/// <summary>
/// Returns a DataTable that describes the column metadata of the DBase file.
/// </summary>
/// <returns>A DataTable that describes the column metadata.</returns>
public DataTable GetSchemaTable()
{
DataTable schema = DbaseSchema.CreateSchemaTable();
foreach (DbaseField dbf in _dbaseColumns)
{
schema.Columns.Add(dbf.ColumnName, dbf.DataType);
}
for (int i = 0; i < _dbaseColumns.Length; i++)
{
DataRow r = schema.NewRow();
r[DbaseSchema.ColumnNameColumn] = _dbaseColumns[i].ColumnName;
r[DbaseSchema.ColumnSizeColumn] = _dbaseColumns[i].Length;
r[DbaseSchema.ColumnOrdinalColumn] = i;
r[DbaseSchema.NumericPrecisionColumn] = _dbaseColumns[i].Decimals;
r[DbaseSchema.NumericScaleColumn] = 0;
r[DbaseSchema.DataTypeColumn] = _dbaseColumns[i].DataType;
r[DbaseSchema.AllowDBNullColumn] = true;
r[DbaseSchema.IsReadOnlyColumn] = true;
r[DbaseSchema.IsUniqueColumn] = false;
r[DbaseSchema.IsRowVersionColumn] = false;
r[DbaseSchema.IsKeyColumn] = false;
r[DbaseSchema.IsAutoIncrementColumn] = false;
r[DbaseSchema.IsLongColumn] = false;
// specializations, if ID is unique
//if (_ColumnNames[i] == "ID")
// r["IsUnique"] = true;
schema.Rows.Add(r);
}
return(schema);
}
public DbaseWriter(string filename)
{
_dbaseFileStream = File.Open(filename, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);
_dbaseWriter = new BinaryWriter(_dbaseFileStream, Encoding.ASCII);
_dbaseReader = new BinaryReader(_dbaseFileStream);
if (_dbaseFileStream.Length > 0)
{
_header = DbaseHeader.ParseDbfHeader(_dbaseReader);
_schema = DbaseSchema.GetFeatureTableForFields(_header.Columns);
}
}
public DbaseWriter(FileStream file, DbaseField[] fields)
{
_dbaseFileStream = file;
_dbaseWriter = new BinaryWriter(_dbaseFileStream, Encoding.ASCII);
if (file.CanRead)
{
_dbaseReader = new BinaryReader(_dbaseFileStream);
}
_header.Columns = fields;
_schema = DbaseSchema.GetFeatureTableForFields(fields);
writeFullHeader();
}
public DbaseWriter(FileStream file, DataTable schema)
{
_dbaseFileStream = file;
_dbaseWriter = new BinaryWriter(_dbaseFileStream, Encoding.ASCII);
if (file.CanRead)
{
_dbaseReader = new BinaryReader(_dbaseFileStream);
}
_schema = schema;
_header.Columns = DbaseSchema.GetFields(schema);
writeFullHeader();
}
private void writeFullHeader()
{
_dbaseWriter.Seek(0, SeekOrigin.Begin);
_dbaseWriter.Write(DbaseConstants.DbfVersionCode);
_dbaseWriter.Write(new byte[3] {
(byte)(_header.LastUpdate.Year - DbaseConstants.DbaseEpoch), (byte)_header.LastUpdate.Month, (byte)_header.LastUpdate.Day
});
_dbaseWriter.Write(_header.RecordCount);
_dbaseWriter.Write(_header.HeaderLength);
_dbaseWriter.Write(_header.RecordLength);
_dbaseWriter.Write(new byte[DbaseConstants.EncodingOffset - (int)_dbaseWriter.BaseStream.Position]);
_dbaseWriter.Write(_header.LanguageDriver);
_dbaseWriter.Write(new byte[2]);
foreach (DbaseField field in _header.Columns)
{
string colName = field.ColumnName + new String('\0', DbaseConstants.FieldNameLength);
byte[] colNameBytes = Encoding.ASCII.GetBytes(colName.Substring(0, DbaseConstants.FieldNameLength));
_dbaseWriter.Write(colNameBytes);
char fieldTypeCode = DbaseSchema.GetFieldTypeCode(field.DataType);
_dbaseWriter.Write(fieldTypeCode);
_dbaseWriter.Write(field.Address);
if (fieldTypeCode == 'N' || fieldTypeCode == 'F')
{
_dbaseWriter.Write((byte)field.Length);
_dbaseWriter.Write(field.Decimals);
}
else
{
_dbaseWriter.Write((byte)field.Length);
_dbaseWriter.Write((byte)(field.Length >> 8));
}
_dbaseWriter.Write(new byte[14]);
}
_dbaseWriter.Write(DbaseConstants.HeaderTerminator);
}
