ADO.NET 2.0

ADO.NET 2.0ADO.NET 2.0

CaptatorTlf: 8620 4242www.captator.dk

Henrik Lykke NielsenSoftwarearkitekt, Microsoft Regional Director for [email protected]: 2237 3311

AgendaAgenda

ProvidermodellenProvidermodellen Basis klasser og interfacesBasis klasser og interfaces Provider factories, ConnectionstrengeProvider factories, Connectionstrenge

Schema APISchema API DataSet, DataTable, DataViewDataSet, DataTable, DataView

Indexeringsmekanisme, serialiseringIndexeringsmekanisme, serialisering SqlBulkCopySqlBulkCopy

Asynkrone kaldAsynkrone kald DataBindingDataBinding

XML Parser

<xml>…

</xml>

Web/Win Form ControlsVS.NET

Designers

.NET Data Provider

DataAdapter DataReader

CommandConnection

… SQLOLEDB

VS.NET Class Generator

DataSetItemCust

Order

Kode

ADO.NET arkitekturenADO.NET arkitekturen

OleDbOleDb

OleDbConnectionOleDbConnection IDbConnectionIDbConnection

OleDbCommandOleDbCommand IDbCommandIDbCommand

OleDbDataAdapterOleDbDataAdapter DbDataAdapterDbDataAdapter

DataAdapterDataAdapter IDataAdapterIDataAdapter

IDbDataAdapterIDbDataAdapter IDataAdapterIDataAdapter

OleDbDataReaderOleDbDataReader IDataReaderIDataReader

IDataRecordIDataRecord

SqlClientSqlClient

SqlConnectionSqlConnection IDbConnectionIDbConnection

SqlCommandSqlCommand IDbCommandIDbCommand

SqlDataAdapterSqlDataAdapter DbDataAdapterDbDataAdapter



SqlDataReaderSqlDataReader IDataReaderIDataReader


Basis klasser og interfaces i Basis klasser og interfaces i 1.11.1 Bemærk: Læses som at SqlDataAdapter arver fra DbDataAdapterBemærk: Læses som at SqlDataAdapter arver fra DbDataAdapter

OleDbOleDb

OleDbConnectionOleDbConnection DbConnectionDbConnection

IDbConnectionIDbConnection

OleDbCommandOleDbCommand DbCommandDbCommand

IDbCommandIDbCommand

OleDbDataAdapterOleDbDataAdapter DbDataAdapterDbDataAdapter



OleDbDataReaderOleDbDataReader DbDataReaderDbDataReader

IDataReaderIDataReader IDataRecordIDataRecord

SqlClientSqlClient

SqlConnectionSqlConnection DbConnectionDbConnection

IDbConnectionIDbConnection ISqlConnectionISqlConnection

IDbConnectionIDbConnection SqlCommandSqlCommand

DbCommandDbCommand IDbCommandIDbCommand

ISqlCommandISqlCommand IDbCommandIDbCommand

SqlDataAdapterSqlDataAdapter DbDataAdapterDbDataAdapter



SqlDataReaderSqlDataReader DbDataReaderDbDataReader

IDataReaderIDataReader IDataRecordIDataRecord

ISqlReaderISqlReader ISqlRecordISqlRecord


Basis klasser og interfaces i Basis klasser og interfaces i 2.02.0

DbDataAdapter implementerer nu IDbDataAdapterDbDataAdapter implementerer nu IDbDataAdapter

Interfaces og basis klasse i Interfaces og basis klasse i 1.11.1

SqlClient klasseSqlClient klasse OleDb klasseOleDb klasse Basisklasse/interfaceBasisklasse/interface

SqlConnection OleDbConnection IDbConnection

SqlCommand OleDbCommand IDbCommand

SqlDataReader OleDbDataReader IDataReader IDataRecord

SqlTransaction OleDbTransaction IDbTransaction

SqlParameter OleDbParameter IDbDataParameter IDataParameter

SqlParameterCollection OleDbParameterCollection IDataParameterCollection IList

SqlDataAdapter OleDbDataAdapter DbDataAdapter DataAdapter IDbDataAdapter IDataAdapter

SqlCommandBuilder OleDbCommandBuilder

SqlException SystemException

OleDbException ExternalException SystemException

Interfaces og basis klasser i Interfaces og basis klasser i 2.02.0

De abstrakte basis klasser befinder De abstrakte basis klasser befinder sig i sig i System.Data.Common System.Data.Common namespacetnamespacet

SqlClient klasseSqlClient klasse Abstrakt basis klasseAbstrakt basis klasse InterfaceInterface

