Class.forName("org.hsqldb.jdbcDriver");
Connection con = DriverManager.getConnection(
 "jdbc:hsqldb:/C:/MeusArquivos/projBlueJ/novo.db",
 "sa", "");

Statement stm = con.createStatement();

PreparedStatement pstm = con.prepareStatement(
 "INSERT INTO funcionario " +
 "(matricula, nome) VALUES (?, ?)");


SimpleDateFormat fmt = new SimpleDateFormat("hh:mm:ss:SSSS");

System.out.println(fmt.format(new java.util.Date()));


MySQL

Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection(
  "jdbc:mysql://localhost:3306/banco",
  "username","password");

PostgreSQL

Class.forName("org.postgresql.Driver");
Connection connection = DriverManager.getConnection(
  "jdbc:postgresql://127.0.0.1:5432/testdb",
  "username", "password");

SQL Server

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection conn = DriverManager.getConnection(
  "jdbc:sqlserver://MYPC\\SQLEXPRESS;databaseName=MYDB", 
  "username", "password")

ORACLE

Class.forName("oracle.jdbc.driver.OracleDriver"); 
Connection conn = DriverManager.getConnection(
	"jdbc:oracle:thin:@localhost:1521/banco",
  "username", "password")