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Object Services is one of two APIs in EF. Object Services enables you to execute CRUD operations with strongly typed objects and entity types. Object Services supports two execution models against the EDM: LINQ (specifically LINQ to Entities) and Entity SQL. This section covers the application of LINQ to Entities in EF. When looking at the usage of LINQ with EF, it is important that you first understand the ObjectContext class. In 5, you examined the AdventureWorksEntities class generated by EF. The AdventureWorksEntities class is an example of a class that extends the ObjectContext class. According to MSDN, the purpose of the ObjectContext class is for interacting with data in the form of objects that are instances of entity types defined in an EDM (http:// msdn2.microsoft.com/en-us/library/system.data.objects.objectcontext.aspx). This quote just about sums it up but to restate, the ObjectContext class is the conduit for interacting with the objects that are a representation of your database. This class also has the following functionality:

s You can see the full list of snmptrapd.conf configuration file options by displaying the snmptrapd. Tip

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This SQL allows you to quickly enter a column name that you want to query and list a summary of the number of times a particular value appears in a column. If this SQL were used to query the LAST_NAME field of the EMPLOYEES table described earlier in this chapter, you could view a list of the number of people with the same last name. If you work frequently on a specific set of tables, it might be worthwhile to save several table-specific SQL code templates. Suppose you have a table with more than a dozen columns. If you need to frequently write various SELECT statements that use most but not all of the columns, you could create a SQL code template something like this: SELECT COL1, COL2, COL3, COL4, COL5 FROM TABLE This saves you from having to retype all of the column names. You can quickly delete the columns you don t want to appear in the SELECT statement, and you don t have to copy and paste the SQL from some other location.

A database connection that is an EntityConnection object Object model metadata that is stored in the MetadataWorkspace object State management and object tracking, controlled by ObjectStateManager

You can run the daemon from the command line or via an init script. The Net-SNMP source package and most of the packaged versions, such as the RPM, come with init scripts for starting and stopping the snmptrapd daemon.

Next we need to install the SNMPTT tool. The SNMPTT tool is written in Perl and uses a number of functions provided with the Net-SNMP package. The tool can either be called from the command line or run as a daemon. I recommend that you run it as a daemon for better performance, and I ll demonstrate that method here. The SNMPTT tool has a number of prerequisites that must be installed for it to function: Perl version 5.6.1 or higher (the preferred version is 5.8.x) Net-SNMP version 5.1.1 or higher The Text::Parse::Words, Getopt::Long, Posix, Config::IniFiles, Time::HiRes, and Sockets CPAN modules

One simple and powerful feature of NetBeans is the ability to capture the schema of a database and link it to a project. This means that you don t need to use external database tools to export SQL scripts containing the Data Definition Language (DDL) for your application to files and then copy those files into your project or CVS. The only negative of the feature is that the schema is saved to a file as XML, not DDL, so you can t really open the file and use it elsewhere.

It is impossible to build a data-centric application if you can t retrieve data. In the preceding chapter, you built out a simple EDM with four tables and let EF generate the code associated with those structures. You also created a Windows Forms application to use as a test harness. Let s start by writing a simple query with the EDM that you generated in 5. Listing 6-1 provides a simple example using LINQ to Entities to retrieve all the EmployeeIDs in the EmployeeDepartmentHistory table. As you can see, the C# code is easy to understand because it is formed like a standard LINQ query. In this example, you have a new AdventureWorksEntities class, a LINQ select against the EmployeeDepartmentHistory entity, and finally a loop that iterates through the results, pulling the EmployeeIDs.

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