JDBC for MySQL - Herong's Tutorial Examples - v3.13, by Herong Yang
Creating Tables with AUTO_INCREMENT Columns
This section describes how to create a table with an AUTO_INCREMENT column.
Different database servers have different ways to support columns with automatically incremented values. MySQL uses the key word AUTO_INCREMENT to specify an auto-incrementing column.
In order to try AUTO_INCREMENT columns and provide a test table for testing DML (Data Manipulation Statements), I wrote the following program to create a table called "Profile" with the primary key column defined as an AUTO_INCREMENT column:
/* MySqlAutoIncrement.java * Copyright (c) HerongYang.com. All Rights Reserved. */ import java.sql.*; import javax.sql.*; public class MySqlAutoIncrement { public static void main(String [] args) { Connection con = null; try { // Setting up the DataSource object - newer version com.mysql.cj.jdbc.MysqlDataSource ds = new com.mysql.cj.jdbc.MysqlDataSource(); // Setting up the DataSource object - older version // com.mysql.jdbc.jdbc2.optional.MysqlDataSource ds // = new com.mysql.jdbc.jdbc2.optional.MysqlDataSource(); ds.setServerName("localhost"); ds.setPortNumber(3306); ds.setDatabaseName("HerongDB"); ds.setUser("Herong"); ds.setPassword("TopSecret"); ds.setServerTimezone(java.util.TimeZone.getDefault().getID()); // Getting a connection object con = ds.getConnection(); // Creating a database table Statement sta = con.createStatement(); int count = sta.executeUpdate( "CREATE TABLE Profile (" + " ID INTEGER PRIMARY KEY AUTO_INCREMENT," + " FirstName VARCHAR(20) NOT NULL," + " LastName VARCHAR(20)," + " Point REAL DEFAULT 0.0," + " BirthDate DATE DEFAULT '2000-12-31'," + " ModTime TIMESTAMP DEFAULT '2026-12-31 23:59:59.999')"); System.out.println("Table created."); sta.close(); con.close(); } catch (Exception e) { System.err.println("Exception: "+e.getMessage()); } } }
When you run this program, table Profile will be created. But you run it again, you will get an exception:
herong> javac -cp .:mysql-connector-java.jar MySqlAutoIncrement.java herong> java -cp .:mysql-connector-java.jar MySqlAutoIncrement Table created. herong> java -cp .:mysql-connector-java.jar MySqlAutoIncrement Exception: Table 'profile' already exists
Table of Contents
JDBC (Java Database Connectivity) Introduction
►MySQL JDBC Driver (MySQL Connector/J)
MySQL Connector/J - Download and Installation
Loading JDBC Driver for MySQL Server
Specifying Timezone During Connection
Creating Connections with DataSource Class
Getting Driver and Server Information
►Creating Tables with AUTO_INCREMENT Columns
MySQL - Reference Implementation of JdbcRowSet
MySQL - JBDC CallableStatement
MySQL CLOB (Character Large Object) - TEXT
MySQL BLOB (Binary Large Object) - BLOB