protected override Expression VisitConstant(ConstantExpression node)
{
if (node.Type.IsGenericType && (node.Type.GetGenericTypeDefinition() == typeof(IEnumerable <>) || node.Type.GetGenericTypeDefinition() == typeof(IQueryable <>)))
{
Db.OeEntitySetAdapter entitySetAdapter = _entitySetAdapters.FindByClrType(node.Type.GetGenericArguments()[0]);
IQueryable query = entitySetAdapter.GetEntitySet(_dataContext);
return(Expression.Constant(query));
}
return(base.VisitConstant(node));
}
protected override Db.OeAsyncEnumerator ExecuteReader(Object dataContext, String sql, IReadOnlyList <KeyValuePair <String, Object> > parameters, Type returnType)
{
var fromSql = (IFromSql)_entitySetAdapters.FindByClrType(returnType);
if (fromSql == null)
{
throw new NotSupportedException("supported only Entity type");
}
var query = (IQueryable <Object>)fromSql.FromSql((DbContext)dataContext, sql, GetParameterValues(parameters));
return(new Db.OeAsyncEnumeratorAdapter(query, CancellationToken.None));
}
private ConstantExpression GetQueryConstantExpression(Expression node)
{
if (node.Type.IsGenericType && node.Type.GetGenericTypeDefinition() == typeof(IQueryable <>))
{
Db.OeEntitySetAdapter entitySetAdapter = _entitySetAdapters.FindByClrType(node.Type.GetGenericArguments()[0]);
IQueryable query = entitySetAdapter.GetEntitySet(_dataContext);
if (_query == null && entitySetAdapter.EntityType == typeof(T))
{
_query = (IQueryable <T>)query;
}
return(Expression.Constant(query));
}
return(null);
}