- #QT SQLITE DATABASE EXAMPLE APK#
- #QT SQLITE DATABASE EXAMPLE ANDROID#
- #QT SQLITE DATABASE EXAMPLE WINDOWS#
In addition to the database, other resource files such as pictures, fonts, etc. The database can be called through the setDatabaseName function after setting the readDatabaseName function. If you have the app, open this app again, the system will also perform it here, will not enter IF, So this sentence is important, that is to avoid opening the program each time, override the DB files included in the App installation package to the specified address. When the app is installed for the first time, it is not there, so the DB does not exist, so I will enter the execution statement.
#QT SQLITE DATABASE EXAMPLE APK#
In the statement Qfile File (" assets:/database/Subjects.db") This file path is exactly what we use in the APK compressed newspapers, the database's file path, read it to the Andrews local file system. With a simple C++ setting function per class (like Hibernate XML mapping file in Java), you have access to the following features. QDebug() << " Error: Failed to connect database. QxOrm library is an Object Relational Mapping (ORM) database library for C++/Qt developers. QFile file( " assets:/database/Subjects.db " ) įile.setPermissions(QFile::ReadOwner| QFile::WriteOwner) ĭtDatabaseName( " Subjects.db " ) If(QSqlDatabase::contains( " qt_sql_default_connection " ))ĭatabase = QSqlDatabase::database( " qt_sql_default_connection " ) ĭatabase = QSqlDatabase::addDatabase( " QSQLITE " ) ĭtDatabaseName(QApplication::applicationDirPath()+ " / "+ dbName) Then you need to add the following statement in the. Then add our database file to the Database folder So you need to modify the.pro file first, so that the system can automatically add our resources to the Assets folder.įirst, create a new folder Database in the same level folder in the.
If there is no relevant resource information in the code, then the packaged apk is still not The resource will be added in. The goal of the example is to insert data from an XML file into a SQLite database.
If you want to look at the sample file before starting this example, you can open it from the following path:In the project catalog android-build folder, there is also an Assets folderīut we directly assign the database to this folder, and finally packaged APK is still not included.īecause the Android-Build folder is regenerated every time it is built, that is, these files are generated according to the configuration information in our code. The example is accompanied by a sample mapping design (.mfd) file.
#QT SQLITE DATABASE EXAMPLE ANDROID#
It can be seen that the APK is still composed of a series of folders, and the resources we need should ultimately be added to these folders (Assets folders), so that the correct resource path can be found when the Android program is run. Here we take a generation of DEBUG APK as an example to see which files are included in the QT release, as shown below APK is essentially a compressed file, so it is also included in the file path.
#QT SQLITE DATABASE EXAMPLE WINDOWS#
Other databases may use a different syntax for this.Qt package android resources and packaging Windows resources, like libraries in Windows, resources, only need to put it in the project file and configure the correct path, you can be read, but after packaging into apk, resources The path and Windows are different, and even the resource files are not added to the APK.įirst let's take a look at the composition of the APK.
The id field’s values are generated automatically by the database, in this case by SQLite.
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