Windows Mobile: Data Access and Storage Vinod Kumar M Technology Evangelist Microsoft India http://blogs.sqlxml.org/vinodkumar http://www.ExtremeExperts.com

Where We’re Going today What’s New In… Changes in SQL Mobile Direct Data Management Connectivity and Data Transfer Tools and Productivity Enhancements

Changes in SQL Mobile

Direct Data Management

Connectivity and Data Transfer

Tools and Productivity Enhancements

Changes in SQL Mobile

Changes in SQL Mobile Key new features Multi-user Support Can now access the same database from multiple programs simultaneously Improved Query Processor More optimized No longer necessary to Compact to update statistics

Multi-user Support

Can now access the same database from multiple programs simultaneously

Improved Query Processor

More optimized

No longer necessary to Compact to update statistics

Changes in SQL Mobile Desktop Support SQL Mobile now available on the Desktop Databases can now be created on the desktop Can now transfer a database using ActiveSync (no server engine required) Can now administer database from desktop

SQL Mobile now available on the Desktop

Databases can now be created on the desktop

Can now transfer a database using ActiveSync (no server engine required)

Can now administer database from desktop

Changes in SQL Mobile Smartphone Smartphone now supports SQL Mobile Full featured support Create, Query, Transactions… Databinding DataGrid

Smartphone now supports SQL Mobile

Full featured support

Create, Query, Transactions…

Databinding

DataGrid

Direct Data Management

Direct Data Management SqlCeResultset Updatable scrolling SQL Mobile cursor Dataset Improved parity with full .NET Framework Easier to synchronize changes to/from full .NET Framework XML XML Serialization XPath Support XML Schema

SqlCeResultset

Updatable scrolling SQL Mobile cursor

Dataset

Improved parity with full .NET Framework

Easier to synchronize changes to/from full .NET Framework

XML

XML Serialization

XPath Support

XML Schema

SqlCeResultSet SqlCeResultSet Provides direct connectivity to the SQL Server Mobile Edition database Supports forward and backward scrolling Supports updates Supports databinding

SqlCeResultSet

Provides direct connectivity to the SQL Server Mobile Edition database

Supports forward and backward scrolling

Supports updates

Supports databinding

SqlCeResultSet Features vs. Performance Features comparable to DataSet commonly used features Scrolling Updatability Databinding Performance similar to SqlCeDataReader Direct db access No in-memory data duplication

Features comparable to DataSet commonly used features

Scrolling

Updatability

Databinding

Performance similar to SqlCeDataReader

Direct db access

No in-memory data duplication

SqlCeResultSet Compatability with SqlCeDataReader Inherits from SqlCeDataReader Provides strongly typed getters GetInt32(), GetString(), etc. Provides SqlCeDataReader forward Read() method Fully compatible with existing SqlCeDataReader code you may have

Inherits from SqlCeDataReader

Provides strongly typed getters

GetInt32(), GetString(), etc.

Provides SqlCeDataReader forward Read() method

Fully compatible with existing SqlCeDataReader code you may have

SqlCeResultSet Usage Created from SqlCeCommand ExecuteResultSet method Specific behavior controlled by ResultSetOptions enumeration

Created from SqlCeCommand ExecuteResultSet method

Specific behavior controlled by ResultSetOptions enumeration

SqlCeResultSet Usage (continued) string sql = "Select ProductId, Desc, Qty, UnitPrice"; SqlCeConnection conn = new SqlCeConnection(@"Data Source = Orders.sdf"); SqlCeCommand commmand = new SqlCeCommand(sql, conn); SqlCeResultSet rs = commmand.ExecuteResultSet(ResultSetOptions.None); while (rs.Read()) { // retrieve column values from the current record }

SqlCeResultSet Updatability Full Support for updatability Use ResultSetOptions.Updatable when executing the command Use strongly typed Setters to modify columns SetInt32, SetString Call Update method to save record changes to the database

Full Support for updatability

Use ResultSetOptions.Updatable when executing the command

Use strongly typed Setters to modify columns

SetInt32, SetString

Call Update method to save record changes to the database

SqlCeResultSet Updatability(continued) SqlCeResultSet rs = commmand.ExecuteResultSet(ResultSetOptions.Updatable); int idxProductId = rs.GetOrdinal("ProductId"); int idxDesc = rs.GetOrdinal("Desc"); int idxUnitPrice = rs.GetOrdinal("UnitPrice"); while (rs.Read()) { // Retrieve current values string productId = rs.GetString(idxProductId); string desc = rs.GetString(idxDesc); double unitPrice = rs.GetDouble(idxUnitPrice); // Prepend Product ID to the description rs.SetString(idxDesc, productId + " - " + desc); // Increase the price by 10% rs.SetDouble(idxUnitPrice, unitPrice * 1.1); // Apply record changes to db rs.Update(); }

