QSqlDatabaseaddDatabase

QSqlDatabaseaddDatabase is a method provided by the Qt framework for establishing a connection to a SQL database. It belongs to the QSqlDatabase class and is crucial for integrating database functionality into Qt applications.

The primary purpose of QSqlDatabaseaddDatabase is to create and return a QSqlDatabase object that represents a connection to a specific database. This method takes two arguments: a connection name and the driver name for the database. The connection name is an arbitrary string used to identify the database connection, allowing multiple connections to be managed simultaneously within an application. The driver name specifies which database driver Qt should use, such as "QSQLITE" for SQLite, "QMYSQL" for MySQL, or "QPSQL" for PostgreSQL.

After calling QSqlDatabaseaddDatabase, the returned QSqlDatabase object is not yet connected. Further configuration is required using methods like setHostName, setDatabaseName, setUserName, and setPassword. Once these parameters are set, the connection can be opened using the open() method. If the method is called with a connection name that already exists, it returns the existing QSqlDatabase object associated with that name. This allows for easy retrieval and management of previously established database connections. It's important to close database connections when they are no longer needed using the close() method to release resources.