Re: strange commit behavior - Mailing list pgsql-general

Hi Thomas,

I wrote the following test case that seems to work fine.

Any suggestion ?

Thanks a lot

Flavio


import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.Savepoint;

public class TestCommitPostgres {

    public TestCommitPostgres() {
        java.io.BufferedReader br = null;
        Connection con = null;
        try {
            Class.forName("org.postgresql.Driver").newInstance();
            con =
java.sql.DriverManager.getConnection("jdbc:postgresql://localhost:5432/postg
res", "user", "pass");
            PreparedStatement ps = con.prepareStatement("insert into
public.test1 values(?,?,?,?)");

            java.io.FileReader fr = new
java.io.FileReader("test2_postgres.txt");
            br = new java.io.BufferedReader(fr);
            con.setAutoCommit(false);


            while (true) {
                String s = br.readLine();
                if (s == null) {
                    break;
                }
                String[] sch = s.split("::");
                if (sch.length != 4) {
                    continue;
                }
                Savepoint sp = con.setSavepoint();
                try {
                    ps.setString(1, sch[0]);
                    ps.setString(2, sch[1]);
                    ps.setDouble(3, new Double(sch[2]).doubleValue());
                    ps.setInt(4, new Integer(sch[3]).intValue());
                    ps.executeUpdate();
                    con.releaseSavepoint(sp);
                } catch (Throwable t) {
                    con.rollback(sp);
                }
            }

        } catch (Throwable t) {
            System.out.println("errore - " + t);
        }
        try {
            if (con != null) {
                con.commit();
                con.setAutoCommit(true);
                con.close();
            }
            if (br != null) {
                br.close();
            }
        } catch (Throwable t) {
        }
    }

    public static void main(String[] args) {
        new TestCommitPostgres();
        System.exit(0);
    }
}
-------------------------------------------- test1 table
CREATE TABLE test1
(
  testfield1 varchar(40),
  testfield2 varchar(40),
  testfield3 numeric(30,10),
  chiave numeric(7) NOT NULL,
  CONSTRAINT test1_pkey PRIMARY KEY (chiave)
)
WITHOUT OIDS;
ALTER TABLE test1 OWNER TO postgres;
-------------------------------------------- test2_postgres.txt
aa::bb::1::71::
aa1::bb1::11::70::
aa2::bb2::12::75::
aa3::bb2::13::77::
aa2::bb2::12::75::
aa2::bb2::12::78::
aa2::bb2::12::71::

Flavio Palumbo, 18.11.2008 10:01:
> I tested this tool under MySql and Oracle and everything went as expected.
>
> Unfortunately postgres seems to work in a different way, cause if there is
> just one error while the transaction is active I'm not able to commit the
> well formed data in the db, no matter if the good records were inserted
> sooner or later the error.
>
> Does this behavior appears right for postgres ?

Yes this is the way Postgres works (been there as well)

> There is any way or workaround to achieve my goal ?

You need to wrap each UPDATE/INSERT statement with a Savepoint

Savepoint sp = connection.setSavepoint()
try
{
  // do your insert/update/delete here
  connection.release(sp);
}
catch (SQLException sql)
{
  connection.rollback(sp);
}

Thomas


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