public object Select(RawTableJoinRow rows)
{
var selectExpression = ParseAsSelect(_FunctionCall.Sql);
var querySpecification = (SqlQuerySpecification)selectExpression.SelectSpecification.QueryExpression;
var db = (( MemoryDbConnection )_RawData.Command.Connection).GetMemoryDatabase( );
var batch = new MemoryDbDataReader.ResultBatch( );
var rawData = new RawData(_RawData.Command, batch);
rawData.RawRowList.Add(rows);
var statement = new ExecuteQueryStatement(db, _RawData.Command);
statement.InitializeFields(batch, querySpecification.SelectClause.Children.ToList( ), rawData);
new QueryResultBuilder(rawData, false).AddData(batch);
var row = batch.ResultRows[0];
for (int fieldIndex = 0; fieldIndex < batch.Fields.Count; fieldIndex++)
{
if (row[fieldIndex] != null && row[fieldIndex] is DBNull == false)
{
_DbType = (DbType)Enum.Parse(typeof(DbType), batch.Fields[fieldIndex].DbType, true);
_ReturnType = batch.Fields[fieldIndex].NetType;
return(row[fieldIndex]);
}
}
return(null);
}
public static object GetValue(SqlScalarExpression expression, MemoryDbDataReader.ResultBatch batch, ArrayList row)
{
switch (expression)
{
case SqlColumnRefExpression columnRef:
{
var name = GetColumnName(columnRef);
var field = batch.Fields.FirstOrDefault(f => f.Name == name);
if (field == null)
{
throw new SqlInvalidColumnNameException(name);
}
return(row[field.FieldIndex]);
}
case SqlLiteralExpression literal:
{
if (literal.Type == LiteralValueType.Integer)
{
var fieldIndex = int.Parse(literal.Value);
return(row[fieldIndex]);
}
throw new NotImplementedException($"Unsupported scalarExpression : '{ expression.GetType( ) }'");
}
default:
throw new NotImplementedException($"Unsupported scalarExpression : '{ expression.GetType( ) }'");
}
}
public void AddData(MemoryDbDataReader.ResultBatch batch)
{
var internalList = new List <InternalResultRow>( );
var fields = batch.Fields.Cast <MemoryDbDataReader.ReaderFieldData>( ).ToList();
var isAggregate = fields
.Any(s => s.SelectFieldData is ISelectDataAggregate);
if (_RawData.GroupByFields.Any( ) || isAggregate)
{
AddAggregateRowData(internalList, fields);
}
else
{
AddRowData(internalList, fields);
}
batch.ResultRows = AddOrderedResultRows(batch, fields, internalList, _RawData.SortOrder);
if (batch.MaxRowsCount.HasValue)
{
batch.ResultRows = batch.ResultRows.Take(batch.MaxRowsCount.Value).ToList( );
}
}
