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Proper handling of NextResult in Cached Reader

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This commit is contained in:
Grzegorz Russek
2026-01-13 16:35:57 +01:00
parent 158ddc5773
commit ec548a79ab
1 changed files with 212 additions and 156 deletions
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368
DynamORM/DynamicCachedReader.cs
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@@ -1,12 +1,12 @@
using System;
using DynamORM.Helpers;
using DynamORM.Mapper;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Dynamic;
using System.IO;
using System.Linq;
using DynamORM.Helpers;
using DynamORM.Mapper;
namespace DynamORM
{
@@ -15,16 +15,23 @@ namespace DynamORM
{
#region Constructor and Data
private DataTable _schema;
private int _fields;
private int _rows;
private int _position;
private int _cachePos;
private class Data
{
internal DataTable _schema;
internal int _fields;
internal int _rows;
internal int _rowsAffected;
internal int _position = -1;
internal int _cachePos = -1;
private IList<string> _names;
private IDictionary<string, int> _ordinals;
private IList<Type> _types;
private IList<object> _cache;
internal IList<string> _names;
internal IDictionary<string, int> _ordinals;
internal IList<Type> _types;
internal IList<object> _cache;
}
private List<Data> _data = new List<Data>();
private int _currentDataPosition = 0;
private DynamicCachedReader()
{
@@ -58,8 +65,12 @@ namespace DynamORM
var r = new DynamicCachedReader();
r.Init(firstDict.Keys.Count);
r._data.Add(new Data());
var data = r._data[r._currentDataPosition];
for (int i = 0; i < firstDict.Keys.Count; i++)
r._types.Add(null);
data._types.Add(null);
foreach (dynamic elem in (objects as IEnumerable<dynamic>))
{
@@ -70,60 +81,60 @@ namespace DynamORM
{
object val = dict[k];
r._cache.Add(val);
data._cache.Add(val);
if (r._types[c] == null && val != null)
r._types[c] = val.GetType();
if (data._types[c] == null && val != null)
data._types[c] = val.GetType();
c++;
}
r._rows++;
data._rows++;
}
for (int i = 0; i < firstDict.Keys.Count; i++)
if (r._types[i] == null)
r._types[i] = typeof(string);
if (data._types[i] == null)
data._types[i] = typeof(string);
r._schema = new DataTable("DYNAMIC");
r._schema.Columns.Add(new DataColumn("ColumnName", typeof(string)));
r._schema.Columns.Add(new DataColumn("ColumnOrdinal", typeof(int)));
r._schema.Columns.Add(new DataColumn("ColumnSize", typeof(int)));
r._schema.Columns.Add(new DataColumn("NumericPrecision", typeof(short)));
r._schema.Columns.Add(new DataColumn("NumericScale", typeof(short)));
r._schema.Columns.Add(new DataColumn("DataType", typeof(Type)));
r._schema.Columns.Add(new DataColumn("ProviderType", typeof(int)));
r._schema.Columns.Add(new DataColumn("NativeType", typeof(int)));
r._schema.Columns.Add(new DataColumn("AllowDBNull", typeof(bool)));
r._schema.Columns.Add(new DataColumn("IsUnique", typeof(bool)));
r._schema.Columns.Add(new DataColumn("IsKey", typeof(bool)));
r._schema.Columns.Add(new DataColumn("IsAutoIncrement", typeof(bool)));
data._schema = new DataTable("DYNAMIC");
data._schema.Columns.Add(new DataColumn("ColumnName", typeof(string)));
data._schema.Columns.Add(new DataColumn("ColumnOrdinal", typeof(int)));
data._schema.Columns.Add(new DataColumn("ColumnSize", typeof(int)));
data._schema.Columns.Add(new DataColumn("NumericPrecision", typeof(short)));
data._schema.Columns.Add(new DataColumn("NumericScale", typeof(short)));
data._schema.Columns.Add(new DataColumn("DataType", typeof(Type)));
data._schema.Columns.Add(new DataColumn("ProviderType", typeof(int)));
data._schema.Columns.Add(new DataColumn("NativeType", typeof(int)));
data._schema.Columns.Add(new DataColumn("AllowDBNull", typeof(bool)));
data._schema.Columns.Add(new DataColumn("IsUnique", typeof(bool)));
data._schema.Columns.Add(new DataColumn("IsKey", typeof(bool)));
data._schema.Columns.Add(new DataColumn("IsAutoIncrement", typeof(bool)));
int ordinal = 0;
DataRow dr = null;
foreach (var column in firstDict.Keys)
{
dr = r._schema.NewRow();
dr = data._schema.NewRow();
dr[0] = column;
dr[1] = ordinal;
dr[2] = 0;
dr[3] = 0;
dr[4] = 0;
dr[5] = r._types[ordinal];
dr[6] = r._types[ordinal].ToDbType();
dr[7] = r._types[ordinal].ToDbType();
