.lastError().text();
}
}
void MainWindow::on_pushButton_2_clicked()
{
QSqlQuery query;
QString sql1 = "create table ChannelValues1(id int ,name varchar(100),Ch1 double(64,5),Ch2 double(64,5));";
query.exec(sql1);
}
void MainWindow::on_pushButton_3_clicked()
{
QTime time;
time.start();
for(int i=0;i<500*10000;i++)
{
int id = 0;
QString name = "aaa";
double Ch1 = 9.999;
double Ch2 = 8887.987666652;
QString sql = QString("insert into ChannelValues1(id,name,Ch1,Ch2) values('%1','%2','%3','%4')").arg(id).arg(name).arg(Ch1).arg(Ch2);
QSqlQuery query;
query.exec(sql);
}
qDebug()<<"耗时"+time.elapsed()<<"毫秒";
}
void MainWindow::on_pushButton_4_clicked()
{
int id =0;
QString sql = QString("delete from ChannelValues1 where id = '%1'").arg(id);
QSqlQuery query;
query.exec(sql);
}
void MainWindow::on_pushButton_5_clicked()
{
QSqlQuery q;
q.exec("select *from ChannelValues1");
while(q.next()) //遍历完为false
{
//以下标
//qDebug()<<q.value(0).toInt()<<q.value(1).toString()<<q.value(2).toInt()
// <<q.value(3).toInt();
//以字段
qDebug()<<q.value("id").toInt()<<q.value("name").toString()<<q.value("Ch1").toDouble()
<<q.value("Ch2").toDouble();
}
}
void MainWindow::on_pushButton_6_clicked()
{
QSqlQuery query;
QString sql1 = "DROP table ChannelValues1";
query.exec(sql1);
}
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