SqlConnection DbConnection IDbConnection

SqlCommand DbCommand IDbCommand

SqlDataReader DbDataReader IDataReader IDataRecord

SqlTransaction DbTransaction IDbTransaction

SqlParameter DbParameter IDbDataParameter IDataParameter

SqlParameterCollection DbParameterCollection IDataParameterCollection IList

SqlDataAdapter DbDataAdapter IDbDataAdapter IDataAdapter

SqlCommandBuilder DbCommandBuilder

SqlException DbException

SqlConnectionStringBuilder DbConnectionStringBuilder

Provider factoriesProvider factories

System.Data.Common.DbProviderFactorySystem.Data.Common.DbProviderFactory En abstrakt klasse der er basisklasse for de konkrete En abstrakt klasse der er basisklasse for de konkrete

factories: SqlClientFactory, OleDbFactory, ...factories: SqlClientFactory, OleDbFactory, ... Metoder:Metoder:

CreateConnection As DbConnectionCreateConnection As DbConnection CreateCommand As DbCommandCreateCommand As DbCommand CreateCommandBuilder, CreateCommandBuilder,

CreateConnectionStringBuilder, CreateDataAdapter, CreateConnectionStringBuilder, CreateDataAdapter, CreateParameter, CreatePermission, CreateParameter, CreatePermission, CreateDataSourceEnumerator, CreateDataSourceEnumerator, CanCreateDataSourceEnumeratorCanCreateDataSourceEnumerator

De konkrete factories har ingen konstruktører, men i De konkrete factories har ingen konstruktører, men i stedet en Instance-metodestedet en Instance-metode

Public ReadOnly Shared Instance As SqlClientFactoryPublic ReadOnly Shared Instance As SqlClientFactory

public readonly static SqlClientFactory Instancepublic readonly static SqlClientFactory Instance

VB

C#


System.Data.Common.DbProviderFactoriesSystem.Data.Common.DbProviderFactories Util klasseUtil klasse Metoder:Metoder:

Public Shared Function GetFactory(ByVal providerInvariantName As String) _ As System.Data.Common.DbProviderFactory

Public Shared Function GetFactory(ByVal providerRow As System.Data.DataRow) _ As System.Data.Common.DbProviderFactory

Public Shared Function GetFactoryClasses() As System.Data.DataTable

Public Shared Function GetFactory(ByVal providerInvariantName As String) _ As System.Data.Common.DbProviderFactory

Public Shared Function GetFactory(ByVal providerRow As System.Data.DataRow) _ As System.Data.Common.DbProviderFactory

Public Shared Function GetFactoryClasses() As System.Data.DataTable

public static System.Data.Common.DbProviderFactory GetFactory( string providerInvariantName)

public static System.Data.Common.DbProviderFactory GetFactory( System.Data.DataRow providerRow)

public static System.Data.DataTable GetFactoryClasses()

public static System.Data.Common.DbProviderFactory GetFactory( string providerInvariantName)

public static System.Data.Common.DbProviderFactory GetFactory( System.Data.DataRow providerRow)

public static System.Data.DataTable GetFactoryClasses()

VB

C#


DbProviderFactories er registreret i DbProviderFactories er registreret i machine.configmachine.config

GetFactoryClassesGetFactoryClasses

giver en DataTablegiver en DataTable

med ovenståendemed ovenstående

infoinfo

<system.data> <DbProviderFactories> <add name="Odbc Data Provider" invariant="System.Data.Odbc" support="BF" description=".Net Framework Data Provider for Odbc" type="System.Data.Odbc.OdbcFactory, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <add name="OleDb Data Provider" ... /> <add name="OracleClient Data Provider" ... /> <add name="SqlClient Data Provider" ... /> <add name="SQL Server CE Data Provider" ... /> </DbProviderFactories></system.data>

<system.data> <DbProviderFactories> <add name="Odbc Data Provider" invariant="System.Data.Odbc" support="BF" description=".Net Framework Data Provider for Odbc" type="System.Data.Odbc.OdbcFactory, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <add name="OleDb Data Provider" ... /> <add name="OracleClient Data Provider" ... /> <add name="SqlClient Data Provider" ... /> <add name="SQL Server CE Data Provider" ... /> </DbProviderFactories></system.data>

Attibut-navnAttibut-navn Column-navnColumn-navnname Name

invariant InvariantName

support SupportedClasses

description Description

type AssemblyQualifiedName

ConnectionStrengeConnectionStrenge

System.Data.Common.DbConnectionStringBuilSystem.Data.Common.DbConnectionStringBuilderderer et svagt-typet dictionaryer et svagt-typet dictionary

Dim factory As System.Data.Common.DbProviderFactoryfactory = DbProviderFactories.GetFactory("System.Data.SqlClient")

