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Figure 12-14. The ParkingTicket table with the TicketId, CreateDate, PaidDate, and TimeStamp columns generated by the database Also, let s say you have created a trigger, like the one in Listing 12-11, so that the PaidDate column is populated when the Paid column is set to true. You ve also set the TicketId to be an Identity column and CreateDate to default to the current date. With the trigger in Listing 12-11 and the automatically generated values, only the Amount and Paid columns are required for an insert. Listing 12-11. A trigger that sets the PaidDate column when the Paid bit is set to true create trigger 12.UpdateParkingTicket on 12.ParkingTicket for update as update 12.ParkingTicket set PaidDate = getdate() from 12.ParkingTicket join inserted i on ParkingTicket.TicketId = i.TicketId where i.Paid = 1 After an insert or an update, you want Entity Framework to populate the entity with the values generated by the database. To create the model that supports this, do the following: 1. Right-click the project and select Add New Item. Add a new ADO.NET Entity Data Model. Import the ParkingTicket table. The resulting model should look like the one shown in Figure 12-15. Right-click on each of the scalar properties in the ParkingTicket entity. View the properties of each. Notice that the StoreGeneratedPattern property is set to Identity for the TicketId. For CreateDate and TimeStamp the StoreGeneratedPattern property is set to Computed. The StoreGeneratedPattern property for PaidDate is not set. Change this value to Computed.

There s plenty of detail on how to write good ICONIX style narrative use cases in Use Case Driven Object Modeling with UML: Theory and Practice, but for now we ll just assume we have one in this case, the Mapplet s Use Address use case:

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Figure 12-15. The model with the ParkingTicket entity Listing 12-12. Code to check if the database generated values are populated back to the properties on inserts and updates using (var context = new EFRecipesEntities()) { context.ParkingTickets.AddObject(new ParkingTicket { Amount = 132.0M, Paid = false }); context.ParkingTickets.AddObject(new ParkingTicket { Amount = 255.0M, Paid = false }); context.SaveChanges(); } using (var context = new EFRecipesEntities()) { foreach (var ticket in context.ParkingTickets) { Console.WriteLine("Ticket: {0}", ticket.TicketId); Console.WriteLine("Date: {0}", ticket.CreateDate.ToShortDateString()); Console.WriteLine("Amount: {0}", ticket.Amount.ToString("C")); Console.WriteLine("Paid: {0}", ticket.PaidDate.HasValue ticket.PaidDate.Value.ToShortDateString() : "Not Paid"); Console.WriteLine(); ticket.Paid = true; // just paid ticket! } // save all those Paid flags context.SaveChanges(); foreach (var ticket in context.ParkingTickets) { Console.WriteLine("Ticket: {0}", ticket.TicketId); Console.WriteLine("Date: {0}", ticket.CreateDate.ToShortDateString()); Console.WriteLine("Amount: {0}", ticket.Amount.ToString("C")); Console.WriteLine("Paid: {0}", ticket.PaidDate.HasValue ticket.PaidDate.Value.ToShortDateString() : "Not Paid");

dtReadXmlSchema(schemaFile); dtReadXml(xmlFile); return dt; } Another very nice new feature of the DataTable is the addition of a data reader factory method Here the DataTable learns a new trick from the Command object Command objects have always exposed the ExecuteReader method, which serves as a factory for provider-specific data readers The DataTable now exposes the CreateDataReader method, which will create a forwardonly cursor for us to traverse the DataTable data with The type it returns is a DataTableReader, which implements the IDataReader interface and so is type-compatible with data readers from other Managed Providers Let s say, for example, that you ve made caching data in your site a configurable behavior More specifically, you ve added a UseCaching entry to the appSettings of the webconfig (This entry is in the webconfig of the Web10 project.

BASIC COURSE:

Console.WriteLine(); } } The following is the output of the code in Listing 12-12: Ticket: 5 Date: 3/24/2010 Amount: $132.00 Paid: Not Paid

) <appSettings> <add key="UseCaching" value="false" /> </appSettings> When set to true, you re going to cache data on the web server so you don t need to go back to the database for it with every request When false, you re going to go back to the database with every request This strategy can be used effectively in combination with SQL Cache Dependencies (see 11) In either case, you want to bind to a data reader instead of a DataTable, so when you re not caching you don t take the hit of loading the entire result set up in memory Because the DataTable now returns a data reader-compatible cursor, a single method can account for both of these scenarios (from DataTableIEaspx in Web10) public IDataReader GetTitleReader() { bool caching = ConvertToBoolean( ConfigurationManager.

Ticket: 5 Date: 3/24/2010 Amount: $132.00 Paid: 3/24/2010

The user types an address using all address fields on the Quick Search window. The system enables the Locate button as soon as an entry is made in either one of these fields: City, State, Postal, Country. The user clicks Locate. The system geocodes the location based on the level of detail provided by the user and stores any candidates in an Address Candidate Collection. If a single candidate is found or exactly one of the multiple candidates has a 100% match rate, the system sets the AOI based on this Address Candidate.

Ticket: 6 Date: 3/24/2010 Amount: $255.00 Paid: 3/24/2010

AppSettings["UseCaching"]); DataTable dt = null; IDataReader dr; if (caching) dt = (DataTable)Cache["TitleData"]; if (dt == null) { string conn = ConfigurationManagerConnectionStrings["localPubs"]ToString(); SqlConnection cn = new SqlConnection(conn); SqlCommand cm = new SqlCommand("select * from titles", cn); dt = new DataTable(); cnOpen(); if (caching) {.

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