Looping through ResultSet with res.next()

JDBC for SQL Server - Herong's Tutorial Examples

∟Microsoft JDBC Driver - Query Statements and Result Sets

∟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=herong;password=T0pSecret;"
        + "database=AdventureWorks2019");

// 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-9.4.1.jre16.jar LoopResultSet.java

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