public static void ReWrite(QueryModel queryModel, ISessionFactory sessionFactory)
{
var nsqmv = new NestedSelectDetector(sessionFactory);
nsqmv.VisitExpression(queryModel.SelectClause.Selector);
if (!nsqmv.HasSubqueries)
{
return;
}
var elementExpression = new List <ExpressionHolder>();
var group = Expression.Parameter(typeof(IGrouping <Tuple, Tuple>), "g");
var replacements = new Dictionary <Expression, Expression>();
foreach (var expression in nsqmv.Expressions)
{
var processed = ProcessExpression(queryModel, sessionFactory, expression, elementExpression, group);
if (processed != null)
{
replacements.Add(expression, processed);
}
}
var key = Expression.Property(group, "Key");
var expressions = new List <ExpressionHolder>();
var identifier = GetIdentifier(sessionFactory, new QuerySourceReferenceExpression(queryModel.MainFromClause));
var rewriter = new SelectClauseRewriter(key, expressions, identifier, replacements);
var resultSelector = rewriter.VisitExpression(queryModel.SelectClause.Selector);
elementExpression.AddRange(expressions);
var keySelector = CreateSelector(elementExpression, 0);
var elementSelector = CreateSelector(elementExpression, 1);
var groupBy = EnumerableHelper.GetMethod("GroupBy",
new[] { typeof(IEnumerable <>), typeof(Func <,>), typeof(Func <,>) },
new[] { typeof(object[]), typeof(Tuple), typeof(Tuple) });
var input = Expression.Parameter(typeof(IEnumerable <object>), "input");
var lambda = Expression.Lambda(
Expression.Call(groupBy,
Expression.Call(CastMethod, input),
keySelector,
elementSelector),
input);
queryModel.ResultOperators.Add(new ClientSideSelect2(lambda));
queryModel.ResultOperators.Add(new ClientSideSelect(Expression.Lambda(resultSelector, @group)));
var initializers = elementExpression.Select(e => ConvertToObject(e.Expression));
queryModel.SelectClause.Selector = Expression.NewArrayInit(typeof(object), initializers);
}
public static void ReWrite(QueryModel queryModel, ISessionFactory sessionFactory)
{
var nsqmv = new NestedSelectDetector(sessionFactory);
nsqmv.VisitExpression(queryModel.SelectClause.Selector);
if (!nsqmv.HasSubqueries)
return;
var elementExpression = new List<ExpressionHolder>();
var group = Expression.Parameter(typeof (IGrouping<Tuple, Tuple>), "g");
var replacements = new Dictionary<Expression, Expression>();
foreach (var expression in nsqmv.Expressions)
{
var processed = ProcessExpression(queryModel, sessionFactory, expression, elementExpression, group);
if (processed != null)
replacements.Add(expression, processed);
}
var key = Expression.Property(group, "Key");
var expressions = new List<ExpressionHolder>();
var identifier = GetIdentifier(sessionFactory, new QuerySourceReferenceExpression(queryModel.MainFromClause));
var rewriter = new SelectClauseRewriter(key, expressions, identifier, replacements);
var resultSelector = rewriter.VisitExpression(queryModel.SelectClause.Selector);
elementExpression.AddRange(expressions);
var keySelector = CreateSelector(elementExpression, 0);
var elementSelector = CreateSelector(elementExpression, 1);
var groupBy = EnumerableHelper.GetMethod("GroupBy",
new[] { typeof (IEnumerable<>), typeof (Func<,>), typeof (Func<,>) },
new[] { typeof (object[]), typeof (Tuple), typeof (Tuple) });
var input = Expression.Parameter(typeof (IEnumerable<object>), "input");
var lambda = Expression.Lambda(
Expression.Call(groupBy,
Expression.Call(CastMethod, input),
keySelector,
elementSelector),
input);
queryModel.ResultOperators.Add(new ClientSideSelect2(lambda));
queryModel.ResultOperators.Add(new ClientSideSelect(Expression.Lambda(resultSelector, @group)));
var initializers = elementExpression.Select(e => ConvertToObject(e.Expression));
queryModel.SelectClause.Selector = Expression.NewArrayInit(typeof (object), initializers);
}
public static void ReWrite(QueryModel queryModel, ISessionFactory sessionFactory)
{
var nsqmv = new NestedSelectDetector();
nsqmv.VisitExpression(queryModel.SelectClause.Selector);
if (!nsqmv.HasSubquery)
return;
var subQueryModel = nsqmv.Expression.QueryModel;
var mainFromClause = subQueryModel.MainFromClause;
var restrictions = subQueryModel.BodyClauses
.OfType<WhereClause>()
.Select(w => new NhWithClause(w.Predicate));
