[This spring, the Android Developer Relations team (where I work, too) went on the road round the world with boxes of phones, their laptops bulging with slide-ware. Here...
It is awkward to do 'Graph databases' in SQL to explore the sort of relationships and memberships in social networks because equivalence relations are classes (a set of sets) rather than sets. However one can explore graphs in SQL if the relationship has all three of the mathematical properties needed for an equivalence relationship.
…
Windows 8 : « Un évènement technique grandiose pour les développeurs va marquer les esprits début juin »
Entretien avec Microsoft France
David Catuhe est responsable, au sein de Microsoft France, des relations techniques avec les développeurs. Jovial et décontracté, il s'est entretenu avec nous des nombreuses initiatives que nous réserve Microsoft…
As part of the Developer Relations team at Google, we get the chance to run lots of different types of events. Some of the most rewarding are hackathons...
Public Relations (PR) is a business practice that plays a pivotal role in defining a business' relationship with its employees, customers, and shareholders. Good PR strengthens brands and builds the public's trust in it - the primary reason most businesses have PR professionals to take care of public communications such as conferences, press…
CodePlex Daily Summary for Wednesday, January 12, 2011Popular ReleasesGoogle URL Shortener API for .NET: Google URL Shortener API v1: According follow specification: http://code.google.com/apis/urlshortener/v1/reference.htmljGestures: a jQuery plugin for gesture events: 0.81: added event substitution for IE updated index.htmlStyleCop for…
Introduction It seems that nowadays everyone loves conventions! Not the ones that you go to, but the ones that you use, that is! It just happens that NHibernate also supports conventions, and we’ll see exactly how. Conventions in NHibernate are supported in two ways: Naming of tables and columns when not explicitly indicated in…
Problem:
I have many-to-many association between two entities A and B.
I set A entity as an owner of their relationship(inverse=true is on A's collection in b.hbm.xml).
When i delete an A entity, corresponding records in join table are deleted.
When i delete an B entity, corresponding records in join table are not deleted (integrity…
I have a database with 3 tables. It's a simple n-m relationship. Student, Course and StudentHasCourse to handle n-m relationship. I post the schema.yml for reference, but it would not be really necessary.
Course:
connection: doctrine
tableName: course
columns:
id:
type: integer(4)
fixed: false
unsigned:…
This is a little long but I have provided all the database structures and queries so that you can run it immediately and help me.
Run the following queries:-
CREATE TABLE IF NOT EXISTS `Tutor_Details` (
`id_tutor` int(10) NOT NULL auto_increment,
`firstname` varchar(100) NOT NULL default '',
`surname` varchar(155) NOT NULL default…
In our days data integration often becomes a key aspect of business success. For business analysts it’s very important to get integrated data from various sources, such as relational databases, cloud CRMs, etc. to make correct and successful decisions. There are various data integration solutions on market, and today I will tell…
For as long as brand social has been around, there’s still an amazing disparity from company to company on the role of Community Manager.
At some brands, they are the lead social innovators. At others, the task has been relegated to interns who are at the company temporarily. Some have total autonomy and trust. Others must…
I'm trying to export an Excel database into .txt (Tab Delimited), but some of my cells are quite large. When I export into a txt some of the cells are exported as '#######....' which is surprisingly useless. Has this happened to anyone else? Do you know an easy fix?
Data from one cell of my column:
Accounting, African…
I have a JAXB setup where I use a @XmlJavaTypeAdapter to replace objects of type Person with objects of type PersonRef that only contains the person's UUID. This works perfectly fine. However, the generated XML redeclares the same namespace (xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance") every time it's used. While…
Hi,
I posted a similar problem but it could not be resolved. I create a relational database of users and groups but for some reason I cannot insert test data with fixtures properly. Here is a sample of the schema:
User:
actAs: { Timestampable: ~ }
columns:
name: { type: string(255), notnull: true }
email: {…
I just started using SQLAlchemy and get a DetachedInstanceError and can't find much information on this anywhere. I am using the instance outside a session, so it is natural that SQLAlchemy is unable to load any relations if they are not already loaded, however, the attribute I am accessing is not a relation, in fact…
Hello,
My user model has three relations for the same message model, and is using raw SQL :/ Is there a better more rails way to achieve the same result?
Could the foreign key be changed dynamically? e.g User.messages.sent (foreign key = author_id) and User.messages.received (foreign key = recipient ) I have been…
Following is a dump of the tables and data needed to answer understand the system:-
The system consists of tutors and classes.
The data in the table All_Tag_Relations stores tag relations for each tutor registered and each class created by a tutor. The tag relations are used for searching classes.
CREATE TABLE IF…
I have a classroom application,and a follow relation. Users can follow each other and can create classrooms.When a user creates a classroom, he can invite only the people that are following him.
The Classroom model is a m2m to User table.
i have in models. py:
class Classroom(models.Model):
creator =…
Ruby on Rails has polymorphic relations which are really useful for implementing functionality such as commenting, tagging and rating to name a few. We can have a comment, tag or rating class which has a many to one polymorphic relationship with a commentable, taggable and rateable object. Also, a given…
Our project has ~40 tables with complex relations.A colleague believes in using long join queries which enforces me to learn about tables outside of my module but I think I should not concern about tables not directly related to my module and use data access functions (written by those responsible for…
Our project has ~40 tables with complex relations.A colleague believes in using long join queries which enforces me to learn about tables outside of my module but I think I should not concern about tables not directly related to my module and use data access functions (written by those responsible for…
Hi there,
First of all I'm quite a Java beginner, so I'm not sure if this is even possible! Basically I have a huge (3+million) data source of relational data (i.e. A is friends with B+C+D, B is friends with D+G+Z (but not A - i.e. unmutual) etc.) and I want to find every cycle within this (not…
I have some big problems with symfony and doctrine at the beginning of a new project. I have created database diagram with mysql workbench, inserted the sql into phpmyadmin and then I've tried symfony doctrine:build-schema to generate the YAML schema.
It generates a wrong schema (relations don't…
I have a pretty simple database with 5 tables, PK's and relationships setup, etc. I also have an ASP.net MVC3 project I'm using to create simple web services to feed JSON/XML to a mobile app using post/get. To access my data I'm using an ADO.net entity model class to handle generation of the…