public T ReMapOnException(IDataContext context, IQueryRunner queryRunner, DbDataReader dataReader, ref ReaderMapperInfo mapperInfo, Exception ex)
{
if (context.GetTraceSwitch().TraceInfo)
{
context.WriteTraceLine(
$"Mapper has switched to slow mode. Mapping exception: {ex.Message}",
context.GetTraceSwitch().DisplayName,
TraceLevel.Error);
}
queryRunner.MapperExpression = mapperInfo.MapperExpression;
var dataReaderType = dataReader.GetType();
var expression = TransformMapperExpression(context, dataReader, dataReaderType, true);
var expr = mapperInfo.MapperExpression; // create new instance to avoid race conditions without locks
mapperInfo = new ReaderMapperInfo()
{
MapperExpression = expr,
Mapper = expression.CompileExpression(),
IsFaulted = true
};
_mappers[dataReaderType] = mapperInfo;
return(mapperInfo.Mapper(queryRunner, dataReader));
}
public T Map(IDataContext context, IQueryRunner queryRunner, IDataReader dataReader)
{
var dataReaderType = dataReader.GetType();
if (!_mappers.TryGetValue(dataReaderType, out var mapperInfo))
{
var mapperExpression = TransformMapperExpression(context, dataReader, dataReaderType, false);
var qr = QueryRunner;
if (qr != null)
{
qr.MapperExpression = mapperExpression;
}
var mapper = mapperExpression.Compile();
mapperInfo = new ReaderMapperInfo()
{
MapperExpression = mapperExpression, Mapper = mapper
};
_mappers.TryAdd(dataReaderType, mapperInfo);
}
try
{
return(mapperInfo.Mapper(queryRunner, dataReader));
}
// SqlNullValueException: MySqlData
// OracleNullValueException: managed and native oracle providers
catch (Exception ex) when(ex is FormatException || ex is InvalidCastException || ex is LinqToDBConvertException || ex.GetType().Name.Contains("NullValueException"))
{
// TODO: debug cases when our tests go into slow-mode (e.g. sqlite.ms)
if (mapperInfo.IsFaulted)
{
throw;
}
if (context.GetTraceSwitch().TraceInfo)
{
context.WriteTraceLine(
$"Mapper has switched to slow mode. Mapping exception: {ex.Message}",
context.GetTraceSwitch().DisplayName,
TraceLevel.Error);
}
var qr = QueryRunner;
if (qr != null)
{
qr.MapperExpression = mapperInfo.MapperExpression;
}
var expression = TransformMapperExpression(context, dataReader, dataReaderType, true);
mapperInfo.Mapper = expression.Compile();
mapperInfo.IsFaulted = true;
return(mapperInfo.Mapper(queryRunner, dataReader));
}
}
public T Map(IDataContext context, IQueryRunner queryRunner, DbDataReader dataReader, ref ReaderMapperInfo mapperInfo)
{
try
{
return(mapperInfo.Mapper(queryRunner, dataReader));
}
// SqlNullValueException: MySqlData
// OracleNullValueException: managed and native oracle providers
catch (Exception ex) when(ex is FormatException or InvalidCastException or LinqToDBConvertException || ex.GetType().Name.Contains("NullValueException"))
{
// TODO: debug cases when our tests go into slow-mode (e.g. sqlite.ms)
if (mapperInfo.IsFaulted)
{
throw;
}
return(ReMapOnException(context, queryRunner, dataReader, ref mapperInfo, ex));
}
}
public T Map(IDataContext context, IQueryRunner queryRunner, IDataReader dataReader)
{
// unwrap early
// https://github.com/linq2db/linq2db/issues/2499
dataReader = DataReaderWrapCache.TryUnwrapDataReader(context.MappingSchema, dataReader);
var dataReaderType = dataReader.GetType();
if (!_mappers.TryGetValue(dataReaderType, out var mapperInfo))
{
var mapperExpression = TransformMapperExpression(context, dataReader, dataReaderType, false);
queryRunner.MapperExpression = mapperExpression;
var mapper = mapperExpression.CompileExpression();
mapperInfo = new ReaderMapperInfo()
{
MapperExpression = mapperExpression, Mapper = mapper
};
_mappers.TryAdd(dataReaderType, mapperInfo);
}
try
{
return(mapperInfo.Mapper(queryRunner, dataReader));
}
// SqlNullValueException: MySqlData
// OracleNullValueException: managed and native oracle providers
