Looping through ResultSet with res.next()

This section describes how to loop through ResultSet objects with the res.next() method.

If the returning ResultSet Object of a query statement contains multiple rows, you can use res.next() method to loop through each row in the output.

The tutorial Java program below shows you how to loop through the ResultSet to list customer names in Customer table:

/* LoopResultSet.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
 */
import java.sql.*;
public class LoopResultSet {
  public static void main(String [] args) {
    Connection con = null;
    try {

// Obtaining a connection to SQL Server
      con = DriverManager.getConnection(
          "jdbc:sqlserver://localhost\\SQLEXPRESS;"
        + "user=sa;password=HerongY@ng;"
        + "database=AdventureWorks2014");

// Looping through each row
      Statement sta = con.createStatement();
      ResultSet res = sta.executeQuery(
        "SELECT TOP 10 * FROM Person.Person");
      System.out.println("Customers");
      while (res.next()) {
        String firstName = res.getString("FirstName");
        String lastName = res.getString("LastName");
        System.out.println("   "+firstName+" "+lastName);
      }

      con.close();
    } catch (Exception e) {
      System.err.println("Exception: "
        +e.getMessage());
    }
  }
}

If you run this program, you will get something like:

herong> java -cp .:mssql-jdbc-7.4.1.jre12.jar LoopResultSet.java

Customers
   Ken Sanchez
   Terri Duffy
   Roberto Tamburello
   Rob Walters
   Gail Erickson
   Jossef Goldberg
   Dylan Miller
   Diane Margheim
   Gigi Matthew
   Michael Raheem

Table of Contents

 About This Book

 JDBC (Java Database Connectivity) Introduction

 JDK (Java SE) Installation

 Installing and Running Java DB - Derby

 Derby (Java DB) JDBC Driver

 Derby (Java DB) JDBC DataSource Objects

 Java DB (Derby) - DML Statements

 Java DB (Derby) - ResultSet Objects of Queries

 Java DB (Derby) - PreparedStatement

 MySQL Installation on Windows

 MySQL JDBC Driver (MySQL Connector/J)

 MySQL - PreparedStatement

 MySQL - Reference Implementation of JdbcRowSet

 MySQL - JBDC CallableStatement

 MySQL CLOB (Character Large Object) - TEXT

 MySQL BLOB (Binary Large Object) - BLOB

 Oracle Express Edition Installation on Windows

 Oracle JDBC Drivers

 Oracle - Reference Implementation of JdbcRowSet

 Oracle - PreparedStatement

 Oracle - JBDC CallableStatement

 Oracle CLOB (Character Large Object) - TEXT

 Oracle BLOB (Binary Large Object) - BLOB

 Microsoft SQL Server Express Edition

 Microsoft JDBC Driver for SQL Server

Microsoft JDBC Driver - Query Statements and Result Sets

 Commonly Used JDBC Class Methods

 Calling createStatement() and executeQuery

 Receiving ResultSet Objects from executeQuery

 Closing ResultSet Objects - res.close()

Looping through ResultSet with res.next()

 Retrieving Field Values using res.get*() Methods

 Using ResultSetMetaData Objects to List All Fields

 Microsoft JDBC Driver - DatabaseMetaData Object

 Microsoft JDBC Driver - DDL Statements

 Microsoft JDBC Driver - DML Statements

 SQL Server - PreparedStatement

 SQL Server CLOB (Character Large Object) - TEXT

 SQL Server BLOB (Binary Large Object) - BLOB

 JDBC-ODBC Bridge Driver - sun.jdbc.odbc.JdbcOdbcDriver

 JDBC-ODBC Bridge Driver - Flat Text Files

 JDBC-ODBC Bridge Driver - MS Access

 JDBC-ODBC Bridge Driver - MS SQL Server

 Summary of JDBC Drivers and Database Servers

 Additional Tutorial Notes to Be Added

 Outdated Tutorials

 References

 Full Version in PDF/EPUB