Обсуждение: Mismatched JDBC and Java Type

I am using a short (Short) in my application for a particular data field
My understanding is that this should map to the JDBC type 'smallInt' which
in turn maps to the postgresql type int2.

However when I retrieve data via JDBC (jdbc7.0-1.2.jar, 7.0.3-2 engine)
the int2 fields are returned as java.lang.Integer instead of java.lang.Short.

Is this a bug?

----------- Example code below ----------
    ResultSetMetaData md = rs.getMetaData();
    while (rs.next()) {
        for (int c=1; c <= md.getColumnCount(); c++) {
            Object obj = rs.getObject(c);
            Logger.println(c +
                           "\tcolumnName=" + md.getColumnName(c) +
                           "\tcolumnType=" + md.getColumnType(c) +
                           "\tcolumnTypeName=" + md.getColumnTypeName(c) +
                           "\tvalue=" + obj +
                           "\tvalueClass=" + obj.getClass().getName() );


will produce

...
10 columnName=active  columnType=5  columnTypeName=int2  value=8
valueClass=java.lang.Integer
...

note that md.getColumnClassName() is not implemented so I don't know what it
would return.

===================
Mike Finn
Tactical Executive Systems
mike.finn@tacticalExecutive.com

At 11:45 27/04/01 -0600, Mike Finn wrote:
>I am using a short (Short) in my application for a particular data field
>My understanding is that this should map to the JDBC type 'smallInt' which
>in turn maps to the postgresql type int2.
>
>However when I retrieve data via JDBC (jdbc7.0-1.2.jar, 7.0.3-2 engine)
>the int2 fields are returned as java.lang.Integer instead of java.lang.Short.


Possibly, but it depends on how the JDBC driver is seeing it. It should see
int2 as Short.

Peter


>note that md.getColumnClassName() is not implemented so I don't know what it
>would return.

Hmm, I'l check 7.1, as I thought it was implemented now...

Peter