Java Utililty Methods JDBC MySQL Connection

Class.forName(driverClass);
StringBuilder url = new StringBuilder();
url.append("jdbc:mysql://");
url.append(host);
url.append(":");
url.append(port);
url.append("/");
url.append(database);
...

try {
    conn = DriverManager.getConnection("jdbc:mysql://localhost/sbs_db?" + "user=root&password=");
    preparedStatement = conn.prepareStatement("DELETE FROM sbs_userdata WHERE Id=" + Id);
    preparedStatement.executeUpdate();
} catch (SQLException e) {
    System.err.println("Error occurs while delete entry from database!");
    e.printStackTrace();
} finally {
...

Connection dbConnection = null;
PreparedStatement preparedStatement = null;
String sql = "SELECT itemId as id FROM items WHERE itemName = ?";
try {
    dbConnection = getDBConnection();
    preparedStatement = dbConnection.prepareStatement(sql);
    preparedStatement.setString(1, item);
    logPreparedStatement(preparedStatement);
...

String result = "5";
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
String sql = "select valor from parametros where chave = ?";
try {
    con = getConnection();
    pstmt = con.prepareStatement(sql);
...

boolean tablesOk = false;
try {
    Class.forName("com.mysql.jdbc.Driver");
    Connection cnn = DriverManager.getConnection(url, user, password);
    PreparedStatement statement = cnn.prepareStatement("SELECT * FROM st_company where 1 = 2 ");
    statement.execute();
    cnn.close();
    tablesOk = true;
...