dr[5] = data._types[ordinal];
dr[6] = data._types[ordinal].ToDbType();
dr[7] = data._types[ordinal].ToDbType();
dr[8] = true;
dr[9] = false;
dr[10] = false;
dr[11] = false;
r._schema.Rows.Add(dr);
data._schema.Rows.Add(dr);
r._names.Add(dr[0].ToString());
r._ordinals.Add(dr[0].ToString().ToUpper(), ordinal++);
r._types.Add((Type)dr[5]);
data._names.Add(dr[0].ToString());
data._ordinals.Add(dr[0].ToString().ToUpper(), ordinal++);
data._types.Add((Type)dr[5]);
dr.AcceptChanges();
}
@@ -150,8 +161,6 @@ namespace DynamORM
r.FillFromEnumerable(objects, mapper);
r.IsClosed = false;
r._position = -1;
r._cachePos = -1;
return r;
}
@@ -173,64 +182,68 @@ namespace DynamORM
r.FillFromEnumerable(elementType, objects, mapper);
r.IsClosed = false;
r._position = -1;
r._cachePos = -1;
return r;
}
private void InitDataReader(IDataReader reader, int offset = 0, int limit = -1, Func<DynamicCachedReader, int, bool> progress = null)
{
_schema = reader.GetSchemaTable();
RecordsAffected = reader.RecordsAffected;
Init(reader.FieldCount);
int i = 0;
for (i = 0; i < _fields; i++)
do
{
_names.Add(reader.GetName(i));
_types.Add(reader.GetFieldType(i));
Init(reader.FieldCount);
if (!_ordinals.ContainsKey(reader.GetName(i).ToUpper()))
_ordinals.Add(reader.GetName(i).ToUpper(), i);
}
var data = _data[_currentDataPosition];
int current = 0;
while (reader.Read())
{
if (current < offset)
data._schema = reader.GetSchemaTable();
data._rowsAffected = reader.RecordsAffected;
int i = 0;
for (i = 0; i < data._fields; i++)
{
current++;
continue;
data._names.Add(reader.GetName(i));
data._types.Add(reader.GetFieldType(i));
if (!data._ordinals.ContainsKey(reader.GetName(i).ToUpper()))
data._ordinals.Add(reader.GetName(i).ToUpper(), i);
}
for (i = 0; i < _fields; i++)
_cache.Add(reader[i]);
int current = 0;
while (reader.Read())
{
if (current < offset)
{
current++;
continue;
}
_rows++;
current++;
for (i = 0; i < data._fields; i++)
data._cache.Add(reader[i]);
if (limit >= 0 && _rows >= limit)
break;
data._rows++;
current++;
if (progress != null && !progress(this, _rows))
break;
}
if (limit >= 0 && data._rows >= limit)
break;
IsClosed = false;
_position = -1;
_cachePos = -1;
if (progress != null && !progress(this, data._rows))
break;
}
if (progress != null)
progress(this, _rows);
IsClosed = false;
data._position = -1;
data._cachePos = -1;
if (progress != null)
progress(this, data._rows);
} while (reader.NextResult());
reader.Close();
}
private void FillFromEnumerable<T>(IEnumerable<T> objects, DynamicTypeMap mapper)
{
var data = _data[_currentDataPosition];
foreach (var elem in objects)
{
foreach (var col in mapper.ColumnsMap)
@@ -240,17 +253,19 @@ namespace DynamORM
if (col.Value.Get != null)
val = col.Value.Get(elem);
_cache.Add(val);
data._cache.Add(val);
}
_cache.Add(elem);
data._cache.Add(elem);
_rows++;
data._rows++;
}
}
private void FillFromEnumerable(Type elementType, IEnumerable objects, DynamicTypeMap mapper)
{
var data = _data[_currentDataPosition];
foreach (var elem in objects)
{
foreach (var col in mapper.ColumnsMap)
@@ -260,37 +275,38 @@ namespace DynamORM
if (col.Value.Get != null)
val = col.Value.Get(elem);
_cache.Add(val);
data._cache.Add(val);
}
_cache.Add(elem);
data._cache.Add(elem);
_rows++;
data._rows++;
}
}
private void CreateSchemaTable(DynamicTypeMap mapper)
{
_schema = new DataTable("DYNAMIC");
_schema.Columns.Add(new DataColumn("ColumnName", typeof(string)));
_schema.Columns.Add(new DataColumn("ColumnOrdinal", typeof(int)));
_schema.Columns.Add(new DataColumn("ColumnSize", typeof(int)));
_schema.Columns.Add(new DataColumn("NumericPrecision", typeof(short)));
_schema.Columns.Add(new DataColumn("NumericScale", typeof(short)));
_schema.Columns.Add(new DataColumn("DataType", typeof(Type)));
_schema.Columns.Add(new DataColumn("ProviderType", typeof(int)));
_schema.Columns.Add(new DataColumn("NativeType", typeof(int)));
_schema.Columns.Add(new DataColumn("AllowDBNull", typeof(bool)));
_schema.Columns.Add(new DataColumn("IsUnique", typeof(bool)));
_schema.Columns.Add(new DataColumn("IsKey", typeof(bool)));
_schema.Columns.Add(new DataColumn("IsAutoIncrement", typeof(bool)));
var data = _data[_currentDataPosition];
data._schema = new DataTable("DYNAMIC");
data._schema.Columns.Add(new DataColumn("ColumnName", typeof(string)));
