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392 lines (304 loc) · 10.1 KB
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using DuckDB.NET.Data.DataChunk.Reader;
using System.IO;
using System.Runtime.CompilerServices;
namespace DuckDB.NET.Data;
public class DuckDBDataReader : DbDataReader
{
private readonly DuckDBCommand command;
private readonly CommandBehavior behavior;
private DuckDBResult currentResult;
private DuckDBDataChunk? currentChunk;
private int fieldCount;
private ulong currentChunkRowCount;
private ulong rowsReadFromCurrentChunk;
private bool closed;
private bool hasRows;
private bool streamingResult;
private long currentChunkIndex;
private readonly IEnumerator<DuckDBResult> resultEnumerator;
private VectorDataReaderBase[] vectorReaders = [];
private Dictionary<string, int> columnMapping = [];
internal DuckDBDataReader(DuckDBCommand command, IEnumerable<DuckDBResult> queryResults, CommandBehavior behavior)
{
this.command = command;
this.behavior = behavior;
resultEnumerator = queryResults.GetEnumerator();
InitNextReader();
}
private bool InitNextReader()
{
while (resultEnumerator.MoveNext())
{
var result = resultEnumerator.Current;
if (NativeMethods.Query.DuckDBResultReturnType(result) == DuckDBResultType.QueryResult)
{
foreach (var reader in vectorReaders)
{
reader?.Dispose();
}
vectorReaders = [];
currentChunkIndex = 0;
currentResult = result;
columnMapping = [];
fieldCount = (int)NativeMethods.Query.DuckDBColumnCount(ref currentResult);
streamingResult = NativeMethods.Types.DuckDBResultIsStreaming(currentResult) > 0;
hasRows = InitChunkData();
return true;
}
result.Close();
}
return false;
}
private bool InitChunkData()
{
var canReuse = vectorReaders.Length > 0;
currentChunk?.Dispose();
currentChunk = streamingResult ? NativeMethods.StreamingResult.DuckDBStreamFetchChunk(currentResult) : NativeMethods.Types.DuckDBResultGetChunk(currentResult, currentChunkIndex);
rowsReadFromCurrentChunk = 0;
currentChunkRowCount = NativeMethods.DataChunks.DuckDBDataChunkGetSize(currentChunk);
if (!canReuse)
{
vectorReaders = new VectorDataReaderBase[fieldCount];
}
for (int index = 0; index < fieldCount; index++)
{
var vector = NativeMethods.DataChunks.DuckDBDataChunkGetVector(currentChunk, index);
if (canReuse)
{
vectorReaders[index].Reset(vector);
}
else
{
using var logicalType = NativeMethods.Query.DuckDBColumnLogicalType(ref currentResult, index);
var columnName = NativeMethods.Query.DuckDBColumnName(ref currentResult, index);
vectorReaders[index] = VectorDataReaderFactory.CreateReader(vector, logicalType, columnName);
}
}
if (columnMapping.Count == 0)
{
for (var i = 0; i < vectorReaders.Length; i++)
{
columnMapping.TryAdd(vectorReaders[i].ColumnName, i);
}
}
return currentChunkRowCount > 0;
}
public override bool GetBoolean(int ordinal)
{
return GetFieldValue<bool>(ordinal);
}
public override byte GetByte(int ordinal)
{
return GetFieldValue<byte>(ordinal);
}
public override long GetBytes(int ordinal, long dataOffset, byte[]? buffer, int bufferOffset, int length)
{
throw new NotImplementedException();
}
public override char GetChar(int ordinal)
{
throw new NotSupportedException();
}
public override long GetChars(int ordinal, long dataOffset, char[]? buffer, int bufferOffset, int length)
{
throw new NotSupportedException();
}
public override string GetDataTypeName(int ordinal)
{
return vectorReaders[ordinal].DuckDBType.ToString();
}
public override DateTime GetDateTime(int ordinal)
{
return GetFieldValue<DateTime>(ordinal);
}
public override decimal GetDecimal(int ordinal)
{
return GetFieldValue<decimal>(ordinal);
}
public override double GetDouble(int ordinal)
{
return GetFieldValue<double>(ordinal);
}
public override Type GetFieldType(int ordinal)
{
return vectorReaders[ordinal].ClrType;
}
public override Type GetProviderSpecificFieldType(int ordinal)
{
return vectorReaders[ordinal].ProviderSpecificClrType;
}
public override float GetFloat(int ordinal)
{
return GetFieldValue<float>(ordinal);
}
public override Guid GetGuid(int ordinal)
{
