Обсуждение: Getting Reference cursors

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Getting Reference cursors

От
Andrés Luna
Дата:
Hi guys
 
Im using the JDBC driver to connect to a Postgres Database. I have a function that returns a reference cursor and it works ok returning result itself. However, whenever I try to use the result set meta data of the ref cursor it doesn't work. Let me explain better:
// procedure call
CallableStatement proc = con.prepareCall("{ ? = call doquery ( ? ) }");
proc.registerOutParameter(1, Types.Other);
proc.setInt(2, -1);
proc.execute();
ResultSet results = (ResultSet) proc.getObject(1); //this the ref. cursor
ResultSetMetaData rm = results.getMetaData(); //result set meta data of the ref. cursor
System.out.println(rm); //prints the reference of the object so it is not null
int columnCount = rm.getColumnCount() //NullPointerException :(
results.close();
proc.close();
 
The rm object in this code is not null. However, the internall data of it, such as column counts and column names is null. Am I doing something wrong ? Is it possible to obtain the result set meta data from a Reference cursor returned from an function. If not, how do you get the column names ??
 
The driver version im using is : pg74.216.jdbc3.jar
 
Tks in advance for any help !!
 
 
 
ANDRES LUNA TAMAYO
Software Developer
IFX NETWORKS
(571) 3693000
 
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Re: Getting Reference cursors

От
Kris Jurka
Дата:

On Fri, 10 Jun 2005, [iso-8859-1] Andr�s Luna wrote:

> Im using the JDBC driver to connect to a Postgres Database. I have a
> function that returns a reference cursor and it works ok returning
> result itself. However, whenever I try to use the result set meta data
> of the ref cursor it doesn't work. Let me explain better:

This is fixed in the 8.0 driver.

Kris Jurka

Re: Getting Reference cursors

От
Andrés Luna
Дата:
Kris

Thanks for your quick answer. However, now I change to the 8.0 driver
and still doesn´t work. The same code now fails during stored procedure
execution. Here is the stack trace.

java.sql.SQLException: ERROR: cursor "<unnamed portal 1>" does not exist
    at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecu
torImpl.java:1471)
    at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImp
l.java:1256)
    at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:
175)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Stateme
nt.java:389)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdb
c2Statement.java:314)
    at
org.postgresql.jdbc2.AbstractJdbc2Connection.execSQLQuery(AbstractJdbc2C
onnection.java:192)
    at
org.postgresql.jdbc2.AbstractJdbc2ResultSet.internalGetObject(AbstractJd
bc2ResultSet.java:165)
    at
org.postgresql.jdbc2.AbstractJdbc2ResultSet.getObject(AbstractJdbc2Resul
tSet.java:2328)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdb
c2Statement.java:342)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Stateme
nt.java:321)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:324)
    at
org.postgresql.ds.common.PooledConnectionImpl$StatementHandler.invoke(Po
oledConnectionImpl.java:467)
    at $Proxy1.execute(Unknown Source)
    ...

Tks in advance!

-----Mensaje original-----
De: Kris Jurka [mailto:books@ejurka.com]
Enviado el: domingo, 12 de junio de 2005 1:07
Para: Andrés Luna
CC: pgsql-jdbc@postgresql.org
Asunto: Re: [JDBC] Getting Reference cursors




On Fri, 10 Jun 2005, [iso-8859-1] Andrés Luna wrote:

> Im using the JDBC driver to connect to a Postgres Database. I have a
> function that returns a reference cursor and it works ok returning
> result itself. However, whenever I try to use the result set meta data

> of the ref cursor it doesn't work. Let me explain better:

This is fixed in the 8.0 driver.

Kris Jurka

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--
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Checked by AVG Anti-Virus.
Version: 7.0.323 / Virus Database: 267.6.9 - Release Date: 11/06/2005

Re: Getting Reference cursors

От
Kris Jurka
Дата:

On Mon, 13 Jun 2005, [iso-8859-1] Andr�s Luna wrote:

> Thanks for your quick answer. However, now I change to the 8.0 driver
> and still doesn�t work. The same code now fails during stored procedure
> execution. Here is the stack trace.
>
> java.sql.SQLException: ERROR: cursor "<unnamed portal 1>" does not exist

I'm not sure why this is happening, perhaps you have autocommit on?
Although that should have caused a failure with the 7.4 driver as well.
I've attached the test case I used to verify this works.  Could you show
us the code that is failing here?

Kris Jurka
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