46 lines
1.7 KiB
C#
46 lines
1.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Data.Linq;
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using System.Data.Linq.Provider;
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using System.Linq;
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namespace System.Data.Linq.SqlClient {
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internal class SqlTopReducer {
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internal static SqlNode Reduce(SqlNode node, SqlNodeAnnotations annotations, SqlFactory sql) {
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return new Visitor(annotations, sql).Visit(node);
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}
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class Visitor : SqlVisitor {
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SqlNodeAnnotations annotations;
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SqlFactory sql;
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internal Visitor(SqlNodeAnnotations annotations, SqlFactory sql) {
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this.annotations = annotations;
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this.sql = sql;
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}
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internal override SqlSelect VisitSelect(SqlSelect select) {
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base.VisitSelect(select);
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if (select.Top != null) {
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if (select.Top.NodeType == SqlNodeType.Value) {
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SqlValue val = (SqlValue)select.Top;
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// convert to literal value for SQL2K compatibility
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if (val.IsClientSpecified) {
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select.Top = sql.Value(val.ClrType, val.SqlType, val.Value, false, val.SourceExpression);
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}
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}
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else {
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// cannot be converted to literal value. note that this select is not SQL2K compatible
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this.annotations.Add(select.Top, new SqlServerCompatibilityAnnotation(Strings.SourceExpressionAnnotation(select.Top.SourceExpression), SqlProvider.ProviderMode.Sql2000));
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}
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}
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return select;
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}
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}
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}
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}
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