Read about entity framework 6 0, The latest news, videos, and discussion topics about entity framework 6 0 from alibabacloud.com
tables together to flatten them to provide a clearer perspective. When we query each poet's information through the Vwlibraties entity set, only one loop is needed. The output is slightly different because we repeat the poet's name in each poem. The last note in this example is that we did not insert poests,poems and meters through the view vwlibrary. Because in the vast majority of databases, views are read-only. In the
code is very simple, but it is implemented using two nested loops.The last block of code uses the Vwlibrary entity, which is based on the Vwlibrary view. The Vwlibrary view joins tables together to flatten them to provide a clearer perspective. When we query each poet's information through the Vwlibraties entity set, only one loop is needed. The output is slightly different because we repeat the poet's nam
example, we can use the count () method in the Where clause of a LINQ query to check whether the number of comments is greater than 0. In the entity SQL method, we can use count in the WHERE clause (select value 1 from p.comments ) >0. Both of these methods work fine, but the approach in Listing 3-10 is more concise, and from a performance standpoint, any () and
The original purpose of the translation and why choose the Entity Framework 6 Recipes to learn, please see the beginning of this series2-10 Table per Hierarchy inheritance modelingProblemYou have a database table that has a type or identification column. It can tell what the data in the row represents in your application. You want to model using table per hierarc
Entity Framework 6 Recipes 2nd Edition (9-5) Translation-> delete a disconnected Entity, entityrecipes 9-5. delete a disconnected entity Problem We need to delete the object retrieved from WCF. Solution Let's assume that we have the payment and Bill model of the
Entity Framework object Framework formation journey -- using Fluent API configuration in Code First mode (6), -- codefluent The previous article Entity Framework formation journey-Code First F
Apworks Framework practice (6): using the Entity Framework-based warehouse infrastructure, apworksentity In the previous chapter, we have designed a simple domain model. Next we hope to realize the persistence and query of the domain model. Apworks provides the warehousing infrastructure for
Entity Framework 6 Recipes Chinese translation series (6), entityframework2-5 Use Code First to model the self-reference relationship Problem A self-referenced table in your database, you want to use Code First to model it into a person containing self-associated entities. Solution Assume that you have a self-reference
Entity Framework 6 Recipes Chinese translation series (6), entityframework2-5 Use Code First to model the self-reference relationship Problem A self-referenced table in your database, you want to use Code First to model it into a person containing self-associated entities. Solution Assume that you have a self-reference
the LINQ query in EF5. you can view the execution result of listing 13-20 to see its improved performance. In addition, as shown in listing 13-20, you can also disable the "automatic compilation" feature. You can use the underlying object objectcontext of the dbcontext object to get a reference to an object, set its enableplancaching attribute to false. To track each compiled query, EF traverses the query expression Tree node, creates a hash table, and uses it as the index of the compiled query
record. It is important to note how these two parameter objects are assigned to an array of type DbParameter. In order to execute the SQL statement, we pass the string containing the SQL statement and the parameter array of type DbParameter to Method Executesqlcommand (), Execuesqlcommand returns the number of rows affected by the SQL statement. In our example, each time we call the Executesqlcommand () method, we insert a row of data. If your SQL statement does not have any arguments, the Exec
Entity Framework 6 Recipes Chinese translation series (14), entityframework For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.3-
Entity Framework 6 Recipes Chinese translation series (45), entityframework For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.8-
between donor and donation is 0 .. 1 *. We want to modify entities. For example, we want to move a donation from one donor to another and get notifications about these changes from the Entity Framework and Object Manager. In addition, we want the Entity Framework to use the
This article makes the problem easy to solve complicated. In most cases, set the use affected rows parameter in the MySQL connection string to true. Author note. When using the MySQL database as the provider of the Entity Framework, you may encounter the following problems: The number of unexpected rows affected by the storage area update, insert, or delete Statement (
:", root.Name); foreach (var sub in context.GetSubCategories(root.CategoryId)) { Console.WriteLine("\t{0}", sub.Name); } } The output of code list 6-16 is as follows: Parent category is Books, subcategories are: Fiction Non-Fiction History Novel Principle The Entit
context = new Recipe12Context())35 {36 Console.WriteLine("Dealers and Their Cars");37 Console.WriteLine("======================");38 foreach (var dealer in context.Dealers)39 {40 Console.WriteLine("\nDealer: {0}", dealer.Name);41 foreach (var car in dealer.Cars)42 {43 string make = string.Empt
Entity Framework 6 Recipes translation series (2), entityframework Visual Studio The tools we use to develop applications on Windows platforms are Visual Studio. this integrated development environment has evolved for many years from a simple C ++ editor and compiler to a multilingual environment that is highly integrated and supports the entire lifecycle of soft
Entity Framework 6 Recipes translation Series 3, entityframeworkChapter 2 basis of Object Data Modeling It is very likely that you start to explore the Entity Framework. You may ask "How do we start ?", If this is the case, this chapter is a good start. If not, you have alre
Entity Framework 6 Recipes Chinese translation series (11), entityframework For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.Chapter 3 Query The previous chapte
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
