Creating MySQL database programatically in Java

There are times that you might need to create database or tables right after you run your program instead of manually creating it. In this example I will show you how you can do this using JDBC and MySQL database. The first thing we need to do as usual when creating a JDBC program is to define a JDBC URL. One thing that you’ll notice here is that we don’t define the database name in the URL. So the URL will be like jdbc:mysql://localhost.

After defining the URL we need to create a connection to the database. We issued the DriverManager.getConnection() method and pass the URL, username and password as the arguments. The next step is to create a PreparedStatement. When we call the preparedStatement() method we pass an SQL command to create the database, which is CREATE DATABASE IF NOT EXISTS DEMODB. This will create the database when there is database with DEMODB exists in the database. Finally call the PreparedStatement‘s execute() method.

Now you can try for your self, start typing the following code snippet in your text editor or IDE and execute it to create the database.

package org.kodejava.example.sql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

public class CreateMySQLDatabaseExample {
    public static void main(String[] args) {
        // Defines the JDBC URL. As you can see, we are not specifying
        // the database name in the URL.
        String url = "jdbc:mysql://localhost";

        // Defines username and password to connect to database server.
        String username = "root";
        String password = "root";

        // SQL command to create a database in MySQL.

        try (Connection conn = DriverManager.getConnection(url, username, password);
             PreparedStatement stmt = conn.prepareStatement(sql)) {

        } catch (Exception e) {

After you are executing the code snippet above you will find a new database named DEMODB created in your MySQL database server.

How do I read CLOBs data from database?

package org.kodejava.example.sql;

import java.sql.*;

public class ClobReadDemo {
private static String url = "jdbc:oracle:thin:@localhost:1521:xe";
    private static String username = "kodejava";
    private static String password = "welcome";

    public static void main(String[] args) throws Exception {
        Connection conn = null;
        try {
            conn = DriverManager.getConnection(url, username, password);

            String sql = "SELECT name, description, data FROM documents ";
            PreparedStatement stmt = conn.prepareStatement(sql);
            ResultSet resultSet = stmt.executeQuery();
            while ( {
                String name = resultSet.getString(1);
                System.out.println("Name        = " + name);
                String description = resultSet.getString(2);
                System.out.println("Description = " + description);

                File data = new File("C:\\The Appfuse Primer.txt");

                // Get the character stream of our CLOB data
                Reader reader = resultSet.getCharacterStream(3);
                FileWriter writer = new FileWriter(data);
                char[] buffer = new char[1];
                while ( > 0) {
        } catch (SQLException e) {
        } finally {
            if (conn != null && !conn.isClosed()) {