using entity framework

[Chapter10]. [Insertauthorbook] @AuthorId =1, @BookId =2exec [Chapter10]. [Insertauthorbook] @AuthorId =2, @BookId =3exec [Chapter10]. [Deleteauthorbook] @AuthorId =1, @BookId =1EXEC sp_executesql N ' delete [Chapter10]. [Book] WHERE ([BookId] = @0) ', N ' @0 int ', @0=1How does it work?To map stored procedures to insert and delete operations in many-to-many relationships, we create stored procedures in the database and then use the stored procedure model. Because the EF Design view does not su

Reported exception: Net.sf.json.JSONException:java.lang.reflect.InvocationTargetExceptionThe source of the problem: the date identified in the database is the java.sql.Date type, in Jsonarray.fromobject () is the conversion date format error, Jsonarray conversion date default is Java.util.Date formWorkaround:listfor (int i=0;iRelist.get (i). Setordertime (New Date (Relist.get (i). Getordertime (). GetTime ()));Relist.get (i). Setbegindate (New Date (Relist.get (i). Getbegindate (). GetTime ()));

An enumeration (enum) is a commonly used type, such as a parameter to represent a state, a type, and so on. But at the moment it will not be officially supported in the Ado.net Entity framework. This article describes the use of enumerations through complex types (Complex Types) in Ado.net Entity Framework 4. This met

. orderdate, O. shippingaddress, O. Customer }; However, it is unnecessary to retrieve all the customer information, because all users only need to view the customer name. The following solution combines the associated objects into a separate object consisting of the required data. VaRResult =FromOInCTX. OrdersSelect New{O. orderid, O. orderdate, O. shippingaddress, O. Customer. name }; In the real world, using anonymous types can be very painfu

mode. The EDM mode in a project is represented by a file with the extension. edmx. This file containing EDM can be designed using the EDM designer in Visual Studio. Because this file is essentially an xml file, you can manually edit this file to define the CSDL, MSL, and SSDL parts. CSDL defines the concept model of EDM or the soul of the entire program. This document defines the concept of a model from the perspective of a program language. That is

mode. The EDM mode in a project is represented by a file with the extension. edmx. This file containing EDM can be designed using the EDM designer in Visual Studio. Because this file is essentially an xml file, you can manually edit this file to define the CSDL, MSL, and SSDL parts. CSDL defines the concept model of EDM or the soul of the entire program. This document defines the concept of a model from the perspective of a program language. That is

. newGuid (). toString (), Account = "test33", Password = "test33"}; UserDetail detail = new UserDetail () {ID = Guid. newGuid (). toString (), Name = "userName33", Sex = 1, Note = "Test content 33", Height = 175}; user. userDetails. add (detail); role. users. add (user); db. roles. add (role); db. saveChanges (); List We found that through the operation of the code above, several tables have written data, and the reference relationships between them are included.2. Extraction of

Entity Framework tutorial -- Entity type in Entity Framework, entityframework Entity types in Entity Framework: In the previous chapter, we

Http://www.cnblogs.com/xlovey/archive/2011/01/03/1924800.htmlADO Entity Framework OverviewADO in the new version features the new Entity Framework. It enables developers to focus on data through the object model, rather than the logical/relational data model. The Entity

ADO Entity Framework OverviewADO in the new version features the new Entity Framework. It enables developers to focus on data through the object model, rather than the logical/relational data model. The Entity Framework helps abst

In the previous article, you have learned how to implement a table inheritance for each hierarchy. In this section, you will learn the advanced features that you can take advantage of when you develop an ASP. NET Web application using entity Framework Code first.In this section you will reuse the pages that you have created before, and then you need to create a n

In the previous article, you have learned how to implement a table inheritance for each hierarchy.In this section, you will learn the advanced features that you can take advantage of when you develop an ASP. NET Web application using entity Framework Code first.In this section you'll reuse the pages you've created before, and then you'll need to create a new page

The formation of Entity Framework object Framework-Summary of several experiences in Entity Framework Development, entityframework Some time ago, I made some research on the Entity Framework