ADO.NET 2.0 y SQL Server 2005. 2 SQL Server 2005 para desarrolladores Solid Quality Learning Adolfo...

ADO.NET 2.0 y SQL Server 2005

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SQL Server 2005 para desarrolladores Solid Quality Learning

Adolfo [email protected]

Microsoft Regional Director - http://msdn.microsoft.com/isv/rd Mentor Solid Quality Learning - http://www.solidqualitylearning.com Fundador, Costa Rica User Group .NET - http://www.crug.net Orador INETA Latinoamérica - http://www.ineta.org/latam Blog - http://www.wiernik.net

Jose Ricardo [email protected]

En Microsoft desde 1998 Desde el 2003 - Regional Program Manager SQL Server Latinoamérica

http://msdn.microsoft.com/isv/rd






http://www.solidqualitylearning.com/



http://www.crug.net/



http://www.ineta.org/latam





http://www.wiernik.net/

http://www.wiernik.net/

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Series de Webcasts Introducción a SQL Server 2005 para desarrolladores

Viernes, 22 de Julio de 2005 06:00 p.m.(GMT)http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277969&Culture=es-MX

Nuevas características del lenguaje T-SQL en SQL Server 2005Lunes, 25 de Julio de 2005 06:00 p.m.(GMT) http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277973&Culture=es-MX

Aprovechando XML dentro de la base de datos con SQL Server 2005Viernes, 29 de Julio de 2005 06:00 p.m.(GMT) http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277975&Culture=es-MX

Programando SQL Server 2005 con el CLR – Integración SQL-CLRLunes, 01 de Agosto de 2005 06:00 p.m.(GMT) http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277977&Culture=es-MX

Nuevas características en ADO.NET 2.0Viernes, 05 de Agosto de 2005 06:00 p.m.(GMT) http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277978&Culture=es-MX

http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277969&Culture=es-MX































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.NET FrameworkCommon Language Runtime IntegrationUser-defined AggregatesUser-defined Data TypesUser-defined FunctionsSQL Server .NET Data ProviderExtended Triggers

Data TypesManaged SQL TypesNew XML DatatypeVarchar (MAX) Varbinary (MAX)

XMLXQUERY Support XML Data Manipulation Language FOR XML EnhancementsXML Schema (XSD) Support MSXML 6.0 (Native).Net XML Framework

Full-text SearchIndexing of XML Datatype

MDAC SNACMicrosoft Installer base setup

ADO.NET 2.0Notification SupportObject Model enhancements

SQL Client .NET Data ProviderServer Cursor SupportAsynchronous ExecutionSystem.Transactions

SecuritySeparation of Users and SchemaData encryption primitives

AdministrationSQL Management Objects (SMO)Analysis Management Objects

(AMO)Replication Management Objects

(RMO)T-SQL

Recursive QueriesCommon Table ExpressionsPIVOT – UNPIVOT OperatorsAPPLY OperatorException Handling

SQL Server EngineSQL Service BrokerHTTP Support (Native HTTP)Multiple Active Result Sets (MARS)Snapshot Isolation Level

Reporting ServicesMultiple Output Formats Parameters (Static, Dynamic,

Hierarchical)Bulk Delivery of Personalized

ContentSupport Multiple Data Sources STS (Web Parts, Doc Libraries)Visual Design ToolCharting, Sorting, Filtering, Drill-

ThroughScheduling, CachingComplete Scripting EngineScale Out architectureOpen XML Report Definition

Notification ServicesSQL Server Mobile Edition

Nuevas Características para Desarrollo

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SNAC DataSet and DataTable improvements Transactions and TransactionScope Multiple Active Resultsets (MARS) Snapshot Isolation support Asynchronous Support SqlClient Statistics Bulk Copy Tracing

Agenda

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Client-Side Data Access

ADO.NET’s SqlClient contains two types of functional changes• support of new SQL Server 2005

functionality• added client functionality for all support

database versions Most of these changes mimicked in

unmanaged stack Additional changes for all providers

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SQL NAtive Client (SNAC)

