//---------------------------------------------------------------------
// <copyright file="ISqlFragment.cs" company="Microsoft">
// Portions of this file copyright (c) Microsoft Corporation
// and are released under the Microsoft Pulic License. See
// http://archive.msdn.microsoft.com/EFSampleProvider/Project/License.aspx
// or License.txt for details.
// All rights reserved.
// </copyright>
//---------------------------------------------------------------------
namespace System.Data.SQLite
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Data.Metadata.Edm;
using System.Data.Common.CommandTrees;
/// <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);
}
}