Download SQL / CE - Piper Jaffray

Developing Mobile Applications
Tim Heuer
Immedient
[email protected]
Bert Solano
Immedient
[email protected]
Agenda
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Mobile Overview
VS .NET Features
Data Storage Options
Tips and Tricks
CE Devices are available
Mobile vs. Wireless
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Mobile Architectures
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Application can function in a vacuum
“Synchronize When You Can”
Wireless
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Tethered to the data source, just like
wired, only we use wireless
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WiFi, CDPD, GPRS,
Prone to problems
Mobile Apps leverage Wireless
Wireless is NOT Mobile
Goal for a Mobile App

Can your user function from the
bottom of the ocean?
(… with a waterproof device)
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Is your application as reliable as their
paper notebook?
Take advantage of the internet, don’t
depend on it.
Compatibility Challenges
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Many different device types
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Different form-factors
Human interface choices
Connectivity choices
WiFi
Network Cradle
Compact Flash
WWan Desktop Cradle
Infra Red
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On-device resources vary widely
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ROM/RAM capacity
File system
Battery life
Mobile Development
Environment
Single set of familiar
productive tools for all
development
Server components
Rich client applications
Mobile Web development
Building Web services
Consuming Web services
Easily take advantage of
all Microsoft mobile
platform assets
Mobile Development
Approaches
Client
Application
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Web
Application
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Application
on device
Device specific
Fewer devices

Application
on server
Runs in browser
Many devices
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Offline options
Richest UI
Online only
Less UI choice
Easy to deploy
Mobile Development
Tools
Today
Client
Application
Web
Application
Embedded
Visual Tools
eVB and eVC++
Device-specific
Active Server
Pages
Visual Studio
&
.NET Compact
Framework
Visual Studio &
Mobile Internet
Toolkit
Mobile Internet Toolkit
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Components
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Mobile controls
Mobile designer
Rich device identification
Rapidly develop Mobile Web
Applications
Powerful and flexible
Easy to customize and extend

For future devices
Mobile Controls
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Render based on device capabilities
Automatically output multiple markup
languages
Built upon ASP.NET control base
classes
Common controls:
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Label
TextView
Link
Calendar
.NET Compact Framework
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Smart Device Extensions
A subset of the .NET Framework
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Lightweight and Resource Efficient
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Same programming model
Same security as desktop programming model
RAM
Battery and CPU usage
Flash and ROM
Rich PocketPC Functionality
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Windows Forms (WinForms)
ADO.NET Data Access
XML Web Services Client
With Windows CE
Windows CE Device
XML Web
Services
Windows
Forms
Windows UI
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Data and XML
XML Web Services
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Base Class Library
Take advantage of Windows richness
Windows NT® network integration
Data Access

Common Language Runtime
Standard Windows look and feel
Forms-based UI
All the standard controls
Significant subset for small size
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Local data (offline)
Remote data (online)
Simple structured files (text)
Device Compatibility
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.Net Compact Framework
 Faithful
implementation of Standard CLI
 Core types and methods + device
extensions
Microsoft Full .NETto
Framework
 Subset of .Net framework appropriate
Desktop
smart device development
Microsoft .NET Compact Framework
Pocket PC (CE)
Microsoft .NET Compact Framework
Smart Phone
ISO/IEC 23271:2002 / ECMA 335
Microsoft Windows CE Extensions
IRDA, Barcode Scanner, etc
Common Language Infrastructure
It’s All About Balance
(Developer Perspective)
This is NOT the desktop, think 100mhz
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Features
Amount of Data
Garbage Collection
Data Entry/Selection
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Performance
Memory Usage
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Data, Objects
Connectivity
Device Databases
Microsoft Strategy
Scalable Solutions
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Scalable Solutions
SQL Server
MSDE
SQL Server CE
}
Server,
Desktop,
Tablet PC
CE Platform
SQL Server CE
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Database for the CE / Pocket PC Platform
Similar programming style to SQL Server
Limitations are more device then SQL/CE
1 Connection/ Database, (usually not a problem)
Multiple Databases per device
No Stored procs
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Use cached DataCommands
Referential Integrity with cascading updates/Deletes
Stand alone, or replicate/sync with SQL Server
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(SQL CE)
SQL Server not required, but best match
SQL Server CE 2.0 designed for .NET Compact
Framework (System.Data.SqlServerCe)
Replacement of Pocket Access, just like DBF/Access
CE Data Access Storage Architecture
.NET CF / Managed Stack
Native/Unmanaged Stack
eVB
3.0
ADO
CE
v3.1
VS .NET (VB.NET, C#)
ADO.NET
eVC
3.0
SQL Server
CE Data
Provider
SQL Server
Client Data
Provider
CLR / .NET CF
Ethernet
TDS
Well
Connected
OLEDB CE
SQL CE Edition v2.0
Data Provider
OLEDB
QP/Cursor Engine/ES
OLEDB
Client
Agent:
Replication
and
RDA
Storage Engine / Repl
Tracking
802.11b,
CDPD,
GSM,
CDMA,
TDMA, etc.
IIS
HTTP
Occasionally
Connected
CLIENT
SERVER
OLEDB /
Replication API
Server
Agent:
Replication
and
Remote
Data
Access
Setting up SQL
CE Replication
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Basic Replication setup +
Install SQL CE Replication Tools
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http://www.microsoft.com/sql/downloads/ce/sp3.asp
Test connectivity from device
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Localhost won’t work
NETBIOS name may not work (WINS Resolution)
Test with IP or Fully Qualified Domain Name
If you don’t get this response from the DLL, don’t go any further
http://192.168.1.100/Repll/sscesa20.dll
SQL / CE – Data Transfer
Multiple Techniques

