Creating a Java Database(derby) using DBFactory

Question

Hi
I want to create a Java Database (derby) when running Main. My main program is parsing driver, url, user id and user password to the DBFactory class. I am using netbeans 5.5 with the Sun Java System Application Server and the Java DB server is up and running.
When I run the main program I get no output and no errors. If you will take a look at the main class below and check for novice errors it would much appreciated.
public class Main {
private String driver = "org.apache.derby.jdbc.ClientDriver";
private String url = "jdbc:derby://localhost:1527/";
private String uid = "user";
private String pwd = "user";
private Connection con;
public Main() {
try {
DBFactory db = new DBFactory(driver, url + "JavaDBTest", uid, pwd);
con = db.getConnection();
HashMap metaData = getMetaData();
Iterator meta = metaData.entrySet().iterator();
while (meta.hasNext()) {
Map.Entry entry = (Map.Entry) meta.next();
System.out.println(
(String)entry.getKey() + ": " + (String)entry.getValue());
db.createDB("JavaDBTest");
Statement st = con.createStatement();
ResultSet res = st.executeQuery("show tables");
while (res.next()) {
System.out.println(res.getString(1));
st.executeUpdate("insert into JavaDBTest(name,phone) " +
"values('donald duck', '12345678')");
st.executeUpdate("insert into JavaDBTest(name,phone) " +
"values('mickey mouse', '87654321')");
res = st.executeQuery("select * from JavaDBTest");
while (res.next()) {
System.out.println(
res.getString("name") + " " + res.getString("phone"));
int i = st.executeUpdate("delete from JavaDBTest");
System.out.println("Rows deleted: " + i);
db.dropDB("JavaDBTest");
catch (ClassNotFoundException cnfe) {
System.err.println(cnfe.getMessage());
catch (SQLException sqle) {
System.err.println(sqle.getMessage());
}

Answer 1

add the main entry method to your progam :
public class Main {
private String driver = "org.apache.derby.jdbc.ClientDriver";
private String url = "jdbc:derby://localhost:1527/";
private String uid = "user";
private String pwd = "user";
private Connection con;
public Main() {
try {
DBFactory db = new DBFactory(driver, url + "JavaDBTest", uid, pwd);
con = db.getConnection();
HashMap metaData = getMetaData();
Iterator meta = metaData.entrySet().iterator();
while (meta.hasNext()) {
Map.Entry entry = (Map.Entry) meta.next();
System.out.println(
(String)entry.getKey() + ": " + (String)entry.getValue());
db.createDB("JavaDBTest");
Statement st = con.createStatement();
ResultSet res = st.executeQuery("show tables");
while (res.next()) {
System.out.println(res.getString(1));
st.executeUpdate("insert into JavaDBTest(name,phone) " +
"values('donald duck', '12345678')");
st.executeUpdate("insert into JavaDBTest(name,phone) " +
"values('mickey mouse', '87654321')");
res = st.executeQuery("select * from JavaDBTest");
while (res.next()) {
System.out.println(
res.getString("name") + " " + res.getString("phone"));
int i = st.executeUpdate("delete from JavaDBTest");
System.out.println("Rows deleted: " + i);
db.dropDB("JavaDBTest");
catch (ClassNotFoundException cnfe) {
System.err.println(cnfe.getMessage());
catch (SQLException sqle) {
System.err.println(sqle.getMessage());
public static void main(String[] args) {
   new Main();
}then run your program again and post the errors message.
hth