Dim connBuilder As System.Data.Common.DbConnectionStringBuilderconnBuilder = factory.CreateConnectionStringBuilder()

connBuilder.Add("Data Source", "localhost")connBuilder.Add("User Id", "DemoUser")connBuilder.Add("Password", "hemmeligt")


Dim connBuilder As System.Data.Common.DbConnectionStringBuilderconnBuilder = factory.CreateConnectionStringBuilder()

connBuilder.Add("Data Source", "localhost")connBuilder.Add("User Id", "DemoUser")connBuilder.Add("Password", "hemmeligt")

System.Data.Common.DbProviderFactory factory;factory = DbProviderFactories.GetFactory("System.Data.SqlClient");

System.Data.Common.DbConnectionStringBuilder connBuilder;connBuilder = factory.CreateConnectionStringBuilder();

connBuilder.Add("Data Source", "localhost");connBuilder.Add("User Id", "DemoUser");connBuilder.Add("Password", "hemmeligt");


System.Data.Common.DbConnectionStringBuilder connBuilder;connBuilder = factory.CreateConnectionStringBuilder();

connBuilder.Add("Data Source", "localhost");connBuilder.Add("User Id", "DemoUser");connBuilder.Add("Password", "hemmeligt");

VB

C#

ConnectionStrengeConnectionStrenge

Nedarves af (mere eller mindre) typestærke Nedarves af (mere eller mindre) typestærke klasserklasser OdbcConnectionStringBuilderOdbcConnectionStringBuilder

Driver, DsnDriver, Dsn

OleDbConnectionStringBuilderOleDbConnectionStringBuilder DataSource, FileName, Provider, ...DataSource, FileName, Provider, ...

OracleClientConnectionStringBuilderOracleClientConnectionStringBuilder DataSource, IntegratedSecurity, DataSource, IntegratedSecurity,

LoadBalanceTimeout, MaxPoolSize, MinPoolSize, LoadBalanceTimeout, MaxPoolSize, MinPoolSize, Password, PersistSecurityInfo, Pooling, Unicode, Password, PersistSecurityInfo, Pooling, Unicode, UserID, ...UserID, ...

SqlConnectionStringBuilderSqlConnectionStringBuilder ApplicationName, AsynchronousProcessing, ApplicationName, AsynchronousProcessing,

ConnectTimeout, DataSource, Encrypt, ConnectTimeout, DataSource, Encrypt, FailOverPartner, InitialCatalog, IntegratedSecurity, FailOverPartner, InitialCatalog, IntegratedSecurity, LoadBalanceTimeout, MaxPoolSize, MinPoolSize, LoadBalanceTimeout, MaxPoolSize, MinPoolSize, MultipleActiveResultSets, NetworkLibrary, Password, MultipleActiveResultSets, NetworkLibrary, Password, PersistSecurityInfo, Pooling, Replication, UserID, ...PersistSecurityInfo, Pooling, Replication, UserID, ...

Enumerering af data sourcesEnumerering af data sources

GetDataSources på en GetDataSources på en DbDataSourceEnumerator finder DbDataSourceEnumerator finder datasources (MS SQL) på nettetdatasources (MS SQL) på nettet

System.Data.Sql.SqlDataSourceEnumeratSystem.Data.Sql.SqlDataSourceEnumerator er den eneste konkrete or er den eneste konkrete implementationimplementation


Dim enumerator As System.Data.Common.DbDataSourceEnumeratorenumerator = factory.CreateDataSourceEnumerator()

Dim dataSourceTable As System.Data.DataTable = enumerator.GetDataSources()


Dim enumerator As System.Data.Common.DbDataSourceEnumeratorenumerator = factory.CreateDataSourceEnumerator()

Dim dataSourceTable As System.Data.DataTable = enumerator.GetDataSources()


System.Data.Common.DbDataSourceEnumerator enumerator;enumerator = factory.CreateDataSourceEnumerator();

System.Data.DataTable dataSourceTable = enumerator.GetDataSources();


System.Data.Common.DbDataSourceEnumerator enumerator;enumerator = factory.CreateDataSourceEnumerator();

System.Data.DataTable dataSourceTable = enumerator.GetDataSources();

VB

C#

Fælles Fælles programmeringsmodelprogrammeringsmodel Lettere for Microsoft (og andre) at udvide Lettere for Microsoft (og andre) at udvide

providereprovidere Mere ensartet programmeringsmodelMere ensartet programmeringsmodel Provider factories løser instansieringsproblemetProvider factories løser instansieringsproblemet

Gem providerens InvariantName i f.eks. Gem providerens InvariantName i f.eks. konfiguationsfilkonfiguationsfil

GetFactory der returnerer den enkelte GetFactory der returnerer den enkelte provider factory instans bruger reflektion – så provider factory instans bruger reflektion – så genbrug den!genbrug den!

