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, Revenue: $189.98Joan Hills, Total Reservations:2, Revenue: $189.98Using LINQ ...Alex Stevens, Total Reservations:2, Revenue: $189.98Joan Hills, Total Reservations:2, Revenue: $189.98How does it work?In Listing 11-9, in the visitorsummary () function definition, we grouped by the entity's navigation property visitor, we used the ESQL count () function to calculate the number of bookings per visitor, and sum () to total the rent paid by each visitor.In this function, we organize the results into

Entity Framework 6 Recipes 2nd Edition (12-3), entityrecipes 12-3. database connection logs Problem You want to record logs for each connection and disconnection from the database Solution EF exposes a StateChange event for the DbContext connection. We need to handle this event and record logs for each connection and disconnection with the database. Suppose our m

Entity Framework 6 Recipes 2nd Edition (10-10), entityrecipes 10-10. The insert, update, and delete operations inherited by TPH are mapped to the stored procedure. Problem TPH inherits the model and maps its insert, modify, and delete operations to the stored procedure. Solution Assume that the database has a Product table describing different types (see Figure 1

Entity Framework 6 Recipes 2nd Edition (10-5), entityrecipes 10-5. Use custom functions in the storage model Problem You want to use udfs in the model instead of stored procedures. Solution Assume that our database has a member (members) and a messages data table, as shown in Figure 10-4: Figure 10-

();Console.WriteLine ("Number of entities loaded into the context with asnotracking: {0}",Context. Changetracker.entries (). Count ());//output: 0Do not execute queries without the Asnotracking () methodContext. Doctors.include ("Company"). ToList ();Console.WriteLine ("Number of entities loaded into context without asnotracking: {0}",Context. Changetracker.entries (). Count ());//output: 3}The output resu

Entity Framework 6 Recipes 2nd Edition (10-9), entityrecipes 10-9. Use stored procedures for insertion and deletion in many-to-many relationships Problem To use a stored procedure in a load-free multi-to-Multi-Link (the stored procedure only affects the connected tables) Solution Assume that there is a multi-to-many relationship between the Author table (Author)

[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 rel

Entity Framework 6 Recipes 2nd Edition (12-1), entityrecipes The12ChapterCustomizationEF In this section, you can customize entity objects and some features of EF processing. these sections cover a lot of "behind-the-scenes" things, allowing your code to solve things in a more unified manner. For example, you can use a business rule center to perform verification

Entity Framework 6 Recipes 2nd Edition (11-12), entityrecipes 11-12. Define built-in functions Problem You want to define a built-in function used in eSQL and LINQ queries. Solution We want to use the IsNull function in the database, but EF has not released this function for eSQL or LINQ. Suppose we already have a WebProduct entity model, as shown in Figure 11-12

Entity Framework 6 Recipes 2nd Edition (10-8), entityrecipes 10-8. Map insert, modify, and delete operations to stored procedures Problem You want to map the insert, modify, and delete operations to the stored procedure. Solution Suppose there is an athlete entity model, as shown in Figure 10-8. The corresponding database table is shown in Figure 10-9. We want to

A brief introduction to the new features of C #6. net 6 is coming ?, A few weeks ago I read some new features related to C #6 in different places. I decided to collect them all together. If you haven't read them, you can repeat th

this type can be used in subsequent clauses.Using System.console;namespace consoleapplication10{ class program { static void Main (string[] args) { //use writeLine method of Console class //without specifying the class name writeLine ("Hellow World") ; } }}6. Automatic initialization of attributes:The C # 6