protected internal override void DecodeBody(ref SequenceReader <byte> reader, object context)
{
TableID = reader.ReadLong(6);
reader.TryReadLittleEndian(out short flags);
RowsEventFlags = (RowsEventFlags)flags;
reader.TryReadLittleEndian(out short extraDataLen);
reader.Advance(extraDataLen - 2);
ReadIncludedColumns(ref reader);
TableMapEvent tableMap = null;
if (context is ReplicationState repState)
{
if (repState.TableMap.TryGetValue(TableID, out tableMap))
{
TableMap = tableMap;
}
}
if (tableMap == null)
{
throw new Exception($"The table's metadata was not found: {TableID}.");
}
var columnCount = GetIncludedColumnCount(IncludedColumns);
RebuildReaderAsCRC(ref reader);
ReadData(ref reader, IncludedColumns, tableMap, columnCount);
}
protected internal override void DecodeBody(ref SequenceReader <byte> reader, object context)
{
TableID = reader.ReadLong(6);
reader.TryReadLittleEndian(out short flags);
reader.TryReadLittleEndian(out short extraDataLen);
reader.Advance(extraDataLen);
IncludedColumnsBeforeUpdate = reader.ReadBitArray((int)reader.ReadLengthEncodedInteger());
IncludedColumns = reader.ReadBitArray((int)reader.ReadLengthEncodedInteger());
TableMapEvent tableMap = null;
if (context is ReplicationState repState)
{
repState.TableMap.TryGetValue(TableID, out tableMap);
}
if (tableMap == null)
{
throw new Exception($"The table's metadata was not found: {TableID}.");
}
Rows = ReadUpdatedRows(ref reader, tableMap, IncludedColumnsBeforeUpdate, IncludedColumns);
}
private RowSet ReadUpdatedRows(ref SequenceReader <byte> reader, TableMapEvent tableMap, BitArray includedColumnsBeforeUpdate, BitArray includedColumns, int columnCount)
{
var columnCountBeforeUpdate = GetIncludedColumnCount(IncludedColumnsBeforeUpdate);
var rows = new List <object[]>();
var columns = GetColumnNames(tableMap, includedColumnsBeforeUpdate, columnCount);
while (reader.Remaining > 0)
{
var oldCellValues = ReadRow(ref reader, tableMap, includedColumnsBeforeUpdate, columnCountBeforeUpdate);
var newCellValues = ReadRow(ref reader, tableMap, includedColumnsBeforeUpdate, columnCount);
var cellCount = Math.Min(oldCellValues.Length, newCellValues.Length);
var cells = new object[cellCount];
for (var i = 0; i < cellCount; i++)
{
cells[i] = new CellValue
{
OldValue = oldCellValues[i],
NewValue = newCellValues[i]
};
}
rows.Add(cells);
}
return(new RowSet
{
ColumnNames = columns,
Rows = rows
});
}
protected List <object[]> ReadRows(ref SequenceReader <byte> reader, TableMapEvent table, BitArray includedColumns, int columnCount)
{
var rows = new List <object[]>();
while (reader.Remaining > 0)
{
rows.Add(ReadRow(ref reader, table, includedColumns, columnCount));
}
return(rows);
}
protected RowSet ReadRows(ref SequenceReader <byte> reader, TableMapEvent table, BitArray includedColumns, int columnCount)
{
var rows = new List <object[]>();
var columns = GetColumnNames(table, includedColumns, columnCount);
while (reader.Remaining > 0)
{
rows.Add(ReadRow(ref reader, table, includedColumns, columnCount));
}
return(new RowSet
{
Rows = rows,
ColumnNames = columns
});
}
protected IReadOnlyList <string> GetColumnNames(TableMapEvent table, BitArray includedColumns, int columnCount)
{
var columns = new List <string>(columnCount);
var columnNames = table.Metadata.ColumnNames;
if (columnNames != null && columnNames.Count > 0)
{
for (var i = 0; i < includedColumns.Count; i++)
{
if (!includedColumns.Get(i))
{
continue;
}
columns.Add(columnNames[i]);
}
}
return(columns);
}
protected object[] ReadRow(ref SequenceReader <byte> reader, TableMapEvent table, BitArray includedColumns, int columnCount)
{
var cells = new object[columnCount];
var nullColumns = reader.ReadBitArray(columnCount, true);
var columnTypes = table.ColumnTypes;
var columnMetadata = table.ColumnMetadata;
for (int i = 0, numberOfSkippedColumns = 0; i < columnTypes.Length; i++)
{
if (!includedColumns.Get(i))
{
numberOfSkippedColumns++;
continue;
}
int index = i - numberOfSkippedColumns;
if (nullColumns.Get(index))
{
continue;
}
var typeCode = columnTypes[i];
var meta = columnMetadata[i];
var length = 0;
var columnType = (ColumnType)typeCode;
if (columnType == ColumnType.STRING)
{
if (meta >= 256)
{
int meta0 = meta >> 8, meta1 = meta & 0xFF;
if ((meta0 & 0x30) != 0x30)
{
typeCode = (byte)(meta0 | 0x30);
columnType = (ColumnType)typeCode;
length = meta1 | (((meta0 & 0x30) ^ 0x30) << 4);
}
else
{
// mysql-5.6.24 sql/rpl_utility.h enum_field_types (line 278)
if (meta0 == (int)ColumnType.ENUM || meta0 == (int)ColumnType.SET)
{
typeCode = (byte)meta0;
columnType = (ColumnType)typeCode;
}
length = meta1;
}
}
else
{
length = meta;
}
}
cells[index] = ReadCell(ref reader, columnType, meta, length);
}
return(cells);
}
protected virtual void ReadData(ref SequenceReader <byte> reader, BitArray includedColumns, TableMapEvent tableMap, int columnCount)
{
RowSet = ReadRows(ref reader, tableMap, IncludedColumns, columnCount);
}
private List <Tuple <object[], object[]> > ReadUpdatedRows(ref SequenceReader <byte> reader, TableMapEvent tableMap, BitArray includedColumnsBeforeUpdate, BitArray includedColumns)
{
var columnCountBeforeUpdate = GetIncludedColumnCount(IncludedColumnsBeforeUpdate);
var columnCount = GetIncludedColumnCount(IncludedColumns);
var rows = new List <Tuple <object[], object[]> >();
while (reader.Remaining > 0)
{
rows.Add(Tuple.Create(
ReadRow(ref reader, tableMap, includedColumnsBeforeUpdate, columnCountBeforeUpdate),
ReadRow(ref reader, tableMap, includedColumns, columnCount))
);
}
return(rows);
}
protected override void ReadData(ref SequenceReader <byte> reader, BitArray includedColumns, TableMapEvent tableMap, int columnCount)
{
RowSet = ReadUpdatedRows(ref reader, tableMap, IncludedColumnsBeforeUpdate, includedColumns, columnCount);
}
