Mark Johnston Development Lead - MSDN Microsoft Corporation TL42

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Content Providers Visual Studio SQL Server Exchange Office Windows KB Articles … SQL Servers IIS/Web Datacenter 1 Datacenter 2 Transactional Replication All Content is Stored in SQL Server

MERGE employee as target USING employee_changes as src ON src.loginid = target.loginid WHEN MATCHED THEN /* UPDATE */ UPDATE SET first = src.first,last = src.last WHEN NOT MATCHED THEN /* INSERT */ INSERT (loginid,first,last) VALUES(src.loginid,src.first,src.last) WHEN NOT MATCHED BY SOURCE THEN DELETE; /* DELETE */

Employee_changes “source” table Applied to loginidfirstlastage JohnAJohnAdams32 SteveCSteveCox25 BillSBillSmith51 loginIdfirstlastage JohnAJohnAdams31 SteveCSteveCox25 BobMBobMartin48 INSERT DELETE loginidfirstlastage JohnAJohnAdams32 SteveCSteveCox25 BillSBillSmith51 BobMBobMartin48 Employee “Target” result after MERGE UPDATE untouched This process is known as Delta Processing Employee “Target“ Table

Mark Johnston Development Lead - MSDN Microsoft Corporation

Mark Johnston Development Lead - MSDN Microsoft Corporation

Source loginidtypephoneNum JohnAcell JohnAhome JohnAWork Target loginidtypephoneNum JohnAcell JohnAhome SteveChome SteveCcell Need to fix the ON clause of the MERGE statement Problem #1: Error: target row matches more than one source row

SourceTarget Need to properly define the scope of the target UPDATE untouched INSERT DELETE Problem #2: Inadvertent rows are being deleted loginidtypephoneNum JohnAcell JohnAhome JohnAWork loginidtypephoneNum JohnAcell JohnAhome JohnAWork SteveChome SteveCcell

;WITH target AS (SELECT ep.* FROM EmployeePhone AS ep JOIN (SELECT distinct loginId from #t) t ON t.loginId = ep.loginId) MERGE target USING (SELECT * FROM #t) AS SRC ON SRC.loginid = target.loginid AND SRC.Type = target.type WHEN MATCHED AND (target.phoneNum <> SRC.phoneNum) THEN UPDATE SET target.phoneNum=SRC.phoneNum WHEN NOT MATCHED THEN INSERT (loginid, type, phoneNum) VALUES (SRC.loginid, SRC.type, SRC.phoneNum) WHEN NOT MATCHED BY SOURCE THEN DELETE; Untouched

InsertDelete Update Subset Insert Update SourceTarget Delete Subset

Mark Johnston Development Lead - MSDN Microsoft Corporation

dbo.EmployeeTableType insert values (N’JohnA’,N’John’, N’Adams’) dbo.EmployeePhoneTableType insert values (N’JohnA’,N’cell’, N’ ’) insert values (N’JohnA’,N’home’, N’ ’) insert values (N’JohnA’,N’work’, N’ ’) exec dbo.mergeEmployeeAndPhoneWithTVP

exec contentInsertUpdate … /*if update content then delete rows in related tables associated with content */ exec contentPrimaryDocInsert … … exec contentImageInsert … … exec contentMetaDataInsert … … /* there are 10 content related tables */

exec /* contentTableType /* primaryDocTableType /* imageTableType /* metaDataTableType */ … /* All data related to the content is passed into one stored procedure */

Mark Johnston Development Lead - MSDN Microsoft Corporation

EmployeeInsert EmployeeUpdate EmployeeDelete Employee EmployeePhoneInsert EmployeePhoneUpdate EmployeePhoneDelete EmployeePhone

EmployeeMerge Employee EmployeePhoneMerge EmployeePhone

EmployeeMerge Employee EmployeePhone EmployeeAddress

contentMerge content contentPrimaryDoc contentMetaData contentImage exec /* contentTableType /* primaryDocTableType /* imageTableType /* metaDataTableType */ …

Mark Johnston Development Lead – MSDN Microsoft Corporation

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Mark Johnston Development Lead – MSDN Microsoft Corporation

IF exists (select * from Product where productNumber = ‘AR-5381’) BEGIN update product set … where productNumber = ‘AR-5381’ END ELSE BEGIN INSERT product (…) SELECT ‘AR-5381’, … END Race condition