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Take a look at an example that uses the employee table in the AdventureWorks database. This is a classic example of a single-parent hierarchy with the managerId column identifying all employees who report to a specified manager. Let s look at a typical breadthwise hierarchical query used in SQL Server 2000 to retrieve all employees who reported to the manager whose managerId was 140. -- SQL Server 2000 example DECLARE @managerId int SET @managerId = 140 --holds the output treelevel, which lets us isolate a level in the looped query DECLARE @outTable table (employeeId int, managerId int, treeLevel int) --used to hold the level of the tree we are currently at in the loop DECLARE @treeLevel as int SET @treelevel = 1 --get the top level INSERT INTO @outTable SELECT employeeId, managerId, @treelevel as treelevel FROM HumanResources.employee as employee WHERE (employee.managerId = @managerId) WHILE (1 = 1) --imitates do...until construct BEGIN INSERT INTO @outTable SELECT employee.employeeId, employee.managerId, treelevel + 1 as treelevel FROM HumanResources.employee as employee JOIN @outTable as ht ON employee.managerId = ht.employeeId --this where isolates a given level of the tree WHERE EXISTS( SELECT * FROM @outTable AS holdTree WHERE treelevel = @treelevel AND employee.managerId = holdtree.employeeId) IF @@rowcount = 0 BEGIN BREAK END

Figure 10-32. Specifying the column mapping for the lookup You need to remember certain rules when you use this component: A noncapitalized word can be matched with a word that is capitalized at the beginning of a sentence. For example, the match between student and Student succeeds when Student is the first word in a sentence. If a plural form of the noun or noun phrase exists in the reference table, the lookup matches only the plural form of the noun or noun phrase. For example, all instances of students are counted separately from the instances of student. If only the singular form of the word is found in the reference table, both the singular and the plural forms of the word or phrase are matched to the singular form. For example, if the lookup table contains student, and the transformation finds student and students, both words are counted as a match for the lookup term student. If the text in the input column is a lemmatized noun phrase, only the last word in the noun phrase is affected by normalization. For example, the lemmatized version of doctors appointments is doctors appointment.

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SET @treelevel = @treelevel + 1 END SELECT FROM Employee.EmployeeID,Contact.LastName,Contact.FirstName HumanResources.Employee as Employee INNER JOIN @outTable ot ON Employee.EmployeeID = ot.EmployeeID INNER JOIN Person.Contact as Contact ON Contact.contactId = Employee.contactId

ToString method has an overload that takes a formatting string Once we ve got all these values, we can use them to create the XML document that will form the body of our message We build this by calling the stringFormat method, which allows us to insert parameters into the string in exactly the same way as ConsoleWriteLine: string time = DateTimeNowToString("yyyy-MM-ddTHH:mm:ssff+00:00"); string msgBody = stringFormat(@"< xml version='10' > <sysStatsMessage> <connections>{0}</connections> <cpuBusy>{1}</cpuBusy> <idle>{2}</idle> <ioBusy>{3}</ioBusy> <packErrors>{4}</packErrors> <packRecd>{5}</packRecd> <packSent>{6}</packSent> <totalErrors>{7}</totalErrors> <totalRead>{8}</totalRead> <totalWrite>{9}</totalWrite> <time>{10}</time> </sysStatsMessage>", connections, cpuBusy, idle, ioBusy, packErrors, packRecd, packSent, totalErrors, totalRead, totalWrite, time); Now we have the message body, we can go about sending it There are four basic steps to send a message on a new conversation using the Service Broker Interface: 1 Instantiate a Service object that represents the sending service 2.

Using CTEs, however, we get a much cleaner implementation: -- SQL Server 2005 syntax DECLARE @managerId int SET @managerId = 140; WITH EmployeeHierarchy (EmployeeId, ManagerId) AS ( SELECT EmployeeID, ManagerID FROM HumanResources.Employee as Employee WHERE ManagerID=@managerId UNION ALL SELECT Employee.EmployeeID, Employee.ManagerID FROM HumanResources.Employee as Employee INNER JOIN EmployeeHierarchy on Employee.ManagerID= EmployeeHierarchy.EmployeeID) SELECT FROM Employee.EmployeeID,Contact.LastName,Contact.FirstName HumanResources.Employee as Employee INNER JOIN EmployeeHierarchy ON Employee.EmployeeID = EmployeeHierarchy.EmployeeID INNER JOIN Person.Contact as Contact ON Contact.contactId = Employee.contactId

When a lookup item contains terms that overlap in the reference set that is, a subterm is found in more than one reference record the Term Lookup transformation returns only one lookup result. The Term Lookup transformation can match nouns and noun phrases that contain special characters, and the data in the reference table may include these characters. The special characters are : %, @, &, $, #, *, :, ;, ., , , !, , <, >, +, =, ^, ~, |, \, /, (, ), [, ], {, }, , and . Finally, each input column has an InputColumnType property that signifies how the column is handled as part of the task (see Figure 10-33).

So let s take this query apart and look at how it works. First, we define the name of the CTE and define the names of the columns that will be output: WITH EmployeeHierarchy (EmployeeID, ManagerID) AS (

Figure 10-33. My solitary input column InputColumnType = 2 The possible InputColumnType values are described in Table 10-23. Table 10-23. InputColumnType Values

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