data._schema.Columns.Add(new DataColumn("ColumnOrdinal", typeof(int)));
data._schema.Columns.Add(new DataColumn("ColumnSize", typeof(int)));
data._schema.Columns.Add(new DataColumn("NumericPrecision", typeof(short)));
data._schema.Columns.Add(new DataColumn("NumericScale", typeof(short)));
data._schema.Columns.Add(new DataColumn("DataType", typeof(Type)));
data._schema.Columns.Add(new DataColumn("ProviderType", typeof(int)));
data._schema.Columns.Add(new DataColumn("NativeType", typeof(int)));
data._schema.Columns.Add(new DataColumn("AllowDBNull", typeof(bool)));
data._schema.Columns.Add(new DataColumn("IsUnique", typeof(bool)));
data._schema.Columns.Add(new DataColumn("IsKey", typeof(bool)));
data._schema.Columns.Add(new DataColumn("IsAutoIncrement", typeof(bool)));
int ordinal = 0;
DataRow dr = null;
foreach (var column in mapper.ColumnsMap)
{
dr = _schema.NewRow();
dr = data._schema.NewRow();
dr[0] = column.Value.Column.NullOr(x => x.Name ?? column.Value.Name, column.Value.Name);
dr[1] = ordinal;
@@ -305,16 +321,16 @@ namespace DynamORM
dr[10] = column.Value.Column.NullOr(x => x.IsKey, false);
dr[11] = false;
_schema.Rows.Add(dr);
data._schema.Rows.Add(dr);
_names.Add(dr[0].ToString());
_ordinals.Add(dr[0].ToString().ToUpper(), ordinal++);
_types.Add((Type)dr[5]);
data._names.Add(dr[0].ToString());
data._ordinals.Add(dr[0].ToString().ToUpper(), ordinal++);
data._types.Add((Type)dr[5]);
dr.AcceptChanges();
}
dr = _schema.NewRow();
dr = data._schema.NewRow();
dr[0] = "#O";
dr[1] = ordinal;
@@ -329,33 +345,38 @@ namespace DynamORM
dr[10] = false;
dr[11] = false;
_schema.Rows.Add(dr);
data._schema.Rows.Add(dr);
_names.Add("#O");
_ordinals.Add("#O".ToUpper(), ordinal++);
_types.Add(mapper.Type);
data._names.Add("#O");
data._ordinals.Add("#O".ToUpper(), ordinal++);
data._types.Add(mapper.Type);
dr.AcceptChanges();
}
private void Init(int fieldCount)
{
_rows = 0;
_fields = fieldCount;
_names = new List<string>(_fields);
_ordinals = new Dictionary<string, int>(_fields);
_types = new List<Type>(_fields);
_cache = new List<object>(_fields * 100);
_data.Add(new Data()
{
_rows = 0,
_fields = fieldCount,
_names = new List<string>(fieldCount),
_ordinals = new Dictionary<string, int>(fieldCount),
_types = new List<Type>(fieldCount),
_cache = new List<object>(fieldCount * 100),
});
_currentDataPosition = _data.Count - 1;
}
/// <summary>Sets the current position in reader.</summary>
/// <param name="pos">The position.</param>
public void SetPosition(int pos)
{
if (pos >= -1 && pos < _rows)
if (pos >= -1 && pos < _data[_currentDataPosition]._rows)
{
_position = pos;
_cachePos = _position * _fields;
_data[_currentDataPosition]._position = pos;
_data[_currentDataPosition]._cachePos = _data[_currentDataPosition]._position * _data[_currentDataPosition]._fields;
}
else
throw new IndexOutOfRangeException();
@@ -369,15 +390,14 @@ namespace DynamORM
public void Close()
{
IsClosed = true;
_position = _rows;
_cachePos = -1;
_currentDataPosition = -1;
}
/// <summary>Gets a value indicating the depth of nesting for the current row.</summary>
/// <remarks>This implementation use this field to indicate row count.</remarks>
public int Depth
{
get { return _rows; }
get { return _data[_currentDataPosition]._rows; }
}
/// <summary>Returns a System.Data.DataTable that describes the column metadata of the
@@ -386,7 +406,7 @@ namespace DynamORM
/// The System.Data.IDataReader is closed.</exception>
public DataTable GetSchemaTable()
{
return _schema;
return _data[_currentDataPosition]._schema;
}
/// <summary>Gets a value indicating whether the data reader is closed.</summary>
@@ -396,24 +416,26 @@ namespace DynamORM
/// <returns>Returns true if there are more rows; otherwise, false.</returns>
public bool NextResult()
{
_cachePos = (++_position) * _fields;
_currentDataPosition++;
return _position < _rows;
return _data.Count < _currentDataPosition;
}
/// <summary>Advances the System.Data.IDataReader to the next record.</summary>
/// <returns>Returns true if there are more rows; otherwise, false.</returns>
public bool Read()
{
_cachePos = (++_position) * _fields;
var data = _data[_currentDataPosition];
return _position < _rows;
data._cachePos = (++data._position) * data._fields;
return data._position < data._rows;
}
