QSqlQueryFirst

QSqlQueryFirst is a method used in the Qt framework, specifically within the Qt SQL module, to retrieve the first record from a result set obtained from a database query. This method is part of the QSqlQuery class, which provides a means to execute and manipulate SQL statements.

When a QSqlQuery object is used to execute a SELECT statement, it returns a result set containing multiple rows of data. The QSqlQueryFirst method allows developers to move the internal pointer of the QSqlQuery object to the first record in this result set. This is particularly useful when you need to process the data starting from the beginning of the result set.

The method does not take any parameters and returns a boolean value. It returns true if the operation is successful and the internal pointer is moved to the first record, and false if the result set is empty or if there is an error.

It is important to note that calling QSqlQueryFirst will reset the internal state of the QSqlQuery object, meaning any previous operations or positions within the result set will be forgotten. This method is typically used in conjunction with other methods such as QSqlQueryNext, QSqlQueryPrevious, and QSqlQueryLast to navigate through the result set.

In summary, QSqlQueryFirst is a straightforward method for positioning the internal pointer of a QSqlQuery object at the first record of a result set, facilitating the retrieval and processing of data from the beginning of the query results.