entity framework query tutorial

Let's start with Orm, many years ago, because. NET's open source component is not as well developed as it is now, let alone an open source ORM framework, for project needs, and when OOP arose (not always, in a project full of SQL statements), began to write the ORM framework. To develop an ORM framework, first understand the ORM concept.ORM Object Relational mapp

In the previous article, we discussed the basic data binding knowledge of the DataGrid. In today's tutorial, I will show you how to use the ADO. NET Entity Framework to perform basic interactions with databases. Overview To make things easier, I will first explain how to retrieve data from the database and return it to the DataGrid. This example shows the fol

after execution. Summary The above are all the steps for creating a database using model first of Entity Framework. Compared with previous versions, it has made great improvements. Now you only need to design an object model. Vs will automatically generate statements for creating data tables, indexes, and table relationships. This is the first article in this series. Later articles will introduce you

to support different databases. (Of course, Microsoft still only has built-in SQL Server Provider and other database providers, third-party development is required ). EF and linq. This is. net development ,. net programmers operate data in object mode and query data in programs using SQL-like syntax, which greatly reduces the tedious work of constructing SQL statements and can focus more on writing business logic code. However, in a distributed appli

Some time ago, many articles in the garden introduced the analysis of LINQ to SQL. It can be said that it is a simple implementation of ORM, And it is Microsoft's problem of unbalanced impedance between data and objects. C #3.0 introduces some new features, such as extension method, Lambda expression, and anonymous type. In fact, these new features are used to serve LINQ. By writing a large number of SQL query statements, values, and assignments in th

The Entity framework maps the entities and relationships defined in the conceptual model to the data source, using the Entity Framework to materialize the data returned by the data source as objects, to track changes made by objects, to handle concurrent processing, to propagate object changes to the data source, and s

ADO. NET Entity Framework, that is, the next generation of ADO. net. It is a more powerful ORM than LINQ to SQL. Developers only need to focus on the development of object models in the domain, rather than how they interact with relational databases. The previous article briefly introduced how to use the ADO. Net object framework in the project. From now on, it o

ADO. NET Entity Framework is the official ORM solution of Microsoft. Therefore, we can't help but remember the famous ORM solution in. NET Program Design-nhib.pdf from the open source. With the impressive appearance of VS2010, how will the new ADO. NET Entity Framework be presented to everyone? What problems does

codefirst (3) programming Entity Framework dbcontext (4) programming Entity Framework 2nd Edition 2. provide another URL: Http://msdn.microsoft.com/en-us/data/ef.aspx 3. In addition, I have created an EF QQ group. If you are interested, add the group number 276721846. V. Article navigation Detailed descript

Entity Framework 6 Recipes Chinese translation series (19), entityframework For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.3-16 bitwise operations in Filtering Problem 　　You want to use bitwise operations in the filter conditions of the