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