Strategy 1: One table per subclass (Persons).
策略1：每个子类一个表(Persons)。
The pros are similar to the above "Table per Subclass" strategy.
优点和上面的“每个子类一张表”策略相似。
For our first strategy (one table per subclass), Hibernate will read multiple tables each time an object is instantiated and populated.
对于第一个策略(每个子类一个表)，Hibernate每次初始化和填充对象时，会读取多个表。
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