61 lines
2.3 KiB
C#
61 lines
2.3 KiB
C#
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using System;
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using System.Collections.ObjectModel;
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using System.Text;
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namespace System.Data.Linq.SqlClient {
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/// <summary>
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/// Methods for checking whethe a query was compatible with the
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/// server it will be sent to.
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/// </summary>
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static internal class SqlServerCompatibilityCheck {
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/// <summary>
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/// Private visitor class checks each node for compatibility annotations.
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/// </summary>
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private class Visitor : SqlVisitor {
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private SqlProvider.ProviderMode provider;
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internal SqlNodeAnnotations annotations;
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internal Visitor(SqlProvider.ProviderMode provider) {
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this.provider = provider;
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}
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/// <summary>
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/// The reasons why this query is not 2K compatible.
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/// </summary>
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internal Collection<string> reasons = new Collection<string>();
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internal override SqlNode Visit(SqlNode node) {
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if (annotations.NodeIsAnnotated(node)) {
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foreach (SqlNodeAnnotation annotation in annotations.Get(node)) {
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SqlServerCompatibilityAnnotation ssca = annotation as SqlServerCompatibilityAnnotation;
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if (ssca != null && ssca.AppliesTo(provider)) {
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reasons.Add(annotation.Message);
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}
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}
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}
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return base.Visit(node);
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}
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}
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/// <summary>
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/// Checks whether the given node is supported on the given server.
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/// </summary>
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internal static void ThrowIfUnsupported(SqlNode node, SqlNodeAnnotations annotations, SqlProvider.ProviderMode provider) {
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// Check to see whether there's at least one SqlServerCompatibilityAnnotation.
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if (annotations.HasAnnotationType(typeof(SqlServerCompatibilityAnnotation))) {
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Visitor visitor = new Visitor(provider);
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visitor.annotations = annotations;
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visitor.Visit(node);
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// If any messages were recorded, then throw an exception.
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if (visitor.reasons.Count > 0) {
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throw Error.ExpressionNotSupportedForSqlServerVersion(visitor.reasons);
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}
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}
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}
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}
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}
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