Programming with ADO.NET By Sam Nasr April 27, 2004 Programming with ADO.NET By Sam Nasr April 27, 2004.

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Presentation transcript:

Programming with ADO.NET By Sam Nasr April 27, 2004 Programming with ADO.NET By Sam Nasr April 27, 2004

What is ADO.Net? ADO.NET = ActiveX Data Objects A set of libraries included within the.NET Framework ADO.NET objects are contained in the System.Data namespace.

ADO.Net Terminology Data Store: an object containing data. Data Provider: Classes designed to communicate with a data store.

Advantages of ADO.NET Built for CLR environment to maximize performance. Greater Extensibility: results can be retrieved in XML. Allows the use of the Disconnected Objects (DataSet) Allows multiple dataset objects for a join query. Allows update logic when using a Disconnected Object.

: All ADO.NET objects can be separated into 2 categories: 1. Connected: Objects that communicate directly with the database. 2. Disconnected: Objects that allow the user to work with the data offline.

Connected Objects ConnectionTransactionDataAdapterCommandParameterDataReader

Disconnected Objects DataSetDataTableDataViewDataRowDataColumnConstraintDataRelation

Syntax for a single query statement SqlCommand cmd = new Sqlcommand(select * from customers, _ conn) Adapter.fill(ds) to fill a single dataset Adapter.fill(ds, customers) to fill a single dataset and name it.

Syntax for a multiple query statement SqlCommand cmd = new _ Sqlcommand(select * from customers; select * from orders;, conn) Adapter.fill(ds) Ds.tables[0].TableName = Customers Ds.tables[1].TableName = Orders

Using.UDL files.UDL = Universal Data Link UDL files store a connection string for any data connectivity task. UDL files store a connection string for any data connectivity task. Interface is identical to the Data Adapter.