sqlcontactmodel.cpp Example File | Qt Quick Controls 5.12.12

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# sqlcontactmodel.cpp Example File

chattutorial/chapter4-models/sqlcontactmodel.cpp

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     #include "sqlcontactmodel.h"

     #include <QDebug>
     #include <QSqlError>
     #include <QSqlQuery>

     static void createTable()
     {
         if (QSqlDatabase::database().tables().contains(QStringLiteral("Contacts"))) {
             // The table already exists; we don't need to do anything.
             return;
         }

         QSqlQuery query;
         if (!query.exec(
             "CREATE TABLE IF NOT EXISTS 'Contacts' ("
             "   'name' TEXT NOT NULL,"
             "   PRIMARY KEY(name)"
             ")")) {
             qFatal("Failed to query database: %s", qPrintable(query.lastError().text()));
         }

         query.exec("INSERT INTO Contacts VALUES('Albert Einstein')");
         query.exec("INSERT INTO Contacts VALUES('Ernest Hemingway')");
         query.exec("INSERT INTO Contacts VALUES('Hans Gude')");
     }

     SqlContactModel::SqlContactModel(QObject *parent) :
         QSqlQueryModel(parent)
     {
         createTable();

         QSqlQuery query;
         if (!query.exec("SELECT * FROM Contacts"))
             qFatal("Contacts SELECT query failed: %s", qPrintable(query.lastError().text()));

         setQuery(query);
         if (lastError().isValid())
             qFatal("Cannot set query on SqlContactModel: %s", qPrintable(lastError().text()));
     }