using System; using System.Linq.Expressions; using System.Reflection; using System.Diagnostics; namespace SqlLinq.SyntaxTree.Expressions { [SyntaxNode(RuleConstants.RULE_TUPLE_LPAREN_RPAREN)] public class TupleSelectNode : ExpressionNode { public TupleSelectNode() { } internal override Expression CreateExpression(ParameterExpression sourceData, ParameterExpression param) { SelectNode select = FindChild<SelectNode>(1); Debug.Assert(select != null); Debug.Assert(select.IsScalarHint, "record set sub queries don't work yet"); Type queryType = typeof(ScalarQuery<,>).MakeGenericType(param.Type, typeof(object)); ICompile query = (ICompile)Activator.CreateInstance(queryType, "subquery"); query.Compile(select); return Expression.Call(Expression.Constant(query), query.GetType().GetMethod("Evaluate"), sourceData); } } }
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10 PRINT "Don is cool" 20 GOTO 10