SNAC separates SQL client from MDAC• MDAC is part of the OS

• SQL Server 2005 uses MDAC 2.8• MDAC not shipped with SQL Server 2005

• SNAC contains• new OLE DB provider• new ODBC driver

• acts differently than old provider/driver• subtle implementation differences• not supported on Windows 9x

• not used by System.Data.SqlClient (or System.Data.SqlServer)

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SNAC and new functionality

SNAC OLE DB provider and ODBC driver support• snapshot isolation• MARS• "max" data type support• UDT and XML support (not yet)

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DataSet Improvements

CreateDataReader• Similar to streaming data from a DB using DataReader• Returns a DataTableReader with multiple result sets

// Use this to copy tables:myReader = myTable1.CreateDataReader()myTable2.Load(myReader)

Improved Insert/Delete performance• Internal indexing scheme completely rewritten (load API)

Binary Serialization/Persistenceds.RemotingFormat = SerializationFormat.Binary;SerializeDataSet(ds, "ds.dat", SerializationFormat.Binary);

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DataTable Improvements

DataTables are more independent now• ReadXML, ReadXMLSchema• WriteXML, WriteXMLSchema• Load, Merge

CreateDataReader• Returns a DataTableReade

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Load and Update Improvements

DataSets don't need DataAdapters to Load

ds.Load(...) DataTables don't need DataSets or DataAdapters

dt.Load(...) Batched Updates

• In ADO.NET 1.x all updates where 1 row at a time• In ADO.NET 2.0, you set the Adapter's UpdateBatchSize• Defaults to 1 (compatible with 1.x); 0 updates all

adp.UpdateBatchSize = 20;

adp.Update(dt);

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ADO.NET 2.0 Transactions

Transactions in ADO.NET 1.x• Transaction object associated with connection• COMMIT | ROLLBACK in a stored procedure• Enterprise Services (COM+)

Transactions in ADO.NET 2.0• Easier• Same code for single DB (simple) or multiple DB

transactions (complex)• TransactionScope object

"Wrap all your commands in a TransactionScope object, and it takes care of everything for you"

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Simple TransactionScope Example

bool IsConsistent = false;using (System.Transactions.TransactionScope

ts = new System.Transactions.TransactionScope())

{ SqlConnection CN =

newSqlConnection(CONNSTR); string SQL = "DELETE Products"; SqlCommand CMD = newSqlCommand(SQL, CN); cn.Open(); cmd.ExecuteNonQuery(); cn.Close();

ts.Consistent = IsConsistent;}

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Complex TransactionScope Example

bool IsConsistent = false;using (TransactionScope ts = newTransactionScope()){ using (SqlConnection CN1 = newSqlConnection(CONNSQL2005A)) { try { ... Execute SqlCommand #1 using(SqlConnection CN2 = newSqlConnection(CONNSQL2005B)) { ... Execute SqlCommand #2 } IsConsistent = true; } catch (SqlException ex) { ... } cn.Close(); } ts.Consistent = IsConsistent;}

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MARS

Before SQL Server 2005, SQL Server had no multiplexed connections

• connection supported only a single DataReader• could be done with multiple server cursors• ADO classic's answer was to open more connections

Multiple Active Result Sets adds multiplexed connections• multiple streams and composable transactions multiplexed

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The Problem...

SqlConnection conn = new SqlConnection( "server=.;integrated security=sspi;database=pubs");SqlCommand cmd = new SqlCommand( "select * from authors",conn);conn.Open();SqlDataReader rdr = cmd.ExecuteReader();Console.WriteLine("got first reader");

// second reader, same connection – This will not workcmd.CommandText = "select * from jobs";SqlDataReader rdr2 = cmd.ExecuteReader();// attempt to use both readers, but never get to hererdr.Read();rdr2.Read();Console.WriteLine(rdr2[0]);

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The MARS Solution

// MARS is the default with SQL Server 2005 DBSqlConnection conn = new SqlConnection("server=zmv43;integrated security=sspi;database=pubs");

SqlCommand cmd = new SqlCommand("select * from authors",conn);

