conn2.setAutoCommit(false);
st1 = conn1.createStatement();
st2 = conn2.createStatement();
sql = "INSERT INTO " + this.tableName + " VALUES ('first', 1)";
pool.update(sql);
sql = "UPDATE " + this.tableName + " SET age=2 WHERE name='first'";
st1.executeUpdate(sql);
sql = "UPDATE " + this.tableName + " SET age=3 WHERE name='first'";
st2.executeUpdate(sql);
sql = "UPDATE " + this.tableName + " SET age=4 WHERE name='first'";