/// <summary> /// Write out the OFFSET part of sql select statement /// It basically writes OFFSET X ROWS. /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { writer.Write("OFFSET "); SkipCount.WriteSql(writer, sqlGenerator); writer.Write(" ROWS"); writer.Write(" "); }
/// <summary> /// Write out the OFFSET part of sql select statement /// It basically writes OFFSET X ROWS. /// </summary> /// <param name="writer"> </param> /// <param name="sqlGenerator"> </param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { writer.Write("OFFSET "); SkipCount.WriteSql(writer, sqlGenerator); writer.Write(" ROWS"); writer.Write(" "); }
// <summary> // Write out the TOP part of sql select statement // It basically writes TOP (X) [WITH TIES]. // The brackets around X are ommited for Sql8. // </summary> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { writer.Write("TOP "); writer.Write("("); TopCount.WriteSql(writer, sqlGenerator); writer.Write(")"); writer.Write(" "); Debug.Assert(!WithTies, "WITH TIES cannot be true for Top clause"); }
/// <summary> /// Write out the TOP part of sql select statement /// It basically writes TOP (X) [WITH TIES]. /// The brackets around X are ommited for Sql8. /// </summary> /// <param name="writer"></param> /// <param name="sqlGenerator"></param> public void WriteSql(SqlWriter writer, SqlGenerator sqlGenerator) { writer.Write("TOP "); writer.Write("("); TopCount.WriteSql(writer, sqlGenerator); writer.Write(")"); writer.Write(" "); Debug.Assert(!WithTies, "WITH TIES cannot be true for Top clause"); }
// This function generates OFFSET, FETCH clause from Top and Skip information. // Note that this should be used only when Skip is present. For only Top, TopClause.WriteSql() // private static void WriteOffsetFetch(SqlWriter writer, TopClause top, SkipClause skip, SqlGenerator sqlGenerator) { DebugCheck.NotNull(skip); skip.WriteSql(writer, sqlGenerator); if (top != null) { writer.Write("FETCH NEXT "); top.TopCount.WriteSql(writer, sqlGenerator); writer.Write(" ROWS ONLY"); writer.Write(" "); } }
// <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> 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> /// We delegate the writing of the fragment to the appropriate type. /// </summary> /// <param name="writer"> </param> /// <param name="sqlGenerator"> </param> public 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> // We delegate the writing of the fragment to the appropriate type. // </summary> public 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(); } } } } }
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 (var outerExtent in outerExtents.Keys) { var joinSymbol = outerExtent as JoinSymbol; if (joinSymbol != null) { foreach (var 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. var extentList = AllJoinExtents ?? fromExtents; if (null != extentList) { foreach (var fromAlias in extentList) { if ((null != outerExtentAliases) && outerExtentAliases.Contains(fromAlias.Name)) { var i = sqlGenerator.AllExtentNames[fromAlias.Name]; string newName; do { ++i; newName = fromAlias.Name + i.ToString(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 += 1; // ++ can be confusing in this context writer.Write("SELECT "); if (IsDistinct) { writer.Write("DISTINCT "); } if (Top != null && Skip == null) // This is simple TOP case. There is no OFFSET. { Top.WriteSql(writer, sqlGenerator); } if ((null == @select) || Select.IsEmpty) { Debug.Assert(false); // we have removed all possibilities of SELECT *. writer.Write("*"); } else { Select.WriteSql(writer, sqlGenerator); } writer.WriteLine(); writer.Write("FROM "); From.WriteSql(writer, sqlGenerator); if ((null != @where) && !Where.IsEmpty) { writer.WriteLine(); writer.Write("WHERE "); Where.WriteSql(writer, sqlGenerator); } if ((null != groupBy) && !GroupBy.IsEmpty) { writer.WriteLine(); writer.Write("GROUP BY "); GroupBy.WriteSql(writer, sqlGenerator); } if ((null != orderBy) && !OrderBy.IsEmpty && (IsTopMost || Top != null || Skip != null)) { writer.WriteLine(); writer.Write("ORDER BY "); OrderBy.WriteSql(writer, sqlGenerator); } if (null != Skip) { writer.WriteLine(); WriteOffsetFetch(writer, Top, Skip, sqlGenerator); // Write OFFSET, FETCH clause. } --writer.Indent; }
// This function generates OFFSET, FETCH clause from Top and Skip information. // Note that this should be used only when Skip is present. For only Top, TopClause.WriteSql() // private static void WriteOffsetFetch(SqlWriter writer, TopClause top, SkipClause skip, SqlGenerator sqlGenerator) { DebugCheck.NotNull(skip); skip.WriteSql(writer, sqlGenerator); if (top != null) { writer.Write("FETCH NEXT "); top.TopCount.WriteSql(writer, sqlGenerator); writer.Write(" ROWS ONLY"); writer.Write(" "); } }
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 (var outerExtent in outerExtents.Keys) { var joinSymbol = outerExtent as JoinSymbol; if (joinSymbol != null) { foreach (var 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. var extentList = AllJoinExtents ?? fromExtents; if (null != extentList) { foreach (var fromAlias in extentList) { if ((null != outerExtentAliases) && outerExtentAliases.Contains(fromAlias.Name)) { var i = sqlGenerator.AllExtentNames[fromAlias.Name]; string newName; do { ++i; newName = fromAlias.Name + i.ToString(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 += 1; // ++ can be confusing in this context writer.Write("SELECT "); if (IsDistinct) { writer.Write("DISTINCT "); } if (Top != null && Skip == null) // This is simple TOP case. There is no OFFSET. { Top.WriteSql(writer, sqlGenerator); } if ((null == @select) || Select.IsEmpty) { Debug.Assert(false); // we have removed all possibilities of SELECT *. writer.Write("*"); } else { Select.WriteSql(writer, sqlGenerator); } writer.WriteLine(); writer.Write("FROM "); From.WriteSql(writer, sqlGenerator); if ((null != @where) && !Where.IsEmpty) { writer.WriteLine(); writer.Write("WHERE "); Where.WriteSql(writer, sqlGenerator); } if ((null != groupBy) && !GroupBy.IsEmpty) { writer.WriteLine(); writer.Write("GROUP BY "); GroupBy.WriteSql(writer, sqlGenerator); } if ((null != orderBy) && !OrderBy.IsEmpty && (IsTopMost || Top != null || Skip != null)) { writer.WriteLine(); writer.Write("ORDER BY "); OrderBy.WriteSql(writer, sqlGenerator); } if (null != Skip) { writer.WriteLine(); WriteOffsetFetch(writer, Top, Skip, sqlGenerator); // Write OFFSET, FETCH clause. } --writer.Indent; }
/// <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)); }