问题描述
我正在查看一个客户端应用程序，该应用程序检索几列，包括ROWID和以后使用ROWID标识需要更新的行:
I'm looking at a client application which retrieves several columns including ROWID, and later uses ROWID to identify rows it needs to update:
update some_table t set col1=value1
where t.rowid = :selected_rowid
这样做安全吗?在修改表时，行的ROWID可以更改吗?
Is it safe to do so? As the table is being modified, can ROWID of a row change?
推荐答案
从Oracle 8开始，ROWID的格式和大小从8字节更改为10个字节.请注意，ROWID的格式将在您重新组织或导出/导入表.如果是分区表，则在UPDATE期间如果行从一个分区迁移到另一个分区，它也会更改."
"From Oracle 8 the ROWID format and size changed from 8 to 10 bytes. Note that ROWID's will change when you reorganize or export/import a table. In case of a partitioned table, it also changes if the row migrates from a partition to another one during an UPDATE."
http://www.orafaq.com/wiki/ROWID
我会拒绝.如果例如应用程序临时存储ROWID(例如，生成一个可选择项的列表，每个项用ROWID标识，但是该列表将定期重新生成而不存储)，则这可能是安全的.但是，如果以任何持久方式使用ROWID，那都是不安全的.
I'd say no. This could be safe if for instance the application stores ROWID temporarily(say generating a list of select-able items, each identified with ROWID, but the list is routinely regenerated and not stored). But if ROWID is used in any persistent way it's not safe.
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