SqlCeResultSet Scrolling Access Supports scrolling and direct record access Use ResultSetOptions.Scrollable when executing the command Provides Readxxx commands ReadFirsts, ReadLast Read, ReadPrevious ReadAbsolute ReadRelative

Supports scrolling and direct record access

Use ResultSetOptions.Scrollable when executing the command

Provides Readxxx commands

ReadFirsts, ReadLast

Read, ReadPrevious

ReadAbsolute

ReadRelative

SqlCeResultSet Scrolling Access (continued) SqlCeResultSet rs = commmand.ExecuteResultSet(ResultSetOptions.Scrollable | ResultSetOptions.Updatable ); // Read entire result backwards rs.ReadLast(); while(rs.ReadPrevious(); { // ... } // Absolute positioning rs.ReadAbsolute(10); // Read 10 records from beginning rs.ReadAbsolute(-10); // Read 10 records from end // Relative positioning rs.ReadRelative(5); // Read forward 5 records rs.ReadRelative(-5); // Read backward 5 records

SqlCeResultSet Databinding Create result set as normal All ResultSetOptions allowable Should include ResultSetOptions.Scrollable Bind to the ResultSetView property of the result set Provides same interfaces as DataView ITypedList, IBindingList, IList, ICollection, IEnumerable, IDisposable Can be used with any bindable controls

Create result set as normal

All ResultSetOptions allowable

Should include ResultSetOptions.Scrollable

Bind to the ResultSetView property of the result set

Provides same interfaces as DataView

ITypedList, IBindingList, IList, ICollection, IEnumerable, IDisposable

Can be used with any bindable controls

SqlCeResultSet Databinding (continued) SqlCeResultSet rs = commmand.ExecuteResultSet(ResultSetOptions.Scrollable); listBox1.DataSource = rs.ResultSetView; listBox1.DisplayMember = "Desc"; listBox1.ValueMember = "ProductId"; textBox1.DataBindings.Add("Text", rs, "UnitPrice");

DataSet Several new methods added New methods improve parity with desktop New methods make synchronizing changes much easier

Several new methods added

New methods improve parity with desktop

New methods make synchronizing changes much easier

DataSet New Features/Methods Serialization methods now supported on a single table DataSet.Copy method DataSet.GetChanges method DataSet.Merge

Serialization methods now supported on a single table

DataSet.Copy method

DataSet.GetChanges method

DataSet.Merge

DataSet DataTable Serialization An individual data table can now be saved and restored WriteXml ReadXml An individual data table can now be sent or received as a web service argument Simply pass as an argument

An individual data table can now be saved and restored

WriteXml

ReadXml

An individual data table can now be sent or received as a web service argument

Simply pass as an argument

DataSet DataTable Serialization private void DeptComplete(string deptName, DataSet ds) { DataTable dt = ds.Tables["DeptDetail"]; dt.WriteXml(deptName + ".xml"); dt.Clear(); } private void DeptRestore(string deptName, DataSet ds) { DataTable dt = ds.Tables["DeptDetail"]; dt.Clear(); dt.ReadXml(deptName + ".xml"); }

DataSet Copy Method Copy creates an exact duplicate Copy includes both data and schema Useful for transferring a snapshot Snapshot can be sent in background Application can still continue to function and modify original DataSet

Copy creates an exact duplicate

Copy includes both data and schema

Useful for transferring a snapshot

Snapshot can be sent in background

Application can still continue to function and modify original DataSet

DataSet Copy Method (continued) [WebMethod] public void SaveSnapshot(DataSet ds) { WriteDataSetToDatabase(ds); } private void Upload(DataSet ds) { DataServerProxy wsProxy = new DataServerProxy(); wsProxy.SaveSnapshot(ds); } Target Web Service Device call – Too slow, user must wait for whole upload

DataSet Copy Method (continued) private void Upload(DataSet ds) { DataServerProxy wsProxy = new DataServerProxy(); wsProxy.BeginSaveSnapshot(ds, null, null); } private void Upload(DataSet ds) { DataServerProxy wsProxy = new DataServerProxy(); DataSet dsDupe = ds.Copy(); wsProxy.BeginSaveSnapshot(dsDupe, null, null); } Device call – Changes to data during upload will corrupt upload Device call – Send copy in background, this is safe

DataSet Getting changes GetChanges method Retrieves changes since DataSet was loaded or AcceptChanges was called Changes returned as a DataSet The returned DataSet will generally be much smaller then original DataSet Returned DataSet is optimized for merging

