private void SetColumnMetaData(object compilationColumns, int hiddenColumns)
{
Debug.WriteLineIf(CLI.FnTrace.Enabled, "ManagedCommand.SetColumnMetaData");
object[] descriptions = null;
if (compilationColumns is object[])
{
descriptions = (object[])compilationColumns;
}
if (descriptions == null || descriptions.Length == 0)
{
columns = null;
return;
}
bool hasKeyColumns = false;
columns = new ColumnData[descriptions.Length];
for (int i = 0; i < columns.Length; i++)
{
object[] description = (object[])descriptions[i];
ColumnData column = new ColumnData();
columns[i] = column;
ColumnFlags flags = (ColumnFlags)description[11];
column.columnName = (string)description[0];
column.columnType = DataTypeInfo.MapDvType((BoxTag)description[1]);
if (0 != (flags & ColumnFlags.CDF_XMLTYPE))
{
Debug.WriteLineIf(SqlXml.Switch.TraceVerbose,
String.Format("Set XML type for {0}", column.columnName));
column.columnType = DataTypeInfo.Xml;
}
if (column.columnType == null)
{
throw new SystemException("Unknown data type");
}
column.bufferType = column.columnType.bufferType;
column.columnSize = column.columnType.GetFieldSize((int)description[3]);
column.precision = (short)column.columnSize;
column.scale = (short)((int)description[2]);
column.IsLong = column.columnType.isLong;
column.IsNullable = (0 != (int)description[4]);
CLI.Updatable updatable = (CLI.Updatable)(int) description[5];
column.IsReadOnly = (updatable == CLI.Updatable.SQL_ATTR_READONLY);
column.IsAutoIncrement = (0 != (flags & ColumnFlags.CDF_AUTOINCREMENT));
column.IsKey = (0 != (flags & ColumnFlags.CDF_KEY));
if (column.IsKey)
{
hasKeyColumns = true;
}
column.IsHidden = (i >= (columns.Length - hiddenColumns));
column.IsRowVersion = (column.columnType == DataTypeInfo.Timestamp);
// TODO: check for unique columns as well.
column.IsUnique = false;
column.baseCatalogName = (string)Values.NullIfZero(description[7]);
column.baseColumnName = (string)Values.NullIfZero(description[8]);
column.baseSchemaName = (string)Values.NullIfZero(description[9]);
column.baseTableName = (string)Values.NullIfZero(description[10]);
if (column.baseTableName == null || column.baseTableName == "")
{
column.IsExpression = true;
}
else
{
column.IsExpression = false;
}
}
if (uniqueRows && !hasKeyColumns)
{
uniqueRows = false;
}
}