/// <summary>Gets the number of rows changed, inserted, or deleted by execution of the SQL statement.</summary>
/// <returns>The number of rows changed, inserted, or deleted; 0 if no rows were affected or the statement
/// failed; and -1 for SELECT statements.</returns>
public int RecordsAffected { get; private set; }
public int RecordsAffected { get { return _data[_currentDataPosition]._rowsAffected; } }
#endregion IDataReader Members
@@ -423,10 +445,15 @@ namespace DynamORM
/// freeing, releasing, or resetting unmanaged resources.</summary>
public void Dispose()
{
_names.Clear();
_types.Clear();
_cache.Clear();
_schema.Dispose();
foreach (var data in _data)
{
data._names.Clear();
data._types.Clear();
data._cache.Clear();
data._schema.Dispose();
}
_data.Clear();
}
#endregion IDisposable Members
@@ -435,14 +462,15 @@ namespace DynamORM
/// <summary>Gets the number of columns in the current row.</summary>
/// <remarks>When not positioned in a valid record set, 0; otherwise, the number of columns in the current record. The default is -1.</remarks>
public int FieldCount { get { return _fields; } }
public int FieldCount { get { return _data[_currentDataPosition]._fields; } }
/// <summary>Return the value of the specified field.</summary>
/// <param name="i">The index of the field to find.</param>
/// <returns>Field value upon return.</returns>
public bool GetBoolean(int i)
{
return (bool)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (bool)data._cache[data._cachePos + i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -450,7 +478,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public byte GetByte(int i)
{
return (byte)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (byte)data._cache[data._cachePos + i];
}
/// <summary>Reads a stream of bytes from the specified column offset into the buffer
@@ -463,7 +492,9 @@ namespace DynamORM
/// <returns>The actual number of bytes read.</returns>
public long GetBytes(int i, long fieldOffset, byte[] buffer, int bufferoffset, int length)
{
using (MemoryStream ms = new MemoryStream((byte[])_cache[_cachePos + i]))
var data = _data[_currentDataPosition];
using (MemoryStream ms = new MemoryStream((byte[])data._cache[data._cachePos + i]))
return ms.Read(buffer, bufferoffset, length);
}
@@ -472,7 +503,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public char GetChar(int i)
{
return (char)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (char)data._cache[data._cachePos + i];
}
/// <summary>Reads a stream of characters from the specified column offset into the buffer
@@ -485,7 +517,9 @@ namespace DynamORM
/// <returns>The actual number of characters read.</returns>
public long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, int length)
{
using (MemoryStream ms = new MemoryStream((byte[])_cache[_cachePos + i]))
var data = _data[_currentDataPosition];
using (MemoryStream ms = new MemoryStream((byte[])data._cache[data._cachePos + i]))
{
byte[] buff = new byte[buffer.Length];
long ret = ms.Read(buff, bufferoffset, length);
@@ -510,7 +544,7 @@ namespace DynamORM
/// <returns>The data type information for the specified field.</returns>
public string GetDataTypeName(int i)
{
return _types[i].Name;
return _data[_currentDataPosition]._types[i].Name;
}
/// <summary>Return the value of the specified field.</summary>
@@ -518,7 +552,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public DateTime GetDateTime(int i)
{
return (DateTime)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (DateTime)data._cache[data._cachePos + i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -526,7 +561,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public decimal GetDecimal(int i)
{
return (decimal)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (decimal)data._cache[data._cachePos + i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -534,7 +570,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public double GetDouble(int i)
{
return (double)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (double)data._cache[data._cachePos + i];
}
/// <summary>Gets the System.Type information corresponding to the type of System.Object
@@ -544,7 +581,7 @@ namespace DynamORM
/// would be returned from System.Data.IDataRecord.GetValue(System.Int32).</returns>