GetChanges method

Retrieves changes since DataSet was loaded or AcceptChanges was called

Changes returned as a DataSet

The returned DataSet will generally be much smaller then original DataSet

Returned DataSet is optimized for merging

DataSet Merging Changes Merge method Merges a DataSet into the current DataSet Data is matched up based on primary key Additions, deletions, modifications in the source DataSet are applied to the target

Merge method

Merges a DataSet into the current DataSet

Data is matched up based on primary key

Additions, deletions, modifications in the source DataSet are applied to the target

DataSet Retrieving Changes from server [WebMethod] public DataSet GetLatest(DateTime startingDate) { return RetrieveChangesFromDatabase(startingDate); } private void GetUpdates(DataSet currentDs, DateTime lastUpdate) { DataServerProxy wsProxy = new DataServerProxy(); DataSet changeDs = wsProxy.GetLatest(lastUpdate); currentDs.Merge(changeDs); } Web method on server Call to web method from device

DataSet Sending Changes to the server [WebMethod] public void StoreUpdates(DataSet changeDs) { ApplyChangesToDataBase(changeDs); } private void SendChanges(DataSet currentDs) { DataServerProxy wsProxy = new DataServerProxy(); DataSet changeDs = currentDs.GetChanges(); wsProxy.StoreUpdates(changeDs); } Web method on server Call to web method from device

XML Support Added more XML features Greater parity with the full framework XML Serialization XPath XML Schema

Added more XML features

Greater parity with the full framework

XML Serialization

XPath

XML Schema

XML Serializer Classes can now be serialize/deserialized XmlSerializer class is the engine Serialize saves class instance as XML Deserialize restores the class instance Serialization Control Class must have default constructor Attributes can control details XmlElement XmlAttribute

Classes can now be serialize/deserialized

XmlSerializer class is the engine

Serialize saves class instance as XML

Deserialize restores the class instance

Serialization Control

Class must have default constructor

Attributes can control details

XmlElement

XmlAttribute

XPath XPath now supported by XmlDocument Rich support for XPath queries Notably simplifies XML processing Methods SelectNode Returns a single matching node SelectNodes Returns list of matching nodes

XPath now supported by XmlDocument

Rich support for XPath queries

Notably simplifies XML processing

Methods

SelectNode

Returns a single matching node

SelectNodes

Returns list of matching nodes

XmlSchema XmlSchema provides XML validation engine Eliminates the need to validate explicitly in code Useful for verifying that a document appears as expected Useful for verifying content to legacy web services Can programmatically construct schemas

XmlSchema provides XML validation engine

Eliminates the need to validate explicitly in code

Useful for verifying that a document appears as expected

Useful for verifying content to legacy web services

Can programmatically construct schemas

Connectivity and Data Transfer

Connectivity and Data Transfer Detecting changes in connectivity Your application can now respond to changes in connectivity!! Your application can the know type of connectivity (GPRS, Modem, ActiveSync…) MSMQ Reliable message delivery Automatically handles connectivity

Detecting changes in connectivity

Your application can now respond to changes in connectivity!!

Your application can the know type of connectivity (GPRS, Modem, ActiveSync…)

MSMQ

Reliable message delivery

Automatically handles connectivity

Connectivity Detecting changes in connectivity Device connectivity is inconsistent Connectivity comes and goes Type of connectivity may vary during application lifetime GPRS Modem ActiveSync WiFi Applications must behave gracefully in the face of these changes

Device connectivity is inconsistent

Connectivity comes and goes

Type of connectivity may vary during application lifetime

GPRS

Modem

ActiveSync

WiFi

Applications must behave gracefully in the face of these changes

Tools and Productivity Enhancements

Tools and Productivity Enhancements Visual Studio for Devices Manage device databases from your desktop!! Copy SQL Mobile databases between your desktop and device Generating typed Datasets

Visual Studio for Devices

Manage device databases from your desktop!!

Copy SQL Mobile databases between your desktop and device

Generating typed Datasets

Create and Manage Can now administer database from the desktop Create new database Add tables Define columns and indexes

Can now administer database from the desktop

Create new database

Add tables

Define columns and indexes

Create New Database

Creating New Table

Automatically adds to device

Typed DataSets .NET CF now supports typed DataSets Provides strongly typed table structure Strongly typed properties of the column getters

.NET CF now supports typed DataSets

Provides strongly typed table structure

Strongly typed properties of the column getters

Summary Great enhancement to SQL Mobile SqlCeResultSet provides updatable, scrollable cursor DataSet provides new methods to make sync easier Rich XML support Can easily detect connectivity Tools make device DB development as easy as server-based DB’s

Great enhancement to SQL Mobile

SqlCeResultSet provides updatable, scrollable cursor

DataSet provides new methods to make sync easier

Rich XML support

Can easily detect connectivity

Tools make device DB development as easy as server-based DB’s

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