private IExecuteResult Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, object[] parentArgs, object[] userArgs, ICompiledSubQuery[] subQueries, object lastResult)
{
this.InitializeProviderMode();
DbConnection con = _conManager.UseConnection(this);
try
{
DbCommand cmd = con.CreateCommand();
cmd.CommandText = queryInfo.CommandText;
cmd.Transaction = _conManager.Transaction;
cmd.CommandTimeout = _commandTimeout;
AssignParameters(cmd, queryInfo.Parameters, userArgs, lastResult);
LogCommand(_log, cmd);
_queryCount += 1;
switch(queryInfo.ResultShape)
{
default:
case ResultShape.Return:
{
return new ExecuteResult(cmd, queryInfo.Parameters, null, cmd.ExecuteNonQuery(), true);
}
case ResultShape.Singleton:
{
DbDataReader reader = cmd.ExecuteReader();
IObjectReader objReader = factory.Create(reader, true, this, parentArgs, userArgs, subQueries);
_conManager.UseConnection(objReader.Session);
try
{
IEnumerable sequence = (IEnumerable)Activator.CreateInstance(
typeof(OneTimeEnumerable<>).MakeGenericType(queryInfo.ResultType),
BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null,
new object[] { objReader }, null
);
object value = null;
MethodCallExpression mce = query as MethodCallExpression;
MethodInfo sequenceMethod = null;
if(mce != null && (
mce.Method.DeclaringType == typeof(Queryable) ||
mce.Method.DeclaringType == typeof(Enumerable))
)
{
switch(mce.Method.Name)
{
case "First":
case "FirstOrDefault":
case "SingleOrDefault":
sequenceMethod = TypeSystem.FindSequenceMethod(mce.Method.Name, sequence);
break;
case "Single":
default:
sequenceMethod = TypeSystem.FindSequenceMethod("Single", sequence);
break;
}
}
else
{
sequenceMethod = TypeSystem.FindSequenceMethod("SingleOrDefault", sequence);
}
// When dynamically invoking the sequence method, we want to
// return the inner exception if the invocation fails
if(sequenceMethod != null)
{
try
{
value = sequenceMethod.Invoke(null, new object[] { sequence });
}
catch(TargetInvocationException tie)
{
if(tie.InnerException != null)
{
throw tie.InnerException;
}
throw;
}
}
return new ExecuteResult(cmd, queryInfo.Parameters, objReader.Session, value);
}
finally
{
objReader.Dispose();
}
}
case ResultShape.Sequence:
{
DbDataReader reader = cmd.ExecuteReader();
IObjectReader objReader = factory.Create(reader, true, this, parentArgs, userArgs, subQueries);
_conManager.UseConnection(objReader.Session);
IEnumerable sequence = (IEnumerable)Activator.CreateInstance(
typeof(OneTimeEnumerable<>).MakeGenericType(TypeSystem.GetElementType(queryInfo.ResultType)),
BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null,
new object[] { objReader }, null
);
if(typeof(IQueryable).IsAssignableFrom(queryInfo.ResultType))
{
sequence = sequence.AsQueryable();
}
ExecuteResult result = new ExecuteResult(cmd, queryInfo.Parameters, objReader.Session);
MetaFunction function = this.GetFunction(query);
if(function != null && !function.IsComposable)
{
sequence = (IEnumerable)Activator.CreateInstance(
typeof(SingleResult<>).MakeGenericType(TypeSystem.GetElementType(queryInfo.ResultType)),
BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null,
new object[] { sequence, result, _services.Context }, null
);
}
result.ReturnValue = sequence;
return result;
}
case ResultShape.MultipleResults:
{
DbDataReader reader = cmd.ExecuteReader();
IObjectReaderSession session = _readerCompiler.CreateSession(reader, this, parentArgs, userArgs, subQueries);
_conManager.UseConnection(session);
MetaFunction function = this.GetFunction(query);
ExecuteResult result = new ExecuteResult(cmd, queryInfo.Parameters, session);
result.ReturnValue = new MultipleResults(this, function, session, result);
return result;
}
}
}
finally
{
_conManager.ReleaseConnection(this);
}
}
