internal SetOperatorExpression(SetOperator @operator, SourceWithAliasExpression left, SourceWithAliasExpression right, Alias alias)
: base(DbExpressionType.SetOperator, alias)
{
this.Operator = @operator;
this.Left = Validate(left, nameof(left));
this.Right = Validate(right, nameof(right));
}
public InsertSelectExpression(ITable table, bool useHistoryTable, SourceWithAliasExpression source, IEnumerable <ColumnAssignment> assigments)
: base(DbExpressionType.InsertSelect)
{
this.Table = table;
this.UseHistoryTable = useHistoryTable;
this.Assigments = assigments.ToReadOnly();
this.Source = source;
}
private SourceWithAliasExpression VisitSetOperatorPart(SourceWithAliasExpression part, List <ColumnExpression> askedColumns)
{
using (NewScope())
{
CurrentScope.AddRange(askedColumns.ToDictionary(c => new ColumnExpression(c.Type, part.Alias, c.Name), c => (ColumnExpression?)null));
return((SourceWithAliasExpression)Visit(part));
}
}
public DeleteExpression(ITable table, bool useHistoryTable, SourceWithAliasExpression source, Expression?where)
: base(DbExpressionType.Delete)
{
this.Table = table;
this.UseHistoryTable = useHistoryTable;
this.Source = source;
this.Where = where;
}
public UpdateExpression(ITable table, bool useHistoryTable, SourceWithAliasExpression source, Expression where, IEnumerable <ColumnAssignment> assigments)
: base(DbExpressionType.Update)
{
this.Table = table;
this.UseHistoryTable = useHistoryTable;
this.Assigments = assigments.ToReadOnly();
this.Source = source;
this.Where = where;
}
protected internal virtual Expression VisitSetOperator(SetOperatorExpression set)
{
SourceWithAliasExpression left = (SourceWithAliasExpression)this.VisitSource(set.Left) !;
SourceWithAliasExpression right = (SourceWithAliasExpression)this.VisitSource(set.Right) !;
if (left != set.Left || right != set.Right)
{
return(new SetOperatorExpression(set.Operator, left, right, set.Alias));
}
return(set);
}
protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
SourceWithAliasExpression left = (SourceWithAliasExpression)this.VisitSource(set.Left) !;
SourceWithAliasExpression right = (SourceWithAliasExpression)this.VisitSource(set.Right) !;
Alias newAlias = aliasMap.TryGetC(set.Alias) ?? set.Alias;
if (left != set.Left || right != set.Right || newAlias != set.Alias)
{
return(new SetOperatorExpression(set.Operator, left, right, newAlias));
}
return(set);
}
static SourceWithAliasExpression Validate(SourceWithAliasExpression exp, string name)
{
if (exp == null)
{
throw new ArgumentNullException(name);
}
if (exp is TableExpression || exp is SqlTableValuedFunctionExpression)
{
throw new ArgumentException($"{name} should not be a {exp.GetType().Name}");
}
return(exp);
}
protected internal override Expression VisitSetOperator(SetOperatorExpression set)
{
List <ColumnExpression> askedColumns = CurrentScope.Keys.Where(k => k.Alias == set.Alias).ToList();
SourceWithAliasExpression left = VisitSetOperatorPart(set.Left, askedColumns);
SourceWithAliasExpression right = VisitSetOperatorPart(set.Right, askedColumns);
CurrentScope.SetRange(askedColumns, askedColumns);
if (left != set.Left || right != set.Right)
{
return(new SetOperatorExpression(set.Operator, left, right, set.Alias));
}
return(set);
}
private SourceWithAliasExpression VisitSetOperatorPart(SourceWithAliasExpression part, List<ColumnExpression> askedColumns)
{
using (NewScope())
{
CurrentScope.AddRange(askedColumns.ToDictionary(c => new ColumnExpression(c.Type, part.Alias, c.Name), c => (Expression)null));
return (SourceWithAliasExpression)Visit(part);
}
}
void VisitSetPart(SourceWithAliasExpression source)
{
if (source is SelectExpression)
{
this.Indent(Indentation.Inner);
VisitSelect((SelectExpression)source);
this.Indent(Indentation.Outer);
}
else if (source is SetOperatorExpression)
{
VisitSetOperator((SetOperatorExpression)source);
}
else
throw new InvalidOperationException("{0} not expected in SetOperatorExpression".Formato(source.NiceToString()));
}
