Tech Days09 Sqldev

SQL Server 2008 for .NET Developers Lynn Langit – Developer Evangelist – Microsoft http://blogs.msdn.com/SoCalDevGal

What Will We cover? SQL Server Spatial support BLOB storage (Filestream) T-SQL Enhancements Table-valued parameters New date / time More Visual Studio integration SQL CLR Business Intelligence Reporting Services More

What is Spatial Data? Location-based questions Which roads intersect property or each other? How many stores/restaurants/houses/car dealerships are located within a geographical area? Spatial Data Types Geometry Flat Earth model & X, Y coordinates Geography Round Earth model uses Latitude and Longitude coordinates Can span only one logical hemisphere (more will throw exception) Query for location info as any SQL Server data type Data types dictated by OpenGIS standard New spatial index type

Representing Spatial Data Geospatial data in SQL Server Stored in proprietary binary format Can be input using simple text Parse methods convert text into internal storage format Represents areas using Points, Linestrings, Polygons MultiPoints, MultiLinestrings, MultiPolygons GeomCollections Define Polygons in counter-clockwise direction Interior areas (“holes”) must be defined in clockwise direction Supports various calculations and methods Spatial Reference ID (SRID) identifies ellipsoid (flat/round, meters/feet) Only instances with like SRID can be directly compared

SQL Server Geospatial and Virtual Earth

About BLOBs 1. Old way #1 Store BLOBs in DB as varbinary (max) up to 2 GB each Easier management, but can be poor performance 2. Old way # 2 Store BLOBS in File system, path (link) in db Good performance, but complex management 3. New way Best of both via Filestream attribute Applied to varbinary(max) data type Integrated database security Uses dedicated Filegroup (easier maintenance) Limits *no snapshots or mirroring and more

Using Filestream 1. Enable Filestream for the machine For T-SQL access For file I/O streaming access Name of share for storage For streaming remote clients Required integrated security 2. Enable Filestream for the server instance sp_configure filestream_access_level, (0, 1, 2) Can limit to T-SQL access only (option 1) 3. Create Filestream-enabled database FILEGROUP FgName CONTAINS FILESTREAM (NAME = …) Name is the directory (storage) name Name (i.e. folder) must NOT exist prior to creating DB Create table with Filestream column(s) With specific requirements, next slide>>

Filestream Columns Tables with Filestream columns must… Contain a Uniqueidentifier column that is Not nullable Uses the ROWGUIDCOL attribute Max one per table Has a unique constraint on it Can have more than ‘Filestream’ column Varbinary(max) with Filestream attribute Will probably have a default value assigned Can be manipulated using T-SQL OpenSqlFilestream function - sample Performance comparison here

Enhancements to T-SQL Table Value Parameters New Date/Time types Time zone awareness New MERGE keyword New shorthand notation

Table Value Parameters CREATE TYPE as TABLE Multiple tables inserted/updated within single transaction (MARS-like capability for writing) Can pass strongly-typed arrays to stored proc as single call ADO.NET updated to include support Param type: SqlDbType.Structured Can use PK, Unique, Check constraints Index only for PK or Unique, no stats Can specify the sort order Can NOT use Defaults

When to use TVPs TVPs Pass large number of rows – uses tempdb Results in simpler CRUD stored procs READONLY after initial population Temp table or CTE CTEs – no indexing, in memory (unless out of memory, then in tempdb) Can not pass as param

T-SQL Enhancements Table Valued Parameters

Dates and Time Several new types added datetime2 date time datetimeoffset New functions added CONVERT SYS* Functions DATEDIFF

MERGE Insert, Update, Delete with one keyword Merge two tables, source and target WHEN MATCHED WHEN TARGET NOT MATCHED WHEN SOURCE NOT MATCHED Syntax and use can be complex MERGE syntax from SQL Server BOL

Shorthand Notation Like .NET languages (C# or Visual Basic .NET) Declare variable & assign value in one line of code Compound assignment, i.e ‘+=‘, etc..

T-SQL Enhancements Date/Time, Merge, Shorthand

Visual Studio Integration Enhanced project types Analysis Services Integration Services Reporting Services Entity Framework CLR Integration

Entity Framework Models relational data using entities (OR/M tool) Can model any relational data source for data access (provider may be required) Application-specific domain You can work at a higher level of abstraction Appropriate amount of information returned Lazy-loaded What is an entity? Structurally like an object (noun) Has scalars and relationships Has identity Not tied specifically to SQL Server

Visual Studio Integration Entity Framework

SQL CLR SQL CLR is “off by default” for security reasons Must activate (instance) then per database to enable Code executes in SQL Server processing stream SQL Server has the ability to execute managed code Stored procedures & Triggers User-defined Types & Aggregates – extended size (up to 2 GB) Regular Functions & Table value functions Use mostly for complex processing Use for Functions or Aggregates Do not use for CRUD operations

Programming SQL CLR Use Visual Studio templates for SQL CLR constructs Uses Database project type Can be remotely debugged Metadata (attributes) control SQL Server behavior Microsoft.SqlServer.Server.xxx SqlProcedure, SqlFunction, SqlUserDefinedAggregate, SqlTrigger, SqlUserDefinedType, SqlFacet, SqlMethod Microsoft.SqlServer.Server namespace (retrieves/returns data) Very ADO.NET-like, but not ADO.NET Uses SqlContext.Pipe Assign CAS permission set (Safe, External, Unsafe) Use for complex processing, i.e. RegEx parsing, etc…

Visual Studio Integration SQL CLR

Business Intelligence SSAS – Analysis Services Date storage and query OLAP cubes or Data Mining Structures BIDS to create SSMS to administer SSIS – Integration Services ETL tool SSRS - Reporting Services Enterprise Reporting BI can use any data source Data Warehousing Data Mining

Reporting Services SQL Server standard for reporting Managed enterprise reporting Ad-hoc reporting Embedded reporting Web-based reporting Included in SQL Server 2008 Express w/Advanced Services Reports can be formatted in a variety of ways PDF, Word 2007, HTML Reports are exposed via a Web Service Can be integrated with SharePoint Dependency on IIS removed (uses http.sys)

Programming Reports Design reports in Visual Studio 2008 SP1 Query for data Assign query results to report Design report style Colors, Fonts, etc… Deploy report Web Service SharePoint Services Wizard available for initial report design – also Report Builder Enhanced configuration and administration tool

Visual Studio Integration Reporting Services and more

But there’s more… For Developers Change Data Capture Filtered Indexes Hierarchy ID ( ) Sparse data columns XML Enhancements Integrated Full-Text Search For Administrators Policy-based management Auditing enhancements Transparent Encryption Compression PowerShell integration More…

Microsoft Press Publications Lynn’s blog http://blogs.msdn.com/SoCalDevGal

Get Microsoft Software for FREE For high school and college students - DreamSpark For startup businesses - BizSpark For everyone - Express editions – VS and SQL - here

Tech Days09 Sqldev

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