JDBC Tutorials - Herong's Tutorial Examples - v3.12, by Dr. Herong Yang
Scrollable ResultSet and Moving Cursor Backward
This section describes how to set ResultSet to be scrollable and how to move cursor backward.
There are two options when setting ResultSet to be scrollable:
Generally, TYPE_SCROLL_INSENSITIVE is the preferred option. The data contained in the ResultSet object is fixed (a snapshot) when the object is created. Here is a sample program that shows you how to create a scrollable ResultSet and how to move the cursor backward:
/* DerbyScrollableResultSet.java * Copyright (c) HerongYang.com. All Rights Reserved. */ import java.sql.*; public class DerbyScrollableResultSet { public static void main(String [] args) { Connection con = null; try { con = DriverManager.getConnection("jdbc:derby://localhost/TestDB"); // Create a Statement for scrollable ResultSet Statement sta = con.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); // Catch the ResultSet object ResultSet res = sta.executeQuery("SELECT * FROM Profile"); // Check ResultSet's scrollability if (res.getType() == ResultSet.TYPE_FORWARD_ONLY) { System.out.println("ResultSet non-scrollable."); } else { System.out.println("ResultSet scrollable."); } System.out.println("List of Profiles:"); // Move the cursor to the last row res.last(); // Stop the loop when the cursor is positioned before the first row while (!res.isBeforeFirst()) { String firstName = res.getString("FirstName"); String lastName = res.getString("LastName"); System.out.println(" "+firstName+" "+lastName); // Move the cursor backward one row res.previous(); } // Close ResultSet and Statement res.close(); sta.close(); con.close(); } catch (Exception e) { System.err.println("Exception: "+e.getMessage()); } } }
The output matches my expectation: profiles are listed backward.
ResultSet scrollable. List of Profiles: Keith Harris 1ea2 480c7 17e1 99a5d 8c4 68909 11bd 99552 10cc ab361 8ef 466ca 256d aa3f5 Janet Gates
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
ResultSet Cursor and Scrollability
ResultSet Cursor Initial Position: Before First Row
Retrieving Column Values with getXXX() Methods
ResultSet Default Type: Forward-only
►Scrollable ResultSet and Moving Cursor Backward
ResultSet Objects with Update Capability
insertRow() - Inserting New Rows through ResultSet Objects
updateXXX() - Updating Column Values for Row Update or Insert
deleteRow() - Deleting Rows through ResultSet Objects
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 Express Edition
Microsoft JDBC Driver for SQL Server
Microsoft JDBC Driver - Query Statements and Result Sets
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