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One sql: header elem ent can cont ain m ult iple par am et er specificat ions. Reference m or e t han one param et er in a t em plat e file by adding a sql: par am elem ent wit h a unique nam e at t r ibut e for each addit ional param et er .
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The follow ing XML docum ent illust rat es an ex t ension of t he preceding sam ple. A WHERE clause in t he T- SQL uses a param et er t o specify which row t o r et riev e from t he Shippers t able. Your applicat ion can specify t his value at run t im e by including t he par am et er s nam e and value in t he URL invok ing t he t em plat e file. Not ice t hat t he sql: param elem ent nam es t he param et er MyI D, and t he WHERE clause designat es t he param et er as @MyI D. The par am et er s default v alue is 1. <ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <!--tmpSelectShipperIDEquals.xml--> <sql:header> <sql:param name= MyID >1</sql:param> </sql:header> <sql:query> SELECT * FROM Shippers WHERE ShipperID=@MyID FOR XML AUTO </sql:query> </ROOT> Figur e 6- 12 shows a browser inv ok ing t he t em plat e file w it h it s result set . The URL t rails t he nam e for t he t em plat e file w it h a quest ion m ark ( ) . Then t he URL list s t he param et er nam e, an equal sign ( = ) , and t he param et er value, 3. I f you had addit ional param et ers t o specify , you could delim it t hem from one anot her wit h an am persand ( &) . Each param et er designat ion follows t he sam e form at : param et er nam e, equal sign, param et er value. Failing t o specify a param et er at run t im e ret ur ns t he row wit h a Shipper I D v alue of 1. I f your t em plat e file didn t specify a default value, t he result set w ould be em pt y. ( No error m essage is ret ur ned.) Figu r e 6 - 1 2 . A sam p le de m on st r a t in g t h e sp ecificat ion of a p a ra m et e r in a URL in vok in g a t e m p la t e file t o r e t u rn a r ow fr om t h e Sh ipp er s t a ble .
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XML t em plat e files wit h T- SQL don t rest r ict y ou t o ret r iev ing dat a. You can perform dat a m anipulat ion and even ot her t asks. The t r ick is t o use t he proper TSQL code and associat e a login wit h t he v irt ual dir ect or y t hat has per m ission t o perform t he t asks y ou program in t he t em plat e file. ( Chapt er 7 exam ines SQL Ser ver secur it y. ) For ex am ple, associat ing a login in t he sysadm in fix ed serv er role enables t he ex ecut ion of t he next sam ple ( as well as t he updat egram sam ples in t he chapt er s closing sect ion) . Using T- SQL in a t em plat e file is a very rich appr oach because y ou can accom plish anyt hing t hat T- SQL perform s ( pr ov ided y our login account has pr oper perm ission) . The next t em plat e file shows how t o use t he I NSERT and DELETE st at em ent s t o first add and t hen r em ove a r ecord fr om t he Shippers t able. The t em plat e file m onit ors t he st art ing, int erm ediat e, and ending st at es of t he Shippers t able wit h a ser ies of SELECT st at em ent s. I n addit ion, t he T- SQL scr ipt in t he t em plat e file reseeds t he I DENTI TY propert y for t he Shippers t able so t hat t he added r ecord always appears w it h a ShipperI D value of 4 inst ead of a pr ogression of values, such as 4, 5, 6, on successive execut ions of t he t em plat e file. This sam ple is inst ruct ive because it shows t he use of t he DBCC CHECKI DENT st at em ent , w hich is neit her a dat a r et riev al nor a m anipulat ion st at em ent . <ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <!--tmpInsertAndDelete.xml--> <sql:query> SELECT Shippers before an insert SELECT *, Before Insert as At FROM Shippers FOR XML AUTO INSERT INTO Shippers (CompanyName, Phone) VALUES ( foo , (123) 45 6-7890 ) SELECT Shippers after an insert SELECT *, After Insert as At FROM Shippers FOR XML AUTO DELETE FROM Shippers WHERE ShipperID > 3 SELECT Shippers after deleting records with ShipperID > 3 SELECT *, After Delete as At FROM Shippers FOR XML AUTO <!--Reseed Identity for Shippers table so it starts from 3--> DBCC CHECKIDENT (Shippers, RESEED, 3) </sql:query> </ROOT> Figur e 6- 13 shows t he r esult set s fr om t he SELECT st at em ent s in t he preceding XML t em plat e file one befor e t he insert , anot her aft er t he insert , and a final one aft er t he delet e. Not ice t hat t he new record appears in t he m iddle result set . No m at t er how m any t im es you rerun t he t em plat e file, t he ShipperI D value for t he new record w ill always be 4. I f y ou st art ed w it h an init ial I DENTI TY value gr eat er t han 3, t he first run of t he t em plat e file w ill reflect t he higher value, but all subsequent successiv e r uns w ill act as if t he last I DENTI TY value wer e 3. This behav ior reflect s t he im pact of t he DBCC CHECKI DENT st at em ent at t he close of t he T- SQL script in t he t em plat e file.
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Figu r e 6 - 1 3 . Th is br ow se r sh ow s t h e im pa ct of a T- SQL scr ipt in a n X M L t e m pla t e file t h a t a dds a n d t h e n r e m oves a row fr om t h e Sh ip per s t ab le .
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