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You can even omit the column name if it s the same as the property name, ignoring case. (This is one of the sensible defaults we mentioned earlier.) For some cases you might need to use a <column> element instead of the column attribute. The <column> element provides more flexibility; it has more optional attributes and may appear more than once. The following two property mappings are equivalent:

functoid may not impact performance greatly, but consider the effect if you must run the Database Lookup functoid multiple times in a single map. Database Lookup functoids that are part of a looping structure will cause a level of performance degradation. Make sure that the latest BizTalk service packs are applied when using the Database Lookup functoid, as they include performanceenhancing features such as caching. Database support: Evaluate if the database that you must access will support the necessary security requirements and also allow table (or at least view level) access.

<property name="description" column="DESCRIPTION" type="string"/> <property name="description" type="string"> <column name="DESCRIPTION"/> </property>

have fixed items. Although we ll focus on the Watch window here, keep in mind that, except for the ability to add your own expressions, the other debugger windows offer mostly the same features.

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The BizTalk map translates the Database Lookup functoid information into a dynamic SQL SELECT statement If you run a SQL Profiler trace during testing of the BizTalk map, you will see the SELECT call with the dynamic SQL Knowing that dynamic SQL is created by the Database Lookup functoid allows you to use it to perform some relatively powerful database lookups The Database Lookup functoid allows only a single value and single column name to be referenced in the query However, with a bit of extra mapping, you can use this functoid to query against multiple columns.

The <property> element (and especially the <column> element) also defines certain attributes that apply mainly to automatic database schema generation. If you aren t using the hbm2ddl tool (see section 9.2, Automatic schema generation ) to generate the database schema, you can safely omit these. However, it s still preferable to include at least the not-null attribute, since Hibernate will then be able to report illegal null property values without going to the database:

Try It Out: Step Through an Application with the Watch Window Open Remember how we left the Friends Reunion application in break mode at the end of the previous exercise Well, we ll pick it up from there, and use the Watch window to check the current values of some variables in the application. 1. Open a Watch window (select Debug Windows Watch Watch 1 or press Ctrl+Alt+W, then 1). You ll use it to watch the connection string for the SqlConnection object. 2. Type the name of the variable as well as the property to show in the Name column: con.ConnectionString. The Watch window will show an error because the line declaring the variable (where you re paused right now) hasn t been executed yet. Therefore, the variable and its property don t exist yet.

The map in Figure 3 32 generates the following SQL query code: exec sp_executesql N'SELECT * FROM people WHERE ID= @P1', N'@P1 nvarchar(9)', N'172321176' This query performs a SELECT to retrieve all rows from the People table where the author ID is equal to the value in the inbound XML document (for example, 172321176) Keep in mind that the Database Lookup functoid returns only the first row that it encounters in the recordset If multiple authors had the same ID, you would potentially retrieve the incorrect author For example, if the author ID is the last name of the author, you may retrieve multiple authors that share the same last name One way to ensure uniqueness, aside from querying on a unique column, is to specify additional columns in the query.

Detection of illegal null values is mainly useful for providing sensible exceptions at development time. It isn t intended for true data validation, which is outside the scope of Hibernate. Some properties don t map to a column at all. In particular, a derived property takes its value from an SQL expression. Using derived properties The value of a derived property is calculated at runtime by evaluation of an expression. You define the expression using the formula attribute. For example, we might map a totalIncludingTax property without having a single column with the total price in the database:

3. Return to the code window. The VS.NET debugger should show yellow highlighting and the yellow arrow to indicate the next line to be executed.

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