50 lines
1.4 KiB
C#
50 lines
1.4 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.Data.Linq;
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namespace System.Data.Linq.SqlClient {
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internal class SqlAggregateChecker {
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Visitor visitor;
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internal SqlAggregateChecker() {
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this.visitor = new Visitor();
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}
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internal bool HasAggregates(SqlNode node) {
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visitor.hasAggregates = false;
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visitor.Visit(node);
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return visitor.hasAggregates;
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}
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class Visitor : SqlVisitor {
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internal bool hasAggregates;
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internal Visitor() {
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}
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internal override SqlExpression VisitSubSelect(SqlSubSelect ss) {
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return ss;
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}
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internal override SqlSource VisitSource(SqlSource source) {
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return source;
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}
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internal override SqlExpression VisitUnaryOperator(SqlUnary uo) {
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switch (uo.NodeType) {
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case SqlNodeType.Min:
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case SqlNodeType.Max:
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case SqlNodeType.Avg:
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case SqlNodeType.Sum:
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case SqlNodeType.Count:
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case SqlNodeType.LongCount:
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this.hasAggregates = true;
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return uo;
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default:
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return base.VisitUnaryOperator(uo);
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}
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}
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}
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}
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}
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