Thread: getIndexInfo() fails

getIndexInfo() fails

From
Matthias Jordan
Date:
Hi, folks!

I try to use the above method in a project to find out whether
an index has to be created or not.

 ResultSet rs = dbInfo.getIndexInfo(null, null, tableName,false, true);

What really drives me nuts is that the ResultSet is always
empty. I even tried it the hard way and nested four for loops
that cycled through possible arguments ( null, "", "%" for
the strings and true and false for the booleans) and even tried
to use the indexName instead of the tableName. Nothing. It also
doesn't matter which JDBC version I use (currently, it's
jdbc7.1-1.2.jar for PostgreSQL 7.1.2 and J2SDK1.3). I
double-checked the table name I pass and the table in question
really has an index associated to it (that's what psql says).

Any idea what could go wrong here?

Thanks in advance.
Matthias
--
PADDLE-PG


Re: getIndexInfo() fails

From
"Dave Cramer"
Date:
Matthias,

Try using the latest jar from jdbc.postgresql.org I am pretty sure there
were a lot of changes in that section of the driver.

Dave

-----Original Message-----
From: pgsql-jdbc-owner@postgresql.org
[mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Matthias Jordan
Sent: Wednesday, January 30, 2002 9:24 AM
To: pgsql-jdbc@postgresql.org
Subject: [JDBC] getIndexInfo() fails


Hi, folks!

I try to use the above method in a project to find out whether an index
has to be created or not.

 ResultSet rs = dbInfo.getIndexInfo(null, null, tableName,false, true);

What really drives me nuts is that the ResultSet is always empty. I even
tried it the hard way and nested four for loops that cycled through
possible arguments ( null, "", "%" for the strings and true and false
for the booleans) and even tried to use the indexName instead of the
tableName. Nothing. It also doesn't matter which JDBC version I use
(currently, it's jdbc7.1-1.2.jar for PostgreSQL 7.1.2 and J2SDK1.3). I
double-checked the table name I pass and the table in question really
has an index associated to it (that's what psql says).

Any idea what could go wrong here?

Thanks in advance.
Matthias
--
PADDLE-PG


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tomcat update

From
tony
Date:
Update on my problem - yes it was "grant" on some of the tables that was
stopping me from writing to them!

Now I just have to get the Macintosh clients happy with the machine's
address and convince the ftp server to let the tomcat user connect to
the JSP folder...

Cheers

Tony

--
RedHat Linux on Sony Vaio C1XD/S
http://www.animaproductions.com/linux2.html
Macromedia UltraDev with PostgreSQL
http://www.animaproductions.com/ultra.html


getIndexInfo() throws NullPointerException

From
"Cormac Twomey"
Date:
Calling getIndexInfo against a postgresql-7.1 db with the 7.2 jdbc driver (or with 7.3dev built 2002-02-09 ), I get the
following
exception:

Exception in thread "main" java.lang.NullPointerException
        at org.postgresql.jdbc2.ResultSet.getBytes(Unknown source)
        at org.postgresql.jdbc2.DatabaseMetaData.getIndexInfo(Unknown source)
        at foo.bar(foo.java:253)
        at foo.baz(foo.java:167)
        at foo.main(foo.java:46)

I decided to poke around in the source code and found the following piece of questionable-looking code in
org/postgresql/jdbc2/DatabaseMetaData.jar:

...
    if (columnNameRS.next())
        tuple[8] = columnNameRS.getBytes(1);
    else
        tuple[8] = "".getBytes();
    tuple[8] = columnNameRS.getBytes(1);
...

Now, being willing to bet that that last line shouldn't be there, I commented it out and tried it again - and bingo! it
workedfine. 

I see Dave Cramer's uid at the top of DatabaseMetaData.jar, so cc'ing him.

Thanks,
--Cormac Twomey


Re: getIndexInfo() throws NullPointerException

From
"Dave Cramer"
Date:
I'd have to agree with your bet, thanks a lot

Dave

-----Original Message-----
From: Cormac Twomey [mailto:cormac@bpallen.com]
Sent: Monday, February 18, 2002 7:40 PM
To: pgsql-jdbc@postgresql.org; Dave@micro-automation.net
Subject: [JDBC] getIndexInfo() throws NullPointerException


Calling getIndexInfo against a postgresql-7.1 db with the 7.2 jdbc
driver (or with 7.3dev built 2002-02-09 ), I get the following
exception:

Exception in thread "main" java.lang.NullPointerException
        at org.postgresql.jdbc2.ResultSet.getBytes(Unknown source)
        at org.postgresql.jdbc2.DatabaseMetaData.getIndexInfo(Unknown
source)
        at foo.bar(foo.java:253)
        at foo.baz(foo.java:167)
        at foo.main(foo.java:46)

I decided to poke around in the source code and found the following
piece of questionable-looking code in
org/postgresql/jdbc2/DatabaseMetaData.jar:

...
    if (columnNameRS.next())
        tuple[8] = columnNameRS.getBytes(1);
    else
        tuple[8] = "".getBytes();
    tuple[8] = columnNameRS.getBytes(1);
...

