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 using users making changes to field values on the UI. An UPDATE statements 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 some columns for specific rows:
/* UpdateRows.java * Copyright (c) HerongYang.com. All Rights Reserved. */ import java.sql.*; public class UpdateRows { public static void main(String [] args) { Connection con = null; try { con = DriverManager.getConnection( "jdbc:sqlserver://localhost\\SQLEXPRESS;" + "user=herong;password=T0pSecret;" + "database=AdventureWorks2019"); Statement sta = con.createStatement(); // updating multiple rows int count = sta.executeUpdate( "UPDATE Herong.Customer SET ModifiedDate = '2015-04-01'" + " WHERE CustomerID > 6"); System.out.println("Number of rows updated: "+count); // getting the data back ResultSet res = sta.executeQuery( "SELECT * FROM Herong.Customer"); System.out.println("List of Customers: "); while (res.next()) { System.out.println( " "+res.getInt("CustomerID") + ", "+res.getString("FirstName") + ", "+res.getString("LastName") + ", "+res.getDate("ModifiedDate")); } res.close(); sta.close(); con.close(); } catch (Exception e) { e.printStackTrace(); } } }
The output confirms that 5 rows were updated with a new date in the LastAccessDate column:
herong> java -cp .;mssql-jdbc-9.4.1.jre16.jar UpdateRows Number of rows updated: 5 List of Customers: 1, Ken, Sánchez, 2009-01-07 2, Terri, Duffy, 2008-01-24 3, Roberto, Tamburello, 2007-11-04 4, Rob, Walters, 2007-11-28 5, Gail, Erickson, 2007-12-30 6, Jossef, Goldberg, 2013-12-16 7, Dylan, Miller, 2015-04-01 8, Diane, Margheim, 2015-04-01 9, Gigi, Matthew, 2015-04-01 10, Michael, Raheem, 2015-04-01 11, Herong, Yang, 2015-04-01
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 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
"INSERT INTO" Statements with INDENTITY Columns
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