road mapping

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The full name of the ORM is the object Relational Mapping, which is a relational mapping of objects. The essence of it is to represent the business data in the relational data (library) in the form of objects, and to organize these objects by object-oriented (object-oriented) way, and realize the process of the system business logic. The most important concept in the ORM process is

An ORM, the full name (objectrelational Mapping), is the object-relational mapping. The idea of ORM is to map the data of tables in a relational database into objects as objects, so that developers can translate the operations of the database into operations on those objects. Hibernate is the realization of this idea, to facilitate the development of people with object-oriented thinking to achieve the opera

modification of the reference and collection properties in the category and product classes is used for the lazy load function of the entity Framework Code first. Without virtual decoration, lazy loading will not be enabled when an instance of the category class queries the containing product instance. Of course, the entity Framework Code first delay loading is not necessary, so the virtual modifier can also be added.After defining the above two classes, no more

;, [key name of the target type]This approach requires that the key column names in the product table are the same as the primary key column names in the category table, so there is a requirement to have the attribute defined in the product class as the primary key in the category class. If the primary key attribute in the category class is CategoryID, you need to define a CategoryID attribute in the product class as well.File Category.cs:View CodeFile Product.cs:View CodeDescription: A virtual

Object-Relational mapping (Object/relation Mapping, or ORM), which arises from the development of object-oriented software development methods, is a technique to solve the phenomenon of non-matching between object-oriented and relational database. Essentially, it's converting data from one form to another. Hibernate, as the representative of an ORM framework, is implemented by the basic

Solidity Tutorial Series 6th-solidity structure and mapping.For a complete list of articles in the solidity series, see Category-solidity.Write in frontSolidity is the Ethereum Smart Contract programming language, you should know about Ethereum and smart contracts before reading this article.If you don't understand, it's recommended that you look at Ethereum first.Part of this article series is a reference to the solidity official document (currently the latest version: 0.4.20) for translation,

The mapping mechanism of Java and the application of XML in Strutszhjong 1. Description of the problem In the Java development of Web applications, we have to frequently use access to the database, but in the development may encounter many problems, such as user input string is not legitimate, insert data format is not, network connectivity interruption, such as a series of problems, Java provides the mechanism of exception handling, This greatly sim

Inspiration and ideas come quickly, creative to the difficult to organize more difficult, so a reliable way of thinking mapping tool for designers, or very important ~ Today this article recommended 15 brain mapping tools, there is always a suitable for you ~ Brain maps, also called mind maps, are often used to comb ideas, set tasks, and manage projects around a key word or idea. The brain map maps the pat

things that people often use to translate, which brings great convenience to development. 4.ES English website Document Learning route If you need to use ES in a short period of time, you can start quickly with the following route and learn something advanced. The following learning route is to have many years of development experience colleagues to me planning, I hope to be useful to you. The ES version used by my company is 2.3 and encapsulates its own framework. Therefore, when you view the

; Enqueue SoftReference, and did not enter the queue; WeakReference, will enter the queue, the timing of the queue and finalize the order of execution is not fixed; Phantomreference, also not into the queue; But the API documentation says that Some time after the garbage collector determines that the reachability of the referent have changed to the value correspond ing to the type of the reference, it'll add the reference to the associated queue. But from

AutoMapper is a class library that is used to resolve mapping transformations between objects. For us developers, it's a waste of life to write code between objects, andautomapper can help us save a lot of time.A. What problems did the AutoMapper solve?ask AutoMapper to solve the problem? Is it not an object mapping transformation problem? Of course, but we can ask a little deeper, why is there a lot of obj

,Joincolumns, Joincolumn, InversejoincolumnXml:Bidirectional:Note: Set @manytomany (mappedby= "") on a one-way basis on the other side of the collectionXML: Also set E. Component mapping: A bean that is part of a table, not as an entity, such as a student ID as part of a student entity;Component references in entities add @embeddedUsing Note: (1) bidirectional correlation Mappedby attribute must be set, XML with Indicates that the relationship is domi

In Apache 5.0 and 5.5, I need to modify the Servlet name and class name in the web. xml file for each program. These are not seen in Apache Tomcat 4.0. Why? Jeff Hanson replied: According to Tomcat 5.0 release instructions: "Let web applications ask CGI and SSI, which is used when a Security Manager program (for example, a malicious Web application can use them to bypass security management programs for Access Control) creates security issues. In Tomcat 5.0, they are all set as not permitted, be

Recently in taking over the work of Elasticsearch, which added new fields to the existing mapping, the first to find information on the Internet, found that the information on the Internet is about updating the existing field types in mapping, so write an article about the existing mapping to add new The field of the article, only for Elasticsearch novice learnin

This article summarizes the many-to-many mappings in the MyBatis, as can be seen from the 8th section of the article, the user table and the product represents a many-to-many relationship, both of them are through the order item and order details of the two tables linked together, then this section is mainly to summarize the user table and the product table of the many-to-manyStart by writing SQL on the previous section,SELECTorders.*,User.' username ',User.' Sex ',User.' Address ', OrderDetail.