Re: Db Connectivity
Hi, Asynchronous calls? What does this mean? I tried using threads. But,it gives the error: ClassName cannot be found in the source package! If you can give some example pages on Asynchronous calls, would be very helpful. Thanks in advance! -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Db Connectivity
http://code.google.com/webtoolkit/doc/latest/DevGuideServerCommunication.html On Wed, Dec 15, 2010 at 6:39 PM, Ashok uashoksun...@gmail.com wrote: Hi, Asynchronous calls? What does this mean? I tried using threads. But,it gives the error: ClassName cannot be found in the source package! If you can give some example pages on Asynchronous calls, would be very helpful. Thanks in advance! -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. -- David Chandler Developer Programs Engineer, Google Web Toolkit http://googlewebtoolkit.blogspot.com/ -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Db Connectivity
Thanks, John LaBanca jlaba...@google.com On Wed, Dec 15, 2010 at 7:35 PM, David Chandler drfibona...@google.comwrote: http://code.google.com/webtoolkit/doc/latest/DevGuideServerCommunication.html On Wed, Dec 15, 2010 at 6:39 PM, Ashok uashoksun...@gmail.com wrote: Hi, Asynchronous calls? What does this mean? I tried using threads. But,it gives the error: ClassName cannot be found in the source package! If you can give some example pages on Asynchronous calls, would be very helpful. Thanks in advance! GWT does not support threads... nor does JavaScript. Asynchronous means that you trigger an event to be completed some time in the future. There are two variations in GWT: asynchronous RPC calls to the server, and timers/scheduled commands. RPC calls send a request to the server, then at some later point, the server responds and triggers a callback. Timers/Scheduled Commands (see Scheduler) specify a method to run after some timeout. However, keep in mind that JavaScript is single threaded. Lets say you schedule a Timer for 1ms, then synchronously perform 100ms worth of code execution. Since JavaScript is single threaded, your Timer will not fire for at least 100ms, even though you scheduled it for 1ms. Its asynchronous because the code in the Timer executes after the current execution block. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-toolkit@googlegroups.com . To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.comgoogle-web-toolkit%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. -- David Chandler Developer Programs Engineer, Google Web Toolkit http://googlewebtoolkit.blogspot.com/ -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.comgoogle-web-toolkit%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. -- You received this message because you are subscribed to the Google Groups Google Web Toolkit group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
Re: Db Connectivity
Vindhya,
Getting back to the root of your original question, you can't connect
directly to a database with GWT because there's no way to connect to a
database directly from JavaScript. Instead, you create a GWT service
and implement it on the server, where you can connect to a database
using JDBC or any Java persistence framework. Here's an article on
using GWT with Hibernate that you will hopefully find helpful:
http://code.google.com/webtoolkit/articles/using_gwt_with_hibernate.html
And this link explains how to communicate with the server using GWT-RPC:
http://code.google.com/webtoolkit/doc/latest/DevGuideServerCommunication.html
/dmc
On Thu, Dec 9, 2010 at 2:51 PM, Vindhya vin...@gmail.com wrote:
Hello Friends,
I am new to GWT and I am developing an application, - a form based
one, to insert/delete/edit tuples in a set of tables.
I am facing problems with the connectivity to the database.
I kept getting an error:
java.sql.Connection can not be found in source packages. Check the
inheritance chain from your module; it may not be inheriting a
required module or a module may not be adding its source path entries
properly.
The code I wrote is as follows:
code
package com.company.rulesengine.client;
import java.sql.*;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextBox;
/**
* Entry point classes define codeonModuleLoad()/code.
