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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.oracleclient.oraclecommand.executereader below:

OracleCommand.ExecuteReader Method (System.Data.OracleClient) | Microsoft Learn

OracleCommand.ExecuteReader Method Definition Overloads ExecuteReader()

public:
 System::Data::OracleClient::OracleDataReader ^ ExecuteReader();

public System.Data.OracleClient.OracleDataReader ExecuteReader();

member this.ExecuteReader : unit -> System.Data.OracleClient.OracleDataReader

override this.ExecuteReader : unit -> System.Data.OracleClient.OracleDataReader

Public Function ExecuteReader () As OracleDataReader

Returns

An OracleDataReader object.

Remarks

When the CommandType property is set to StoredProcedure, the CommandText property should be set to the name of the stored procedure. The command then executes this stored procedure when you call ExecuteReader.

More than one OracleDataReader can be open at any given time.

See also

Working with Commands

ExecuteReader(CommandBehavior)

public:
 System::Data::OracleClient::OracleDataReader ^ ExecuteReader(System::Data::CommandBehavior behavior);

public System.Data.OracleClient.OracleDataReader ExecuteReader(System.Data.CommandBehavior behavior);

member this.ExecuteReader : System.Data.CommandBehavior -> System.Data.OracleClient.OracleDataReader

override this.ExecuteReader : System.Data.CommandBehavior -> System.Data.OracleClient.OracleDataReader

Public Function ExecuteReader (behavior As CommandBehavior) As OracleDataReader

Parameters Returns

An OracleDataReader object.

Remarks

If you expect your SQL statement to return only a single row, specifying SingleRow as the CommandBehavior value may improve application performance.

The OracleDataReader supports a special mode that enables large binary values to be read efficiently. For more information, see the SequentialAccess setting for CommandBehavior.

More than one OracleDataReader can be open at any given time.