Open okennedy opened 7 years ago
A table-valued function is used like a function but is implemented by a virtual table.
So the driver must support at least read-only virtual table (sqlite3_module
, sqlite3_vtab
and sqlite3_vtab_cursor
).
Thanks!
A virtual table would be sufficient for my purposes as well. It seems like the jdbc driver can make use of vtables, but only those defined by an extension.
Indeed, the driver can load/use C extension containing virtual table implementation(s) but you can't implement virtual table in Java. If you want to use an existing table-valued function, you can already do that with: http://sqlite.org/lang_corefunc.html#load_extension
SELECT load_extension('path to the dll');
SELECT value FROM table_valued_func();
Agreed this would be pretty useful. I have a case where a query needs to extract the bounds of a polygon, minx,miny,maxx,maxy, for r-tree insertion, and it's round tripping 4 times back to Java to call 4 separate functions, where one round trip would be sufficient... but to do that, I understand table valued functions would be required.
First off, thanks for a great piece of software.
SQLite now supports Table-Valued functions. Is there any possibility of the JDBC driver getting an interface for these in the same vein as
Function
orFunction.Aggregate
.