return GetFieldValue<Guid>(ordinal);
}
public override short GetInt16(int ordinal)
{
return GetFieldValue<short>(ordinal);
}
public override int GetInt32(int ordinal)
{
return GetFieldValue<int>(ordinal);
}
public override long GetInt64(int ordinal)
{
return GetFieldValue<long>(ordinal);
}
public override string GetName(int ordinal)
{
return vectorReaders[ordinal].ColumnName;
}
public override int GetOrdinal(string name)
{
if (columnMapping.TryGetValue(name, out var index))
{
return index;
}
throw new DuckDBException($"Column with name {name} was not found.");
}
public override string GetString(int ordinal)
{
return GetFieldValue<string>(ordinal);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override T GetFieldValue<T>(int ordinal)
{
CheckRowRead();
return vectorReaders[ordinal].GetValueStrict<T>(rowsReadFromCurrentChunk - 1);
}
public override object GetValue(int ordinal)
{
CheckRowRead();
var offset = rowsReadFromCurrentChunk - 1;
var reader = vectorReaders[ordinal];
return reader.IsValid(offset) ? reader.GetValue(offset) : DBNull.Value;
}
public override object GetProviderSpecificValue(int ordinal)
{
CheckRowRead();
var offset = rowsReadFromCurrentChunk - 1;
var reader = vectorReaders[ordinal];
return reader.IsValid(offset) ? reader.GetProviderSpecificValue(offset) : DBNull.Value;
}
public override int GetValues(object[] values)
{
CheckRowRead();
var offset = rowsReadFromCurrentChunk - 1;
for (var i = 0; i < FieldCount; i++)
{
var reader = vectorReaders[i];
values[i] = reader.IsValid(offset) ? reader.GetValue(offset) : DBNull.Value;
}
return FieldCount;
}
public override Stream GetStream(int ordinal)
{
return GetFieldValue<Stream>(ordinal);
}
public override bool IsDBNull(int ordinal)
{
CheckRowRead();
return !vectorReaders[ordinal].IsValid(rowsReadFromCurrentChunk - 1);
}
public override int FieldCount => fieldCount;
public override object this[int ordinal] => GetValue(ordinal);
public override object this[string name] => GetValue(GetOrdinal(name));
public override int RecordsAffected => -1;
public override bool HasRows => hasRows;
public override bool IsClosed => closed;
public override bool NextResult()
{
return InitNextReader();
}
public override bool Read()
{
if (rowsReadFromCurrentChunk == currentChunkRowCount)
{
currentChunkIndex++;
var hasData = InitChunkData();
if (hasData)
{
rowsReadFromCurrentChunk++;
}
return hasData;
}
else
{
rowsReadFromCurrentChunk++;
return true;
}
}
public override int Depth { get; }
public override IEnumerator GetEnumerator()
{
return new DbEnumerator(this, behavior == CommandBehavior.CloseConnection);
}
public override DataTable GetSchemaTable()
{
var table = new DataTable
{
Columns =
{
{ SchemaTableColumn.ColumnName, typeof(string) },
{ SchemaTableColumn.ColumnOrdinal, typeof(int) },
{ SchemaTableColumn.ColumnSize, typeof(int) },
{ SchemaTableColumn.NumericPrecision, typeof(byte)},
{ SchemaTableColumn.NumericScale, typeof(byte) },
{ SchemaTableColumn.DataType, typeof(Type) },
{ SchemaTableColumn.AllowDBNull, typeof(bool) }
}
};
var rowData = new object[7];
for (var i = 0; i < FieldCount; i++)
{
rowData[0] = GetName(i);
rowData[1] = i;
rowData[2] = -1;
rowData[5] = GetFieldType(i);
rowData[6] = true;
if (vectorReaders[i] is DecimalVectorDataReader decimalVectorDataReader)
{
rowData[4] = decimalVectorDataReader.Scale;
rowData[3] = decimalVectorDataReader.Precision;
}
else
{
rowData[3] = rowData[4] = DBNull.Value;
}
table.Rows.Add(rowData);
}
return table;
}
public override void Close()
{
if (closed) return;
foreach (var reader in vectorReaders)
{
reader.Dispose();
}
currentChunk?.Dispose();
currentResult.Close();
if (behavior == CommandBehavior.CloseConnection)
{
command.CloseConnection();
}
closed = true;
resultEnumerator.Dispose();
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private void CheckRowRead()
{
if (rowsReadFromCurrentChunk <= 0)
{
ThrowNoRowRead();
}
}
[MethodImpl(MethodImplOptions.NoInlining)]
private static void ThrowNoRowRead()
{
throw new InvalidOperationException("No row has been read");
}
}