1 / 10

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.

betty_james
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Programming with ADO.NETBySam NasrApril 27, 2004

  2. 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.

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

  4. 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.

  5. 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.

  6. Connected Objects • Connection • Transaction • DataAdapter • Command • Parameter • DataReader

  7. Disconnected Objects • DataSet • DataTable • DataView • DataRow • DataColumn • Constraint • DataRelation

  8. 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.

  9. 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”

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

More Related