Service.pid (Constants.SERVICE_PID) - a string, or array of strings, representing the service's persistent identifier.
pid (Constants . SERVICE_PID)-字符串，代表服务的pid (persistent identifier)。
A deputy object has its own persistent identifier, and may have additional attributes and methods that are not derived from its source objects.
一个代理对象享有其自己的标识符，而且除了继承源对象的属性和方法外，还能拥有独自的属性和方法。
Set if the column contains a persistent row identifier that cannot be written to, and has no meaningful value except to identify the row.
如果列包含无法向其写入的持久性行标识符，并且除了标识行外没有其他有意义的值，则应设置该值。
Set if the column contains a persistent row identifier that cannot be written to, and has no meaningful value except to identity the row.
如果列包含无法写入的不变的行标识符，并且除了标识行外没有其他有意义的值，则设置该值。
Set if the column contains a persistent row identifier that cannot be written to, and has no meaningful value except to identity the row.
如果列包含无法写入的不变的行标识符，并且除了标识行外没有其他有意义的值，则设置该值。
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