这种校验会通过拒绝空值，强迫加上非空[not NULL]字段的约束，但是也只有在这种情况下，你的数据库会拒绝空值。

This new validation will enforce NOT null column constraints by rejecting null values, but only in situations where your database would reject a null value.

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最后，如果没有外部输入信号，系统的行为完全由自己的初始条件确定，该系统就称为齐次或非强迫系统。

Finally, if there are no external inputs and the system behavior is determined entirely by its initial conditions, the system is said to be homogeneous or unforced.

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本文就一类强迫非简谐振子出现随机行为问题作一些讨论并给出数值计算的结果。

In this paper, some discussions and calculations about stochastic behaviour of a kind of forced anharmonic oscillator will be given.

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