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50
51#ifndef CONNECTION_H
52#define CONNECTION_H
53
54#include <QMessageBox>
55#include <QSqlDatabase>
56#include <QSqlError>
57#include <QSqlQuery>
58
59/*
60 This file defines a helper function to open a connection to an
61 in-memory SQLITE database and to create a test table.
62
63 If you want to use another database, simply modify the code
64 below. All the examples in this directory use this function to
65 connect to a database.
66*/
67//! [0]
68static bool createConnection()
69{
70 QSqlDatabase db = QSqlDatabase::addDatabase(type: "QSQLITE");
71 db.setDatabaseName(":memory:");
72 if (!db.open()) {
73 QMessageBox::critical(parent: nullptr, title: QObject::tr(s: "Cannot open database"),
74 text: QObject::tr(s: "Unable to establish a database connection.\n"
75 "This example needs SQLite support. Please read "
76 "the Qt SQL driver documentation for information how "
77 "to build it.\n\n"
78 "Click Cancel to exit."), buttons: QMessageBox::Cancel);
79 return false;
80 }
81
82 QSqlQuery query;
83 query.exec(query: "create table person (id int primary key, "
84 "firstname varchar(20), lastname varchar(20))");
85 query.exec(query: "insert into person values(101, 'Danny', 'Young')");
86 query.exec(query: "insert into person values(102, 'Christine', 'Holand')");
87 query.exec(query: "insert into person values(103, 'Lars', 'Gordon')");
88 query.exec(query: "insert into person values(104, 'Roberto', 'Robitaille')");
89 query.exec(query: "insert into person values(105, 'Maria', 'Papadopoulos')");
90
91 query.exec(query: "create table items (id int primary key,"
92 "imagefile int,"
93 "itemtype varchar(20),"
94 "description varchar(100))");
95 query.exec(query: "insert into items "
96 "values(0, 0, 'Qt',"
97 "'Qt is a full development framework with tools designed to "
98 "streamline the creation of stunning applications and "
99 "amazing user interfaces for desktop, embedded and mobile "
100 "platforms.')");
101 query.exec(query: "insert into items "
102 "values(1, 1, 'Qt Quick',"
103 "'Qt Quick is a collection of techniques designed to help "
104 "developers create intuitive, modern-looking, and fluid "
105 "user interfaces using a CSS & JavaScript like language.')");
106 query.exec(query: "insert into items "
107 "values(2, 2, 'Qt Creator',"
108 "'Qt Creator is a powerful cross-platform integrated "
109 "development environment (IDE), including UI design tools "
110 "and on-device debugging.')");
111 query.exec(query: "insert into items "
112 "values(3, 3, 'Qt Project',"
113 "'The Qt Project governs the open source development of Qt, "
114 "allowing anyone wanting to contribute to join the effort "
115 "through a meritocratic structure of approvers and "
116 "maintainers.')");
117
118 query.exec(query: "create table images (itemid int, file varchar(20))");
119 query.exec(query: "insert into images values(0, 'images/qt-logo.png')");
120 query.exec(query: "insert into images values(1, 'images/qt-quick.png')");
121 query.exec(query: "insert into images values(2, 'images/qt-creator.png')");
122 query.exec(query: "insert into images values(3, 'images/qt-project.png')");
123
124 return true;
125}
126//! [0]
127
128#endif
129

source code of qtbase/examples/sql/connection.h