The normal behaviour of a database access is to get a read lock on the queried data, which gets transformed into an update lock if data is updated.
数据库访问通常会对被查询的数据进行读锁定，在数据更新后会变成更新锁定。
When a read lock exists, many read operations may use this lock.
当存在一个读锁时，很多读操作均可使用这个锁。
When a read lock exists, many read operations may use this lock.
当存在一个读锁时，很多读操作均可使用这个锁。
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