public virtual IRelationalValueBufferFactory CreateValueBufferFactory(
IRelationalValueBufferFactoryFactory relationalValueBufferFactoryFactory, DbDataReader _)
{
Check.NotNull(relationalValueBufferFactoryFactory, nameof(relationalValueBufferFactoryFactory));
return(relationalValueBufferFactoryFactory
.CreateValueBufferFactory(_selectExpression.GetProjectionTypes().ToArray(), indexMap: null));
}
private IRelationalValueBufferFactory CreateValueBufferFactory()
=> _valueBufferFactoryFactory
.CreateValueBufferFactory(
ColumnModifications
.Where(c => c.IsRead)
.Select(c => c.Property.ClrType)
.ToArray(),
indexMap: null);
public virtual IRelationalValueBufferFactory CreateValueBufferFactory(
IRelationalValueBufferFactoryFactory relationalValueBufferFactoryFactory, DbDataReader dataReader)
{
Check.NotNull(relationalValueBufferFactoryFactory, nameof(relationalValueBufferFactoryFactory));
Check.NotNull(dataReader, nameof(dataReader));
var readerColumns
= Enumerable
.Range(0, dataReader.FieldCount)
.Select(i => new
{
Name = dataReader.GetName(i),
Ordinal = i
})
.ToList();
var types = new Type[_selectExpression.Projection.Count];
var indexMap = new int[_selectExpression.Projection.Count];
for (var i = 0; i < _selectExpression.Projection.Count; i++)
{
var aliasExpression = _selectExpression.Projection[i] as AliasExpression;
if (aliasExpression != null)
{
var columnName
= aliasExpression.Alias
?? aliasExpression.TryGetColumnExpression()?.Name;
if (columnName != null)
{
var readerColumn
= readerColumns.SingleOrDefault(c =>
string.Equals(columnName, c.Name, StringComparison.OrdinalIgnoreCase));
if (readerColumn == null)
{
throw new InvalidOperationException(Strings.FromSqlMissingColumn(columnName));
}
types[i] = _selectExpression.Projection[i].Type;
indexMap[i] = readerColumn.Ordinal;
}
}
}
return(relationalValueBufferFactoryFactory.CreateValueBufferFactory(types, indexMap));
}