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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / SqlClient / SqlGen / Symbol.cs / 1305376 / Symbol.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 { ////// internal class Symbol : ISqlFragment { ////// This class represents an extent/nested select statement, /// or a column. /// /// The important fields are Name, Type and NewName. /// NewName starts off the same as Name, and is then modified as necessary. /// /// /// The rest are used by special symbols. /// e.g. NeedsRenaming is used by columns to indicate that a new name must /// be picked for the column in the second phase of translation. /// /// IsUnnest is used by symbols for a collection expression used as a from clause. /// This allows to add the column list /// after the alias. /// /// /// Used to track the columns originating from this Symbol when it is used /// in as a from extent in a SqlSelectStatement with a Join or as a From Extent /// in a Join Symbol. /// private Dictionarycolumns; internal Dictionary Columns { get { if (null == columns) { columns = new Dictionary (StringComparer.OrdinalIgnoreCase); } return columns; } } /// /// Used to track the output columns of a SqlSelectStatement it represents /// private DictionaryoutputColumns; internal Dictionary OutputColumns { get { if (null == outputColumns) { outputColumns = new Dictionary (StringComparer.OrdinalIgnoreCase); } return outputColumns; } } private bool needsRenaming; internal bool NeedsRenaming { get { return needsRenaming; } set { needsRenaming = value; } } private bool outputColumnsRenamed; internal bool OutputColumnsRenamed { get { return outputColumnsRenamed; } set { outputColumnsRenamed = value; } } private string name; public string Name { get { return name; } } private string newName; public string NewName { get { return newName; } set { newName = value; } } private TypeUsage type; internal TypeUsage Type { get { return type; } set { type = value; } } public Symbol(string name, TypeUsage type) { this.name = name; this.newName = name; this.Type = type; } /// /// Use this constructor if the symbol represents a SqlStatement for which the output columns need to be tracked. /// /// /// /// /// public Symbol(string name, TypeUsage type, DictionaryoutputColumns, bool outputColumnsRenamed) { this.name = name; this.newName = name; this.Type = type; this.outputColumns = outputColumns; this.OutputColumnsRenamed = outputColumnsRenamed; } #region ISqlFragment Members /// /// Write this symbol out as a string for sql. This is just /// the new name of the symbol (which could be the same as the old name). /// /// We rename columns here if necessary. /// /// /// public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { if (this.NeedsRenaming) { int i; if (sqlGenerator.AllColumnNames.TryGetValue(this.NewName, out i)) { string newNameCandidate; do { ++i; newNameCandidate = this.NewName + i.ToString(System.Globalization.CultureInfo.InvariantCulture); } while (sqlGenerator.AllColumnNames.ContainsKey(newNameCandidate)); sqlGenerator.AllColumnNames[this.NewName] = i; this.NewName = newNameCandidate; } // Add this column name to list of known names so that there are no subsequent // collisions sqlGenerator.AllColumnNames[this.NewName] = 0; // Prevent it from being renamed repeatedly. this.NeedsRenaming = false; } writer.Write(SqlGenerator.QuoteIdentifier(this.NewName)); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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