#include "sql.h"

sql::sql()
{
    //创建数据库
    QSqlDatabase db =  QSqlDatabase::addDatabase("QSQLITE");    //添加驱动
    db.setDatabaseName("SmartGreenhouse.db");                   //设置库名
    bool ok =  db.open();
    if(!ok){
        qDebug("open failed");
        return ;
    }
    else {
        qDebug()<<"open success";
    }

    //通过db创建表
    //db.exec("create table usr (name text, passwd text); ");


    //通过query创建表
    QSqlQuery query;
    ok =  query.exec("create table if not exists user (id text, name text);");
    if(!ok){
        qDebug("failed to create user table");
    }
    else {
        //        qDebug()<<"create table success";
        qDebug()<<"Student table created successfully";
    }
    ok =  query.exec("create table if not exists Data (temp text, hum text,light text,co2 text);");
    if(!ok){
        qDebug("failed to create Data table");
    }
    else {
        qDebug()<<"Data table created successfully";
    }


    //插入数据库

        /*QString id = ui->lineEdit->text();
        QString name = ui->lineEdit_2->text();


        QString sql = QString("insert into stu values ('%1','%2')").arg(id).arg(name);

        qDebug()<<"sql:"<<sql;

        QSqlQuery query;
        bool ok;
        ok =  query.exec(sql);
        if(!ok){
            qDebug()<<"insert table failed";
        }
        else {
            qDebug()<<"insert table success";
        }*/


    //删除一条记录  根据学号来删除
  /*
        QString id = ui->lineEdit->text();

        QString sql = QString("delete from stu where id='%1'").arg(id);

        qDebug()<<"sql:"<<sql;

        QSqlQuery query;
        bool ok;
        ok =  query.exec(sql);
        if(!ok){
            qDebug()<<"delete table failed";
        }
        else {
            qDebug()<<"delete table success";
        }*/

    //查询数据库

     /*   QString sql = QString("select * from stu;");

        qDebug()<<"sql:"<<sql;

        QSqlQuery query;
        bool ok;
        ok =  query.exec(sql);
        if(!ok){
            qDebug()<<"select table failed";
        }
        else {
            qDebug()<<"select table success";
        }

        while(query.next()){

            qDebug()<< query.value("name").toString();
        }*/
}