Re: examples of SQL Arrays and jdbc?

Yes, in general any postgres data type can be set/get using
setString/getString

This may change in the future, it is really an artifact of the wire
protocol

Be warned!

Dave
On Thu, 2003-02-06 at 19:11, Eric B.Ridge wrote:
> On Thursday, February 6, 2003, at 06:18  PM, Richard Welty wrote:
>
> > first, apologies for that blank message i just accidentally sent to the
> > list.
> >
> > i'm looking for some decent examples of using the SQL array type with
> > JDBC.
> > i have a number of arrays of 12 integers which need to come in and
> > out. my
> > reference right now is the Sun _JDBC API Tutorial and Reference_, and
> > it's
> > leaving me thinking that the Array/JDBC API is incredibly badly thought
>
> I couldn't agree more.  JDBC Array support sucks.
>
> > out, e.g. i can extract an int [] easily but i have to convert it to an
> > Integer [] in order to write it back out. it can't really be this bad,
> > can
> > it?
>
> Postgres is cool in that you can do a stmt.setString(...) (if using
> prepared statements) for any datatype, including arrays.
>
> Postgres' string form of an array is (in its simplest form):
>     {1, 2, 3, N}
>         or
>     {"a", "b", "c", "N"}
>
> So you can convert your int[] into a String in the above form and just
> do:
>     stmt.setString(3, Helper.arrayToPostgresString(myIntArray));
>
> And if you're creating INSERT/UPDATE statements yourself:
>
> create table foo (bar int[]);
> insert into foo (bar) values ('{"1","2","3"}');
>
> I got fancy and stole Postgres' java.sql.Array implementation and added
> a little factory method to it, so I can do things like this:
>     java.sql.Array array = MyPostgresArray.create(new int[] { 1, 2, 3 });
>     stmt.setArray(3, array);
>             or
>     java.sql.Array array = MyPostgresArray.create(new int[] { 1, 2, 3 });
>     String sql = "insert into foo (bar) values (" + array.toString() + ")";
>
> I know this class works great w/ Postgres 7.2.x.  I haven't tested it
> with 7.3.  It's attached in case you find it useful.  Note that this
> class doesn't support multidimensional arrays.
>
> eric
>
>
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--
Dave Cramer <Dave@micro-automation.net>