CODEWITHSUNDEEP
c++qtsqliteqtableviewqtsql
Jordan
Jordan

Reputation: 27

How do I display a SQLite table in a QTableView

I am trying to connect to a local database and show a table in QTableView. I am currently getting a connection to my database but whenever I try to append my query to the QTableView box i am getting QSqlError("", "Unable to find table projects", ""). When I run SELECT * FROM projects in DB browser for SQLite, the entry I have in that table shows up. Here is my mainwindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "purchaseorder.h"
#include <QtSql>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    PurchaseOrder *newpo = new PurchaseOrder();

    QSqlDatabase db;

    bool openDB(){
        db = QSqlDatabase::addDatabase("QSQLITE");
        db.setDatabaseName("projectmanager.db");

        if(!db.open())
        {
            qDebug()<<"Error opening database" << db.lastError();
            return false;
        }else{
            qDebug()<<"Connection Established.";
            return true;
        }
    }

    void closeDB(){
        db.close();
        //db.removeDatabase(QSqlDatabase::defaultConnection);
    }

private slots:
    void on_actionProject_2_triggered();

private:
    Ui::MainWindow *ui;
    PurchaseOrder purchaseorder;
};

#endif // MAINWINDOW_H

Here is a snippet of my mainwindow.cpp:

#include "mainwindow.h"
#include <QDebug>
#include <QSqlQueryModel>
#include <QtSql>

void MainWindow::on_actionProject_2_triggered()     // Load PROJECT table
{
    QSqlTableModel* modal = new QSqlTableModel();
    MainWindow conn;

    conn.openDB();

    modal->setTable("projects");
    modal->select();
    ui->tableView->setModel(modal);
    qDebug()<<modal->lastError();

    conn.close();
}

I believe everything is working up until. modal->setTable("projects"); Also I have my projectmanager.db file stored in /db/projectmanager.db but when I put that in my db path it does not connect but it will connect the way I have it? Thank you for any help, all is appreciated.

Desc. of projects:

CREATE TABLE `projects` ( `project_id` INTEGER PRIMARY KEY AUTOINCREMENT,   
`project_name` TEXT,
`client` INTEGER,
`lead_employee` INTEGER,
`description` TEXT,
`start_date` TEXT,
`deadline` TEXT,
`status` INTEGER )

Upvotes: 1

Views: 2190

Answers (1)

eyllanesc
eyllanesc

Reputation: 243897

You have to open the connection before creating the model, on the other hand it is not necessary to create another MainWindow, so the solution is:

void MainWindow::on_actionProject_2_triggered()
{
    openDB();
    QSqlTableModel *modal = new QSqlTableModel;
    modal->setTable("projects");
    modal->select();
    ui->tableView->setModel(modal);
    closeDB();
}

Upvotes: 1

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