Long nextid = null; try {
List list = jdbcTempSource.getJdbcTemp().queryMultiObject(queryParams, sql);
Iterator iter = list.iterator();
if (iter.hasNext()) {
Map map = (Map) iter.next();
nextid = (Long)map.get("id");
}
if (nextid == null) {
throw new SQLException("Error: A null sequence was returned from the database (could not get next " + idType + " sequence).");
}
nextid = new Long(nextid.longValue() + 1);//
String updatesql = "update jiveID set id = ? where idType = ?";
queryParams.clear();
queryParams.add(nextid);
queryParams.add(new Integer(idType));
jdbcTempSource.getJdbcTemp().operate(queryParams, updatesql);
nextid = new Long(nextid.longValue() + 1);//
String updatesql = "update jiveID set id = ? where idType = ?";
假如有多人同时取nextid,是否可能取回相同的值。
是否应该加上同步?
另外我想问一问,jdon有没有提供“事务”处理。[我在代码中没找到]
如果要使用jta [jotm] ,那么jta放在哪一层比较好。[放在action中可以吗]
谢谢!