Database Reference
In-Depth Information
The mandatory attributes, name and type, will be already populated and we cannot change
them. But we can add the attribute values (which must be unique).
In addition to that, we can simple click on empty textboxes (under hash and range key at-
tribute name) to add item-specific attribute name, type, and value.
Here the first four attributes are of the type
String
, so we can enter the corresponding
values in the attribute value field.
While entering multivalued data for a
Set
data type (
StringSet
for the
Language
field), specify multiple strings or numbers by clicking on the plus sign to the right of the
value textbox. Once all the attributes are entered, click on the
Put Item
button, which will
put this item into the
Tbl_Book
table.
To view the inserted item, click on the
Browse Items
tab, select the
Scan
radio button,
and click on the
Go
button. Now we will be able to see the table content as shown in the
following screenshot:
The
String
attribute values are enclosed in double quotes, and the
Set
attribute values
are enclosed by set brackets. The number attribute values won't be enclosed by any char-
acter.
There are a few rules while using the
Set
data type. These rules are as follows:
•
Set
must have a nonzero number of elements (that is, empty sets are not permit-
ted)
•
Set
must not have duplicate values (that is, the
Language
set will not take
English
,
English
)