QPSQL

QPSQL is a database driver for the Qt framework that allows applications to connect to and interact with PostgreSQL databases. It is part of the Qt SQL module, which provides a consistent API for accessing various database systems. QPSQL uses the PostgreSQL C API to communicate with the database, enabling developers to execute SQL queries, retrieve results, and manage transactions from within their Qt applications.

To use QPSQL, developers typically need to include the Qt SQL module in their project and link against the QPSQL library. The process involves creating a QSqlDatabase object, specifying the database driver as "QPSQL", and then providing connection details such as the database name, host, port, username, and password. Once connected, applications can create QSqlQuery objects to send SQL commands to the PostgreSQL server. These queries can be used for data manipulation (INSERT, UPDATE, DELETE) or data retrieval (SELECT).

The QSqlQuery object allows fetching data row by row or all at once, and individual field values can be accessed by name or index. QPSQL also supports prepared statements, which can improve performance and security by preventing SQL injection vulnerabilities. Transaction management is handled through methods like beginTransaction(), commit(), and rollback(), allowing for atomic operations. Error handling is typically done by checking the boolean return values of query execution methods and inspecting the database object's lastError() method. QPSQL is a widely used component for developers building database-driven applications with the Qt framework that require PostgreSQL backend support.