var join = new NhJoinClause(mainFromClause.ItemName,
mainFromClause.ItemType,
mainFromClause.FromExpression,
restrictions);
queryModel.BodyClauses.Add(join);
var visitor = new SwapQuerySourceVisitor(subQueryModel.MainFromClause, join);
queryModel.TransformExpressions(visitor.Swap);
var ctor = Tuple.Type.GetConstructor(System.Type.EmptyTypes);
var key = Expression.Parameter(Tuple.Type, "key");
var values = Expression.Parameter(typeof (IEnumerable<Tuple>), "values");
var expressions = new List<ExpressionHolder>();
var rewriter = new SelectClauseRewriter(key, values, expressions);
var resultSelector = rewriter.VisitExpression(queryModel.SelectClause.Selector);
var field = Tuple.Type.GetField("Items");
var keySelector = CreateSelector(ctor, field, expressions, 0);
var elementSelector = CreateSelector(ctor, field, expressions, 1);
var cast = EnumerableHelper.GetMethod("Cast", new[] {typeof (IEnumerable)}, new[] {typeof (object[])});
var groupBy = EnumerableHelper.GetMethod("GroupBy",
new[] {typeof (IEnumerable<>), typeof (Func<,>), typeof (Func<,>), typeof (Func<,,>)},
new[] {typeof (object[]), Tuple.Type, Tuple.Type, queryModel.SelectClause.Selector.Type});
var toList = EnumerableHelper.GetMethod("ToList", new[] { typeof(IEnumerable<>) }, new[] { queryModel.SelectClause.Selector.Type });
var input = Expression.Parameter(typeof (IEnumerable<object>), "input");
var call = Expression.Call(toList,
Expression.Call(groupBy,
Expression.Call(cast, input),
keySelector,
elementSelector,
Expression.Lambda(resultSelector, key, values)));
var lambda = Expression.Lambda(call, input);
queryModel.ResultOperators.Add(new ClientSideSelect2(lambda));
var initializers = expressions.Select(e => e.Expression == null
? GetIdentifier(sessionFactory, expressions, e)
: ConvertToObject(e.Expression));
queryModel.SelectClause.Selector = Expression.NewArrayInit(typeof (object), initializers);
}
public static void ReWrite(QueryModel queryModel, ISessionFactory sessionFactory)
{
var nsqmv = new NestedSelectDetector();
nsqmv.VisitExpression(queryModel.SelectClause.Selector);
if (!nsqmv.HasSubquery)
{
return;
}
var subQueryModel = nsqmv.Expression.QueryModel;
var mainFromClause = subQueryModel.MainFromClause;
var restrictions = subQueryModel.BodyClauses
.OfType <WhereClause>()
.Select(w => new NhWithClause(w.Predicate));
var join = new NhJoinClause(mainFromClause.ItemName,
mainFromClause.ItemType,
mainFromClause.FromExpression,
restrictions);
queryModel.BodyClauses.Add(join);
var visitor = new SwapQuerySourceVisitor(subQueryModel.MainFromClause, join);
queryModel.TransformExpressions(visitor.Swap);
var ctor = Tuple.Type.GetConstructor(System.Type.EmptyTypes);
var key = Expression.Parameter(Tuple.Type, "key");
var values = Expression.Parameter(typeof(IEnumerable <Tuple>), "values");
var expressions = new List <ExpressionHolder>();
var rewriter = new SelectClauseRewriter(key, values, expressions);
var resultSelector = rewriter.VisitExpression(queryModel.SelectClause.Selector);
var field = Tuple.Type.GetField("Items");
var keySelector = CreateSelector(ctor, field, expressions, 0);
var elementSelector = CreateSelector(ctor, field, expressions, 1);
var cast = EnumerableHelper.GetMethod("Cast", new[] { typeof(IEnumerable) }, new[] { typeof(object[]) });
var groupBy = EnumerableHelper.GetMethod("GroupBy",
new[] { typeof(IEnumerable <>), typeof(Func <,>), typeof(Func <,>), typeof(Func <, ,>) },
new[] { typeof(object[]), Tuple.Type, Tuple.Type, queryModel.SelectClause.Selector.Type });
var toList = EnumerableHelper.GetMethod("ToList", new[] { typeof(IEnumerable <>) }, new[] { queryModel.SelectClause.Selector.Type });
var input = Expression.Parameter(typeof(IEnumerable <object>), "input");
var call = Expression.Call(toList,
Expression.Call(groupBy,
Expression.Call(cast, input),
keySelector,
elementSelector,
Expression.Lambda(resultSelector, key, values)));
var lambda = Expression.Lambda(call, input);
queryModel.ResultOperators.Add(new ClientSideSelect2(lambda));
var initializers = expressions.Select(e => e.Expression == null
? GetIdentifier(sessionFactory, expressions, e)
: ConvertToObject(e.Expression));
queryModel.SelectClause.Selector = Expression.NewArrayInit(typeof(object), initializers);
}