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Using New Data Types in 2008

Using New Data Types in 2008. Andrew Couch UK Access User Group www.ukaug.co.uk ASC associates www.upsizing.co.uk. Flow of Presentation. Data types and products Share Point : Access & SQL Server SQL Server : Access & Visual Studio SQL Server New Data Types

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Using New Data Types in 2008

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  1. Using New Data Types in 2008 Andrew Couch UK Access User Group www.ukaug.co.uk ASC associates www.upsizing.co.uk

  2. Flow of Presentation • Data types and products • Share Point : Access & SQL Server • SQL Server : Access & Visual Studio • SQL Server New Data Types • Updating Data & Multi-user Issues • Summary

  3. Why are we interested in Data Types? • What we do with data • Exchange • Converting and exchanging data between products • Applications that present data • Linking applications to back-end data sources • Applications that maintain data • updating data with applications linked to back-end data source

  4. Which Products will we consider? • Products • Access • Application and data source • SQL Server • data source and application components, also report services • Share Point • Application and data source (SQL Server) • Visual Studio • Application

  5. What Data Types do the Products support? SQL Server (2008) Access (2007) Visual Studio (2005/8) GUID Multi-value fields Share Point (2003)see next slide n prefix for Unicode

  6. Share Point (2003)

  7. Share Point under the hood Data is held in the AllUserData table which has a generic set of fields, nvarchar1,nvarchar2......Text1,Text2.........

  8. Access to Share PointData Types; MOSS

  9. Access (2007) & Share Point • Attachments (share point lists) • Multi-value fields (share point lists)

  10. Share Point a Data/Object Model; WSS • http://msdn2.microsoft.com/en-us/library/ms480101.aspx

  11. Access to SQL Server Data Type Mappings • Yes/No (boolean) : bit • Access True -1, SQL Server True 1; also SQL Server boolean is tri-state 0, 1 and NULL • Text : varchar or nvarchar or char or nchar • Date/Time : datetime • Currency : money • Autonumber : int (identity property) • OLE Object : image, varbinary, filestream • Memo : text or varchar(max) • Number : various mappings

  12. Access Yes/No Data

  13. Yes/No (without a default)Translated To SQL Server

  14. Access Memo and OLE Data Types

  15. Access Using SQL Server IMAGE and TEXT Data Types

  16. Visual Studio Editing Records in DetailsView; issues with Text Data Type

  17. Visual Studio and Image/OLE Data issues with Image Data Type

  18. Access & SQL server Varchar(max) and Varbinary(max)

  19. Visual Studio DetailsView now works for Updates when using Varchar(max)

  20. Visual Studio, Images and OLE still a problem with Varbinary(max) some people would suggest that image data should not directly held in the database and instead a text link is used to point to an external image file which works around this issue

  21. Mini-summary • Access to SQL Server • MEMO to VARCHAR(max) or TEXT, probably TEXT safer bet but VARCHAR(max) more flexible • OLE to IMAGE or VARBINARY(max), FILESTREAM ? • Visual Studio • VARCHAR(max) a better choice • OLE/IMAGE data doesn’t work for bound controls

  22. SQL Server (2005) • XML data type • office requires program code using new SQL Native Client drivers to manipulate this • varchar(max), nvarchar(max) • advantages for programmers as can use as a variable (not possible with older text data type) • varbinary(max)

  23. Date & Time Data • IBM DB2 • DATE, TIME and TIMESTAMP date range 0001-01-01 to 9999-12-31 • Oracle • DATE (includes time), TIMESTAMP, date range January 1 4713 BC to 9999-12-31 • SQL Server (2000/2005) • DATETIME, SMALLDATETIME, date range 1753-01-01 to 9999-12-31 for DATETIME, when no date given defaults to 1st January 1900 • Access – DATE/TIME • date range 1-1-100 to 9999-12-31,when no date given defaults to 30th December 1899 and hides date • SQL Server (2008) • DATE, TIME,DATETIME2, DATETIMEOFFSET range 0001-01-01 00:00:00:0000000 to 9999-12-31 23:59:59:9999999

