JDBC Tutorials - Herong's Tutorial Examples - Version 3.03, by Dr. Herong Yang
"ALTER TABLE" Statements
This section describes how to alter a table by adding a new column.
When you are adding new features to an existing database application, very often you need to add new columns to some existing tables. This can be done by using the "ALTER TABLE" statement. Here is a sample Java program that adds a new column called "Discount" to the table "Price":
/* AlterTable.java - Copyright (c) 2015, HerongYang.com, All Rights Reserved. */ import java.sql.*; public class AlterTable { public static void main(String [] args) { Connection con = null; try { con = DriverManager.getConnection( "jdbc:sqlserver://localhost\\SQLEXPRESS;" + "user=sa;password=HerongY@ng;" + "database=AdventureWorks2014"); // Adding a new column to an existing table Statement sta = con.createStatement(); int count = sta.executeUpdate( "ALTER TABLE Herong.Price ADD Discount REAL"); System.out.println("A new column added."); sta.close(); DatabaseMetaData meta = con.getMetaData(); ResultSet res = meta.getColumns(null, null, "Price", null); System.out.println("List of columns: "); while (res.next()) { System.out.println( " "+res.getString("TABLE_SCHEM") + ", "+res.getString("TABLE_NAME") + ", "+res.getString("COLUMN_NAME") + ", "+res.getString("TYPE_NAME") + ", "+res.getInt("COLUMN_SIZE") + ", "+res.getInt("NULLABLE")); } res.close(); con.close(); } catch (Exception e) { e.printStackTrace(); } } }
When you run this program, you should get this output:
C:\herong>\Progra~1\java\jdk1.8.0_45\bin\java -cp .;\local\lib\sqljdbc41.jar AlterTable A new column added. List of columns: Herong, Price, ProductID, int, 10, 1 Herong, Price, Price, real, 24, 1 Herong, Price, Currency, char, 3, 1 Herong, Price, Discount, real, 24, 1
Last update: 2015.
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 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
Executing "Update" Statements - executeUpdate()
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