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In the previous article, I introduced the logic of relationship mapping in Entity Framework Core. The foreign key mapping of EF left in the previous article is not mentioned, that is, the relationship of one-to-one, one to many, many to one, many to many, etc. This article will give you a detailed analysis of how to set up these mappings. 1. Re ...

If you have used JQuery's extension function, you must know something about it. However, the deep copy of extend is not perfect. Here is an example to analyze with the JQuery source code: When using extension, if the first parameter passes in true, it means a "deep copy" is required.But this is an incomplete deep copy, as shown in ...

Project realization: restore Baidu search function; Project principle: use json callback page to transfer parameters; What is jsonp? It uses the src address of the < script > tag to make the target page call back to the local page and bring in parameters, which also solves the cross domain problem; The code is as follows: html (not provid ...

From: https://www.cnblogs.com/du-hong/p/11764517.html brief introduction After the last cosmetic and plastic surgery, some customers asked if they could upgrade the package of that ordinary member and make it more beautiful. So this time let's see where we can make it a little more beautiful. The previous article modified some basic ReportN ...

The charge system in the computer room is half developed. From blind helplessness at the beginning to being able to proceed slowly now, it is a small progress. The basic data setting window in the computer room charging system is a very important window in the whole software. When I open the database software, I see that there are many pieces o ...

Popular understanding of spring source code (5) -- parsing and registering bean definitions Last section talked about how to get document. After converting the document to document, the next extraction and registration bean is our play. protected int doLoadBeanDefinitions(InputSource inputSource, Resource resource) throws Bea ...

OpenZeppelin provides three access control modes for smart contracts: the Ownable contract, the Roles library, and the 3.0 new AccelessControl contract.In this tutorial, we will learn about the differences among the three access control modes and how to use them to enhance the security of Solidity contracts in your own ETAI smart contracts. Le ...

Github address of spring boot Chinese annotation project: https://github.com/yuanmabiji/spring-boot-2.1.0.RELEASE Continued Spring boot event monitoring mechanism source code analysis (I) spring boot source code (IX) Learn from the past Let's review the content of the previous article briefly. In the previous article, we analyzed the principle ...

Preface I've always wanted to write this article, but I've been reviewing it for the sake of exams. I've delayed writing until now. I wrote a small project with node's express framework, which has the function of uploading pictures. Here's how to realize it (I use ejs) thinking First of all, when the user clicks upload avatar to upd ...

In the process of data report and background management system development, we often encounter the operation of summing and filtering the data we get. In fact, it is not difficult to realize them, but if multiple pages need to do these operations, it is troublesome to write a little bit more. When some code repetitio ...