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Listing 5-1. Using the ROUND, CEIL, and FLOOR Functions select round(345.678, 0), ceil(345.678), floor(345.678) from dual; ROUND(345.678) CEIL(345.678) FLOOR(345.678) -------------- ------------- -------------346 346 345 select , , from round(345.678, 2) round(345.678,-1) round(345.678,-2) dual;
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If you delete the second customer, you get an XML document because it will have a single root node again . As you can see from the examples so far, elements can have attributes . Attributes have their own names, and their values are enclosed in quotes . This is an attribute-centric presentation . However, you can write XML differently; every attribute can be a nested element of the original element . This is an element-centric presentation . Finally, element names do not have to be unique, as elements can be distinguished by their position; however, to distinguish between elements from different business areas, different departments or different companies, you can add namespaces . You declare namespaces used in the root element of an XML document . You can also use an alias for every single namespace . Then you prefix element names with a namespace alias . The following code is an example of element-centric XML that uses a namespace; the data is the same as in the first example of this chapter:
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xmlns:mstns="" xmlns="" xmlns:xs="" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" attributeFormDefault="qualified" elementFormDefault="qualified"> <xs:element name="address"> <xs:complexType> <xs:sequence> <xs:element name="street" type="xs:string" minOccurs="0" msdata:Ordinal="0" /> <xs:element name="number" type="xs:string" minOccurs="0" msdata:Ordinal="1" /> <xs:element name="city" type="xs:string" minOccurs="0" msdata:Ordinal="2" /> <xs:element name="state" type="xs:string" minOccurs="0" msdata:Ordinal="3" /> <xs:element name="zip" type="xs:string" minOccurs="0" msdata:Ordinal="4" /> </xs:sequence> <xs:attribute name="country" form="unqualified" type="xs:string" /> </xs:complexType> </xs:element> <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:EnforceConstraints="False"> <xs:complexType> <xs:choice maxOccurs="unbounded"> <xs:element ref="address" /> </xs:choice> </xs:complexType> </xs:element> </xs:schema> If the difference isn't obvious from looking at the source code, take a quick look at the file in the XML Editor, as shown in Figure 3-10.
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In the previous example, the CLR determines that System.Console is implemented in a different assembly than the caller . The CLR must search for the assembly and load the PE file that contains the assembly s manifest . The manifest is then scanned to determine the PE file that implements the type . If the manifest file contains the referenced type, all is well . If the type is in another of the assembly s files, the CLR loads the other file and scans its metadata
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Custom loggers are very easy to write and for the most part are easy to implement. Even still, if you are creating new loggers you may need to debug the behavior. Debugging custom loggers is very similar to debugging custom tasks. Just like debugging custom tasks, in the next list you will nd three methods that can be used to debug loggers: 1. Examine the contents of the log 2. Debugger.Launch() 3. Start MSBuild as External Program The simplest and least informative approach is the rst one, which entails simply examining the contents of the log to determine the behavior of the logger. If you decide to use this technique, you may want to set the verbosity of the logger to either Detailed or Diagnostic, if possible. This method can be used only for very simple issues and for those that allow the logger to be properly initialized. If there is an initialization error when creating a logger the build process is aborted and no log is written. Unlike the other approaches, this is non-interactive and there is no debugger. For the other two techniques, the Visual Studio debugger will be used. In second option, the Debugger.Launch() technique, is that when the statement is executed, a dialog will be shown to attach a debugger once you attach Visual Studio to the build process. This dialog is shown in Figure 5-12.
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Transactions allow you to define the boundaries of activity that will be considered atomic . You do so by enclosing the statements that you want to participate in the transaction in a BEGIN TRAN/COMMIT TRAN block . Note that in SQL Server the default behavior is to consider a statement that does not appear in an explicit transaction block to be its own transaction as if you enclosed that statement alone in a BEGIN TRAN/COMMIT TRAN block . Whenever you submit a change to the database, SQL Server first checks whether the pages that need to be affected already reside in cache . If they do, the pages are modified in cache . If they don t, they re first loaded from disk into the cache and modified there . SQL Server records the changes in the database s transaction log . Once in a while, a process called checkpoint flushes changed pages ( dirty pages ) from cache to the data portion of the database on disk . However, SQL Server will flush only changed pages for which the change was already recorded in the transaction log . This architecture allows SQL Server to maintain transactions . If a transaction is rolled back either explicitly or as a result of a failure SQL Server has in the transaction log all the information it needs to undo the changes that were not committed . SQL Server might also use the information from the transaction log for roll-forward recovery capabilities, not just rollback operations . During a roll-forward recovery phase, SQL Server replays committed transactions that were recorded in the transaction log but have not yet been applied to the data portion of the database . This activity takes place, for example, when SQL Server starts up . For every database, SQL Server looks for the last checkpoint recorded in the transaction log . All transactions that were committed after the last checkpoint was recorded will be rolled forward (which is known as the redo phase) . All open transactions for which a COMMIT TRAN was not recorded in the transaction log will be rolled back (which is known as the undo phase) . SQL Server 2008 brings the database online as soon as the redo phase which takes place first finishes . This feature is known as fast recovery . To demonstrate the different aspects of working with transactions in this chapter, I ll use the tables T1 and T2, which you create and populate in the testdb database by running the following code:
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As we have shown throughout this chapter, you can click Customizations in the Settings area and then click Customize the System to make immediate changes to the default solution in Microsoft Dynamics CRM. This approach is analogous to the customization approach used in previous versions of the software. You could also create one or more unmanaged solutions to make changes, and this approach is recommended over changing the default solution.
Not only are data source components designed to connect to data providers in a codeless way, but they also support a variety of sources using a single model.
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