public Retrieval <T> Include <TProperty>(Expression <Func <T, TProperty> > propertyExpr)
{
var propertyName = PropertyNameAttribute.GetFromType(propertyExpr);
if (propertyName == "modifiedon" || propertyName == "createdon" || propertyName == "id")
{
return(this);
}
if (!IncludedColumns.Contains(propertyName.ToLower()))
{
IncludedColumns.Add(propertyName);
}
return(this);
}
/// <summary>
/// Gets the column names
/// </summary>
/// <remarks>Because DbfExporter is forward-reading, calling this method multiple times or calling it after <see cref="GetRowFields"/> will throw an exception.</remarks>
/// <returns>Returns the columns of a Dbf as a <see cref="IEnumerable{T}"/> where T is a <see cref="string"/></returns>
public IEnumerable <string> GetColumns()
{
if (FieldCount == 0)
{
ReadHeader();
}
if (Columns.Count > 0)
{
throw new Exception("Column names have already been read");
}
ColumnRenames = ColumnRenames.ToDictionary(d => d.Key.ToUpper(), d => d.Value);
IncludedColumns = IncludedColumns.Select(s => s.ToUpper()).ToList();
bool addColumn = IncludedColumns.Count == 0;
List <string> columnNames = new List <string>();
byte[] columnHeader = new byte[FieldArraySize];
DbfFile.Read(columnHeader, 0, FieldArraySize);
int baseOffset;
int numericDecimal;
int columnOffset = 0;
string pgColumnType;
for (int i = 0; i < FieldCount; ++i)
{
baseOffset = i * FieldDefinitionSize;
byte[] nameBytes = new byte[FieldNameLength];
Array.Copy(columnHeader, baseOffset, nameBytes, 0, FieldNameLength);
string columnName = Encoding.ASCII.GetString(nameBytes).Replace("\0", string.Empty);
if (ColumnRenames.ContainsKey(columnName))
{
columnName = ColumnRenames[columnName];
}
if (ReservedWords.Contains(columnName))
{
int increment = 0;
while (IncludedColumns.Contains($"{columnName}_{++increment}"))
{
;
}
columnName = $"{columnName}_{increment}";
}
if (addColumn)
{
IncludedColumns.Add(columnName);
}
var dbfColumnType = Convert.ToChar(columnHeader[baseOffset + FieldTypeOffset]);
DbfColumn column = dbfColumnType == 'M' ? new MemoColumn() : new DbfColumn();
column.Export = IncludedColumns.Contains(columnName) || addColumn;
column.Type = dbfColumnType;
column.Length = columnHeader[baseOffset + FieldLengthOffset];
column.Offset = columnOffset;
columnOffset += column.Length;
Columns.Add(column);
if (CreateTable)
{
pgColumnType = "TEXT";
if (column.Type == 'N' || column.Type == 'F')
{
if (ConvertNumericToText)
{
pgColumnType = "TEXT";
}
else
{
numericDecimal = columnHeader[baseOffset + FieldDecimalsOffset];
pgColumnType = numericDecimal == 0 ?
$"NUMERIC({column.Length})" :
$"NUMERIC({column.Length},{numericDecimal})";
}
}
else if (column.Type == 'L')
{
if (ConvertBoolToVarChar)
{
column.Type = 'C';
pgColumnType = "VARCHAR(1)";
}
else
{
pgColumnType = "BOOLEAN";
}
}
else if (column.Type == 'M')
{
pgColumnType = "TEXT";
}
else
{
pgColumnType = $"VARCHAR({column.Length})";
}
if (column.Export)
{
columnNames.Add(columnName + " " + pgColumnType);
}
}
else if (column.Export)
{
columnNames.Add(columnName);
}
}
InitMemoFile();
DbfFile.Seek(SkipBytes + 1, SeekOrigin.Current);
return(columnNames);
}
