90 lines
2.8 KiB
C#
90 lines
2.8 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="DbDeleteCommandTree.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner Microsoft, Microsoft
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// @backupOwner Microsoft
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//---------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Data.Metadata.Edm;
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using System.Data.Common.CommandTrees.Internal;
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using System.Data.Common.Utils;
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namespace System.Data.Common.CommandTrees
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{
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/// <summary>
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/// Represents a single row delete operation expressed as a canonical command tree.
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/// </summary>
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Db")]
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public sealed class DbDeleteCommandTree : DbModificationCommandTree
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{
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private readonly DbExpression _predicate;
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internal DbDeleteCommandTree(MetadataWorkspace metadata, DataSpace dataSpace, DbExpressionBinding target, DbExpression predicate)
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: base(metadata, dataSpace, target)
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{
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EntityUtil.CheckArgumentNull(predicate, "predicate");
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this._predicate = predicate;
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}
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/// <summary>
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/// Gets an <see cref="DbExpression"/> that specifies the predicate used to determine which members of the target collection should be deleted.
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/// </summary>
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/// <remarks>
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/// The predicate can include only the following elements:
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/// <list>
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/// <item>Equality expression</item>
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/// <item>Constant expression</item>
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/// <item>IsNull expression</item>
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/// <item>Property expression</item>
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/// <item>Reference expression to the target</item>
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/// <item>And expression</item>
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/// <item>Or expression</item>
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/// <item>Not expression</item>
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/// </list>
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/// </remarks>
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public DbExpression Predicate
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{
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get
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{
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return _predicate;
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}
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}
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internal override DbCommandTreeKind CommandTreeKind
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{
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get { return DbCommandTreeKind.Delete; }
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}
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internal override bool HasReader
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{
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get
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{
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// a delete command never returns server-gen values, and
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// therefore never returns a reader
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return false;
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}
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}
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internal override void DumpStructure(ExpressionDumper dumper)
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{
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base.DumpStructure(dumper);
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if (this.Predicate != null)
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{
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dumper.Dump(this.Predicate, "Predicate");
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}
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}
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internal override string PrintTree(ExpressionPrinter printer)
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{
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return printer.Print(this);
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}
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}
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}
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