The following are the core objects :
Connection------->
IDbConnection----->
Provides the ability to connect to or disconnect from datastore.
Command-------->
IDbCommand------>
Represents a sql query or Stored Procedure
Data Reader------->
IDataReader,IDataRecord---->
Provides a forward-only read only access to data using a server side Cursor.
DataAdapter------>
IDataAdapter,IDbDataAdapter--->
Transfers datasets between the caller and data store.
Parameter----------->
IDataParameter,IDbDataParameter--->
Represents a named parameter with a parameterized query.
Transaction--------->
IDbTransaction----------->
Encapsulates a Db Transaction.
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