Can you guys point in the direction of either a concept on how I would do this or a sample project for Ecllipse / GWT that I can go thru.
Keeping in mind I am new at this too. I can figure most things out with sample code. My Secario: I have installed MySQL Database on my PC Trying to make a GWT application to interact with this Database In the hope to Base this on the same senario but on a web based system. i.e. MySQL on a website and the GWT app interacting with this. Any help would greatly appricated. Thanks for the help thus far. Stephan On Sep 3, 9:44 am, Isaac Truett <[email protected]> wrote: > Hi, > > The problem is that you're trying to mix GWT and java.sql. That's not > going to work. JS in the browser can't connect to your database. > > The cause of your specific error is that Class.forName() is not a part > of the JRE that GWT emulates. > > See also:http://code.google.com/webtoolkit/doc/1.6/RefJreEmulation.html > > - Isaac > > On Wed, Sep 2, 2009 at 7:21 PM, > > > > GumbyGWTBeginner<[email protected]> wrote: > > > Hi Guys, > > > Was wondering if anyone could answer a small question? > > > I have created a class called DBFlow (Code below) which connects to > > a MySQL DB and retrieve the number of rows in a DB. > > > I am new at this could anyone throw some light on the subject. > > > ****************Error Message**************** > > > [ERROR] Line 51: The method forName(String) is undefined for the type > > Class > > > ****************Code to Call Class**************** > > > DBFlow TestTheDB = new DBFlow(); > > TestTheDB.main(); > > > ****************Class Code**************** > > > import java.sql.Connection; > > import java.sql.DriverManager; > > import java.sql.ResultSet; > > import java.sql.SQLException; > > import java.sql.Statement; > > import java.lang.Class; > > import com.google.gwt.user.client.Window; > > > public class DBFlow { > > > public void onModuleLoad() { > > //sdsd > > > } > > > public DBFlow() { > > //sdsd > > > } > > > public void main() { > > Connection conn = null; > > try { > > conn = getConnection(); > > String tableName = "family"; > > Window.alert("tableName=" + tableName); > > Window.alert("conn=" + conn); > > Window.alert("rowCount=" + countRows(conn, > > tableName)); > > } catch (Exception e) { > > Window.alert("No Connect"); > > e.printStackTrace(); > > //System.exit(1); // Edit out as it is an erro > > } finally { > > // release database resources > > try { > > conn.close(); > > } catch (SQLException e) { > > e.printStackTrace(); > > } > > } > > } > > > public Connection getConnection() throws Exception { > > String driver = "com.mysql.jdbc.Driver"; > > String url = "jdbc:mysql://localhost:3306/dogs"; > > String username = "root"; > > String password = "mypass"; > > > Class.forName(driver); // load MySQL driver > > ***************************************Error here apprantly > > Connection conn = DriverManager.getConnection(url, username, > > password); > > return conn; > > } > > > public int countRows(Connection conn, String tableName) throws > > SQLException { > > // select the number of rows in the table > > Statement stmt = null; > > ResultSet rs = null; > > int rowCount = -1; > > try { > > stmt = conn.createStatement(); > > rs = stmt.executeQuery("SELECT COUNT(*) FROM " + > > tableName); > > // get the number of rows from the result set > > rs.next(); > > rowCount = rs.getInt(1); > > } finally { > > rs.close(); > > stmt.close(); > > } > > return rowCount; > > } > > > }- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
