Hi Noel,
Am Freitag, 27. Juni 2014 17:06:19 UTC+2 schrieb Noel Grandin:
>
> On Fri, Jun 27, 2014 at 4:48 PM, Lukas Eder <[email protected]
> <javascript:>> wrote:
> > - What exactly is the difference between org.h2.api.AggregateFunction
> and
> > org.h2.api.Aggregate? I don't really see the point of this distinction.
>
> See the comment in the JavaDoc for AggregateFunction:
>
> "Please note this interface only has limited support for data types.
> If you need data types that don't have a corresponding SQL type (for
> example GEOMETRY), then use the {@link Aggregate} interface"
>
I've seen that Javadoc remark. Let me explain my confusion a bit more:
// This API has only *limited* support for data types:
public interface AggregateFunction {
void init(Connection conn) throws SQLException;
int getType(int[] inputTypes) throws SQLException;
void add(Object value) throws SQLException;
Object getResult() throws SQLException;
}
// This API can handle all sorts of data types:
public interface Aggregate {
void init(Connection conn) throws SQLException;
int getInternalType(int[] inputTypes) throws SQLException;
void add(Object value) throws SQLException;
Object getResult() throws SQLException;
}
The whole difference in how these interfaces seem work is essentially
contained in the fact that one interface calls the second method "getType",
whereas the other calls it "getInternalType"
But I get it now. Interestingly, the "internal types" do not extend the
JDBC type numbers, fair enough.
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