QSqlQueryPrevious

QSqlQueryPrevious is a method belonging to the QSqlQuery class in the Qt framework. This method is used to move the query cursor to the previous row in the result set of a database query. When a QSqlQuery object executes a SELECT statement, it returns a result set that can be navigated. By default, the cursor is positioned before the first row. Calling QSqlQueryPrevious attempts to reposition the cursor to the row immediately preceding its current position.

If the current row is the first row, calling QSqlQueryPrevious will result in the cursor being positioned before the first row, and the method will return false. Similarly, if there are no rows in the result set, calling QSqlQueryPrevious will also return false. The method returns true if the cursor was successfully moved to a valid previous row. This allows for bidirectional traversal of query results, which can be useful in various database interaction scenarios where iterating backward is necessary. It is important to check the return value of QSqlQueryPrevious to ensure that a valid previous row was found before attempting to access its data.