QSqlQueryModel

QSqlQueryModel is a class in the Qt framework that provides a read-only data model for SQL result sets. It is part of the Qt SQL module, which allows for database access and manipulation using SQL queries. The QSqlQueryModel class is designed to work with SQL databases and provides a convenient way to display the results of SQL queries in a Qt model/view architecture.

The primary function of QSqlQueryModel is to execute an SQL query and store the result set in a model. This model can then be used with various Qt views, such as QTableView, QListView, or QTreeView, to display the data in a user interface. The model automatically updates when the underlying data changes, ensuring that the displayed data remains consistent with the database.

One of the key features of QSqlQueryModel is its ability to handle large result sets efficiently. It uses a lazy loading mechanism, where data is only fetched from the database when it is needed for display. This helps to minimize memory usage and improve performance, especially when dealing with large datasets.

QSqlQueryModel also supports sorting and filtering of the result set. Users can specify sorting criteria and filter conditions to customize the displayed data. This makes it a versatile tool for building data-driven applications with Qt.

In summary, QSqlQueryModel is a powerful and efficient class for working with SQL result sets in Qt applications. It provides a straightforward way to execute queries, manage result sets, and display data in a user interface. Its integration with the Qt model/view architecture makes it a valuable tool for developers building data-driven applications.