JDBC Tutorials - Herong's Tutorial Examples - v3.12, by Dr. Herong Yang
ResultSet Objects with Update Capability
This section describes how to create ResultSet objects with update capability.
ResultSet objects can also be created with update capability so that they can be used to perform the same functionalities as the "UPDATE", "INSERT" and "DELETE" SQL statements. To create a ResultSet object with update capability, you must follow several guidelines:
Of course, the Derby JDBC driver does support updatability. So I wrote the following sample program to update one row of the Profile table:
Here is a sample program that updated one row in the Profile table through a ResultSet object:
/* DerbyUpdateResultSet.java * Copyright (c) HerongYang.com. All Rights Reserved. */ import java.sql.*; public class DerbyUpdateResultSet { 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_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE); // Catch the ResultSet object ResultSet res = sta.executeQuery( "SELECT * FROM Profile WHERE ID = 9"); // Check ResultSet's updatability if (res.getConcurrency() == ResultSet.CONCUR_READ_ONLY) { System.out.println("ResultSet non-updatable."); } else { System.out.println("ResultSet updatable."); } // Move the cursor to the first row res.next(); // Get the current first name and last name String firstName = res.getString("FirstName"); String lastName = res.getString("LastName"); System.out.println("Current name: "+firstName+" "+lastName); // Set the new first name and last name res.updateString("FirstName", "Johnny"); res.updateString("LastName", "Caprio"); res.updateRow(); // Can not get the updated first name and last name back // firstName = res.getString("FirstName"); // lastName = res.getString("LastName"); // System.out.println("Updated name: "+firstName+" "+lastName); System.out.println("Updated name: Johnny Caprio"); // Close ResultSet and Statement res.close(); sta.close(); con.close(); } catch (Exception e) { System.err.println("Exception: "+e.getMessage()); e.printStackTrace(); } } }
Here is the output:
ResultSet updatable. Current name: 11bd 99552 Updated name: Johnny Caprio
Notice that I commented out 3 lines of code, because getXXX() methods give me exceptions when called after the updateRow() method. This is not mentioned in the JDBC API document.
Exception: Invalid operation at current cursor position.
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