catch (Exception ex) when(ex is FormatException || ex is InvalidCastException || ex is LinqToDBConvertException || ex.GetType().Name.Contains("NullValueException"))
{
// TODO: debug cases when our tests go into slow-mode (e.g. sqlite.ms)
if (mapperInfo.IsFaulted)
{
throw;
}
if (context.GetTraceSwitch().TraceInfo)
{
context.WriteTraceLine(
$"Mapper has switched to slow mode. Mapping exception: {ex.Message}",
context.GetTraceSwitch().DisplayName,
TraceLevel.Error);
}
queryRunner.MapperExpression = mapperInfo.MapperExpression;
var expression = TransformMapperExpression(context, dataReader, dataReaderType, true);
// create new instance to avoid race conditions without locks
var expr = mapperInfo.MapperExpression;
mapperInfo = new ReaderMapperInfo()
{
MapperExpression = expr,
Mapper = expression.CompileExpression(),
IsFaulted = true
};
_mappers[dataReaderType] = mapperInfo;
return(mapperInfo.Mapper(queryRunner, dataReader));
}
}
public T Map(IDataContext context, IQueryRunner queryRunner, IDataReader dataReader)
{
var dataReaderType = dataReader.GetType();
ParameterExpression?oldVariable;
ParameterExpression?newVariable;
LambdaExpression? converterExpr;
Type variableType;
if (!_mappers.TryGetValue(dataReaderType, out var mapperInfo))
{
converterExpr = context.MappingSchema.GetConvertExpression(dataReaderType, typeof(IDataReader), false, false);
variableType = converterExpr != null ? context.DataReaderType : dataReaderType;
oldVariable = null;
newVariable = null;
var mapperExpression = (Expression <Func <IQueryRunner, IDataReader, T> >)_expression.Transform(
e => {
if (e is ConvertFromDataReaderExpression ex)
{
return(ex.Reduce(context, dataReader, newVariable !).Transform(replaceVariable));
}
return(replaceVariable(e));
});
var qr = QueryRunner;
if (qr != null)
{
qr.MapperExpression = mapperExpression;
}
var mapper = mapperExpression.Compile();
mapperInfo = new ReaderMapperInfo()
{
MapperExpression = mapperExpression, Mapper = mapper
};
_mappers.TryAdd(dataReaderType, mapperInfo);
}
try
{
return(mapperInfo.Mapper(queryRunner, dataReader));
}
catch (Exception ex) when(ex is FormatException || ex is InvalidCastException || ex is LinqToDBConvertException)
{
// TODO: debug cases when our tests go into slow-mode (e.g. sqlite.ms)
if (mapperInfo.IsFaulted)
{
throw;
}
if (context.GetTraceSwitch().TraceInfo)
{
context.WriteTraceLine(
$"Mapper has switched to slow mode. Mapping exception: {ex.Message}",
context.GetTraceSwitch().DisplayName,
TraceLevel.Error);
}
var qr = QueryRunner;
if (qr != null)
{
qr.MapperExpression = mapperInfo.MapperExpression;
}
converterExpr = context.MappingSchema.GetConvertExpression(dataReaderType, typeof(IDataReader), false, false);
variableType = converterExpr != null ? context.DataReaderType : dataReaderType;
oldVariable = null;
newVariable = null;
var expression = (Expression <Func <IQueryRunner, IDataReader, T> >)_expression.Transform(e => {
if (e is ConvertFromDataReaderExpression ex)
{
return(new ConvertFromDataReaderExpression(ex.Type, ex.Index, newVariable !, context));
}
return(replaceVariable(e));
});
mapperInfo.Mapper = expression.Compile();
mapperInfo.IsFaulted = true;
return(mapperInfo.Mapper(queryRunner, dataReader));
}
Expression replaceVariable(Expression e)
{
if (e is ParameterExpression vex && vex.Name == "ldr")
{
oldVariable = vex;
return(newVariable ?? (newVariable = Expression.Variable(variableType, "ldr")));
}
if (e is BinaryExpression bex &&
bex.NodeType == ExpressionType.Assign &&
bex.Left == oldVariable)
{
Expression dataReaderExpression = Expression.Convert(_expression.Parameters[1], dataReaderType);
if (converterExpr != null)
{
dataReaderExpression = Expression.Convert(converterExpr.GetBody(dataReaderExpression), variableType);
}
return(Expression.Assign(newVariable, dataReaderExpression));
}
return(e);
}
}
