JDBC Tutorials - Herong's Tutorial Examples - v3.12, by Dr. Herong Yang
"UPDATE" Statements
This section describes how to update existing data rows with UPDATE statements.
UPDATE statements are also commonly used by database applications when users making changes to field values on the UI. An UPDATE statement should have a SET clause to provide a list of columns with new values and a WHERE clause to identify the rows to be updated.
UPDATE statements should be executed with the executeUpdate() method. The Java tutorial program below shows you how to update rows.
/* DerbyUpdateRows.java * Copyright (c) HerongYang.com. All Rights Reserved. */ import java.sql.*; public class DerbyUpdateRows { public static void main(String [] args) { Connection con = null; try { con = DriverManager.getConnection("jdbc:derby://localhost/TestDB"); Statement sta = con.createStatement(); // updating multiple rows int count = sta.executeUpdate( "UPDATE Profile SET ModTime = '2017-04-01 23:59:59.999'" + " WHERE ID > 6"); System.out.println("Number of rows updated: "+count); // Checking updated rows ResultSet res = sta.executeQuery( "SELECT * FROM Profile"); System.out.println("List of Profiles: "); while (res.next()) { System.out.println( " "+res.getInt("ID") + ", "+res.getString("FirstName") + ", "+res.getString("LastName") + ", "+res.getFloat("Point") + ", "+res.getDate("BirthDate") + ", "+res.getTimestamp("ModTime")); } res.close(); sta.close(); con.close(); } catch (Exception e) { System.err.println("Exception: "+e.getMessage()); } } }
The output confirms that 7 rows were updated with a new timestamp in the ModTime column:
Number of rows updated: 7 List of Profiles: 1, Herong, null, 0.0, 1999-12-31, 2016-12-31 23:59:59.999 2, Janet, Gates, 999.99, 2004-10-13, 2016-12-31 23:59:59.999 3, 1403, 896f7, 62.594772, 1999-12-31, 2016-12-31 23:59:59.999 4, 256d, aa3f5, 203.51392, 1999-12-31, 2016-12-31 23:59:59.999 5, d7a, 3a06f, 604.9995, 1999-12-31, 2016-12-31 23:59:59.999 6, 8ef, 466ca, 31.71128, 1999-12-31, 2016-12-31 23:59:59.999 7, 1a34, 59e87, 674.8019, 1999-12-31, 2017-04-01 23:59:59.999 8, 10cc, ab361, 325.30505, 1999-12-31, 2017-04-01 23:59:59.999 9, 11bd, 99552, 315.1111, 1999-12-31, 2017-04-01 23:59:59.999 10, 8c4, 68909, 23.095905, 1999-12-31, 2017-04-01 23:59:59.999 11, 17e1, 99a5d, 186.09494, 1999-12-31, 2017-04-01 23:59:59.999 12, 1ea2, 480c7, 131.6408, 1999-12-31, 2017-04-01 23:59:59.999 13, Keith, Harris, 0.0, 2010-03-01, 2017-04-01 23:59:59.999
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
Tables with Primary Key Column "GENERATED ... AS IDENTITY"
"INSERT INTO" Statements with INDENTITY Columns
Handling Date and Timestamp Values
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 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