We can get a column? S value either by specifying the column index as an integer or the column name as a String object. I show both approaches in the code.

通过指定整数类型的列索引，或String对象类型的列名，就可以获得一个列的值。

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A field such as ContactDatabase.N can be an aggregate composed of up to five parts, as follows, where the integer represents the index of the respective component part.

如ContactDatabase . n之类的字段可以是最多由5个部分组成的聚合，如下所示，其中整数表示各个组件部分的索引。

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Any integer expression can be used as an index.

任意的一个整型表达式，都可以用来作为索引编号。

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