JDBC connection.setAutoCommit(false) commits after each update????

Question

The problem is on AUTO COMMIT of JDBC connection.
What I did was:
conn.setAutoCommit(false);
conn.executeUpdate( mySQLStatement );
conn.rollback();
The expected result to the database table
should be: NOTHING UPDATED.
But what actually happened was: the updates
went into the database.
So the setAutoCommit(false) didn't work
as expected.
BTW, I am using Oracle 8.1.7 and the Oracle
thin JDBC driver.
Any help or hint will be appreciated.
Thanks.
Chenglin

Answer 1

Chenglin,
I ran the below java class on our SUN [sparc] Solaris 7 computer with J2SE 1.4.2_02, Oracle 8i (8.1.7.4) database and the "classes12.zip" file that comes with the database distribution. I checked the column value -- using SQL*Plus -- before and after running the java class, and the value was the same.
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class JdbcTes2 {
  public static void main(String[] args) {
    final String SQL = "update "              +
                          "TABLE "            +
                       "set "                 +
                          "COLUMN = 'Value' " +
                       "where "               +
                          "PRIMARY_KEY = 'key'";
    Connection dbConn = null;
    Statement stmt = null;
    String line = null;
    String url = "???";
    try {
      Class.forName("oracle.jdbc.driver.OracleDriver");
      dbConn = DriverManager.getConnection(url);
      dbConn.setAutoCommit(false);
      stmt = dbConn.createStatement();
      stmt.executeUpdate(SQL);
      dbConn.rollback();
    catch (Exception x) {
      System.err.println("Exception caught: " + x);
      x.printStackTrace();
    finally {
      if (stmt != null) {
        try {
          stmt.close();
        catch (Exception x) {
          System.err.println("Failed to close statement.");
          x.printStackTrace();
      if (dbConn != null) {
        try {
          dbConn.close();
        catch (Exception x) {
          System.err.println("Failed to close DB connection.");
          x.printStackTrace();
}Good Luck,
Avi.