Java H2 Create Table Example

JDBC Examples

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• JDBC Create a Table Example
• JDBC Insert Multiple Rows Example
• JDBC Update Query Example
• JDBC Select Query Example
• JDBC Delete Query Example
• JDBC Transaction Management Example
• JDBC Connection to Oracle Database Example
• JDBC Connection to PostgreSQL Example
• JDBC Connection to H2 Database Example
• Java JDBC Connection to HSQLDB Database
• Java PostgreSQL Example
• Java H2 Create Table Example
• Java H2 Insert Record Example
• Java H2 Embedded Database Example

In this post, we will learn how to create a table in the H2 Database using Java programming language.

H2 Database Setup and Configuration

1. Download H2 database dependency or jar file from official website http://www.h2database.com/html/download.html or from https://mvnrepository.com/artifact/com.h2database/h2/1.4.199.
2. Add H2 Jar file to your project classpath.
3. By default the Java application to connect to an H2 in-memory store with the username sa and an empty password.

 private static String jdbcURL = "jdbc:h2:~/test";
 private static String jdbcUsername = "sa";
 private static String jdbcPassword = "";

JDBC Util Class

Let's first create an H2JDBCUtils.java file with all JDBC common methods like:

package net.javaguides.jdbc.h2.crud;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class H2JDBCUtils {

    private static String jdbcURL = "jdbc:h2:~/test";
    private static String jdbcUsername = "sa";
    private static String jdbcPassword = "";

    public static Connection getConnection() {
        Connection connection = null;
        try {
            connection = DriverManager.getConnection(jdbcURL, jdbcUsername, jdbcPassword);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return connection;
    }

    public static void printSQLException(SQLException ex) {
        for (Throwable e: ex) {
            if (e instanceof SQLException) {
                e.printStackTrace(System.err);
                System.err.println("SQLState: " + ((SQLException) e).getSQLState());
                System.err.println("Error Code: " + ((SQLException) e).getErrorCode());
                System.err.println("Message: " + e.getMessage());
                Throwable t = ex.getCause();
                while (t != null) {
                    System.out.println("Cause: " + t);
                    t = t.getCause();
                }
            }
        }
    }
}

This class we will use in the next Java programs.

Create a Table with the H2 Database

This Java program creates a users table into the H2 database.

package net.javaguides.jdbc.h2.crud;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * Create Statement JDBC Example
 * @author Ramesh Fadatare
 *
 */
public class H2CreateExample {

    private static final String createTableSQL = "create table users (\r\n" + "  id  int(3) primary key,\r\n" +
        "  name varchar(20),\r\n" + "  email varchar(20),\r\n" + "  country varchar(20),\r\n" +
        "  password varchar(20)\r\n" + "  );";

    public static void main(String[] argv) throws SQLException {
        H2CreateExample createTableExample = new H2CreateExample();
        createTableExample.createTable();
    }

    public void createTable() throws SQLException {

        System.out.println(createTableSQL);
        // Step 1: Establishing a Connection
        try (Connection connection = H2JDBCUtils.getConnection();
            // Step 2:Create a statement using connection object
            Statement statement = connection.createStatement();) {

            // Step 3: Execute the query or update query
            statement.execute(createTableSQL);

        } catch (SQLException e) {
            // print SQL exception information
            H2JDBCUtils.printSQLException(e);
        }
    }
}

Output:

create table users (
  id  int(3) primary key,
  name varchar(20),
  email varchar(20),
  country varchar(20),
  password varchar(20)
  );