Building real-time chat app using WebSockets with AWS API Gateway and Lambda

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| By Navneet Kashyap

We can build many real-time applications such as chat applications, multiplayer games, financial trading platforms, and collaboration platforms using WebSockets with AWS API Gateway, Lambda, and dynamoDB. In this blog we will learn how to build real-time applications using WebSockets

Salesforce | How to access php code in salesforce apex class

| By Webner

We can access the php code in salesforce using @future(callout=true/false). The function we make for accessing the php code in apex class is of static type and does not return any value. Syntax: @future(callout=true) public static void function_Name() { //variable

Joomla- Database Error: Unable to connect to the database

| By Webner

While working with Joomla if you get an error – “Database Error: Unable to connect to the database:Could not connect to database”, check following properties in Joomla’s configuration.php file : //given values are sample data only. var $dbtype = ‘mysql’;

Hibernate | javax.persistence.OptimisticLockException: Row was updated or deleted by another transaction

| By Webner

You may face following exception while trying to update data in a database table using hibernate: javax.persistence.OptimisticLockException : Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.abc.pkg.db.entities.customer.CustomerOfferScheduledTask#2504849] The reason is optimistic lock is applied on

Salesforce | How to create Single Dynamic Batch Class to update multiple Sobjects in Salesforce

| By Webner

Suppose you want to update field name ‘Status’ to ‘Active’ in multiple Sobject and there are large number of records for each Sobject. Instead of writing a batch class for each Sobject you can update multiple Sobjects like this. Declare

Mysql | Forgot root password in Mysql

| By Webner

If you forget mysql root password these are few easy steps to regain access: 1. shell> mysqld_safe –skip-grant-tables 2.Open another terminal shell> mysql -u root -p (hit enter and use blank password) 3. mysql>UPDATE mysql.user SET Password=PASSWORD(‘NewPassword’)WHERE User=’root’; 4. mysql>FLUSH

Mobile Apps | Fluctuation in the latitude and longitude values for the current location

| By Webner

In mobile applications development tracking lat/long of the current location is one of the most commonly used features. To achieve such functionality we mainly use three types of providers which are: 1. GPS providers 2. Network Providers 3. Sim Card