Brug af basisklasser giver ikke performance Brug af basisklasser giver ikke performance overheadoverhead

GetFactoryClasses() god til udvikler/admin toolsGetFactoryClasses() god til udvikler/admin tools ConnectionStringBuilders gør det lettere at lave ConnectionStringBuilders gør det lettere at lave

connectionstrenge – men de enkelte er connectionstrenge – men de enkelte er (desværre) ret forskellige(desværre) ret forskellige

Schema APIetSchema APIet

API til at få schema-oplysninger om API til at få schema-oplysninger om en DataSourceen DataSource

DbConnections GetSchema-metode i DbConnections GetSchema-metode i tre formertre former

Public Function conn.GetSchema() As DataTable

Public Function conn.GetSchema(collectionName As String) As DataTable

Public Function conn.GetSchema(collectionName As String, _ restrictionValues As String()) As DataTable

Public Function conn.GetSchema() As DataTable

Public Function conn.GetSchema(collectionName As String) As DataTable

Public Function conn.GetSchema(collectionName As String, _ restrictionValues As String()) As DataTable

VB

public DataTable conn.GetSchema()

public DataTable conn.GetSchema(string collectionName)

public DataTable conn.GetSchema(string collectionName, string[] restrictionValues)

public DataTable conn.GetSchema()

public DataTable conn.GetSchema(string collectionName)

public DataTable conn.GetSchema(string collectionName, string[] restrictionValues)

C#

Schema - Schema - MetaDataCollectionsMetaDataCollections Få en liste over metadatacollectionsFå en liste over metadatacollections

Metadata collections:Metadata collections: MetaDataCollections, MetaDataCollections,

DataSourceInformation, DataTypes, DataSourceInformation, DataTypes, Restrictions, Users, Databases, Tables, Restrictions, Users, Databases, Tables, Columns, Views, ViewColumns, Columns, Views, ViewColumns, ProcedureParameters, Procedures, ProcedureParameters, Procedures, ForeignKeys, IndexColumns, Indexes, ForeignKeys, IndexColumns, Indexes, UserDefinesTypesUserDefinesTypes

Dim tbl As DataTable = conn.GetSchema()' ellertbl = conn.GetSchema("MetaDataCollections")

Dim tbl As DataTable = conn.GetSchema()' ellertbl = conn.GetSchema("MetaDataCollections")

DataTable tbl = conn.GetSchema();// ellerDataTable tbl = conn.GetSchema("MetaDataCollections");

DataTable tbl = conn.GetSchema();// ellerDataTable tbl = conn.GetSchema("MetaDataCollections");

VB

C#

Schema - Schema - DataSourceInformationDataSourceInformation Få informationer om datasourcenFå informationer om datasourcen

Indeholder én rowIndeholder én row Muligvis forskellige felter – ens for Muligvis forskellige felter – ens for

MS’s providereMS’s providere DataSourceProductName, DataSourceProductName,

DataSourceProductVersion, IdentifierPattern, DataSourceProductVersion, IdentifierPattern, ParameterMarkerFormat, ParameterMarkerPattern, ParameterMarkerFormat, ParameterMarkerPattern, ParameterNameMaxLength, ParameterNameMaxLength, ParameterNamePattern, QuotedIdentifierPattern, ParameterNamePattern, QuotedIdentifierPattern, StatementSeparatorPattern, StringLiteralPattern, StatementSeparatorPattern, StringLiteralPattern, SupportedJoinOperators, ...SupportedJoinOperators, ...

Dim tbl As DataTable = conn.GetSchema("DataSourceInformation")Dim tbl As DataTable = conn.GetSchema("DataSourceInformation")

DataTable tbl = conn.GetSchema("DataSourceInformation");DataTable tbl = conn.GetSchema("DataSourceInformation");

VB

C#

Schema - restriktionerSchema - restriktioner

Restriktioner er simple filtre for, hvilke entiteter Restriktioner er simple filtre for, hvilke entiteter man ønsker metadata forman ønsker metadata for

Restriktioner angives via værdier i et streng arrayRestriktioner angives via værdier i et streng array Restriktioner er defineret i ”Restrictions”-Restriktioner er defineret i ”Restrictions”-

collectionencollectionen Eksempel på brug af restrictionerEksempel på brug af restrictioner

Konkrete informationer varierer mellem providereKonkrete informationer varierer mellem providere

Dim res As String(3)res(1) = "Person"res(2) = "Contact"Dim tbl As System.Data.DataTable = conn.GetSchema("Columns", res)

Dim res As String(3)res(1) = "Person"res(2) = "Contact"Dim tbl As System.Data.DataTable = conn.GetSchema("Columns", res)

