For rowset cursors, the JDBC 1 positioned update syntax needs be aware of the rowset.
对于行集游标，JDBC 1定位更新语法必须知道行集的存在。
Using the new support for SQL, positioned update is faster than searched update or delete.
使用新的SQL支持，定位的更新比搜索的更新或删除更快。
Thus, to perform positioned update or delete operations, you need to disable the AUTOCOMMIT mode.
因而，要执行定点的更新或删除操作，您必须禁用autocommit模式。
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