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UniqueConstraint

UniqueConstraint

所谓唯一性约束(uniqueconstraint)不过是数据表内替代键的另一个名称而已。替代键(alternatekey)可以是数据表内不作为主键 …

...oreignkeyconstraint)3.2.3唯一约束(uniqueconstraint)3.2.4检查约束(checkconstraint)3.2.5默认值约束(defsuhconstraint)3.2.6...

...tatable的约束都有些什么呢?有两个,一个叫做唯一键(UniqueConstraint),一个叫做外键(ForeignKeyConstraint).唯一键就是说, …

The following example adds a UniqueConstraint to a DataSet and sets the EnforceConstraints property to true .

The following example creates a UniqueConstraint for two columns of a DataTable.

You can also enforce data integrity in the DataSet by using the UniqueConstraint and ForeignKeyConstraint objects .

There are two kinds of constraints in ADO. NET: the ForeignKeyConstraint and the UniqueConstraint.

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