  24. Access allowing Updates to new Date and Time Data Types

  25. Searching • some limitations where fields are strings

  26. Controlling Time Precision

  27. SQL Server (2008) • Filestream • Unstructured large object data • DATE and TIME • Dates from 01/01/0001 to 31/12/9999 • Times accurate to 00:00:00:0000000 • DATETIME2 and DATEOFFSET • New combined date and time data types with higher accuracy, Combines above, offset type includes time-zone data • HIERARCHYID • Optimised for data hierarchies (special functions) • GEORGRAPHY and GEOMETRY • .NET-based spatial data • First deals with round-earth co-ordinates, second uses a flat-earth style of co-ordinates • Special functions

  28. Geography • It comes as no surprise that this renders in a binary type format and you can’t edit it • Stored procedures and pass through queries to the rescue!

  29. With a little Magic

  30. Geography Methods

  31. Timestamps & Multiple Users Overwrite data when changed SQL Server Optimistic row versioning Timestamp checking Visual Studio does not utilise timestamps on bound controls the new LINQ will support timestamp concurrency

  32. Access Row Versioning & Timestamps Row Versioning SQLExecDirect: UPDATE "dbo"."authors" SET "au_fname"=? WHERE "au_id" = ? AND "au_lname" = ? AND "au_fname" = ? AND "phone" = ? AND "address" = ? AND "city" = ? AND "state" = ? AND "zip" = ? AND "contract" = ? Timestamps SQLExecDirect: UPDATE "dbo"."authors" SET "au_fname"=? WHERE "au_id" = ? AND "ts" = ? Timestamps improve efficiency and remove potential problems with rounding errors in numerical data

  33. Example Visual Studio Update handling Null Values UpdateCommand = "UPDATE [Customers] SET [CustomerID] = @CustomerID, [CompanyName] = @CompanyName, [ContactName] = @ContactName, [ContactTitle] = @ContactTitle, [Address] = @Address, [City] = @City, [Region] = @Region, [PostalCode] = @PostalCode, [Country] = @Country, [Phone] = @Phone, [Fax] = @Fax WHERE [CustomerID] = @original_CustomerID AND [CompanyName] = @original_CompanyName AND COALESCE([ContactName],'') = COALESCE(@original_ContactName,'') AND COALESCE([ContactTitle],'') = COALESCE(@original_ContactTitle,'') AND COALESCE([Address],'') = COALESCE(@original_Address,'') AND COALESCE([City],'') = COALESCE(@original_City,'') AND COALESCE([Region],'') = COALESCE(@original_Region,'') AND COALESCE([PostalCode],'') = COALESCE(@original_PostalCode,'') AND COALESCE([Country],'') = COALESCE(@original_Country,'') AND COALESCE([Phone],'') = COALESCE(@original_Phone,'') AND COALESCE([Fax],'') = COALESCE(@original_Fax,'')"

  34. Summary • We have a diverse set of data types in the different products • Need to test data types for product compatibility, don’t forget different versions and drivers can have an impact • Access and Share Point very good compatibility • Access and SQL Server good compatibility • Share Point data easily exported and linked MOSS but WSS more difficult • Please, Please can I have a nice tree presentation for XML data, then I may be tempted to use it!!!!!! • SQL Server 2008 new data types hold great promise, and it will possible to do a lot with then in Office 2007

  35. ASC Associates • Software consultancy specialising in Access, SQL Server and .net applications • Migration Upsizing SQL Tool • MUST • upsizes Access databases to SQL Server • MUST+SQL • converts Access queries to views and stored procedures • MUST+Web • converts Access forms to web forms in Visual Studio projects • www.upsizing.co.uk • andy@ascassociates.biz

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