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DataReaderExtensions.cs
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65 lines (55 loc) · 2.01 KB
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using System.Collections.Generic;
using System.Linq;
using System.Data;
using Simple.Data.Extensions;
namespace Simple.Data.Ado
{
using System;
public static class DataReaderExtensions
{
public static IDictionary<string,object> ToDictionary(this IDataReader dataReader)
{
return dataReader.ToDictionary(dataReader.CreateDictionaryIndex());
}
public static IEnumerable<IDictionary<string, object>> ToDictionaries(this IDataReader reader)
{
using (reader)
{
return ToDictionariesImpl(reader).ToArray().AsEnumerable();
}
}
public static IEnumerable<IEnumerable<IDictionary<string, object>>> ToMultipleDictionaries(this IDataReader reader)
{
using (reader)
{
return ToMultipleDictionariesImpl(reader).ToArray().AsEnumerable();
}
}
private static IEnumerable<IEnumerable<IDictionary<string,object>>> ToMultipleDictionariesImpl(IDataReader reader)
{
do
{
yield return ToDictionariesImpl(reader).ToArray().AsEnumerable();
} while (reader.NextResult());
}
private static IEnumerable<IDictionary<string,object>> ToDictionariesImpl(IDataReader reader)
{
var index = reader.CreateDictionaryIndex();
var values = new object[reader.FieldCount];
while (reader.Read())
{
reader.GetValues(values);
ReplaceDbNullsWithClrNulls(values);
yield return OptimizedDictionary.Create(index, values);
}
}
private static void ReplaceDbNullsWithClrNulls(object[] values)
{
int dbNullIndex;
while ((dbNullIndex = Array.IndexOf(values, DBNull.Value)) > -1)
{
values[dbNullIndex] = null;
}
}
}
}