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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / SqlClient / Query / SqlTopReducer.cs / 1305376 / SqlTopReducer.cs
using System; using System.Collections.Generic; using System.Linq.Expressions; using System.Reflection; using System.Data.Linq; using System.Data.Linq.Provider; using System.Linq; namespace System.Data.Linq.SqlClient { internal class SqlTopReducer { internal static SqlNode Reduce(SqlNode node, SqlNodeAnnotations annotations, SqlFactory sql) { return new Visitor(annotations, sql).Visit(node); } class Visitor : SqlVisitor { SqlNodeAnnotations annotations; SqlFactory sql; internal Visitor(SqlNodeAnnotations annotations, SqlFactory sql) { this.annotations = annotations; this.sql = sql; } internal override SqlSelect VisitSelect(SqlSelect select) { base.VisitSelect(select); if (select.Top != null) { if (select.Top.NodeType == SqlNodeType.Value) { SqlValue val = (SqlValue)select.Top; // convert to literal value for SQL2K compatibility if (val.IsClientSpecified) { select.Top = sql.Value(val.ClrType, val.SqlType, val.Value, false, val.SourceExpression); } } else { // cannot be converted to literal value. note that this select is not SQL2K compatible this.annotations.Add(select.Top, new SqlServerCompatibilityAnnotation(Strings.SourceExpressionAnnotation(select.Top.SourceExpression), SqlProvider.ProviderMode.Sql2000)); } } return select; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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