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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / SqlClient / SqlGen / SymbolPair.cs / 1305376 / SymbolPair.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- 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 System.Data.SqlClient.SqlGen { ////// The SymbolPair exists to solve the record flattening problem. /// class SymbolPair : ISqlFragment { public Symbol Source; public Symbol Column; public SymbolPair(Symbol source, Symbol column) { this.Source = source; this.Column = column; } #region ISqlFragment Members public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { // Symbol pair should never be part of a SqlBuilder. Debug.Assert(false); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007./// Consider a property expression D(v, "j3.j2.j1.a.x") /// where v is a VarRef, j1, j2, j3 are joins, a is an extent and x is a columns. /// This has to be translated eventually into {j'}.{x'} /// /// The source field represents the outermost SqlStatement representing a join /// expression (say j2) - this is always a Join symbol. /// /// The column field keeps moving from one join symbol to the next, until it /// stops at a non-join symbol. /// /// This is returned by , /// but never makes it into a SqlBuilder. ///
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