/// <summary> /// 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. /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { if (this.NeedsRenaming) { string newName; int i = sqlGenerator.AllColumnNames[this.NewName]; do { ++i; newName = this.Name + i.ToString(System.Globalization.CultureInfo.InvariantCulture); } while (sqlGenerator.AllColumnNames.ContainsKey(newName)); sqlGenerator.AllColumnNames[this.NewName] = i; // Prevent it from being renamed repeatedly. this.NeedsRenaming = false; this.NewName = newName; // Add this column name to list of known names so that there are no subsequent // collisions sqlGenerator.AllColumnNames[newName] = 0; } writer.Write(JetProviderManifest.QuoteIdentifier(this.NewName)); }
/// <summary> /// Write out the SKIP part of sql select statement /// It basically writes SKIP (X) /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { writer.Write(" SKIP "); writer.Write(_skipCount.ToString(CultureInfo.InvariantCulture)); writer.Write(" "); }
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { // Symbol pair should never be part of a SqlBuilder. Debug.Assert(false); }
/// <summary> /// Write out a SQL select statement as a string. /// We have to /// <list type="number"> /// <item>Check whether the aliases extents we use in this statement have /// to be renamed. /// We first create a list of all the aliases used by the outer extents. /// For each of the FromExtents( or AllJoinExtents if it is non-null), /// rename it if it collides with the previous list. /// </item> /// <item>Write each of the clauses (if it exists) as a string</item> /// </list> /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { // Create a list of the aliases used by the outer extents // JoinSymbols have to be treated specially. List <string> outerExtentAliases = null; if (_outerExtents != null && _outerExtents.Count > 0) { foreach (Symbol outerExtent in _outerExtents.Keys) { JoinSymbol joinSymbol = outerExtent as JoinSymbol; if (joinSymbol != null) { foreach (Symbol symbol in joinSymbol.FlattenedExtentList) { if (outerExtentAliases == null) { outerExtentAliases = new List <string>(); } outerExtentAliases.Add(symbol.NewName); } } else { if (outerExtentAliases == null) { outerExtentAliases = new List <string>(); } outerExtentAliases.Add(outerExtent.NewName); } } } // An then rename each of the FromExtents we have // If AllJoinExtents is non-null - it has precedence. // The new name is derived from the old name - we append an increasing int. List <Symbol> extentList = this.AllJoinExtents ?? this._fromExtents; if (extentList != null) { foreach (Symbol fromAlias in extentList) { if ((outerExtentAliases != null) && outerExtentAliases.Contains(fromAlias.Name)) { int i = sqlGenerator.AllExtentNames[fromAlias.Name]; string newName; do { ++i; newName = fromAlias.Name + i.ToString(System.Globalization.CultureInfo.InvariantCulture); }while (sqlGenerator.AllExtentNames.ContainsKey(newName)); sqlGenerator.AllExtentNames[fromAlias.Name] = i; fromAlias.NewName = newName; // Add extent to list of known names (although i is always incrementing, "prefix11" can // eventually collide with "prefix1" when it is extended) sqlGenerator.AllExtentNames[newName] = 0; } // Add the current alias to the list, so that the extents // that follow do not collide with me. if (outerExtentAliases == null) { outerExtentAliases = new List <string>(); } outerExtentAliases.Add(fromAlias.NewName); } } // Increase the indent, so that the Sql statement is nested by one tab. writer.Indent += 1; // ++ can be confusing in this context writer.Write("SELECT "); if (IsDistinct) { writer.Write("DISTINCT "); } if (this.Top != null) { if (this.Skip != null) { this.Top.Skip = this.Skip.SkipCount; } this.Top.WriteSql(writer, sqlGenerator); } if (this._select == null || this.Select.IsEmpty) { Debug.Assert(false); // we have removed all possibilities of SELECT *. writer.Write("*"); } else { this.Select.WriteSql(writer, sqlGenerator); } writer.WriteLine(); writer.Write("FROM "); this.From.WriteSql(writer, sqlGenerator); if (this._where != null && !this.Where.IsEmpty) { writer.WriteLine(); writer.Write("WHERE "); this.Where.WriteSql(writer, sqlGenerator); } if (this._groupBy != null && !this.GroupBy.IsEmpty) { writer.WriteLine(); writer.Write("GROUP BY "); this.GroupBy.WriteSql(writer, sqlGenerator); } if (this._orderBy != null && !this.OrderBy.IsEmpty && (this.IsTopMost || this.Top != null || this.Skip != null)) { writer.WriteLine(); writer.Write("ORDER BY "); this.OrderBy.WriteSql(writer, sqlGenerator); } if (this.Skip != null) { this.Skip.WriteSql(writer, sqlGenerator); } --writer.Indent; }