Sometimes you may want to change this order or perhaps only specify values for columns that have NOT NULL constraints.

有时候您希望更改这种顺序或可能希望只为具有NOT NULL约束的列指定值。

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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.

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。

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Constraints Supports, primary, foreign, unique, not null constraint.

约束 支持主键、外键、惟一和非空约束。

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