Now, being willing to bet that that last line shouldn't be there, I
commented it out and tried it again - and bingo! it worked fine.

I see Dave Cramer's uid at the top of DatabaseMetaData.jar, so cc'ing
him.

Thanks,
--Cormac Twomey



Re: getIndexInfo() throws NullPointerException

From
"Cormac Twomey"
Date:
Ok, I have one further issue, which I'm much less certain of - some of the indexes that I'm trying to obtain info about
are
multi-column indexes, but the resultset for getIndexInfo is only returning the column name of one of those columns. For
theother 
columns, it's returning an empty string.

So, for example, given the following index:

create index foo_abc_idx on foo (a, b, c)

calling getIndexInfo on table foo, will return 3 results (as I expected) but with the following columns:

ORDINAL_POSITION | COLUMN_NAME
------------------------------
1                | c
2                |
3                |

The documentation for this call is sparse enough, so I'm not sure I'm not doing something wrong.... ideas?

Thanks,
--Cormac

----- Original Message -----
From: "Dave Cramer" <Dave@micro-automation.net>
To: "'Cormac Twomey'" <cormac@bpallen.com>; <pgsql-jdbc@postgresql.org>; <Dave@micro-automation.net>
Sent: Monday, February 18, 2002 4:54 PM
Subject: Re: [JDBC] getIndexInfo() throws NullPointerException


> I'd have to agree with your bet, thanks a lot
>
> Dave
>
> -----Original Message-----
> From: Cormac Twomey [mailto:cormac@bpallen.com]
> Sent: Monday, February 18, 2002 7:40 PM
> To: pgsql-jdbc@postgresql.org; Dave@micro-automation.net
> Subject: [JDBC] getIndexInfo() throws NullPointerException
>
>
> Calling getIndexInfo against a postgresql-7.1 db with the 7.2 jdbc
> driver (or with 7.3dev built 2002-02-09 ), I get the following
> exception:
>
> Exception in thread "main" java.lang.NullPointerException
>         at org.postgresql.jdbc2.ResultSet.getBytes(Unknown source)
>         at org.postgresql.jdbc2.DatabaseMetaData.getIndexInfo(Unknown
> source)
>         at foo.bar(foo.java:253)
>         at foo.baz(foo.java:167)
>         at foo.main(foo.java:46)
>
> I decided to poke around in the source code and found the following
> piece of questionable-looking code in
> org/postgresql/jdbc2/DatabaseMetaData.jar:
>
> ...
>     if (columnNameRS.next())
>         tuple[8] = columnNameRS.getBytes(1);
>     else
>         tuple[8] = "".getBytes();
>     tuple[8] = columnNameRS.getBytes(1);
> ...
>
> Now, being willing to bet that that last line shouldn't be there, I
> commented it out and tried it again - and bingo! it worked fine.
>
> I see Dave Cramer's uid at the top of DatabaseMetaData.jar, so cc'ing
> him.
>
> Thanks,
> --Cormac Twomey
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>


Re: getIndexInfo() throws NullPointerException

From
"Dave Cramer"
Date:
All this stuff is fairly new, so there are probably bugs in it, I will
have a look at it.

I suspect nobody ever tried multiple index's on a table

Dave

-----Original Message-----
From: pgsql-jdbc-owner@postgresql.org
[mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Cormac Twomey
Sent: Monday, February 18, 2002 8:51 PM
To: Dave@micro-automation.net; pgsql-jdbc@postgresql.org
Subject: Re: [JDBC] getIndexInfo() throws NullPointerException


Ok, I have one further issue, which I'm much less certain of - some of
the indexes that I'm trying to obtain info about are multi-column
indexes, but the resultset for getIndexInfo is only returning the column
name of one of those columns. For the other columns, it's returning an
empty string.

So, for example, given the following index:

create index foo_abc_idx on foo (a, b, c)

calling getIndexInfo on table foo, will return 3 results (as I expected)
but with the following columns:

ORDINAL_POSITION | COLUMN_NAME
------------------------------
1                | c
2                |
3                |

The documentation for this call is sparse enough, so I'm not sure I'm
not doing something wrong.... ideas?

