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The syntax for creating a stored procedure that has no input or output parameters is as follows: CREATE PROCEDURE <procedure name> AS <stored procedure code> If the procedure already exists and you just want to update its code, use ALTER PROCEDURE instead of CREATE PROCEDURE. Stored procedures can have input or output parameters. Because GetDepartments doesn t have any parameters, you don t have to bother about them right now. You ll learn how to use input and output parameters in 5. In the following exercise, you ll add the GetDepartments stored procedure to your database.





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Listing 10-5. Returning an XSD Schema SELECT EmployeeID,FirstName,LastName FROM Employees FOR XML AUTO, XMLSCHEMA <xsd:schema targetNamespace="urn:schemas-microsoft-com:sql:SqlRowSet1" xmlns:schema="urn:schemas-microsoft-com:sql:SqlRowSet1" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes" elementFormDefault="qualified"> <xsd:import namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes" schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sqltypes.xsd"/> <xsd:element name="Employees"> <xsd:complexType> <xsd:attribute name="EmployeeID" type="sqltypes:int" use="required"/> <xsd:attribute name="FirstName" use="required"> <xsd:simpleType><xsd:restriction base="sqltypes:nvarchar" sqltypes:localeId="1033" sqltypes:sqlCompareOptions="IgnoreCase IgnoreKanaType IgnoreWidth" sqltypes:sqlSortId="52"> <xsd:maxLength value="10"/> </xsd:restriction> </xsd:simpleType> </xsd:attribute> <xsd:attribute name="LastName" use="required"> <xsd:simpleType> <xsd:restriction base="sqltypes:nvarchar" sqltypes:localeId="1033" sqltypes:sqlCompareOptions="IgnoreCase IgnoreKanaType IgnoreWidth" sqltypes:sqlSortId="52"> <xsd:maxLength value="20"/> </xsd:restriction> </xsd:simpleType> </xsd:attribute> </xsd:complexType> </xsd:element> </xsd:schema> <Employees xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1" EmployeeID="1" FirstName="Nancy" LastName="Davolio"/> <Employees xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1" EmployeeID="2" FirstName="Andrew" LastName="Fuller"/> .... As you can see, the XMLSCHEMA clause returns the XSD schema along with the data.

Note Alternatively, you can execute the GetDepartments.sql script file in the BalloonShop database,

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1. Make sure the data connection to the BalloonShop database is expanded and selected in Database Explorer. Choose Data Add New Stored Procedure. Alternatively, you can right-click the Stored Procedures node in Database Explorer and select Add New Stored Procedure. 2. Replace the default text with your GetDepartments stored procedure: CREATE PROCEDURE GetDepartments AS SELECT DepartmentID, Name, Description FROM Department 3. Press Ctrl+S to save the stored procedure. Unlike with the tables, you won t be asked for a name because the database already knows that you re talking about the GetDepartments stored procedure.

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Though the AUTO and RAW modes return data in XML format, you have very little control over the nesting and naming conventions of the returned data. The PATH mode, on the other hand, allows you to specify the nesting structure as well as element and attribute names by using simple XPath syntax. Suppose you wish to retrieve records from the Employee table in the format shown in Listing 10-6. Listing 10-6. Custom Nesting and Naming <Employee ID="1"> <Name> <FirstName>Nancy</FirstName> <LastName>Davolio</LastName> </Name> </Employee> Each record is to be returned as an <Employee> element. The EmployeeID column value is to be returned as the ID attribute of the <Employee> element. There should be an element named <Name> with two further sub-elements: <FirstName> and <LastName>. The <FirstName> and <LastName> elements should contain data from the FirstName and LastName columns, respectively. To retrieve XML data in this format, you can use the PATH mode as shown in Listing 10-7. Listing 10-7. Using the PATH Mode of the FOR XML Clause SELECT EmployeeID "@ID",FirstName "Name/FirstName",LastName "Name/LastName" FROM Employees FOR XML PATH ('Employee') As you can see, the SELECT query now specifies certain extra pieces of information along with the column names. We wish to return the EmployeeID column value as the ID attribute and hence the query adds @ID after the EmployeeID column. Similarly, the FirstName and the LastName columns are followed by the desired nesting and element names, that is, Name/ FirstName and Name/LastName, respectively. The name of the element generated is specified after the PATH mode in parentheses. Notice how the XPath syntax (@, /) is used to specify the attributes and element nesting.

Note Saving the stored procedure actually executes the SQL code you entered, which creates the stored

The EXPLICIT mode is possibly the most confusing mode of the FOR XML clause. On one hand it increases the complexity of the SELECT statement, but on the other it gives much more finegrained control on the resultant output.

procedure in the database. After saving the procedure, the CREATE keyword becomes ALTER, which is the SQL command that changes the code of an existing procedure.

4. Now test your first stored procedure to see that it s actually working. Navigate to the GetDepartments stored procedure node in Database Explorer and select Execute, as shown in Figure 4-13.

Note I will discuss the EXPLICIT mode only to the extent of giving a feeling of how it renders the XML













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