OleDbDataReader Class
Provides a way of reading a forward-only stream of data rows from a data source. This class cannot be inherited.
System::MarshalByRefObject
System.Data.Common::DbDataReader
System.Data.OleDb::OleDbDataReader
Assembly: System.Data (in System.Data.dll)
The OleDbDataReader type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | Depth | Gets a value that indicates the depth of nesting for the current row. (Overrides DbDataReader::Depth.) |
![]() | FieldCount | Gets the number of columns in the current row. (Overrides DbDataReader::FieldCount.) |
![]() | HasRows | Gets a value that indicates whether the OleDbDataReader contains one or more rows. (Overrides DbDataReader::HasRows.) |
![]() | IsClosed | Indicates whether the data reader is closed. (Overrides DbDataReader::IsClosed.) |
![]() | Item[Int32] | Gets the value of the specified column in its native format given the column ordinal. (Overrides DbDataReader::Item[Int32].) |
![]() | Item[String] | Gets the value of the specified column in its native format given the column name. (Overrides DbDataReader::Item[String].) |
![]() | RecordsAffected | Gets the number of rows changed, inserted, or deleted by execution of the SQL statement. (Overrides DbDataReader::RecordsAffected.) |
![]() | VisibleFieldCount | Gets the number of fields in the OleDbDataReader that are not hidden. (Overrides DbDataReader::VisibleFieldCount.) |
| Name | Description | |
|---|---|---|
![]() | Close | Closes the OleDbDataReader object. (Overrides DbDataReader::Close().) |
![]() | CreateObjRef | Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject.) |
![]() | Dispose() | Releases all resources used by the current instance of the DbDataReader class. (Inherited from DbDataReader.) |
![]() | Dispose(Boolean) | Releases the managed resources used by the DbDataReader and optionally releases the unmanaged resources. (Inherited from DbDataReader.) |
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetBoolean | Gets the value of the specified column as a Boolean. (Overrides DbDataReader::GetBoolean(Int32).) |
![]() | GetByte | Gets the value of the specified column as a byte. (Overrides DbDataReader::GetByte(Int32).) |
![]() | GetBytes | Reads a stream of bytes from the specified column offset into the buffer as an array starting at the given buffer offset. (Overrides DbDataReader::GetBytes(Int32, Int64, array<Byte>, Int32, Int32).) |
![]() | GetChar | Gets the value of the specified column as a character. (Overrides DbDataReader::GetChar(Int32).) |
![]() | GetChars | Reads a stream of characters from the specified column offset into the buffer as an array starting at the given buffer offset. (Overrides DbDataReader::GetChars(Int32, Int64, array<Char>, Int32, Int32).) |
![]() | GetData | Returns an OleDbDataReader object for the requested column ordinal. |
![]() | GetDataTypeName | Gets the name of the source data type. (Overrides DbDataReader::GetDataTypeName(Int32).) |
![]() | GetDateTime | Gets the value of the specified column as a DateTime object. (Overrides DbDataReader::GetDateTime(Int32).) |
![]() | GetDbDataReader | Returns a DbDataReader object for the requested column ordinal that can be overridden with a provider-specific implementation. (Inherited from DbDataReader.) |
![]() | GetDecimal | Gets the value of the specified column as a Decimal object. (Overrides DbDataReader::GetDecimal(Int32).) |
![]() | GetDouble | Gets the value of the specified column as a double-precision floating-point number. (Overrides DbDataReader::GetDouble(Int32).) |
![]() | GetEnumerator | Returns an IEnumerator that can be used to iterate through the rows in the data reader. (Overrides DbDataReader::GetEnumerator().) |
![]() | GetFieldType | Gets the Type that is the data type of the object. (Overrides DbDataReader::GetFieldType(Int32).) |
![]() | GetFloat | Gets the value of the specified column as a single-precision floating-point number. (Overrides DbDataReader::GetFloat(Int32).) |
![]() | GetGuid | Gets the value of the specified column as a globally unique identifier (GUID). (Overrides DbDataReader::GetGuid(Int32).) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetInt16 | Gets the value of the specified column as a 16-bit signed integer. (Overrides DbDataReader::GetInt16(Int32).) |
![]() | GetInt32 | Gets the value of the specified column as a 32-bit signed integer. (Overrides DbDataReader::GetInt32(Int32).) |
![]() | GetInt64 | Gets the value of the specified column as a 64-bit signed integer. (Overrides DbDataReader::GetInt64(Int32).) |
![]() | GetLifetimeService | Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject.) |
![]() | GetName | Gets the name of the specified column. (Overrides DbDataReader::GetName(Int32).) |
![]() | GetOrdinal | Gets the column ordinal, given the name of the column. (Overrides DbDataReader::GetOrdinal(String).) |
![]() | GetProviderSpecificFieldType | Returns the provider-specific field type of the specified column. (Inherited from DbDataReader.) |
![]() | GetProviderSpecificValue | Gets the value of the specified column as an instance of Object. (Inherited from DbDataReader.) |
![]() | GetProviderSpecificValues | Gets all provider-specific attribute columns in the collection for the current row. (Inherited from DbDataReader.) |
![]() | GetSchemaTable | Returns a DataTable that describes the column metadata of the OleDbDataReader. (Overrides DbDataReader::GetSchemaTable().) |
![]() | GetString | Gets the value of the specified column as a string. (Overrides DbDataReader::GetString(Int32).) |
![]() | GetTimeSpan | Gets the value of the specified column as a TimeSpan object. |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | GetValue | Gets the value of the column at the specified ordinal in its native format. (Overrides DbDataReader::GetValue(Int32).) |
![]() | GetValues | Populates an array of objects with the column values of the current row. (Overrides DbDataReader::GetValues(array<Object>).) |
![]() | InitializeLifetimeService | Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject.) |
![]() | IsDBNull | Gets a value that indicates whether the column contains nonexistent or missing values. (Overrides DbDataReader::IsDBNull(Int32).) |
![]() | MemberwiseClone() | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | MemberwiseClone(Boolean) | Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject.) |
![]() | NextResult | Advances the data reader to the next result, when reading the results of batch SQL statements. (Overrides DbDataReader::NextResult().) |
![]() | Read | Advances the OleDbDataReader to the next record. (Overrides DbDataReader::Read().) |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
| Name | Description | |
|---|---|---|
![]() ![]() | IDataRecord::GetData | For a description of this member, see IDataRecord::GetData. (Inherited from DbDataReader.) |
To create an OleDbDataReader, you must call the ExecuteReader method of the OleDbCommand object, instead of directly using a constructor.
Before you close the OleDbConnection, first close the OleDbDataReader object. You must also close the OleDbDataReader object if you plan to resuse an OleDbCommand object.For example, you cannot retrieve output parameters until after you call Close.
Changes made to a result set by another process or thread while data is being read may be visible to the user of the OleDbDataReader. However, the precise behavior is timing dependent.
IsClosed and RecordsAffected are the only properties that you can call after the OleDbDataReader is closed. Although the RecordsAffected property may be accessed while the OleDbDataReader exists, always call Close before returning the value of RecordsAffected to guarantee an accurate return value.
The following example creates an OleDbConnection, an OleDbCommand, and an OleDbDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the OleDbDataReader and then the OleDbConnection.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