VB

string[] res = new string[4];res[1] = "Person"; res[2] = "Contact";System.Data.DataTable tbl = conn.GetSchema("Columns", res);

string[] res = new string[4];res[1] = "Person"; res[2] = "Contact";System.Data.DataTable tbl = conn.GetSchema("Columns", res);

C#

DataSet, DataTable - DataSet, DataTable - performanceperformance Ny indexeringsmekanisme giver markant Ny indexeringsmekanisme giver markant

forbedret performance ved for eksempel Fill forbedret performance ved for eksempel Fill og Mergeog Merge

public System.Data.DataTable CreateDataTable(int numberOfRows){ System.Random rnd = new System.Random();

System.Data.DataTable tbl = new System.Data.DataTable();

tbl.Columns.Add("Id", typeof(System.Guid)); tbl.Columns["Id"].Unique = true; tbl.Columns.Add("RandomValue", typeof(int));

for (int n = 0; n < numberOfRows; n++) { System.Data.DataRow row = tbl.NewRow(); row["Id"] = System.Guid.NewGuid(); row["RandomValue"] = rnd.Next(); tbl.Rows.Add(row); }

return tbl;}

public System.Data.DataTable CreateDataTable(int numberOfRows){ System.Random rnd = new System.Random();

System.Data.DataTable tbl = new System.Data.DataTable();

tbl.Columns.Add("Id", typeof(System.Guid)); tbl.Columns["Id"].Unique = true; tbl.Columns.Add("RandomValue", typeof(int));

for (int n = 0; n < numberOfRows; n++) { System.Data.DataRow row = tbl.NewRow(); row["Id"] = System.Guid.NewGuid(); row["RandomValue"] = rnd.Next(); tbl.Rows.Add(row); }

return tbl;}

C#

DataSet, DataTable - DataSet, DataTable - performanceperformance ResultaterResultater

0

200

400

600

800

1000

1200

1400

1600

100000 200000 500000 1000000

Antal rows

An

tal s

eku

nd

er

VS2003 - not unique VS2005 - not unique VS2003 - unique VS2005 - unique

Antal rows Antal rows VS2003VS2003ikke uniqueikke unique

VS2005VS2005ikke uniqueikke unique

VS2003VS2003uniqueunique

VS2005VS2005uniqueunique

100.000 1 sek 1 sek 6 sek 3 sek

200.000 1 sek 2 sek 33 sek 6 sek

500.000 3 sek 5 sek 322 sek 17 sek

1.000.000 6 sek 11 sek 1414 sek 38 sek

Dataset, DataTable - Dataset, DataTable - serialiseringserialisering DataSets og DataTables serialiserer sig DataSets og DataTables serialiserer sig

selv som XML uanset man bruger en selv som XML uanset man bruger en BinaryFormatterBinaryFormatter

Kan nu fortælle, at der skal serialiseres Kan nu fortælle, at der skal serialiseres binærtbinært

RemotingFormat-propertyen kan sættes tilRemotingFormat-propertyen kan sættes til System.Data.SerializationFormat.Xml System.Data.SerializationFormat.Xml

(default)(default) System.Data.SerializationFormat.BinarySystem.Data.SerializationFormat.Binary

Dataset, DataTable - Dataset, DataTable - serialiseringserialisering

Eksempel med 100.000 simple rows skrevet Eksempel med 100.000 simple rows skrevet til filtil fil XML-format: 16.813 KB – 19.851 KBXML-format: 16.813 KB – 19.851 KB Binært format: 835 KB – 3.374 KBBinært format: 835 KB – 3.374 KB

tbl.RemotingFormat = System.Data.SerializationFormat.Binary

Dim formatter As New BinaryFormatter()Dim st As New FileStream(fileName, FileMode.Create)formatter.Serialize(st, tbl)st.Close()

tbl.RemotingFormat = System.Data.SerializationFormat.Binary

Dim formatter As New BinaryFormatter()Dim st As New FileStream(fileName, FileMode.Create)formatter.Serialize(st, tbl)st.Close()

VB

tbl.RemotingFormat = System.Data.SerializationFormat.Binary;

BinaryFormatter formatter = new BinaryFormatter();FileStream st = new FileStream(fileName, FileMode.Create);formatter.Serialize(st, tbl);st.Close();

tbl.RemotingFormat = System.Data.SerializationFormat.Binary;

BinaryFormatter formatter = new BinaryFormatter();FileStream st = new FileStream(fileName, FileMode.Create);formatter.Serialize(st, tbl);st.Close();

C#

DataTable - XMLDataTable - XML

XML understøttelse som for DataSets:XML understøttelse som for DataSets:ReadXml, ReadXmlSchemaReadXml, ReadXmlSchemaWriteXml, WriteXmlSchemaWriteXml, WriteXmlSchema

