"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) 2015, 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 = '2007-04-01 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, 1988-12-31, 2006-12-31 23:59:59.999
  2, Janet, Gates, 999.99, 1984-10-13, 2006-12-31 23:59:59.999
  3, 144, 14859, 615.1516, 1988-12-31, 2006-12-31 23:59:59.999
  4, 21d6, efd17, 289.4137, 1988-12-31, 2006-12-31 23:59:59.999
  5, 977, 6779f, 766.5425, 1988-12-31, 2006-12-31 23:59:59.999
  6, 1002, e3873, 996.2754, 1988-12-31, 2006-12-31 23:59:59.999
  7, 1b2c, 8f798, 594.6182, 1988-12-31, 2007-04-01 23:59:59.999
  8, 11bd, 58ad0, 741.9156, 1988-12-31, 2007-04-01 23:59:59.999
  9, 1352, 17d9, 274.19855, 1988-12-31, 2007-04-01 23:59:59.999
  10, 13ba, 88356, 115.04227, 1988-12-31, 2007-04-01 23:59:59.999
  11, 1090, 3fb07, 767.21246, 1988-12-31, 2007-04-01 23:59:59.999
  12, 19c2, 8770b, 383.88382, 1988-12-31, 2007-04-01 23:59:59.999
  13, Keith, Harris, 0.0, 1980-02-29, 2007-04-01 23:59:59.999

Last update: 2015.

Table of Contents

 About This Book

 JDBC (Java Database Connectivity) Introduction

 JDK (Java SE) Installation

 Installing and Running Java DB - Derby

 Derby (Java DB) JDBC Driver

 Derby (Java DB) JDBC DataSource Objects

Java DB (Derby) - DML Statements

 Tables with Primary Key Column "GENERATED ... AS IDENTITY"

 "INSERT INTO" Statements

 "INSERT INTO" Statements with INDENTITY Columns

 Handling Date and Timestamp Values

"UPDATE" Statements

 "DELETE FROM" Statements

 Java DB (Derby) - ResultSet Objects of Queries

 Java DB (Derby) - PreparedStatement

 MySQL Installation on Windows

 MySQL JDBC Driver (MySQL Connector/J)

 MySQL - PreparedStatement

 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 JDBC Drivers

 Oracle - Reference Implementation of JdbcRowSet

 Oracle - PreparedStatement

 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

 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

 Additional Tutorial Notes to Be Added

 Outdated Tutorials

 References

 PDF Printing Version