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Lessons learned You need to think about the complexity of LINQ to Objects queries. Because we deal with lists and loops, it s particularly important to try to spare CPU cycles if possible. Keep in mind that you should avoid writing queries that iterate collections more than once; otherwise your queries may perform poorly. In other words, you don t want to waste your time counting chocolate chips again and again. Your goal is to find the cookie quickly, so you can attack the next one without delay. You also need to take into account the context in which they will be executed. For example, the same scenario in the context of a LINQ to SQL query would be very different because LINQ to SQL interprets queries in its own way, which is dictated by what the SQL language supports. The conclusion is that you should use LINQ to Objects wisely. LINQ to Objects is not the ultimate solution for all use cases. In some cases, it may be preferable to use traditional approaches, such as for and foreach loops. In other cases, you can stick to LINQ, but it s better to create your own query operators for optimal performance. There s a lesson from the Python philosophy: write everything in Python for simplicity, readability, and maintainability, and optimize what you need in C++. The analog here is: Write everything in LINQ, and optimize when you must using domain-specific operators. In this section, we have mainly compared different solutions that use LINQ. In the next section, we ll focus on comparing LINQ solutions to traditional ones. The goal is to give you an idea of LINQ s overhead.

rcdContactProducts.FindFirst "SoldPrice > 200"

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dll) notifies the Group Policy client and the QoS Inspection Module that QoS settings have changed Next, the QoS Inspection Module (eQoS), which is a WFP packet-inspection component implemented in the TCP/IP driver that reacts to policy changes, retrieves the updated policy and works with the transport layer and QoS Packet Scheduler to mark traffic that matches the policy Finally, the QoS Packet Scheduler, or Pacer (%SystemRoot%\System32\Drivers\Pacersys), provides the NDIS lightweight filter functionality, such as throttling and setting the DSCP value, to control packet scheduling based on the QoS policies Pacer also provides the GQoS (Generic QoS) and TC (Traffic Control) API support for legacy Windows applications that used these mechanisms.

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To delete a row in an updatable recordset, move to the row you want to delete and then use the Delete method. For example, to delete the first row in the qryContactProducts query s recordset that hasn t been invoiced yet (the Invoiced field is false), enter the following:

LINQ to Objects is fantastic because it allows you to write code that is simpler to read and write. Coding some of the operations that LINQ to Objects allows on

Dim dbLawTrack As DAO.Database Dim rcdContactProducts As DAO.RecordSet Set dbLawTrack = CurrentDb Set rcdContactProducts = _ dbLawTrack.OpenRecordSet("qryContactProducts") rcdContactProducts.FindFirst "Invoiced = 0" ' Test the recordset NoMatch property for "not found" If Not rcdContactProducts.NoMatch Then rcdContactProducts.Delete End If

If you want to update rows in a recordset, move to the first row you want to update and then use the Edit method to lock the row and make it updatable. You can then refer to any of the fields in the row by name to change their values. Use the Update method on the recordset to save your changes before moving to another row. If you do not use the Update method before you move to a new row or close the recordset, the database discards your changes. For example, to increase by 10 percent the SoldPrice entry of the first row in the rcdContactProducts query s recordset whose SoldPrice value is greater than $200, enter the following:

Dim dbLawTrack As DAO.Database Dim rcdContactProducts As DAO.RecordSet Set dbLawTrack = CurrentDb Set rcdContactProducts = _ dbLawTrack.OpenRecordSet("qryContactProducts") rcdContactProducts.FindFirst "SoldPrice > 200" ' Test the recordset NoMatch property for "not found" If Not rcdContactProducts.NoMatch Then

rcdContactProducts.Edit rcdContactProducts![SoldPrice] = _ rcdContactProducts![SoldPrice] * 1.1 rcdContactProducts.Update End If

in-memory collections using classic constructs can be difficult. Often you d have to use tedious code with a lot of nested loops and temporary variables. You re

To insert a new row in a recordset, use the AddNew method to start a new row. Set the values of all required fields in the row, and then use the Update method to save the new row. For example, to insert a new company in the LawTrack Contacts tblCompanies table, enter the following:

Dim dbLawTrack As DAO.Database Dim rcdCompanies As DAO.RecordSet Set dbLawTrack = CurrentDb Set rcdCompanies = _ dbLawTrack.OpenRecordSet("tblCompanies") rcdCompanies.AddNew rcdCompanies![CompanyName] = "Winthrop Brewing Co." rcdCompanies![Address] = "155 Riverside Ave." rcdCompanies![City] = "Winthrop" rcdCompanies![StateOrProvince] = "WA" rcdCompanies![PostalCode] = "98862" rcdCompanies![PhoneNumber] = "(509) 555-8100" rcdCompanies.Update

Note that because all the main data tables in Contacts.mdb are linked tables, rcdCompanies is a dynaset recordset, not a table recordset.

Recordsets in ADO offer many of the same capabilities and options as recordsets in DAO, but the terminology is somewhat different. Because you will most often use ADO with data stored in a server database such as SQL Server, the options for an ADO recordset are geared toward server-based data. For example, ADO uses the term cursor to refer to the set of rows returned by the server. Fundamentally, a cursor is a pointer to each row you need to work with in code. Depending on the options you choose (and the options supported by the particular database server), a cursor might also be read-only, updatable, or forward-only. A cursor might also be able to reflect changes made by other users of the database (a keyset or dynamic cursor), or it might present only a snapshot of the data (a static cursor). To open an ADO recordset, you must use the Open method of a new ADO Recordset object. The syntax to use the Open method of a Recordset object is as follows:

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