*/
public class RulesEngineUI implements EntryPoint {
public Connection conn= null;
RulesEngineUI()
{
//establishing a database connection
try
{
Class.forName(oracle.jdbc.driver.OracleDriver).newInstance();
String url = url;
conn = DriverManager.getConnection(url, SYSTEM, vindhya);
// doTests();
System.out.println(DONE!);
conn.close();
}
catch (Exception ex) {System.err.println(ex.getMessage());}
}
private Button clickMeButton;
public void onModuleLoad()
{
RootPanel rootPanel = RootPanel.get();
clickMeButton = new Button();
rootPanel.add(clickMeButton, 232, 236);
clickMeButton.setText(Insert);
Label lblEmployeeId = new Label(Employee ID);
rootPanel.add(lblEmployeeId, 30, 61);
Label lblName = new Label(Employee Name);
rootPanel.add(lblName, 26, 142);
TextBox textBox = new TextBox();
rootPanel.add(textBox, 233, 59);
TextBox textBox_1 = new TextBox();
rootPanel.add(textBox_1, 232, 142);
clickMeButton.addClickHandler(new ClickHandler(){
public void onClick(ClickEvent event) {
Window.alert(Hello, GWT World!);
}
});
}
}
/code
Any help in this regard will be well appreciated.
Thank you,
Vindhya
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http://googlewebtoolkit.blogspot.com/
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Re: Db Connectivity
Hi, the exact list of classes that you can use is here:
http://code.google.com/webtoolkit/doc/latest/RefJreEmulation.html
Be careful though: some methods are supported and some not, the list
above details it.
regards
didier
On Dec 10, 6:39 am, aditya sanas 007aditya.b...@gmail.com wrote:
Hi,
The code you write in java gets converted into javascript this is what GWT
does so GWT works on client side
so there is some restriction on usage of classes and packages that u refer
in GWT code just like *java.sql. or java.io*
*these packages are not available on client side*
So to use these classes,GWT has provided server side where you can access
these classes so make ur connection on the server side do processing and
send result back to client.
Async calls would be helpful in this case.
--
Aditya
On Fri, Dec 10, 2010 at 1:21 AM, Vindhya vin...@gmail.com wrote:
Hello Friends,
I am new to GWT and I am developing an application, - a form based
one, to insert/delete/edit tuples in a set of tables.
I am facing problems with the connectivity to the database.
I kept getting an error:
java.sql.Connection can not be found in source packages. Check the
inheritance chain from your module; it may not be inheriting a
required module or a module may not be adding its source path entries
properly.
The code I wrote is as follows:
code
package com.company.rulesengine.client;
import java.sql.*;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextBox;
/**
* Entry point classes define codeonModuleLoad()/code.
*/
public class RulesEngineUI implements EntryPoint {
public Connection conn= null;
RulesEngineUI()
{
//establishing a database connection
try
{
Class.forName(oracle.jdbc.driver.OracleDriver).newInstance();
String url = url;
conn = DriverManager.getConnection(url, SYSTEM, vindhya);
// doTests();
System.out.println(DONE!);
conn.close();
}
catch (Exception ex) {System.err.println(ex.getMessage());}
}
private Button clickMeButton;
public void onModuleLoad()
{
RootPanel rootPanel = RootPanel.get();
clickMeButton = new Button();
rootPanel.add(clickMeButton, 232, 236);
clickMeButton.setText(Insert);
Label lblEmployeeId = new Label(Employee ID);
rootPanel.add(lblEmployeeId, 30, 61);
Label lblName = new Label(Employee Name);
rootPanel.add(lblName, 26, 142);
TextBox textBox = new TextBox();
rootPanel.add(textBox, 233, 59);
TextBox textBox_1 = new TextBox();
rootPanel.add(textBox_1, 232, 142);
clickMeButton.addClickHandler(new ClickHandler(){
public void onClick(ClickEvent event) {
Window.alert(Hello, GWT World!);
}
});
}
}
/code
Any help in this regard will be well appreciated.
Thank you,
Vindhya
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Db Connectivity
Hello Friends,
I am new to GWT and I am developing an application, - a form based
one, to insert/delete/edit tuples in a set of tables.
I am facing problems with the connectivity to the database.
I kept getting an error:
java.sql.Connection can not be found in source packages. Check the
inheritance chain from your module; it may not be inheriting a
required module or a module may not be adding its source path entries
properly.
