oracle简单学习总结（六）――数据库事务(二)
ate user set money=money-10 where id=3";
st.executeUpdate(sql);
sql = "select money from user where id=2";
rs = st.executeQuery(sql);
float money = 0.0f;
if (rs.next()) {
money = rs.getFloat("money");
}
if (money > 300)
throw new RuntimeException("已经超过最大值！");
sql = "update user set money=money+10 where id=2";
st.executeUpdate(sql);
conn.commit();
} catch (RuntimeException e) {
if (conn != null && sp != null) {
conn.rollback(sp);//回滚到那个事务点上去
conn.commit(); www.2cto.com
}
throw e;
} catch (SQLException e) {
if (conn != null)
conn.rollback();
throw e;
} finally {
JdbcUtils.free(rs, st, conn);
}
}
}