public void Remove(InputFragment fragment)
{
if (fragment == null)
{
return;
}
if (fragment.Name != null)
{
scopeTable.Remove(fragment.Name);
}
if (fragment is SelectStatement)
{
Remove((fragment as SelectStatement).From);
}
else if (fragment is JoinFragment)
{
JoinFragment j = fragment as JoinFragment;
Remove(j.Left);
Remove(j.Right);
}
else if (fragment is UnionFragment)
{
UnionFragment u = fragment as UnionFragment;
Remove(u.Left);
Remove(u.Right);
}
}
public override SqlFragment Visit(DbPropertyExpression expression)
{
propertyLevel++;
PropertyFragment fragment = expression.Instance.Accept(this) as PropertyFragment;
fragment.Properties.Add(expression.Property.Name);
propertyLevel--;
// if we are not at the top level property then just return
if (propertyLevel > 0)
{
return(fragment);
}
ColumnFragment column = new ColumnFragment(null, fragment.LastProperty);
column.PropertyFragment = fragment;
InputFragment input = scope.FindInputFromProperties(fragment);
if (input != null)
{
column.TableName = input.Name;
}
// now we need to check if our column name was possibly renamed
if (input is TableFragment)
{
return(column);
}
SelectStatement select = input as SelectStatement;
UnionFragment union = input as UnionFragment;
if (select != null)
{
select.HasDifferentNameForColumn(column);
}
else if (union != null)
{
union.HasDifferentNameForColumn(column);
}
// input is a table, selectstatement, or unionstatement
return(column);
}
public override SqlFragment Visit(DbUnionAllExpression expression)
{
UnionFragment f = new UnionFragment();
Debug.Assert(expression.Left is DbProjectExpression);
Debug.Assert(expression.Right is DbProjectExpression);
SelectStatement left = VisitInputExpressionEnsureSelect(expression.Left, null, null);
Debug.Assert(left.Name == null);
// left.Wrap(null);
SelectStatement right = VisitInputExpressionEnsureSelect(expression.Right, null, null);
Debug.Assert(right.Name == null);
// right.Wrap(null);
f.Left = left;
f.Right = right;
return(f);
}
public override SqlFragment Visit(DbUnionAllExpression expression)
{
UnionFragment f = new UnionFragment();
Debug.Assert(expression.Left is DbProjectExpression);
Debug.Assert(expression.Right is DbProjectExpression);
SelectStatement left = VisitInputExpressionEnsureSelect(expression.Left, null, null);
Debug.Assert(left.Name == null);
// left.Wrap(null);
SelectStatement right = VisitInputExpressionEnsureSelect(expression.Right, null, null);
Debug.Assert(right.Name == null);
// right.Wrap(null);
f.Left = left;
f.Right = right;
return f;
}
