Ejemplo n.º 1
0
        internal static Expression Parameterize(TableAlias outerAlias, Expression expr)
        {
            OuterParameterizer op = new OuterParameterizer();

            op.outerAlias = outerAlias;
            return(op.Visit(expr));
        }
Ejemplo n.º 2
0
        /// <summary>
        /// Executes the projection.
        /// </summary>
        /// <param name="projection">The projection.</param>
        /// <param name="okayToDefer">if set to <c>true</c> [okay to defer].</param>
        /// <returns></returns>
        private Expression ExecuteProjection(ProjectionExpression projection, bool okayToDefer)
        {
            // parameterize query
            projection = (ProjectionExpression)this.Parameterize(projection);

            if (this.scope != null)
            {
                // also convert references to outer alias to named values!  these become SQL parameters too
                projection = (ProjectionExpression)OuterParameterizer.Parameterize(this.scope.Alias, projection);
            }

            FixColumnNames(projection);

            string commandText = this.linguist.Format(projection.Select);
            ReadOnlyCollection <NamedValueExpression> namedValues = NamedValueGatherer.Gather(projection.Select);
            QueryCommand command = new QueryCommand(commandText, namedValues.Select(v => new QueryParameter(v.Name, v.Type)));

            Expression[] values = namedValues.Select(v => Expression.Convert(this.Visit(v.Value), typeof(object))).ToArray();

            return(this.ExecuteProjection(projection, okayToDefer, command, values));
        }