Thanks,
--Cormac

----- Original Message -----
From: "Dave Cramer" <Dave@micro-automation.net>
To: "'Cormac Twomey'" <cormac@bpallen.com>; <pgsql-jdbc@postgresql.org>;
<Dave@micro-automation.net>
Sent: Monday, February 18, 2002 4:54 PM
Subject: Re: [JDBC] getIndexInfo() throws NullPointerException


> I'd have to agree with your bet, thanks a lot
>
> Dave
>
> -----Original Message-----
> From: Cormac Twomey [mailto:cormac@bpallen.com]
> Sent: Monday, February 18, 2002 7:40 PM
> To: pgsql-jdbc@postgresql.org; Dave@micro-automation.net
> Subject: [JDBC] getIndexInfo() throws NullPointerException
>
>
> Calling getIndexInfo against a postgresql-7.1 db with the 7.2 jdbc
> driver (or with 7.3dev built 2002-02-09 ), I get the following
> exception:
>
> Exception in thread "main" java.lang.NullPointerException
>         at org.postgresql.jdbc2.ResultSet.getBytes(Unknown source)
>         at org.postgresql.jdbc2.DatabaseMetaData.getIndexInfo(Unknown
> source)
>         at foo.bar(foo.java:253)
>         at foo.baz(foo.java:167)
>         at foo.main(foo.java:46)
>
> I decided to poke around in the source code and found the following
> piece of questionable-looking code in
> org/postgresql/jdbc2/DatabaseMetaData.jar:
>
> ...
>     if (columnNameRS.next())
>         tuple[8] = columnNameRS.getBytes(1);
>     else
>         tuple[8] = "".getBytes();
>     tuple[8] = columnNameRS.getBytes(1);
> ...
>
> Now, being willing to bet that that last line shouldn't be there, I
> commented it out and tried it again - and bingo! it worked fine.
>
> I see Dave Cramer's uid at the top of DatabaseMetaData.jar, so cc'ing
> him.
>
> Thanks,
> --Cormac Twomey
>
>
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>


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Re: getIndexInfo() throws NullPointerException Patch applied

From
"Dave Cramer"
Date:
Your patch has been applied

DAve

-----Original Message-----
From: pgsql-jdbc-owner@postgresql.org
[mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Cormac Twomey
Sent: Monday, February 18, 2002 8:51 PM
To: Dave@micro-automation.net; pgsql-jdbc@postgresql.org
Subject: Re: [JDBC] getIndexInfo() throws NullPointerException


Ok, I have one further issue, which I'm much less certain of - some of
the indexes that I'm trying to obtain info about are multi-column
indexes, but the resultset for getIndexInfo is only returning the column
name of one of those columns. For the other columns, it's returning an
empty string.

So, for example, given the following index:

create index foo_abc_idx on foo (a, b, c)

calling getIndexInfo on table foo, will return 3 results (as I expected)
but with the following columns:

ORDINAL_POSITION | COLUMN_NAME
------------------------------
1                | c
2                |
3                |

The documentation for this call is sparse enough, so I'm not sure I'm
not doing something wrong.... ideas?

Thanks,
--Cormac

----- Original Message -----
From: "Dave Cramer" <Dave@micro-automation.net>
To: "'Cormac Twomey'" <cormac@bpallen.com>; <pgsql-jdbc@postgresql.org>;
<Dave@micro-automation.net>
Sent: Monday, February 18, 2002 4:54 PM
Subject: Re: [JDBC] getIndexInfo() throws NullPointerException


> I'd have to agree with your bet, thanks a lot
>
> Dave
>
> -----Original Message-----
> From: Cormac Twomey [mailto:cormac@bpallen.com]
> Sent: Monday, February 18, 2002 7:40 PM
> To: pgsql-jdbc@postgresql.org; Dave@micro-automation.net
> Subject: [JDBC] getIndexInfo() throws NullPointerException
>
>
> Calling getIndexInfo against a postgresql-7.1 db with the 7.2 jdbc
> driver (or with 7.3dev built 2002-02-09 ), I get the following
> exception:
>
> Exception in thread "main" java.lang.NullPointerException
>         at org.postgresql.jdbc2.ResultSet.getBytes(Unknown source)
>         at org.postgresql.jdbc2.DatabaseMetaData.getIndexInfo(Unknown
> source)
>         at foo.bar(foo.java:253)
>         at foo.baz(foo.java:167)
>         at foo.main(foo.java:46)
>
> I decided to poke around in the source code and found the following
> piece of questionable-looking code in
> org/postgresql/jdbc2/DatabaseMetaData.jar:
>
> ...
>     if (columnNameRS.next())
>         tuple[8] = columnNameRS.getBytes(1);
>     else
>         tuple[8] = "".getBytes();
>     tuple[8] = columnNameRS.getBytes(1);
> ...
>
> Now, being willing to bet that that last line shouldn't be there, I
> commented it out and tried it again - and bingo! it worked fine.
>
> I see Dave Cramer's uid at the top of DatabaseMetaData.jar, so cc'ing
> him.
>
> Thanks,
> --Cormac Twomey
>
>
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>


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