Обсуждение: Re: Simple bug in JDBC interface
Peter, can you please comment on this?
>
> Sorry if I'm e-mailing the wrong person.
>
> This is to do with loading "exotic types" through JDBC.
>
> It has to do with how it tries to load the class: (perhaps under old
> hierarchy?)
> postgresql.geometric.PGpoint
> when in fact it SHOULD be loading
> ORG.postgresql.geometric.PGpoint
> ^^^
>
> ///// EXAMPLE:
>
> import java.io.*;
> import java.sql.*;
>
> /*
> This error:
>
> Failed to create object for point java.lang.ClassNotFoundException:
> postgresql.geometric.PGpoint
> at java.lang.Throwable.fillInStackTrace(Native Method)
> at java.lang.Throwable.<init>(Throwable.java:82)
> at java.lang.Exception.<init>(Exception.java:33)
> at java.sql.SQLException.<init>(SQLException.java:98)
> at
> org.postgresql.util.PSQLException.<init>(PSQLException.java:53)
> at org.postgresql.Connection.getObject(Connection.java:624)
> at org.postgresql.jdbc2.ResultSet.getObject(ResultSet.java:741)
> at PostgresTest.<init>(PostgresTest.java:23)
> at PostgresTest.main(PostgresTest.java:31)
>
>
> in psql:
>
> testdb=# \d users
> minid | char(15) |
> status | char(3) |
> location | point |
> */
>
> public class PostgresTest {
>
> public PostgresTest()
> throws Exception
> {
> Class.forName("org.postgresql.Driver");
> Connection c =
> DriverManager.getConnection("jdbc:postgresql://beryl:5432/testdb",
> "postgres", "");
> Statement s = c.createStatement();
> BufferedReader r = new BufferedReader(new
> InputStreamReader(System.in));
> // while (true) {
> // System.out.print("Enter query: ");
> // System.out.flush();
> String query;
> //query = r.readLine();
> query = "select * from users";
> ResultSet res = s.executeQuery(query);
> if (res != null) {
> while (res.next()) {
> System.out.println("" +
> res.getString(1) + " " + res.getString(2) + " " + res.getObject(3));
> }
> }
> //}
> }
>
> public static void main(String args[]) {
> try {
> PostgresTest pt = new PostgresTest();
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
>
> }
>
-- Bruce Momjian | http://www.op.net/~candle pgman@candle.pha.pa.us | (610)
853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill,
Pennsylvania19026
On Fri, 2 Jun 2000, Bruce Momjian wrote:
> Peter, can you please comment on this?
I'll check. It may be that org. is being missed off somewhere (although
when I did a grep to check that all references to postgresql were prefixed
with org. I didn't find any).
PS: On another subject, I've found the errant DataSource class, but I'm
having problems with cvs (postgresql.org doesn't like my password).
I'll check on this as soon as I get cvs working.
Peter
> > Sorry if I'm e-mailing the wrong person.
> >
> > This is to do with loading "exotic types" through JDBC.
> >
> > It has to do with how it tries to load the class: (perhaps under old
> > hierarchy?)
> > postgresql.geometric.PGpoint
> > when in fact it SHOULD be loading
> > ORG.postgresql.geometric.PGpoint
> > ^^^
> >
> > ///// EXAMPLE:
> >
> > import java.io.*;
> > import java.sql.*;
> >
> > /*
> > This error:
> >
> > Failed to create object for point java.lang.ClassNotFoundException:
> > postgresql.geometric.PGpoint
> > at java.lang.Throwable.fillInStackTrace(Native Method)
> > at java.lang.Throwable.<init>(Throwable.java:82)
> > at java.lang.Exception.<init>(Exception.java:33)
> > at java.sql.SQLException.<init>(SQLException.java:98)
> > at
> > org.postgresql.util.PSQLException.<init>(PSQLException.java:53)
> > at org.postgresql.Connection.getObject(Connection.java:624)
> > at org.postgresql.jdbc2.ResultSet.getObject(ResultSet.java:741)
> > at PostgresTest.<init>(PostgresTest.java:23)
> > at PostgresTest.main(PostgresTest.java:31)
> >
> >
> > in psql:
> >
> > testdb=# \d users
> > minid | char(15) |
> > status | char(3) |
> > location | point |
> > */
> >
> > public class PostgresTest {
> >
> > public PostgresTest()
> > throws Exception
> > {
> > Class.forName("org.postgresql.Driver");
> > Connection c =
> > DriverManager.getConnection("jdbc:postgresql://beryl:5432/testdb",
> > "postgres", "");
> > Statement s = c.createStatement();
> > BufferedReader r = new BufferedReader(new
> > InputStreamReader(System.in));
> > // while (true) {
> > // System.out.print("Enter query: ");
> > // System.out.flush();
> > String query;
> > //query = r.readLine();
> > query = "select * from users";
> > ResultSet res = s.executeQuery(query);
> > if (res != null) {
> > while (res.next()) {
> > System.out.println("" +
> > res.getString(1) + " " + res.getString(2) + " " + res.getObject(3));
> > }
> > }
> > //}
> > }
> >
> > public static void main(String args[]) {
> > try {
> > PostgresTest pt = new PostgresTest();
> > } catch (Exception e) {
> > e.printStackTrace();
> > }
> > }
> >
> > }
> >
>
>
> --
> Bruce Momjian | http://www.op.net/~candle
> pgman@candle.pha.pa.us | (610) 853-3000
> + If your life is a hard drive, | 830 Blythe Avenue
> + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
>
-- Peter T Mount peter@retep.org.uk Main Homepage: http://www.retep.org.uk
PostgreSQL JDBC Faq: http://www.retep.org.uk/postgresJava PDF Generator: http://www.retep.org.uk/pdf