源代码说明： 标准TTable对象用于持续增加区域
piSysData descends from a standard TTable and is used when you have a field that you want to continually increment. Many developers like to steer away from using autoincrementing fields, so this component was developed to offer the same functionality. The most useful use for this component is in conjunction with a systems table that holds IDs about all the tables used

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