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- package com.h2.examples;
- import java.sql.Connection;
- import java.sql.DriverManager;
- import java.sql.PreparedStatement;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.sql.Statement;
- // H2 In-Memory Database Example shows about storing the database contents into memory.
- public class H2MemoryDatabaseExample {
- private static final String DB_DRIVER = "org.h2.Driver";
- private static final String DB_CONNECTION = "jdbc:h2:mem:test;DB_CLOSE_DELAY=-1";
- private static final String DB_USER = "";
- private static final String DB_PASSWORD = "";
- public static void main(String[] args) throws Exception {
- try {
- insertWithStatement();
- insertWithPreparedStatement();
- } catch (SQLException e) {
- e.printStackTrace();
- }
- }
- private static void insertWithPreparedStatement() throws SQLException {
- Connection connection = getDBConnection();
- PreparedStatement createPreparedStatement = null;
- PreparedStatement insertPreparedStatement = null;
- PreparedStatement selectPreparedStatement = null;
- String CreateQuery = "CREATE TABLE PERSON(id int primary key, name varchar(255))";
- String InsertQuery = "INSERT INTO PERSON" + "(id, name) values" + "(?,?)";
- String SelectQuery = "select * from PERSON";
- try {
- connection.setAutoCommit(false);
- createPreparedStatement = connection.prepareStatement(CreateQuery);
- createPreparedStatement.executeUpdate();
- createPreparedStatement.close();
- insertPreparedStatement = connection.prepareStatement(InsertQuery);
- insertPreparedStatement.setInt(1, 1);
- insertPreparedStatement.setString(2, "Jose");
- insertPreparedStatement.executeUpdate();
- insertPreparedStatement.close();
- selectPreparedStatement = connection.prepareStatement(SelectQuery);
- ResultSet rs = selectPreparedStatement.executeQuery();
- System.out.println("H2 In-Memory Database inserted through PreparedStatement");
- while (rs.next()) {
- System.out.println("Id " + rs.getInt("id") + " Name " + rs.getString("name"));
- }
- selectPreparedStatement.close();
- connection.commit();
- } catch (SQLException e) {
- System.out.println("Exception Message " + e.getLocalizedMessage());
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- connection.close();
- }
- }
- private static void insertWithStatement() throws SQLException {
- Connection connection = getDBConnection();
- Statement stmt = null;
- try {
- connection.setAutoCommit(false);
- stmt = connection.createStatement();
- stmt.execute("CREATE TABLE PERSON(id int primary key, name varchar(255))");
- stmt.execute("INSERT INTO PERSON(id, name) VALUES(1, 'Anju')");
- stmt.execute("INSERT INTO PERSON(id, name) VALUES(2, 'Sonia')");
- stmt.execute("INSERT INTO PERSON(id, name) VALUES(3, 'Asha')");
- ResultSet rs = stmt.executeQuery("select * from PERSON");
- System.out.println("H2 In-Memory Database inserted through Statement");
- while (rs.next()) {
- System.out.println("Id " + rs.getInt("id") + " Name " + rs.getString("name"));
- }
- stmt.execute("DROP TABLE PERSON");
- stmt.close();
- connection.commit();
- } catch (SQLException e) {
- System.out.println("Exception Message " + e.getLocalizedMessage());
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- connection.close();
- }
- }
- private static Connection getDBConnection() {
- Connection dbConnection = null;
- try {
- Class.forName(DB_DRIVER);
- } catch (ClassNotFoundException e) {
- System.out.println(e.getMessage());
- }
- try {
- dbConnection = DriverManager.getConnection(DB_CONNECTION, DB_USER, DB_PASSWORD);
- return dbConnection;
- } catch (SQLException e) {
- System.out.println(e.getMessage());
- }
- return dbConnection;
- }
- }
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