Where does a Resultset object's cursor initially point? How do you move the cursor forward in the result set?

Short Answer

Expert verified
Answer: A ResultSet object's cursor initially points before the first row of the result set, indicating that it doesn't yet point to any row. To move the cursor forward, you can use the 'next()' method of the ResultSet object. This method returns a boolean value, indicating whether there is a next row available or not, and if available, the cursor moves to that row.

Step by step solution

01

Understanding the ResultSet object

A ResultSet object represents the result of executing a SQL query in a Java application. It allows you to retrieve the data returned by the query and to iterate through the rows of the result set.
02

Initial position of the ResultSet cursor

When a ResultSet object is created, its cursor is initially positioned before the first row of the result set, meaning it doesn't yet point to any row. You will need to move the cursor to the first row (if data is available) to start processing the data.
03

Moving the cursor forward

To move the cursor forward through the result set, you use the 'next()' method of the ResultSet object. The 'next()' method returns a boolean value, indicating whether there is a next row available or not. If the next row is available, the cursor moves to that row; otherwise, it remains at its current position. Here's an example of how to use the 'next()' method: ```java ResultSet resultSet = statement.executeQuery("SELECT * FROM students"); while(resultSet.next()) { // retrieve and process data from the current row using resultSet methods } ``` In this example, the 'while' loop continues to iterate until there are no more rows left in the ResultSet, and the 'next()' method returns false. During each iteration, you can access the data in the current row using various ResultSet methods such as 'getString()', 'getInt()', etc., depending on the data type of the columns.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Study anywhere. Anytime. Across all devices.

Sign-up for free