DataSet, DataTable, DataSet, DataTable, DataReaderDataReader Populér DataTable/DataSet ud fra Populér DataTable/DataSet ud fra

DataReaderDataReader

Generer DataReader ud fra Generer DataReader ud fra DataTable/DataSetDataTable/DataSet

Hvis CreateDataReader kaldes på et DataSet med Hvis CreateDataReader kaldes på et DataSet med flere tabeller vil DataReaderen indeholde multiple flere tabeller vil DataReaderen indeholde multiple resultsetresultset

' Tag fat i en database …Dim dr As System.Data.SqlClient.SqlDataReader = cmd.ExecuteReader()Dim tbl As New System.Data.DataTable()tbl.Load(dr)

' Tag fat i en database …Dim dr As System.Data.SqlClient.SqlDataReader = cmd.ExecuteReader()Dim tbl As New System.Data.DataTable()tbl.Load(dr)

VB

// Tag fat i en database …System.Data.SqlClient.SqlDataReader dr = cmd.ExecuteReader();System.Data.DataTable tbl = new System.Data.DataTable();tbl.Load(dr);

// Tag fat i en database …System.Data.SqlClient.SqlDataReader dr = cmd.ExecuteReader();System.Data.DataTable tbl = new System.Data.DataTable();tbl.Load(dr);

C#

Dim tbl As System.Data.DataTable = LavEnDataTable()Dim dr As System.Data.DataTableReader = tbl.CreateDataReader()

Dim tbl As System.Data.DataTable = LavEnDataTable()Dim dr As System.Data.DataTableReader = tbl.CreateDataReader()

VB

System.Data.DataTable tbl = LavEnDataTable();System.Data.DataTableReader dr = tbl.CreateDataReader();

System.Data.DataTable tbl = LavEnDataTable();System.Data.DataTableReader dr = tbl.CreateDataReader(); C#

DataTable, DataViewDataTable, DataView

Generer en DataTable ud fra et Generer en DataTable ud fra et DataViewDataView

Dim tbl As System.Data.DataTable = LavEnDataTable()

Dim view As New System.Data.DataView(tbl)view.Sort = "FirstName ASC, LastName DESC"view.RowFilter = "FirstName>'C'"

Dim columnNames As String() = { "FirstName", "LastName" }

Dim tblFiltered As System.Data.DataTabletblFiltered = view.ToTable("MinFiltreredeTabel", False, columnNames)

Dim tbl As System.Data.DataTable = LavEnDataTable()

Dim view As New System.Data.DataView(tbl)view.Sort = "FirstName ASC, LastName DESC"view.RowFilter = "FirstName>'C'"

Dim columnNames As String() = { "FirstName", "LastName" }

Dim tblFiltered As System.Data.DataTabletblFiltered = view.ToTable("MinFiltreredeTabel", False, columnNames)

VB

System.Data.DataTable tbl = LavEnDataTable();

System.Data.DataView view = new System.Data.DataView(tbl);view.Sort = "FirstName ASC, LastName DESC";view.RowFilter = "FirstName>'C'";

string[] columnNames = { "FirstName", "LastName" };

System.Data.DataTable tblFiltered;tblFiltered = view.ToTable("MinFiltreredeTabel", false, columnNames);

System.Data.DataTable tbl = LavEnDataTable();

System.Data.DataView view = new System.Data.DataView(tbl);view.Sort = "FirstName ASC, LastName DESC";view.RowFilter = "FirstName>'C'";

string[] columnNames = { "FirstName", "LastName" };

System.Data.DataTable tblFiltered;tblFiltered = view.ToTable("MinFiltreredeTabel", false, columnNames);

C#

Connection statistik - Connection statistik - SqlClientSqlClient StatisticsEnabled, RetrieveStatisticsStatisticsEnabled, RetrieveStatistics

conn.StatisticsEnabled = true;

System.Collections.Hashtable statistics = (System.Collections.Hashtable)_conn.RetrieveStatistics();

txtStatistics.Text = "";

foreach (string key in statistics.Keys){ txtStatistics.Text += key.PadRight(20, ' ') + "= " + statistics[key].ToString() + "\r\n";}

conn.StatisticsEnabled = true;

System.Collections.Hashtable statistics = (System.Collections.Hashtable)_conn.RetrieveStatistics();

txtStatistics.Text = "";

foreach (string key in statistics.Keys){ txtStatistics.Text += key.PadRight(20, ' ') + "= " + statistics[key].ToString() + "\r\n";}

NetworkServerTime = 50BytesReceived = 20989728UnpreparedExecs = 12SumResultSets = 12SelectCount = 12PreparedExecs = 0ConnectionTime = 113202ExecutionTime = 3194Prepares = 0

