by Manish Bharti | Jun 22, 2014 | Grails, Grails 2.3.0, Hibernate
Hello there, I am again with you to share a solution of a problem that I have faced in a project and I solve that problem using hibernate MEMBER OF operator. Requirement is simple, I have a Post domain which has many users: class Post { String content static hasMany =...
by Neeraj Bhatt | Jun 22, 2014 | Grails, Grails 2.3.0
We usually have to Google to find the error code of the validation error message if you are new Grails developer. This blog gives the simplest way to get error code for validation error message. Suppose we have a Domain class User class User { String username String...
by Tinku Saini | Jun 21, 2014 | Grails, Grails 2.3.0
Hello, friends I am again with you to share solution of a problem in functional testing using geb in grails. I have faced this problem while I am using chrome browser to run test. This shows an exception that you do not have any driver for chrome but I have already...
by Tinku Saini | Jun 19, 2014 | Grails, Grails 2.3.0
Hello, This blog post is for beginner’s who are new to testing. We use Geb(The browser automation tool) with grails to test our application in this blog. First of all what is Geb? Geb is a browser automation tool use web-content and web-browser for automation...
by Prabhat Singh | Jun 17, 2014 | Embedded
Introduction: A voltage Translator is used to change the voltage level of signals and an Isolator is a device which isolates one side from another side up to a voltage level . If you want to develop communication between two devices which works on different voltage...
by Manish Bharti | Jun 15, 2014 | GORM, Grails, Grails 2.3.0
In the blog Prashant Gupta demonstrate how to use embedded property in hibernate. We can do the same thing in grails using embedded property of grails domain class. Syntax: static embedded = [‘address’, ‘payment’] Purpose: Supports embedding...
by Manish Bharti | Jun 8, 2014 | GORM, Grails, Grails 2.3.0
In my previous blog we have seen how to set failOnError and flush globally. In this blog I am providing a use case of failOnError and flush. Lets have a simple domain class class Person { String firstName String lastName String email static constraints = { firstName...
by Prabhat Singh | Jun 4, 2014 | Embedded
Introduction: This blog is written for SPI communication between ADE7753 IC and Nuvoton NUC200VE3AN 32 bit microcontroller. If you want to know more about SPI communication, I would suggest you to read my another blog NUC200VE3AN SPI basic part 1.(link will post very...
by Prabhat Singh | Jun 4, 2014 | Embedded
Introduction: This blog is written for SPI communication between ADE7753 IC and NUC200VE3AN 32 bit microcontroller. If you want to know more about SPI communication, I would suggest you to read my another blog NUC200VE3AN SPI basic part 1.(link will post very soon)...
by Vivek Sadh | May 29, 2014 | Database
Hi Guys, this is my second blog post of this month. The title is “Using SQLFiddle”. In this post I am going to explain about a very useful online tool SQLFiddle which I have been using for a while. As JSFiddle is used to run and test CSS, JQuery etc, using...
by Manish Bharti | May 27, 2014 | GORM, Grails, Grails 2.3.0
save() method of domain class accepts two parameters failOnError and flush (both of these parameters are optional). failOnError when it is set to true then save() method will throw ValidationException when validation fails during save. flush when it is set to true...
by Amit Pandey | May 27, 2014 | Node.js
Here I am going to show you that how we can create a Powerful MVC web-application using Node.js. I am going to use locomotive framework to create the web-application. Before starting I would like to give you brief introduction about the locomotive :...
by Amit Pandey | May 27, 2014 | Node.js
Below are the step to setup the development environment of node.js using Mongodb: Open terminal and add the repo executing follwing command on console sudo add-apt-repository ppa:chris-lea/node.js Execute sudo apt-get update Execute sudo apt-get install nodejs Once...
by Amit Pandey | May 27, 2014 | Node.js
In our previous blog I explained that how to create node.js web application using locomotive framework. Now I am going to explain the directory structure and it’s work. Below is the directory structure of the node.js web application using locomotive. I will...
by Gaurav Chauhan | May 22, 2014 | MongoDB
In simple words “indexes are used to speed up query performance”. Let’s say you have a query which takes around 120ms to execute without indexes i can assure you that with proper indexes you can reduce that time by at least 10 times. Let me show you...
by Gaurav Chauhan | May 22, 2014 | MongoDB
In this blog post i am going to explain how to delete MongoDB document. The are few ways which are illustrated below : If we execute remove on collection without any params then it will delete all records db.users.remove({}) // it will delete all documents along with...
by Gaurav Chauhan | May 22, 2014 | MongoDB
In this blog post we are going to see how to drop a field from a MongoDb document ? For people coming from RDBMS you must be remembering the alter table command for dropping/adding columns in a table. In MongoDB it is possible to do this operation on some of the...
by Gaurav Chauhan | May 22, 2014 | MongoDB
In this blog post we are going to learn the process of updating multiple documents in MongoDB. MongoDB provides us with update() function to achieve the same. Here are few use cases : db.users.find(); { "_id" : ObjectId("537da62d770359c2fb4668e2"),...
by Gaurav Chauhan | May 22, 2014 | MongoDB
MongoDB uses save and insert option for adding new records in the database. Let me explain the difference between two : Insert : insert is used to add a document in a mongodb collection Save : save is used to add as well as update a document in a mongodb collection....
by Vivek Sadh | May 22, 2014 | Database
Hello Guys! This is my first blog post of this month and the topic is “Generate CSV file using MYSQL command” In this post I will discuss about an interesting feature of MYSQL. MySQL provides an easy way for generating csv files by writing the output of a...
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