Обсуждение: Expressiveness of SQLException

Hello dear developers,

I wrote a function for the server, that rises this error when called
(called and displayed in PGAdmin III):

    ERROR: value too long for type character varying(255)
    SQL Status:22001
    Kontext:PL/pgSQL function "fkt_calculateshoppinglistitems" line 26
at assignment
    PL/pgSQL function "fkt_calculateallshoppinglistitems" line 16 at FOR
over SELECT rows

When this function is called by JDBC, the only information stored in the
exception is:

     ERROR: value too long for type character varying(255)

Which makes debugging from server logfiles much harder. I expected to
have some more exceptions encapsulated (retrievable with
getNextException on PSQLException), but found nothing.

Where do I have to look for the missing information?

With best regards,
Daniel Migowski

Daniel Migowski wrote:

> When this function is called by JDBC, the only information stored in the
> exception is:
>
>     ERROR: value too long for type character varying(255)
>
> Which makes debugging from server logfiles much harder. I expected to
> have some more exceptions encapsulated (retrievable with
> getNextException on PSQLException), but found nothing.

http://java.sun.com/j2se/1.4.2/docs/api/java/sql/SQLException.html#getErrorCode()
http://java.sun.com/j2se/1.4.2/docs/api/java/sql/SQLException.html#getSQLState()

--
Craig Ringer

Daniel Migowski wrote:

> Where do I have to look for the missing information?

The driver extension
org.postgresql.util.PSQLException.getServerErrorMessage() lets you get
at all the fields of a server-generated exception.

-o

Thank you for your responses. Sadly, they don't help me (with PG 8.3 and
the JDBC-3-Driver).

This is my SQL:

CREATE OR REPLACE FUNCTION fail() RETURNS int4 AS
$BODY$ BEGIN RAISE  exception 'FAIL'; return null; END; $BODY$ LANGUAGE
'plpgsql';

CREATE OR REPLACE FUNCTION fail2()RETURNS int4 AS
$BODY$ BEGIN select fail(); return null; END; $BODY$ LANGUAGE 'plpgsql';

select fail2();

And this the result:

ERROR: FAIL
SQL Status:P0001
Kontext:SQL statement "select fail()"
PL/pgSQL function "fail2" line 1 at SQL statement

Now when called from Java:

        try {
            ResultSet r = stmt.executeQuery("select fail2();");
            JdbcUtils.dumpResultSet(r);
        } catch (SQLException e) {
            e.printStackTrace();
            PSQLException ex = (PSQLException)e;
            System.err.println(ex.getServerErrorMessage());
            System.err.println(ex.getSQLState());
            System.err.println(ex.getErrorCode());
            System.err.println(ex.getNextException());
            System.err.println(ex.getCause());
        }

I get this result:

org.postgresql.util.PSQLException: ERROR: function fail2() does not exist
    at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1559)
    at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1327)
    at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:192)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:451)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:336)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:235)
    at de.ikoffice.jdbc.JdbcExceptionsTest.main(JdbcExceptionsTest.java:24)
ERROR: function fail2() does not exist
42883
0
null
null

where is no more information from the functions you proposed. Is this a bug?

With best regards,
Daniel Migowski

Daniel Migowski wrote:

>            System.err.println(ex.getServerErrorMessage());

getServerErrorMessage() returns an object you can query for further details.

-O

Hallo Oliver,

Oliver Jowett schrieb:
> getServerErrorMessage() returns an object you can query for further
> details.
Oh, sorry, I totally overlooked that... this will solve it.

Thank you very much!
Daniel Migowski