NetworkServerTime = 50BytesReceived = 20989728UnpreparedExecs = 12SumResultSets = 12SelectCount = 12PreparedExecs = 0ConnectionTime = 113202ExecutionTime = 3194Prepares = 0

BuffersSent = 12SelectRows = 239664ServerRoundtrips = 12CursorOpens = 0Transactions = 0BytesSent = 1968BuffersReceived = 2628IduRows = 0IduCount = 0

BuffersSent = 12SelectRows = 239664ServerRoundtrips = 12CursorOpens = 0Transactions = 0BytesSent = 1968BuffersReceived = 2628IduRows = 0IduCount = 0

C#

Multiple Active ResultSets Multiple Active ResultSets (MARS)(MARS) SQL Server 2005 featureSQL Server 2005 feature Man kan nu have flere resultsets åbne på Man kan nu have flere resultsets åbne på

samme tid– flere DataReadere om en samme tid– flere DataReadere om en connection (hver sin command)connection (hver sin command)

SqlClient.SqlConnection conn = new SqlClient.SqlConnection(connString);conn.Open();

SqlClient.SqlCommand cmd1 = new SqlClient.SqlCommand(sql1, conn);SqlClient.SqlDataReader rd1 = cmd1.ExecuteReader();

rd1.Read(); rd1.Read(); rd1.Read(); rd1.Read(); rd1.Read(); rd1.Read();


rd2.Read(); rd1.Read(); rd2.Read();

rd2.Close();rd1.Close();conn.Close();

SqlClient.SqlConnection conn = new SqlClient.SqlConnection(connString);conn.Open();


rd1.Read(); rd1.Read(); rd1.Read(); rd1.Read(); rd1.Read(); rd1.Read();


rd2.Read(); rd1.Read(); rd2.Read();

rd2.Close();rd1.Close();conn.Close();

Op til 9 poolede commands per connectionOp til 9 poolede commands per connection

C#

UpdateBatchSize og UpdateBatchSize og SqlBulkCopySqlBulkCopy DbDataAdapter.UpdateBatchSize property DbDataAdapter.UpdateBatchSize property

påvirker DbDataAdapter.Updatepåvirker DbDataAdapter.Update System.Data.SqlClient.SqlBulkCopy påvirker System.Data.SqlClient.SqlBulkCopy påvirker

performanceperformance

100.000 rows i en DataTable100.000 rows i en DataTable DbDataAdapter.Update tog 70 sekunder DbDataAdapter.Update tog 70 sekunder

(BatchSize=100)(BatchSize=100) SqlBulkCopy.WriteToServer tog 3 sekunderSqlBulkCopy.WriteToServer tog 3 sekunder

System.Data.DataTable tbl = CreateDataTable(100000);

System.Data.SqlClient.SqlBulkCopy bulk = new System.Data.SqlClient.SqlBulkCopy(connString);

bulk.DestinationTableName = "RandomTable";bulk.WriteToServer(tbl);

bulk.Close();

System.Data.DataTable tbl = CreateDataTable(100000);

System.Data.SqlClient.SqlBulkCopy bulk = new System.Data.SqlClient.SqlBulkCopy(connString);

bulk.DestinationTableName = "RandomTable";bulk.WriteToServer(tbl);

bulk.Close();

C#

Asynkrone kaldAsynkrone kald

Asynkrone kommandoer i ADO.NET 1.1 og ADO.NET 2.0Asynkrone kommandoer i ADO.NET 1.1 og ADO.NET 2.0 I 1.1 er det muligt at lave asynkrone kald ved at bruge I 1.1 er det muligt at lave asynkrone kald ved at bruge

ThreadPool eller asynkrone delegates – en baggrundstråd ThreadPool eller asynkrone delegates – en baggrundstråd blokeresblokeres

Asynkrone kommandoer i 2.0 blokerer Asynkrone kommandoer i 2.0 blokerer ingeningen baggrundstrådebaggrundstråde

Brugen af asynkrone kommandoer til ADO.NET (SqlClient)Brugen af asynkrone kommandoer til ADO.NET (SqlClient) I scenarier hvor det er vigtigt I scenarier hvor det er vigtigt ikkeikke at blokere tråde (fx. at blokere tråde (fx.