The code I wrote is as follows:
code
package com.company.rulesengine.client;
import java.sql.*;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextBox;
/**
* Entry point classes define codeonModuleLoad()/code.
*/
public class RulesEngineUI implements EntryPoint {
public Connection conn= null;
RulesEngineUI()
{
//establishing a database connection
try
{
Class.forName(oracle.jdbc.driver.OracleDriver).newInstance();
String url = url;
conn = DriverManager.getConnection(url, SYSTEM, vindhya);
// doTests();
System.out.println(DONE!);
conn.close();
}
catch (Exception ex) {System.err.println(ex.getMessage());}
}
private Button clickMeButton;
public void onModuleLoad()
{
RootPanel rootPanel = RootPanel.get();
clickMeButton = new Button();
rootPanel.add(clickMeButton, 232, 236);
clickMeButton.setText(Insert);
Label lblEmployeeId = new Label(Employee ID);
rootPanel.add(lblEmployeeId, 30, 61);
Label lblName = new Label(Employee Name);
rootPanel.add(lblName, 26, 142);
TextBox textBox = new TextBox();
rootPanel.add(textBox, 233, 59);
TextBox textBox_1 = new TextBox();
rootPanel.add(textBox_1, 232, 142);
clickMeButton.addClickHandler(new ClickHandler(){
public void onClick(ClickEvent event) {
Window.alert(Hello, GWT World!);
}
});
}
}
/code
Any help in this regard will be well appreciated.
Thank you,
Vindhya
--
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Re: Db Connectivity
Hi,
The code you write in java gets converted into javascript this is what GWT
does so GWT works on client side
so there is some restriction on usage of classes and packages that u refer
in GWT code just like *java.sql. or java.io*
*these packages are not available on client side*
So to use these classes,GWT has provided server side where you can access
these classes so make ur connection on the server side do processing and
send result back to client.
Async calls would be helpful in this case.
--
Aditya
On Fri, Dec 10, 2010 at 1:21 AM, Vindhya vin...@gmail.com wrote:
Hello Friends,
I am new to GWT and I am developing an application, - a form based
one, to insert/delete/edit tuples in a set of tables.
I am facing problems with the connectivity to the database.
I kept getting an error:
java.sql.Connection can not be found in source packages. Check the
inheritance chain from your module; it may not be inheriting a
required module or a module may not be adding its source path entries
properly.
The code I wrote is as follows:
code
package com.company.rulesengine.client;
import java.sql.*;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.TextBox;
/**
* Entry point classes define codeonModuleLoad()/code.
*/
public class RulesEngineUI implements EntryPoint {
public Connection conn= null;
RulesEngineUI()
{
//establishing a database connection
try
{
Class.forName(oracle.jdbc.driver.OracleDriver).newInstance();
String url = url;
conn = DriverManager.getConnection(url, SYSTEM, vindhya);
// doTests();
System.out.println(DONE!);
conn.close();
}
catch (Exception ex) {System.err.println(ex.getMessage());}
}
private Button clickMeButton;
public void onModuleLoad()
{
RootPanel rootPanel = RootPanel.get();
clickMeButton = new Button();
rootPanel.add(clickMeButton, 232, 236);
clickMeButton.setText(Insert);
Label lblEmployeeId = new Label(Employee ID);
rootPanel.add(lblEmployeeId, 30, 61);
Label lblName = new Label(Employee Name);
rootPanel.add(lblName, 26, 142);
TextBox textBox = new TextBox();
rootPanel.add(textBox, 233, 59);
TextBox textBox_1 = new TextBox();
rootPanel.add(textBox_1, 232, 142);
clickMeButton.addClickHandler(new ClickHandler(){
public void onClick(ClickEvent event) {
Window.alert(Hello, GWT World!);
}
});
}
}
/code
Any help in this regard will be well appreciated.
Thank you,
Vindhya
--
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