An unrepeatable read, phantom read, and reads of uncommitted data can occur.
会发生不可重读、幻像读和读未提交数据。
An attempt to read from or write to uncommitted memory causes an access violation.
任何试图对未提交的内存进行读写的操作都会导致访问异常。
Read committed, Read uncommitted, Repeatable Read, Serializable.
提交读，未提交读，可重复读，可串行读。
Read committed, Read uncommitted, Repeatable Read, Serializable.
提交读，未提交读，可重复读，可串行读。
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