C# Class Azavea.Open.DAO.CSV.CsvDataReader

A datareader that reads CSV files.

Inheritance: UnqueryableDataReader

Mostra file Open project: azavea/net-dao-csv Class Usage Examples

Public Methods

Method	Description
Close ( ) : void	Closes the T:System.Data.IDataReader Object.
CsvDataReader ( CsvDaLayer layer, ClassMapping mapping, DaoCriteria criteria ) : System	Create the data reader.
GetBytes ( int i, long fieldOffset, byte buffer, int bufferoffset, int length ) : long	Reads a stream of bytes from the specified column offset into the buffer as an array, starting at the given buffer offset.
GetChars ( int i, long fieldoffset, char buffer, int bufferoffset, int length ) : long	Reads a stream of characters from the specified column offset into the buffer as an array, starting at the given buffer offset.
GetData ( int i ) : IDataReader	Returns an T:System.Data.IDataReader for the specified column ordinal.
GetFieldType ( int i ) : Type	Gets the T:System.Type information corresponding to the type of T:System.Object that would be returned from M:System.Data.IDataRecord.GetValue(System.Int32).
GetGuid ( int i ) : System.Guid	Returns the GUID value of the specified field.
GetName ( int i ) : string	Gets the name for the field to find.
GetSchemaTable ( ) : DataTable	Returns a T:System.Data.DataTable that describes the column metadata of the T:System.Data.IDataReader.
GetValues ( object values ) : int	Gets all the attribute fields in the collection for the current record.
NextResult ( ) : bool	Advances the data reader to the next result, when reading the results of batch SQL statements.

Protected Methods

Method	Description
GetColumnIndex ( string colName ) : int	Helper so the data access layer can be efficient in reading/rewriting CSVs.
ReadRawRow ( ) : IList	This reads the row from the CSV. It basically just tokenizes it, it does not verify that there are any particular number of values or anything else.

Private Methods

Method	Description
GetConfig ( CsvDaLayer layer, ClassMapping mapping ) : DataReaderConfig
ReadRawCsvRow ( TextReader reader ) : IList

Method Details

Close() public method

Closes the T:System.Data.IDataReader Object.

public Close ( ) : void
return	void

CsvDataReader() public method

Create the data reader.

public CsvDataReader ( CsvDaLayer layer, ClassMapping mapping, DaoCriteria criteria ) : System
layer	CsvDaLayer	Data access layer that will give us the TextReader we need.
mapping	ClassMapping	ClassMapping for the type we're returning.
criteria	Azavea.Open.DAO.Criteria.DaoCriteria	Since there is no way to filter before we read the file, /// the reader checks each row read to see if it matches the /// criteria, if not, it is skipped.
return	System

GetBytes() public method

Reads a stream of bytes from the specified column offset into the buffer as an array, starting at the given buffer offset.

The index passed was outside the range of 0 through .

public GetBytes ( int i, long fieldOffset, byte buffer, int bufferoffset, int length ) : long
i	int	The zero-based column ordinal.
fieldOffset	long	The index within the field from which to start the read operation.
buffer	byte	The buffer into which to read the stream of bytes.
bufferoffset	int	The index for to start the read operation.
length	int	The number of bytes to read.
return	long

GetChars() public method

Reads a stream of characters from the specified column offset into the buffer as an array, starting at the given buffer offset.

The index passed was outside the range of 0 through .

public GetChars ( int i, long fieldoffset, char buffer, int bufferoffset, int length ) : long
i	int	The zero-based column ordinal.
fieldoffset	long	The index within the row from which to start the read operation.
buffer	char	The buffer into which to read the stream of bytes.
bufferoffset	int	The index for to start the read operation.
length	int	The number of bytes to read.
return	long

GetColumnIndex() protected method

Helper so the data access layer can be efficient in reading/rewriting CSVs.

protected GetColumnIndex ( string colName ) : int
colName	string
return	int

GetData() public method

Returns an T:System.Data.IDataReader for the specified column ordinal.

The index passed was outside the range of 0 through .

public GetData ( int i ) : IDataReader
i	int	The index of the field to find.
return	IDataReader

GetFieldType() public method

Gets the T:System.Type information corresponding to the type of T:System.Object that would be returned from M:System.Data.IDataRecord.GetValue(System.Int32).

The index passed was outside the range of 0 through .

public GetFieldType ( int i ) : Type
i	int	The index of the field to find.
return	System.Type

GetGuid() public method

Returns the GUID value of the specified field.

The index passed was outside the range of 0 through .

public GetGuid ( int i ) : System.Guid
i	int	The index of the field to find.
return	System.Guid

GetName() public method

Gets the name for the field to find.

The index passed was outside the range of 0 through .

public GetName ( int i ) : string
i	int	The index of the field to find.
return	string

GetSchemaTable() public method

Returns a T:System.Data.DataTable that describes the column metadata of the T:System.Data.IDataReader.

The is closed.

public GetSchemaTable ( ) : DataTable
return	System.Data.DataTable

GetValues() public method

Gets all the attribute fields in the collection for the current record.

public GetValues ( object values ) : int
values	object	An array of to copy the attribute fields into.
return	int

NextResult() public method

Advances the data reader to the next result, when reading the results of batch SQL statements.

public NextResult ( ) : bool
return	bool

ReadRawRow() protected method

This reads the row from the CSV. It basically just tokenizes it, it does not verify that there are any particular number of values or anything else.

protected ReadRawRow ( ) : IList
return	IList