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2 Ensure that the data type for the property allows the constraint you want.
For example, Boolean properties can have not-null constraints only.
3 Do one of the following:
■ To specify a range for the property, set Constraint Type to Range and
specify the range values.
In the Constraint Type field, click the down-arrow and click Range.
Enter a minimum and maximum value for the range and, for each
one, specify whether the range is inclusive or exclusive of that value.
For example, if the range is 1-10, specify whether 1 and 10 are included
or not.
■ To specify a list of possible values, set Constraint Type to List and
specify the list values.
In the Constraint Type field, click the down-arrow and click List. Click
Value List and click
. Type the list, pressing Enter after each item.
If the data type for this property is String , specify the maximum
length of the string before entering values in the list.
If the data type for this property is Decimal , define the precision and
scale before entering values in the list. If you enter values in the list
that exceed the precision or scale, those values are rounded.
If the data type for this property is DateTime, the list editor displays
a calendar from which you can select specific dates. Once you choose
the first date, the list creates a new entry and you can choose the next
date.
When you click OK, AutoCAD Map 3D checks the values in the list.
If the values are not valid, for example, if they do not match the data
type or they exceed the length of the string definition, you will see
an error message.
■ To ensure that the property is not allowed to have an empty value,
set Nullable to False.
In the Nullable field, click the down-arrow and click True or False. If
you set Nullable to False, you can enter a Default Value to ensure that
new features have an entry for this property.
4 To specify a “uniqueness” constraint, select the appropriate feature class
in the tree on the left.
You can specify a single-property uniqueness constraint or a
composite-property uniqueness constraint. A single-property uniqueness
constraint ensures that the value for that property is unique within the
feature class. A composite-property uniqueness constraint (sometimes
602 | Chapter 4 Managing Data