JDBC Tutorials - Herong's Tutorial Examples - Version 3.03, by Dr. Herong Yang
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) 2015, 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:
C:\herong>\Progra~1\java\jdk1.8.0_45\bin\javac LoopResultSet.java C:\herong>\Progra~1\java\jdk1.8.0_45\bin\java -cp .;\local\lib\sqljdbc42.jar LoopResultSet Customers Ken Sanchez Terri Duffy Roberto Tamburello Rob Walters Gail Erickson Jossef Goldberg Dylan Miller Diane Margheim Gigi Matthew Michael Raheem
Last update: 2015.
Table of Contents
JDBC (Java Database Connectivity) Introduction
Installing and Running Java DB - Derby
Derby (Java DB) JDBC DataSource Objects
Java DB (Derby) - DML Statements
Java DB (Derby) - ResultSet Objects of Queries
Java DB (Derby) - PreparedStatement
MySQL JDBC Driver (MySQL Connector/J)
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 - Reference Implementation of JdbcRowSet
Oracle - JBDC CallableStatement
Oracle CLOB (Character Large Object) - TEXT
Oracle BLOB (Binary Large Object) - BLOB
Microsoft SQL Server 2005 Express Edition
Microsoft JDBC Driver for SQL Server - sqljdbc42.jar
►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