/// <summary> /// We delegate the writing of the fragment to the appropriate type. /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public virtual void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { if (null != _sqlFragments) { foreach (var o in _sqlFragments) { var str = (o as String); if (null != str) { writer.Write(str); } else { var sqlFragment = (o as ISqlFragment); if (null != sqlFragment) { sqlFragment.WriteSql(writer, sqlGenerator); } else { throw new InvalidOperationException(); } } } } }
/// <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 (NeedsRenaming) { int i; if (sqlGenerator.AllColumnNames.TryGetValue(NewName, out i)) { string newNameCandidate; do { ++i; newNameCandidate = NewName + i.ToString(CultureInfo.InvariantCulture); }while (sqlGenerator.AllColumnNames.ContainsKey(newNameCandidate)); sqlGenerator.AllColumnNames[NewName] = i; NewName = newNameCandidate; } // Add this column name to list of known names so that there are no subsequent // collisions sqlGenerator.AllColumnNames[NewName] = 0; // Prevent it from being renamed repeatedly. NeedsRenaming = false; } writer.Write(SqlGenerator.QuoteIdentifier(NewName)); }
/// <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 (NeedsRenaming) { int i; if (sqlGenerator.AllColumnNames.TryGetValue(NewName, out i)) { string newNameCandidate; do { ++i; newNameCandidate = NewName + i.ToString(CultureInfo.InvariantCulture); } while (sqlGenerator.AllColumnNames.ContainsKey(newNameCandidate)); sqlGenerator.AllColumnNames[NewName] = i; NewName = newNameCandidate; } // Add this column name to list of known names so that there are no subsequent // collisions sqlGenerator.AllColumnNames[NewName] = 0; // Prevent it from being renamed repeatedly. NeedsRenaming = false; } writer.Write(SqlGenerator.QuoteIdentifier(NewName)); }
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { #region Check if FROM aliases need to be renamed // Create a list of the aliases used by the outer extents // JoinSymbols have to be treated specially. List<string> outerExtentAliases = null; if ((null != outerExtents) && (0 < outerExtents.Count)) { foreach (Symbol outerExtent in outerExtents.Keys) { JoinSymbol joinSymbol = outerExtent as JoinSymbol; if (joinSymbol != null) { foreach (Symbol symbol in joinSymbol.FlattenedExtentList) { if (null == outerExtentAliases) { outerExtentAliases = new List<string>(); } outerExtentAliases.Add(symbol.NewName); } } else { if (null == outerExtentAliases) { 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 (null != extentList) { foreach (Symbol fromAlias in extentList) { if ((null != outerExtentAliases) && 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 (null == outerExtentAliases) { outerExtentAliases = new List<string>(); } outerExtentAliases.Add(fromAlias.NewName); } } #endregion // Increase the indent, so that the Sql statement is nested by one tab. writer.Indent++; writer.Write("SELECT "); if (this.IsDistinct) { writer.Write("DISTINCT "); } 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.First != null || this.Skip != null)) { writer.WriteLine(); writer.Write("ORDER BY "); this.OrderBy.WriteSql(writer, sqlGenerator); } if (this.First != null) { writer.WriteLine(); writer.Write("LIMIT "); this.First.WriteSql(writer, sqlGenerator); writer.Write(" "); } if (this.Skip != null) { writer.WriteLine(); writer.Write("OFFSET "); this.Skip.WriteSql(writer, sqlGenerator); writer.Write(" "); } writer.Indent--; }
public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { #region Check if FROM aliases need to be renamed // Create a list of the aliases used by the outer extents // JoinSymbols have to be treated specially. List <string> outerExtentAliases = null; if ((null != outerExtents) && (0 < outerExtents.Count)) { foreach (Symbol outerExtent in outerExtents.Keys) { JoinSymbol joinSymbol = outerExtent as JoinSymbol; if (joinSymbol != null) { foreach (Symbol symbol in joinSymbol.FlattenedExtentList) { if (null == outerExtentAliases) { outerExtentAliases = new List <string>(); } outerExtentAliases.Add(symbol.NewName); } } else { if (null == outerExtentAliases) { 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 (null != extentList) { foreach (Symbol fromAlias in extentList) { if ((null != outerExtentAliases) && 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 (null == outerExtentAliases) { outerExtentAliases = new List <string>(); } outerExtentAliases.Add(fromAlias.NewName); } } #endregion // Increase the indent, so that the Sql statement is nested by one tab. writer.Indent++; writer.Write("SELECT "); if (this.IsDistinct) { writer.Write("DISTINCT "); } 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.First != null || this.Skip != null)) { writer.WriteLine(); writer.Write("ORDER BY "); this.OrderBy.WriteSql(writer, sqlGenerator); } if (this.First != null) { writer.WriteLine(); writer.Write("LIMIT "); this.First.WriteSql(writer, sqlGenerator); writer.Write(" "); } if (this.Skip != null) { writer.WriteLine(); writer.Write("OFFSET "); this.Skip.WriteSql(writer, sqlGenerator); writer.Write(" "); } writer.Indent--; }