/// <param name="predicate">The lambda expression parameter to the Select extension method</param>
private void VisitSelect(LambdaExpression predicate)
{
if (_selectTranslator != null)
{
throw new NotSupportedException("You cannot have more than 1 Select in the expression");
}
_selectTranslator = new ProjectionTranslator();
_selectTranslator.Translate(predicate);
}
/// <summary>
/// Converte a expressão da consulta com uma consulta executável.
/// </summary>
/// <param name="query"></param>
/// <returns></returns>
private QueryInfo ConvertToExecutableQuery(Expression query)
{
Type source;
if (!GetSourceEntity(query, out source))
{
throw new NotSupportedException("This query expression is not supported!");
}
var queryDetails = new QueryInfo()
{
Method = _useMethod
};
if (_takeTranslator != null)
{
queryDetails.TakeParameters = new TakeParameters(_takeTranslator.Count.GetValueOrDefault(), _skipTranslator != null ? _skipTranslator.Skip.GetValueOrDefault() : 0);
}
if (_selectTranslator == null || !_selectTranslator.DataMembers.Any())
{
_selectTranslator = new ProjectionTranslator(source.GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance).Select(f => new Member(null, f)));
}
if (!_selectTranslator.DataMembers.Any())
{
throw new Exception("There are no items for projection in this query!");
}
var projection = new Projection();
foreach (var i in _selectTranslator.DataMembers)
{
projection.Add(new ProjectionEntry(!string.IsNullOrEmpty(i.Owner) ? string.Format("{0}.{1}", i.Owner, i.Info.Name) : i.Info.Name, i.Info.Name));
}
queryDetails.Projection = projection;
IEnumerable <Member> entities = _selectTranslator.DataMembers;
if (_whereTranslator != null)
{
string where = _whereTranslator.WhereClause;
if (!string.IsNullOrEmpty(where))
{
queryDetails.WhereClause = ConditionalContainer.Parse(where);
}
}
else
{
queryDetails.WhereClause = new ConditionalContainer().Add(_parameters);
}
var rr = entities.GroupBy(f => f.Owner, f => f).ToArray();
if (_orderByTranslator != null && _orderByTranslator.Members.Any())
{
foreach (var i in _orderByTranslator.Members)
{
if (queryDetails.Sort == null)
{
queryDetails.Sort = new Sort();
}
queryDetails.Sort.Add(new SortEntry(new Column(i.DataMember.Name), i.Direction == OrderDirection.Descending));
}
}
return(queryDetails);
}
