canonical data model vs enterprise data model

channel.After checking the above definition, I thought the channel and the column already had the deeper understanding. Until I met this question, " when to set up the channel, when to set up the column ?" ”The channel corresponds to the data model, and when a new data model is created, a channel is established. such

PDF browse: http://files.cnblogs.com/JimmyZhang/Linq-To-Sql-Part_2-Define-Data-Model-Class.pdf Source:LINQ to SQL (Part.2-defining our model classes)Glossary Data Model: Data ModelDesigner: designerClass Library: Class LibraryCli

Conceptual Data ModelThe conceptual data Model (conceptual data MODEL,CDM): Expresses the overall logical structure of the data, which is independent of any software and data storage st

=-log2 (0.3) = 1.737Ec =-log2 (0.2) = 2.322 The entropy of the entire information, that is, the number of digits required to express the entire string: E = Ea * 5 + Eb * 3 + Ec * 2 = 14.855 bits Recall that if we use the commonly used ASCII code in the computer, we need a full 80 bits for the above string! Now I know why the information can be compressed without losing the original information. To put it simply, a smaller number of digits is used to represent symbols that frequently appear. Thi

Physical Data Model PDMPhysical data MODEL,PDM: After the logical structure of the database has been designed, the physical design needs to be completed, and PDM is designed to achieve this goal.The physical data model is based on

, select Add (add)? New Item. 2. Select the ADO data model under the data template under the Visual C # Entry (ADO). 3. Select generate from database to create a model from an existing one, click Next. 4, you can choose an existing database connection, you can also choose to create a new database connection, if you cho

Introduction If you have a successfulGaeApplication,Inevitably, You need to modify your database architecture..This article uses a small example to introduce two basic steps for modifying the database architecture: Update Data Model class definitions UpdateDatastoreExisting data entity in(This step is not always necessary,The following will). Be

Spring MVC provides several ways to output model data: Modelandview: Processing method when the return value type is Modelandview, the method body can add model data through the object Map and Model: When the processing method returns, when the entry is Org.springframework.u

This article first introduces the basic concepts and data stream models of storm, and then describes the necessity for storm to support data stream subscription between topology in combination with a typical application scenario, finally, we compare the differences between storm and another stream processing system in the data stream

Learning ASP. NET MVC5 Official Tutorials Summary (vi) access to the model's data through the controllerIn this chapter, we will create a new Moviescontroller controller , write the code to get the movie data, and use the view template to present the data in the browser. Before you proceed to the next step, you need to compile the application, otherwise you will

Tags: relational model translation ref type type semi name record maintenance? The DBMS (Database-management system) consists of a database and a program for accessing data, the basic goal of the DBMS is to provide a convenient and efficient way to access data, and for most enterprises, data is very important, so the D

Label:"Connecting the database configuration and model data models layer"convertion.php config.php Make database connection configuration in config.php Making model ModelsA) The model itself is a class fileb) each data table in the database corresponds to a

The conceptual Data Model (conceptual) is also known as the information model. It is the abstraction of objective things and their connections, the modeling of the information world, the first abstraction of the real world to the information world, and a powerful tool for database designers to design the database. The concept

1. Introduction to PDM The Physical Data Model (Physical Data Model) PDM provides the basic elements required for the initial design of the system and the relationship between related elements; the physical design stage of the database must be detailed on the basis of the background design, including the database store

In a recent project, there are 13 methods that require the same treatment: A SQL statement that takes a specified piece of data from the database, assigns each value in the data to a model, and then sends the data in the model out of the way. Each method takes

data? means that the more data you have, the more important it is to protect the data. It means not only to control the data leaving the own network safely and effectively, but also to control the data access inside the network. Depending on the sensitivity of the

Day 2 -- set a data modelSymfony ReviewOn the first day of this long but interesting guide, we learned how to install the symfony framework and set up a new program and development environment, the source code version control is used to store the source code safely. By the way, the program source code generated on the first day can be obtained in the source code repository of askeet:Http://svn.askeet.com/The goal of the next day is to define the final

Recently in the study of the use of hbase, and carefully read an official recommended blog, here on the side of the translation as a summary of the way and everyone together to comb the HBase data model and basic table design ideas. Official recommended Blog Original address: http://0b4af6cdc2f0c5998459-c0245c5c937c5dedcca3f1764ecc9b2f.r43.cf2.rackcdn.com/9353-login1210_ Khurana.pdf Click on the Open link H

ConceptualDataModel: conceptual data model, which is based on the Entity-RelationShip (E-R) theory and is expanded. It starts from the user Conceptual Data Model: Conceptual Data Model, which is based on the Entity-RelationShip (E

Original Address http://blog.itpub.net/23659908/viewspace-1118762/ Thank you. model design of Data Warehouse A. Data Modeling Methodology The design of Data warehouse model follows the design principle of "top-down and gradual refinement".