DOT NET Interview Questions - DotNetSpider
DOT NET Interview Questions - DotNetSpider
DOT NET Interview Questions - DotNetSpider
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A SqlConnection object uses Tabular Data Services (TDS) with MS SQL Server<br />
(B)What is the use of command objects and what are the<br />
methods provided by the command object ?<br />
They are used to connect connection object to Datareader or dataset.Following are the<br />
methods provided by command object :-<br />
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√<br />
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ExecuteNonQuery :- Executes the command defined in the CommandText<br />
property against the connection defined in the Connection property for a query<br />
that does not return any rows (an UPDATE, DELETE or INSERT).Returns<br />
an Integer indicating the number of rows affected by the query.<br />
ExecuteReader :- Executes the command defined in the CommandText property<br />
against the connection defined in the Connection property. Returns a "reader"<br />
object that is connected to the resulting rowset within the database, allowing<br />
the rows to be retrieved.<br />
ExecuteScalar :- Executes the command defined in the CommandText property<br />
against the connection defined in the Connection property. Returns only a<br />
single value (effectively the first column of the first row of the resulting rowset).<br />
Any other returned columns and rows are discarded. Fast and efficient when<br />
only a "singleton" value is required<br />
(B)What is the use of dataadapter ?<br />
These are objects that connect one or more Command objects to a Dataset object..They<br />
provide logic that gets the data from the data store and populates the tables in the DataSet,<br />
or pushes the changes in the DataSet back into the data store.<br />
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An OleDbDataAdapter object is used with an OLE-DB provider<br />
A SqlDataAdapter object uses Tabular Data Services with MS SQL Server.<br />
(B)What are basic methods of Dataadapter ?<br />
There are three most commonly used methods of Dataadapter :-<br />
Fill :- Executes the SelectCommand to fill the DataSet object with data from the data<br />
source. Can also be used to update (refresh) an existing table in a DataSet with changes<br />
176<br />
* Author has Intentionally marked all Database questions as Basic belive me not answering<br />
them will not give a good impression during interviews.
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