B4J Library [B4X] jRDC2 - B4J implementation of RDC (Remote Database Connector) - Erel    
Jun 22, 2026   
(42 reactions) servers.
jRDC2 is the latest version. All new projects should use this version.
jRDC2 is made... with B4A, B4J and B4i is responsible for sending the requests and handling the responses.
jRDC2 can work... of the server hosting jRDC2. It must end with /rdc.
2. Add DBRequestManager class to your project... jRDC2 to support B4R: https://www.b4x.com/android/forum/threads/rdc-based-on-mqtt.72416/#content...
link: as required by jServer v5.
For new projects it is recommended to switch to jRDC3: https://www.b4x.com/android...
Share My Creation [Project Template] jRDC2 Server - aeric    
Jun 24, 2026   
(5 reactions)
Updates
jRDC3 Server is available
Version: 3.30
Project template based on jRDC2 version 2.23 with sample database.
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GitHub: https://github.com/pyhoon/jrdc2-server-template-b4j
Template:
JRDC Server (3.30).b4xtemplate
Supported databases:
SQLite
MySQL
MS SQL
Firebird
Postgresql
DBF
Depends on:
JavaObject
jRandomAccessFile
jServer
jShell
jSQL
B4X Client app:
jRDC2 Client...-template-jrdc2-server-sqlite-mysql-ms-sql-firebird-postgresql-dbf.147542/...
Spanish [TUTORIAL] Acceder a base de datos con jRDC2 - josejad    
Apr 15, 2025   
(7 reactions).NET, etc...
3.- jRDC2: Es la forma recomendada por Erel para acceder a base de datos y sobre la que nos centraremos en este tutorial.
Las ventajas de jRDC2 son:
Soporta la mayoría de las bases de....
Soporta todo tipo de consultas, incluidas consultas BATCH (por lotes)
Soporta BLOB's
jRDC2... puede usar en B4A, B4i o B4J.
Por tanto, para usar jRDC2, necesitas ejecutar la aplicación servidor (un... de librerías adicionales de B4J
- Descarga el código fuente del servidor B4J del tutorial jRDC2 (o...
Share My Creation jRDC2 server with login session - aeric    
May 20, 2025   
(8 reactions)https://www.b4x.com/android/forum/attachments/jrdc2-server-png.162504/
A jRDC2 server with login session modified from jRDC2 Server.
This project is currently a proof of concept.
It demonstrates a login test using email and password to return a session id.
This session id is required... if you are interested.
GitHub: https://github.com/pyhoon/jrdc2-with-session-b4j
I don't use jRDC2 but if anyone wants to make his jRDC2 more secure, he can check this project to get some ideas...
Spanish [B4XPages] jRDC2 + MySQL CRUD + Login - josejad    
Feb 24, 2022   
(15 reactions) login, etc... pero he visto pocos con jRDC2.
Los datos de la base de datos y la interfaz gráfica son... crear el servidor jRDC2
- B4A 9.9+ que ya soporta B4XPages, aunque lo ideal es siempre actualizar... sql a tu base de datos. Puedes usar phpMyAdmin, HeidiSQL, etc…
- Configurar el servidor jRDC2. Para...-database-connector.61801/
- Abre B4A, y en la clase jRDC2, cambia la constante rdcLink para que apunte al ordenador en el que estás ejecutando el servidor jRDC2 (B4J). (Puedes verlo con ipconfig en windows...
Share My Creation [Project Template] [B4X] jRDC2 Client (B4A, B4i, B4J) - aeric    
Dec 17, 2025   
(6 reactions)Version: 3.00
Description: JRDC Client Template to be used with jRDC2 Server.
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GitHub: https://github.com/pyhoon/jrdc2-client-template-b4x
How to use:
Run jRDC2 Server
Create a new project from B4A, B4i or B4J
Change the rdcLink in Main module to jRDC2 server IP and run
B4A and... using Macro will copy the files from shared folder.
Note: When debugging with B4J client, jRDC2...-template-b4x-jrdc2-client-b4j-b4a-b4i.147543/...
Share My Creation jRDC2 server authentication + console client - aeric    
May 7, 2025   
(7 reactions)
Update
Here is another example using session id
https://www.b4x.com/android/forum/threads/jrdc2-server-with-login-session.166903/
Simple jRDC2 server authentication example with user name and password
This example is based on this solved question for learning purpose.
If user name and... password.
GitHub: https://github.com/pyhoon/jrdc2-server-authentication-b4j
156611... app to connect to the server.
Edit the rdcLink host IP in Main module.
console.jar need to be run...
B4J Library Modded jRDC2 w/SQLite support and more - OliverA    
Jul 28, 2024   
(15 reactions)Attached you'll find a modified version of jRDC2 (source https://www.b4x.com/android/forum... replacement for jRDC2. This is more meant for people starting new with jRDC2. Comments are welcome... procedures add-on is technically unnecessary. Out of the box, jRDC2 can handle simple stored... to test the jRDC2 server against. Finally, you have to have patience with me, I'm slow.
Client... AppNotes)
' Merge changes from @Erel's jRDC2 version 2.23
' Merged MSSQL date issue...
B4J Tutorial jRDC2 client example (using modded jRDC2) - OliverA    
Jul 28, 2024   
(7 reactions)Attached you find an example of accessing a jRDC2 server. This is a conversion of the DBUtils... use the modded jRDC2 server (here: https://www.b4x.com/android/forum/threads/modded-jrdc2-w-sqlite... uncaught exceptions errors that I triggered in the original jRDC2 code (here: https://www.b4x.com... note that I create a "helper" code module jRDC2Utils that encapsulates some of the jRDC2... it shows a small glimpse of jRDC2.
2024/07/27:
Moved notes from Main to here (code module...
B4J Code Snippet [Project Template] jRDC2 Server (SQLite, MySQL, MS SQL, Firebird, Postgresql, DBF) - aeric    
Feb 20, 2025   
(16 reactions)
Updates
jRDC2 Server v2 is available
jRDC2 Server Template
Version: 1.12 (based on jRDC2 version 2.23)
Create a new project and run it!
To be accompanied with jRDC2 Client Template
Introduction:
To be edited
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Version 1.00 : 9KB
Version 1.11 : 127KB
Version 1.12 : 127KB
Version 2.00 (beta) : 127KB
Note: If you think the latest version is big, you can use version 1.00 otherwise you can remove the images inside www/img or use smaller size images....
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