public Type GetFieldType(int i)
{
return _types[i];
return _data[_currentDataPosition]._types[i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -552,7 +589,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public float GetFloat(int i)
{
return (float)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (float)data._cache[data._cachePos + i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -560,7 +598,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public Guid GetGuid(int i)
{
return (Guid)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (Guid)data._cache[data._cachePos + i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -568,7 +607,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public short GetInt16(int i)
{
return (short)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (short)data._cache[data._cachePos + i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -576,7 +616,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public int GetInt32(int i)
{
return (int)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (int)data._cache[data._cachePos + i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -584,7 +625,8 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public long GetInt64(int i)
{
return (long)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (long)data._cache[data._cachePos + i];
}
/// <summary>Gets the name for the field to find.</summary>
@@ -592,7 +634,7 @@ namespace DynamORM
/// <returns>The name of the field or the empty string (""), if there is no value to return.</returns>
public string GetName(int i)
{
return _names[i];
return _data[_currentDataPosition]._names[i];
}
/// <summary>Return the index of the named field.</summary>
@@ -600,8 +642,10 @@ namespace DynamORM
/// <returns>The index of the named field.</returns>
public int GetOrdinal(string name)
{
if (_ordinals.ContainsKey(name.ToUpper()))
return _ordinals[name.ToUpper()];
var data = _data[_currentDataPosition];
if (data._ordinals.ContainsKey(name.ToUpper()))
return data._ordinals[name.ToUpper()];
return -1;
}
@@ -611,7 +655,9 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public string GetString(int i)
{
return (string)_cache[_cachePos + i];
var data = _data[_currentDataPosition];
return (string)data._cache[data._cachePos + i];
}
/// <summary>Return the value of the specified field.</summary>
@@ -619,7 +665,9 @@ namespace DynamORM
/// <returns>Field value upon return.</returns>
public object GetValue(int i)
{
return _cache[_cachePos + i];
var data = _data[_currentDataPosition];
return data._cache[data._cachePos + i];
}
/// <summary>Gets all the attribute fields in the collection for the current record.</summary>
@@ -627,10 +675,12 @@ namespace DynamORM
/// <returns>The number of instances of System.Object in the array.</returns>
public int GetValues(object[] values)
{
for (int i = 0; i < _fields; i++)
values[i] = _cache[_cachePos + i];
var data = _data[_currentDataPosition];
return _fields;
for (int i = 0; i < data._fields; i++)
values[i] = data._cache[data._cachePos + i];
return data._fields;
}
/// <summary>Return whether the specified field is set to null.</summary>
@@ -638,7 +688,8 @@ namespace DynamORM
/// <returns>Returns true if the specified field is set to null; otherwise, false.</returns>
public bool IsDBNull(int i)
{
return _cache[_cachePos + i] == null || _cache[_cachePos + i] == DBNull.Value;
var data = _data[_currentDataPosition];
return data._cache[data._cachePos + i] == null || data._cache[data._cachePos + i] == DBNull.Value;
}
/// <summary>Gets or sets specified value in current record.</summary>
@@ -648,8 +699,10 @@ namespace DynamORM
{
get
{
if (_ordinals.ContainsKey(name.ToUpper()))
return _cache[_cachePos + _ordinals[name.ToUpper()]];
var data = _data[_currentDataPosition];
if (data._ordinals.ContainsKey(name.ToUpper()))
return data._cache[data._cachePos + data._ordinals[name.ToUpper()]];
throw new IndexOutOfRangeException(String.Format("Field '{0}' not found.", name));
}
@@ -660,7 +713,10 @@ namespace DynamORM
/// <returns>Value of specified column.</returns>
public object this[int i]
{
get { return _cache[_cachePos + i]; }
get {
var data = _data[_currentDataPosition];
return data._cache[data._cachePos + i];
}
}
#endregion IDataRecord Members