RDA
system.Data.SqlServerCe.SqlCeRemoteDataAccess
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Merge Replication Over IIS
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System.Data.SqlServerCe.SqlCeReplication
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Great for managing concurrency
ADO.net System.Data.SqlClient.SqlCommand

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Great for semi-connected environments, large data
transfers
Can call SQL Server directly, but not a great idea…* (*Not a
Mobile Architecture)
Web Services

Great when concurrency isn’t an issue, or server isn’t SQL
Supported ADO .NET And XML
Classes On .NET CF
XmlDocument
DataView
XmlReader
DataSet
XmlWriter
XML File
SqlDataReader
SqlCeDataReader
SqlDataAdapter
SqlCeDataAdapter
SqlCommand
SqlCeCommand
SqlConnection
SqlCeConnection
.NET Data Provider
.NET Data Provider
for SQL CE
for SQL Server
Parsing Exceptions
public static void ShowErrors(SqlCeException se)
{
SqlCeErrorCollection errorCollection = se.Errors;
StringBuilder exInfo= new StringBuilder();
Exception inner = se.InnerException;
foreach (SqlCeError err in errorCollection)
{
exceptionDetailStringBuilder.Append("\n Error Code: " + err.HResult.ToString("X"));
exceptionDetailStringBuilder.Append("\n Message : " + err.Message);
exceptionDetailStringBuilder.Append("\n Minor Err.: " + err.NativeError);
exceptionDetailStringBuilder.Append("\n Source : " + err.Source);
foreach (int numPar in err.NumericErrorParameters)
{
if (0 != numPar) exceptionDetailStringBuilder.Append("\n Num. Par. : " + numPar);
}
foreach (string errPar in err.ErrorParameters)
{
if (String.Empty != errPar) exceptionDetailStringBuilder.Append("\n Err. Par. : " + errPar);
}
MessageBox.Show(exceptionDetailStringBuilder.ToString());
exceptionDetailStringBuilder.Remove(0, exceptionDetailStringBuilder.Length);
}
}
Mobile Application
Tips and Tricks
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Always think Performance, …always
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Test performance on everything
Get the actual device
Design and Proof of Concept
EVERYTHING
Get a wireless Lan for debugging
Reuse everything you can
Database optimization is KEY
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Don’t assume flat is good. Balance of
normalization is good
Don’t assume your .sdf needs to have the
same structure as the server
Tips and Tricks
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This is NOT a 1.8GHZ Processor
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Be kind to your environment
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protected override void
OnClosing(CancelEventArgs e)
{
this.Save();
e.Cancel = true;
this.Hide();
base.OnClosing (e);
}
Use DataSets to cache data …more to come…
Save Forms that will be used again
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Reuse Everything
Pre-Load Data
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Think 100MHZ
Use a forms collection that caches forms
Toss objects that you don’t use often
Don’t try to load 9 MB of data onto a device
with 8 MB of RAM
Resources
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Newsgroups:
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microsoft.public.dotnet.framework.compactframework
http://www.gotdotnet.com/team/netcf
SQL CE
 http://www.microsoft.com/sql/ce/
 http://www.microsoft.com/sql/ce/techinfo/defa
ult.asp
 Article on Setting up a sample Replication and
RDA
http://msdn.microsoft.com/library/default.asp?
url=/library/en-us/dnsqlce/html/sqlwince.asp
Q&A