108 lines
3.1 KiB
C#
108 lines
3.1 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="TopClause.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 [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Globalization;
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using System.IO;
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using System.Text;
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using System.Data.SqlClient;
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using System.Data.Metadata.Edm;
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using System.Data.Common.CommandTrees;
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namespace System.Data.SqlClient.SqlGen
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{
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/// <summary>
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/// TopClause represents the a TOP expression in a SqlSelectStatement.
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/// It has a count property, which indicates how many TOP rows should be selected and a
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/// boolen WithTies property.
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/// </summary>
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class TopClause : ISqlFragment
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{
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ISqlFragment topCount;
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bool withTies;
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/// <summary>
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/// Do we need to add a WITH_TIES to the top statement
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/// </summary>
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internal bool WithTies
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{
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get { return withTies; }
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}
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/// <summary>
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/// How many top rows should be selected.
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/// </summary>
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internal ISqlFragment TopCount
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{
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get { return topCount; }
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}
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/// <summary>
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/// Creates a TopClause with the given topCount and withTies.
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/// </summary>
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/// <param name="topCount"></param>
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/// <param name="withTies"></param>
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internal TopClause(ISqlFragment topCount, bool withTies)
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{
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this.topCount = topCount;
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this.withTies = withTies;
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}
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/// <summary>
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/// Creates a TopClause with the given topCount and withTies.
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/// </summary>
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/// <param name="topCount"></param>
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/// <param name="withTies"></param>
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internal TopClause(int topCount, bool withTies)
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{
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SqlBuilder sqlBuilder = new SqlBuilder();
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sqlBuilder.Append(topCount.ToString(CultureInfo.InvariantCulture));
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this.topCount = sqlBuilder;
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this.withTies = withTies;
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}
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#region ISqlFragment Members
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/// <summary>
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/// Write out the TOP part of sql select statement
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/// It basically writes TOP (X) [WITH TIES].
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/// The brackets around X are ommited for Sql8.
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/// </summary>
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/// <param name="writer"></param>
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/// <param name="sqlGenerator"></param>
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public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator)
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{
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writer.Write("TOP ");
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if (sqlGenerator.SqlVersion != SqlVersion.Sql8)
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{
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writer.Write("(");
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}
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this.TopCount.WriteSql(writer, sqlGenerator);
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if (sqlGenerator.SqlVersion != SqlVersion.Sql8)
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{
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writer.Write(")");
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}
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writer.Write(" ");
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if (this.WithTies)
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{
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writer.Write("WITH TIES ");
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}
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}
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#endregion
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}
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}
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