Download Data Access with SQL Server 2005 Mobile Edition and the

Data Access with SQL Server
2005 Mobile Edition and the
.NET Compact Framework
v2.0
Scott Colestock
Agenda
Overview – SQL Mobile Architecture
SQL Server 2005 Integration
Visual Studio 2005 Integration
Merge Replication
Overview
Device Data Access
Native Stack
Managed Stack
VS 2005 C++
VB .NET / C#
OLEDB CE
ADO.NET
SQL Server CE
Data Provider
OLEDB
Provider
CLR / .NET CF
QP / Cursor Engine / ES
Storage Engine / Replication Tracking
SQL Server Mobile Edition
Overview
Highly Integrated into Development
Tools
Integration with SQL Server 2005
DTS Support
Show Plan and Hints
SQL Server Management Studio
Integration with Visual Studio 2005
Ships with Visual Studio 2005
Database management functionality
Easy code upgrades from SQL Server CE 2.0
Overview
Architecture Improvements
Storage engine
Multiconnection support
Row level locking of data
Shares common memory pool
Auto-shrink support
Improved query processor
Cost-based optimization
Show plan and query hints
Scrollable, updatable cursor – SqlCeResultSet
Overview
Synchronization Improvements
Improved synchronization control
Multiuser synchronization
Progress notifications
Multiple subscriptions in the same database
Synchronization performance (w/SQL 2005)
Partitioned articles
Download-only tables
Column-level tracking
Overview
Introducing the SqlCeResultSet
Development Features
Included in SQL Mobile, ships with:
Visual Studio 2005
SQL Server 2005
Takes full advantage of SQL Server 2005 Mobile
Edition local capabilities
Extended Features
Scrolling access
Update in place
Random access
SQL Server 2005 Integration
SQL Server 2005 Tools
Business Intelligence Development Studio
Visual Tools for creating Data Transformation
Data Visualization
Enhanced Debugging
SQL Server 2005 Integration
SQL Server 2005 Tools
SQL Server Management Studio
Create SQL Mobile Databases
Show Plan and Hints
Faster Optimization
Enhanced Publication
Subscription Wizard
SQL Server 2005 Integration
Visual Studio 2005 Integration
Visual Studio Tools
Flexible
Development
Native and managed
development
environment
Visual Basic . NET,
Visual C++, Visual C#
all localized in the IDE
Targets multiple
devices
Visual Studio 2005 Integration
Visual Studio Tools
Rapid Development
Data designer support
via Visual Studio 2005
IDE
Drag and drop controls
onto form and
automatically bind
Visual Studio 2005 Integration
Visual Studio Tools
Library Evolution
SqlCeEngine,
SqlCeConnection,
SqlCeCommand,
SqlCeDataReader
SqlCeResultSet (new
updatable scrollable
cursor)
Visual Studio 2005 Integration
Synchronization
Goals of Synchronization
Simplify development of synchronization logic
Sync becomes a single line of code
Conflict resolution happens on the server through SQL
Server model
Share a common (mobile) data source
Allow multiuser access to the same data source
(that lives on the device)
Improve performance and data concurrency
More end-user versatility
Allows end users to change devices and still access the
data source
Synchronization
Overall Architecture
Application
SQL Mobile Client
Agent
HTTP
SQL Mobile Server
Agent
OLE DB
SQL Server
OLE DB
Provider
OLE DB
Internet Information
Services (IIS)
SQL Mobile Engine
Mobile
Database
SQL Server
Database
Synchronization
Outlining Your Options
SQL Server Mobile Edition provides two
synchronization solutions
Remote Data Access (RDA)
Merge replication
Both require server components that are on
IIS.
Remote Data Access
Overview
Loosely coupled connectivity between SQL Server
Mobile Edition and SQL Server
No configuration of the back-end Sql Server required
Client application specifies query to return data for a
local table (table-at-a-time metaphor)
Optionally tracks changes locally
Sends locally changed records back to SQL Server
The .NET Compact Framework provides managed
wrapper
SqlCeRemoteDataAccess
Remote Data Access
Using SqlCeRemoteDataAccess
An application must specify RDA
connectivity parameters
Web server information
URL – must include sqlcesa30.dll
Login and password
Local database information (SQL Mobile Edition
OLE DB connection string)
Proxy server login and password information
Remote DB info sent with each command
(SQL Connection String)
Remote Data Access
Pull Operation
Local table created including data and
schema
Optionally includes primary key
Optionally includes indexes
Values may come from a table or stored
procedure
Can retrieve all data for complete data set or…
Can filter data to reduce data size
View/stored procedure can reference only one table with a primary key
Remote Data Access
Pull Operation
Optionally track local changes
Changes can be later applied
Uses optimistic concurrency (no server data
locked)
Local table must not exist before pull
Created during pull operation
Error thrown if table exists
Remote Data Access
Using RDA Pull
Public Sub RDAPull()
Dim rda as New SqlCeRemoteDataAccess
Dim ServerOledbStr as String =
“Provider=sqloledb; Data Source=dataserver;” _
“Initial Catalog=Pubs;User Id=sa;Password=;”
rda.LocalConnectionString =
”Provider=Data Source=\My Documents\test.sdf”
‘ Set URL and IIS login/password.
