设计中采用行扫描法识别键的闭合，并且在按键的选用和信号的传输上都有其独特之处。
The design identify shutting of key using row scanning. It is peculiar in a-side of keys selection and signal transmission.
如果您在设计阶段就已知道主索引键资讯，建议您明确地指定主索引键资料行，以达到最佳效能。
If you know the primary key information at design time, we recommend that you explicitly specify the primary key column or columns in order to achieve optimal performance.
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