Web apps)Web apps) Designet som resten af de asynkrone arkitekturer i .NETDesignet som resten af de asynkrone arkitekturer i .NET Xxx => BeginXxx med input-parms og EndXxx med Xxx => BeginXxx med input-parms og EndXxx med

output-parms og retur-værdioutput-parms og retur-værdiSynkron MetodeSynkron Metode Asynkrone MetoderAsynkrone Metoder

BeginXxxBeginXxx EndXxx EndXxx

ExecuteNonQuery ExecuteNonQuery BeginExecuteNonQuery BeginExecuteNonQuery EndExecuteNonQuery EndExecuteNonQuery

ExecuteReader ExecuteReader BeginExecuteReader BeginExecuteReader EndExecuteReader EndExecuteReader

ExecuteXmlReader ExecuteXmlReader BeginExecuteXmlReader BeginExecuteXmlReader EndExecuteXmlReader EndExecuteXmlReader

Asynkrone kaldAsynkrone kald

OpsætningOpsætning ””Asynchronous Processing=true” eller ”async=true” i Asynchronous Processing=true” eller ”async=true” i

ConnectionstringConnectionstring Brug forskellige connections til synkrone og asynkrone Brug forskellige connections til synkrone og asynkrone

connections (af hensyn til performance)connections (af hensyn til performance) Der findes 4 måder at afslutte et asynkront kald på:Der findes 4 måder at afslutte et asynkront kald på:

Callback – angiv metode der skal kaldes når arbejde udførtCallback – angiv metode der skal kaldes når arbejde udført Synkroniseringsobjekt – koordinering af asynkrone kald via Synkroniseringsobjekt – koordinering af asynkrone kald via

WaitHandleWaitHandle Polling – check på IAsyncResults property IsCompletedPolling – check på IAsyncResults property IsCompleted Kald EndXxx som vil blokere indtil det asynkrone kald er Kald EndXxx som vil blokere indtil det asynkrone kald er

færdigtfærdigt Vær opmærksom på:Vær opmærksom på:

Kald EndXxx, når et asynkront kald er færdigt (for at undgå Kald EndXxx, når et asynkront kald er færdigt (for at undgå ressource-leaks)ressource-leaks)

Der kan kastes exceptions ved både BeginXxx og EndXxxDer kan kastes exceptions ved både BeginXxx og EndXxx

DataBindingDataBinding

System.Windows.Forms.BindingSource System.Windows.Forms.BindingSource fungererfungerer som en datakilde for kontrollersom en datakilde for kontroller som en mekanisme for opdatering af som en mekanisme for opdatering af

datadata som et datalager (datasource) i sig selv som et datalager (datasource) i sig selv

Kan bindes til forskellige datasourcesKan bindes til forskellige datasources Simple objekter (benytter properties)Simple objekter (benytter properties) Lister såsom ArrayListLister såsom ArrayList Komplekse datakilder såsom DataTablesKomplekse datakilder såsom DataTables


Sæt BindingSources DataSource-property til Sæt BindingSources DataSource-property til datakildendatakilden

DataSource kan også sættes til en DataSource kan også sættes til en System.TypeSystem.Type Informationen videregives til kontroller Informationen videregives til kontroller

der bindesder bindesDim binding As System.Windows.Forms.BindingSource

binding = New System.Windows.Forms.BindingSource()grdPerson.DataSource = binding

Dim p As Personp = New Person("Mr", "Anders", "And", "[email protected]")binding.Add(p)p = New Person("Ms", "Andersine", "And", "[email protected]")binding.Add(p)p = New Person("Mr", "Mikkel", "Mus", "[email protected]")binding.Add(p)

Dim binding As System.Windows.Forms.BindingSource

binding = New System.Windows.Forms.BindingSource()grdPerson.DataSource = binding

Dim p As Personp = New Person("Mr", "Anders", "And", "[email protected]")binding.Add(p)p = New Person("Ms", "Andersine", "And", "[email protected]")binding.Add(p)p = New Person("Mr", "Mikkel", "Mus", "[email protected]")binding.Add(p)

VB


Events såsom:Events såsom: AddingNew, CurrentItemChanged, AddingNew, CurrentItemChanged,

PositionChangedPositionChanged ListChanged(ListChangedType: Added, Changed, ListChanged(ListChangedType: Added, Changed,

Removed, Moved, ...)Removed, Moved, ...) Properties såsom:Properties såsom:

Current, Filter, Position, Sort, ListCountCurrent, Filter, Position, Sort, ListCount Metoder såsom:Metoder såsom:

Move*, Add, Clear, Remove, RemoveFIlter, Move*, Add, Clear, Remove, RemoveFIlter, RemoveSortRemoveSort

ResetBindings-metoden fortæller ResetBindings-metoden fortæller kontrollerne, at data har ændret sigkontrollerne, at data har ændret sig

DataBinding- DataBinding- BindingNavigatorBindingNavigator En video kontrol der kan bruges til En video kontrol der kan bruges til

navigering og redigeringnavigering og redigering Sæt BindingNavigator-komponentens Sæt BindingNavigator-komponentens

BindingSource-property til et BindingSource-property til et BindingSource objektBindingSource objekt

ToolStripButtons kan let tilføjes og fjernesToolStripButtons kan let tilføjes og fjernes

SpørgsmålSpørgsmål

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