rda.InternetUrl = “http://www.adventureworks.com/sqlmobile/sqlcesa30.dll”
rda.Pull(
“Authors”, _
“Select * from authors where state = ‘CA’”, _
ServerOledbStr, _
RdaTrackOption.TrackingOn)
End Sub
Remote Data Access
Push Operation
Sends changes back to server
All changes since last pull or push are applied
Changes applied to server indiscriminately
Table tracking must have been specified
during pull operation
Can choose if updates batched as one
transaction, or distinct
Can have conflicts logged in Errors table
Remote Data Access
Using RDA Push
Public Sub RDAPush()
Dim rda = New SqlCeRemoteDataAccess()
Dim ServerOledbStr as String =
“Provider=sqloledb; Data Source=dataserver;” _
“Initial Catalog=Pubs;User Id=sa;Password=;”
rda.LocalConnectionString = _
”Data Source=\My Documents\test.sdf”
‘ Set URL and IIS login/password.
rda.InternetUrl = “http://www.adventureworks.com/sqlmobile/sqlcesa30.dll”
rda.Push(
“Authors”,
ServerOledbStr,
RdaBatchOption.BatchingOn)
End Sub
Merge Replication
Overview
Provides data synchronization between SQL
Server 2005 Mobile Edition and SQL Server
SQL Server is the publisher
SQL Server 2005 Mobile Edition is the
subscriber
SQL Server 2005 Mobile Edition receives
initial snapshot from SQL Server
Both SQL Server 2005 Mobile Edition and
SQL Server can modify the data
Conflict resolution can be customized
Merge Replication
Overview
Changes reconciled on next synchronization
Local SQL Server 2005 Mobile Edition changes
sent to SQL Server
SQL Server changes sent to SQL Server 2005
Mobile Edition
SQL Server Management Studio wizards
Publishers created in studio
Subscribers create in studio
.NET Compact Framework managed
wrapper - SqlCeReplication
Merge Replication
Examining the Code
Public Sub SyncSubscription()
Dim repl as New SqlCeReplication()
repl.InternetUrl =
"http://Server1/SQLServerCE/sqlcesa30.dll"
repl.Publisher
= “SERVER1"
repl.PublisherDatabase = “CustmerInfo"
repl.PublisherLogin
= "sa"
repl.PublisherPassword = ""
repl.Publication
= "CustomerInfoPub"
repl.SubscriberConnectionString = _
”Data Source=\My Documents\MyLocalDB.sdf“
repl.Subscriber = “CustomerInfoSub"
repl.AddSubscription(AddOption.CreateDatabase)
repl.Synchronize()
End Sub
Merge Replication
Weighing the Costs
Several triggers and stored procedures added
Added to system tables
Adds more overhead
Replicated tables must have a ROWGUIDCOL
Ensures that rows are unique
Can avoid if rowguid column is added prior
Database must track all modifications
Additional tables added to system database
Tables used to track modifications
Can grow significantly
Merge Replication
Minimizing the Costs for Device
Applications
Key to success for device apps is minimizing
communication
Take only what you need
Apply filters
Static or Parameterized
Join
Column
Reducing the amount of data sent between
devices and server…
Reduces sync time
Improves responsiveness
Exploring Merge Replication
Making The Replication Choice
Recommendations
Remote Data Access
If you can’t modify the backend database…
If you have small tables to bring to the device…
If the tables you modify are distinct from those you
reference…
Choose merge replication
Bi-directional synchronization on all tables – only the
deltas are transferred
Much more flexible conflict resolution
For more on making the choice
http://msdn.microsoft.com/library/en-us/dnppcgen/
html/eff_arch_sql_servr_ce_rep.asp
“Comparing Remote Data Access (RDA) and Merge Replication” in
SQL 2005 BOL
Summary
SQL Server 2005 Mobile Edition
functionality is greatly enhanced for
developers
Integration with SQL Server 2005 makes
generation and maintenance of SQL Mobile
databases better
Integration with Visual Studio 2005 makes
developing of SQL Mobile applications
easier and faster
Remote data access vs. merge replication
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© 2004 Microsoft Corporation. All rights reserved.
This presentation is for informational purposes only. MICROSOFT MAKES NO WARRANTIES, EXPRESS OR IMPLIED, IN THIS SUMMARY.
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