canonical data model vs enterprise data model

1. Overview In the use of DLP as a light source for surface exposure 3D Printing system, we often encounter the projector or light machine projection of light, deformation, fuzzy situation. These situations can lead to the following problems: Print model surface has a pixel texture, not enough smooth model local exposure distribution uneven, thick and thin, in the printing of very fine parts especially whe

attributes are required Required .Code first ensures that the validation rules that you specify on the model class are executed before the application modifies the database. For example, the following code throws an exception when the method is called, SaveChanges because several required Movie property values are missing, and the price is 0 (this is outside the valid range).Moviedbcontext db = new Moviedbcontext (); Movie movie = new Movie (), movie

Tags: Click exactly text yourself Pat HTTP article file for BSPReproduced in: http://blog.csdn.net/zhoukun1008/article/details/50528145 Now more and more like MVC, not only because Itoo used him, but because it contains a lot of knowledge points let us go to learn, our Itoo on the server with EF and WCF, and for MVC, he can also work with EF to operate the database, You can also display data to users like WebForm. Below I summarize the use of Dbfirst

Label:Original address Pick up an articleModel tree structure of parent Reference Model tree structureThis data model describes a tree structure that stores references to parent nodes in child nodes.ModeThe parent reference mode stores each tree node in the document, and in addition to the tree node, the document stores the ID of the parent node. Consider the hie

Note: The article is translated from http://wgld.org/, the original author Sambonja 広 (doxas), the article assumes that I have additional instructions, I will add [Lufy:]. Other than that. My own WEBGL research is not deep enough, some professional words. Suppose the translation is wrong. You are welcome to correct me. the meaning of the vertex attributeIn the last article, we introduced the generation of shaders, the compilation, the generation of program objects, and the connection of shaders.

The following small series for you to share a MVC5 based on the model layer development data annotations, with a very good reference value, I hope to be helpful to everyone. Let's take a look at it with a little knitting. In the development of the model layer in ASP. MVC5, the data annotations used have three function

database is installed locally. (Click). If you select the drop-down menu, you will regret it (very difficult) -- "select or enter the database name" Here select the database for which the model is to be generated -- click test connection to see if the connection is successful -- click OKStep 5: As shown in, the model folder has generated the model corresponding

= Backbone.Router.extend ({Routes: {' Help ': ' Help ',//#help"Search/:query": "Search",//#search/kiwis"Search/:query/p:page": "Search"//#search/KIWIS/P7},Help:function () {Alert (1);},Search:function (query, page) {Alert (2);}});var w = new Workspace;Backbone.history.start ();Six. Methods for view-bound events$ (function () {var V = Backbone.View.extend ({El: $ (' body '),Events: {' Click Input ': ' AAA ',' MouseOver li ': ' BBB '},Aaa:function () {alert (123);},Bbb:function () {alert (456);}}

The relational model was introduced into the database field by E.f.codd in 1970. After this, the database experts also defined the basic concept of relational database, introduced the theory of normalization, put forward the data manipulation language such as relational algebra and relational calculus, and laid a solid foundation for the development of database. Because the relational database is based on t

Tags: mongodbMongoDB Data Model and Index learning Summary 1. MongoDB Data Model: MongoDB Data storage structure:MongoDB uses Bson (binary JSON, binary encoded) data format to store and exchange

The first time you get the data from the model is empty, and then the second time you get the data, what's the reason? Reply content: The first time you get the data from the model is empty, and then the second time you get the dat