public static OrQuery Select <T>(Expression <Func <T, object> > selector, bool distinct = false, string collectionName = null)
{
var schema = TypeDescriptionsCache.GetDescription(typeof(T));
collectionName ??= schema.CollectionName;
// create a fake queryable to force query parsing and capture resolution
var executor = new NullExecutor(schema, collectionName);
var queryable = new NullQueryable <T>(executor);
if (!distinct)
{
var unused = queryable.Select(selector).ToList();
}
else
{
var unused = queryable.Select(selector).Distinct().ToList();
}
var query = executor.Expression;
query.CollectionName = typeof(T).Name;
return(query);
}
public static OrQuery OrderBy <T, R>(Expression <Func <T, R> > selector, bool descending = false, string collectionName = null)
{
var schema = TypeDescriptionsCache.GetDescription(typeof(T));
// create a fake queryable to force query parsing and capture resolution
var executor = new NullExecutor(schema, collectionName ?? schema.CollectionName);
var queryable = new NullQueryable <T>(executor);
var unused = descending ? queryable.OrderByDescending(selector).ToList() : queryable.OrderBy(selector).ToList();
var query = executor.Expression;
query.CollectionName = typeof(T).Name;
return(query);
}
public static OrQuery PredicateToQuery <T>(Expression <Func <T, bool> > where, string collectionName = null)
{
var schema = TypeDescriptionsCache.GetDescription(typeof(T));
collectionName ??= schema.CollectionName;
// create a fake queryable to force query parsing and capture resolution
var executor = new NullExecutor(schema, collectionName);
var queryable = new NullQueryable <T>(executor);
var unused = queryable.Where(where).ToList();
var query = executor.Expression;
query.CollectionName = typeof(T).Name;
return(query);
}