// must use a separate SqlCommand instanceSqlCommand cmd2 = new SqlCommand("select * from jobs",conn);conn.Open();SqlDataReader rdr = cmd.ExecuteReader();

// second reader, same connection - THIS DOES WORKSqlDataReader rdr2 = cmd2.ExecuteReader();rdr2.Read();rdr.Read(); // both readers on same connectionConsole.WriteLine(rdr[0]);Console.WriteLine(rdr2[0]);

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Behavior Within a Connection

MARS allows multiple "execution paths" per connection• transaction is tied to the execution path• each SqlCommand must be associated with

a SqlTransaction• if there is a transaction in progress

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Snapshot Isolation

Snapshot isolation is supported in SQL Server 2005• just another isolation level in client• must be enabled on server

SqlConnection conn = new SqlConnection( "connect string");SqlTransaction tx = nullSqlCommand cmd = new SqlCommand( "update jobs set job_desc = 'New job" where job_id = 1", conn, tx);try{ conn.Open(); tx = conn.BeginTransaction(IsolationLevel.Snapshot); //...}

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Password change API

Passwords can expire for SQL users in SQL Server 2005• well-known error message returned• must prompt for new password

• no standard password prompt• SqlConnection.ChangePassword to change

• needs old and new passwords• must replace password in config file• precludes storing connection string in program

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Asynchronous Execution

Asynchrony Added at the TDS layer Available in SqlClient using async delegate

• BeginInvoke - EndInvoke pair• can use any common delegate pattern

Variety of command operations are asynchronous• Command.BeginExecuteReader • Command.BeginExecuteNonQuery• Command.BeginExecuteXmlReader

IAsyncResult class can be used to harvest results

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Asynchronous ExecuteReader

// "busywait" example

SqlConnection conn = new SqlConnection( "server=mysvr;integrated security=sspi;database=pubs");conn.ConnectionString += ";async=true";conn.Open();SqlCommand cmd = new SqlCommand("select * from authors", conn);

// execute the command asynchronouslyIAsyncResult ar = cmd.BeginExecuteReader();

// check every 250 ms for resultwhile (!ar.IsCompleted) {Console.Write(".");Thread.Sleep(250);}// harvest resultsSqlDataReader rdr = cmd.EndExecuteReader(ar);

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Bulk Insert

Managed classes to encapsulate some BCP functionality• can write from DataTable or IDataReader• uses a connection and BULK INSERT

• works off-host• import from file and export not supported

• SqlBulkCopy more like IRowsetFastLoad

// bulk copy from a DataReadervoid DoBulkCopy(IDataReader reader){ SqlBulkCopy bcp = new SqlBulkCopy(connectString); bcp.DestinationTableName = "Customers"; bcp.WriteToServer(reader);}

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Summary

SNAC for non-.NET clients DataSet and DataTable improvements SqlClient changes for SQL Server 2005

• SqlClient supports multiple active resultsets• SqlClient supports snapshot isolation• password change API for SQL Server logins• transaction scopes used to implement promotable transactions

SqlClient changes for all SQL Server versions• asynchronous connection and commands• transaction scopes simplify distributed transactions• client statistics• bulk copy support in code

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Series de Webcasts

Introducción a SQL Server 2005 para desarrolladoresViernes, 22 de Julio de 2005 06:00 p.m.(GMT)http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277969&Culture=es-MX

Nuevas características del lenguaje T-SQL en SQL Server 2005Lunes, 25 de Julio de 2005 06:00 p.m.(GMT) http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277973&Culture=es-MX

Aprovechando XML dentro de la base de datos con SQL Server 2005Viernes, 29 de Julio de 2005 06:00 p.m.(GMT) http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277975&Culture=es-MX

Programando SQL Server 2005 con el CLR – Integración SQL-CLRLunes, 01 de Agosto de 2005 06:00 p.m.(GMT) http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277977&Culture=es-MX

Nuevas características en ADO.NET 2.0Viernes, 05 de Agosto de 2005 06:00 p.m.(GMT) http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032277978&Culture=es-MX







Gracias

[email protected]

[email protected]

Weblog: www.wiernik.net

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