/// <summary>
/// Check that every column specified in the mappings collection exists
/// in the wrapped reader.
/// </summary>
void ValidateBulkCopySourceColumnMappings(SqlBulkCopyColumnMappingCollection mappings)
{
foreach (SqlBulkCopyColumnMapping mapping in mappings)
{
var sc = new SqlName(mapping.SourceColumn);
if (!String.IsNullOrEmpty(sc.Name))
{
if (wrappedReader.GetOrdinal(sc.Name) == -1)
{
string bestFit = wrappedReader.GetColumns().SingleOrDefault(c => c.Equals(sc.Name, StringComparison.OrdinalIgnoreCase));
if (bestFit == null)
{
throw new SchemaException("Source column " + mapping.SourceColumn + " does not exist in source.");
}
else
{
throw new SchemaException
(
"Source column " + mapping.SourceColumn + " does not exist in source." +
" Column name mappings are case specific and best found match is " + bestFit + "."
);
}
}
}
else
{
if (mapping.SourceOrdinal < 0 || mapping.SourceOrdinal >= wrappedReader.FieldCount)
{
throw new SchemaException("No column exists at index " + mapping.SourceOrdinal + " in source.");
}
}
}
}
void ValidateBulkCopyDestinationColumnMappings
(
SqlBulkCopyColumnMappingCollection mappings,
Dictionary <string, int> columnLookup,
DataRow[] columns
)
{
foreach (SqlBulkCopyColumnMapping mapping in mappings)
{
var destColumn = new SqlName(mapping.DestinationColumn);
if (!String.IsNullOrEmpty(destColumn.Name))
{
if (!columnLookup.ContainsKey(destColumn.Name))
{
// If we can't find an exact match by case, try for a case-insensitive match.
string bestFit = columnLookup.Keys.SingleOrDefault(c => c.Equals(destColumn.Name, StringComparison.OrdinalIgnoreCase));
if (bestFit == null)
{
throw new SchemaException
(
"Destination column " + mapping.DestinationColumn +
" does not exist in destination table " + targetTableName +
" in database " + targetDatabaseName +
" on server " + targetServerName + "."
);
}
else
{
throw new SchemaException
(
"Destination column " + mapping.DestinationColumn +
" does not exist in destination table " + targetTableName +
" in database " + targetDatabaseName +
" on server " + targetServerName +
". Column name mappings are case specific and best found match is " + bestFit + "."
);
}
}
}
else
{
if (mapping.DestinationOrdinal < 0 || mapping.DestinationOrdinal >= columns.Length)
{
throw new SchemaException
(
"No column exists at index " + mapping.DestinationOrdinal +
" in destination table " + targetTableName +
" in database " + targetDatabaseName +
" on server " + targetServerName + "."
);
}
}
}
}
void CreateLookupFromColumnMappings
(
SqlBulkCopyColumnMappingCollection mappings,
DataTable schemaTableOfDestinationTable
)
{
// create lookup dest column definition by source index
foreach (SqlBulkCopyColumnMapping mapping in mappings)
{
int sourceIndex = -1;
var sourceColumn = new SqlName(mapping.SourceColumn);
if (!String.IsNullOrEmpty(sourceColumn.Name))
{
sourceIndex = wrappedReader.GetOrdinal(sourceColumn.Name);
}
else
{
sourceIndex = mapping.SourceOrdinal;
}
DataRow destColumnDef = null;
var destColumn = new SqlName(mapping.DestinationColumn);
if (!String.IsNullOrEmpty(destColumn.Name))
{
destColumnDef = schemaTableOfDestinationTable.Rows.Cast <DataRow>().
Single(c => (string)c["ColumnName"] == destColumn.Name);
//foreach (DataRow column in schemaTableOfDestinationTable.Rows)
//{
// if ((string)column["ColumnName"] == destColumn.Name)
// {
// destColumnDef = column;
// break;
// }
//}
}
else
{
destColumnDef = schemaTableOfDestinationTable.Rows.Cast <DataRow>().
Single(c => (int)c["ColumnOrdinal"] == mapping.DestinationOrdinal);
//foreach (DataRow column in schemaTableOfDestinationTable.Rows)
//{
// if ((int)column["ColumnOrdinal"] == mapping.DestinationOrdinal)
// {
// destColumnDef = column;
// break;
// }
//}
}
lookup[sourceIndex] = destColumnDef;
}
}
