Sunday, 6 May 2012

What is the difference between ExecuteNonQuery(), ExecuteReader() and ExecuteScalar() methods in ADO.NET || Comparision among Executtion Methods of Command Class


ExecuteNonQuery():
1.will work with Action Queries only (Create,Alter,Drop,Insert,Update,Delete).
2.Retruns the count of rows effected by the Query.
3.Return type is int
4.Return value is optional and can be assigned to an integer variable.

ExecuterReader():
1.will work with Action and Non-Action Queries (Select)
2.Returns the collection of rows selected by the Query.
3.Return type is DataReader.
4.Return value is compulsory and should be assigned to an another object DataReader.

ExecuteScalar():
1.will work with Non-Action Queries that contain aggregate functions.
2.Return the first row and first column value of the query result.
3.Return type is object.
4.Return value is compulsory and should be assingned to a variable of required type.



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