internal override SqlSelect VisitSelect(SqlSelect select) { bool saveTop = this.topSelect; bool savePK = this.addPrimaryKeys; SqlSelect saveSelect = this.currentSelect; this.currentSelect = select; if (select.OrderingType == SqlOrderingType.Always) { this.addPrimaryKeys = true; } this.topSelect = false; // can't forward ordering information through a group-by if (select.GroupBy.Count > 0) { this.Visit(select.From); this.orders = null; } else { this.Visit(select.From); } if (select.OrderBy.Count > 0) { this.PrependOrderExpressions(select.OrderBy); } List<SqlOrderExpression> save = this.orders; this.orders = null; this.rowNumberOrders = save; // lest orders be null when we need info /* do all the lower level stuff */ select.Where = this.VisitExpression(select.Where); for (int i = 0, n = select.GroupBy.Count; i < n; i++) { select.GroupBy[i] = this.VisitExpression(select.GroupBy[i]); } select.Having = this.VisitExpression(select.Having); for (int i = 0, n = select.OrderBy.Count; i < n; i++) { select.OrderBy[i].Expression = this.VisitExpression(select.OrderBy[i].Expression); } select.Top = this.VisitExpression(select.Top); select.Selection = this.VisitExpression(select.Selection); select.Row = (SqlRow)this.Visit(select.Row); this.topSelect = saveTop; this.addPrimaryKeys = savePK; this.orders = save; // all ordering is blocked for this layer and above if (select.OrderingType == SqlOrderingType.Blocked) { this.orders = null; } // rebuild orderby expressions, provided this select doesn't contain a SqlRowNumber // otherwise, replace the orderby with a reference to that column select.OrderBy.Clear(); var rowNumberChecker = new SqlRowNumberChecker(); if (rowNumberChecker.HasRowNumber(select) && rowNumberChecker.RowNumberColumn != null) { select.Row.Columns.Remove(rowNumberChecker.RowNumberColumn); this.PushDown(rowNumberChecker.RowNumberColumn); this.Orders.Add(new SqlOrderExpression(SqlOrderType.Ascending, new SqlColumnRef(rowNumberChecker.RowNumberColumn))); } if ((this.topSelect || select.Top != null) && select.OrderingType != SqlOrderingType.Never && this.orders != null) { this.orders = new HashSet<SqlOrderExpression>(this.orders).ToList(); SqlDuplicator dup = new SqlDuplicator(true); foreach (SqlOrderExpression sox in this.orders) { select.OrderBy.Add(new SqlOrderExpression(sox.OrderType, (SqlExpression)dup.Duplicate(sox.Expression))); } } this.currentSelect = saveSelect; return select; }
internal Lifter(TypeSystemProvider typeProvider, MetaModel model) { this.sql = new SqlFactory(typeProvider, model); this.aggregateChecker = new SqlAggregateChecker(); this.rowNumberChecker = new SqlRowNumberChecker(); }
internal Lifter(TypeSystemProvider typeProvider, MetaModel model) { this.sql = new SqlFactory(typeProvider, model); this.aggregateChecker = new SqlAggregateChecker(); this.rowNumberChecker = new SqlRowNumberChecker(); }
internal override SqlSelect VisitSelect(SqlSelect select) { bool saveTop = this.topSelect; bool savePK = this.addPrimaryKeys; SqlSelect saveSelect = this.currentSelect; this.currentSelect = select; if (select.OrderingType == SqlOrderingType.Always) { this.addPrimaryKeys = true; } this.topSelect = false; // can't forward ordering information through a group-by if (select.GroupBy.Count > 0) { this.Visit(select.From); this.orders = null; } else { this.Visit(select.From); } if (select.OrderBy.Count > 0) { this.PrependOrderExpressions(select.OrderBy); } List <SqlOrderExpression> save = this.orders; this.orders = null; this.rowNumberOrders = save; // lest orders be null when we need info /* do all the lower level stuff */ select.Where = this.VisitExpression(select.Where); for (int i = 0, n = select.GroupBy.Count; i < n; i++) { select.GroupBy[i] = this.VisitExpression(select.GroupBy[i]); } select.Having = this.VisitExpression(select.Having); for (int i = 0, n = select.OrderBy.Count; i < n; i++) { select.OrderBy[i].Expression = this.VisitExpression(select.OrderBy[i].Expression); } select.Top = this.VisitExpression(select.Top); select.Selection = this.VisitExpression(select.Selection); select.Row = (SqlRow)this.Visit(select.Row); this.topSelect = saveTop; this.addPrimaryKeys = savePK; this.orders = save; // all ordering is blocked for this layer and above if (select.OrderingType == SqlOrderingType.Blocked) { this.orders = null; } // rebuild orderby expressions, provided this select doesn't contain a SqlRowNumber // otherwise, replace the orderby with a reference to that column select.OrderBy.Clear(); var rowNumberChecker = new SqlRowNumberChecker(); if (rowNumberChecker.HasRowNumber(select) && rowNumberChecker.RowNumberColumn != null) { select.Row.Columns.Remove(rowNumberChecker.RowNumberColumn); this.PushDown(rowNumberChecker.RowNumberColumn); this.Orders.Add(new SqlOrderExpression(SqlOrderType.Ascending, new SqlColumnRef(rowNumberChecker.RowNumberColumn))); } if ((this.topSelect || select.Top != null) && select.OrderingType != SqlOrderingType.Never && this.orders != null) { this.orders = new HashSet <SqlOrderExpression>(this.orders).ToList(); SqlDuplicator dup = new SqlDuplicator(true); foreach (SqlOrderExpression sox in this.orders) { select.OrderBy.Add(new SqlOrderExpression(sox.OrderType, (SqlExpression)dup.Duplicate(sox.Expression))); } } this.currentSelect = saveSelect; return(select); }