39 lines
1.5 KiB
C#
39 lines
1.5 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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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.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 SampleEntityFrameworkProvider
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{
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/// <summary>
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/// Represents the sql fragment for any node in the query tree.
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/// </summary>
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/// <remarks>
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/// The nodes in a query tree produce various kinds of sql
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/// <list type="bullet">
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/// <item>A select statement.</item>
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/// <item>A reference to an extent. (symbol)</item>
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/// <item>A raw string.</item>
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/// </list>
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/// We have this interface to allow for a common return type for the methods
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/// in the expression visitor <see cref="DbExpressionVisitor{T}"/>
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///
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/// At the end of translation, the sql fragments are converted into real strings.
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/// </remarks>
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internal interface ISqlFragment
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{
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/// <summary>
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/// Write the string represented by this fragment into the stream.
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/// </summary>
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/// <param name="writer">The stream that collects the strings.</param>
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/// <param name="sqlGenerator">Context information used for renaming.
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/// The global lists are used to generated new names without collisions.</param>
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void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator);
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}
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}
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