Tools and Libraries of AWS DynamoDB - DynamoDB Applied Design Patterns - page 72

ArrayList<AttributeDefinition> attributeDefinitions =
newArrayList<AttributeDefinition>();
attributeDefinitions.add(new AttributeDefinition()
.withAttributeName("BookTitle")
.withAttributeType("S"));
attributeDefinitions.add(new AttributeDefinition()
.withAttributeName("Author")
.withAttributeType("S"));
attributeDefinitions.add(new AttributeDefinition()
.withAttributeName("PubDate")
.withAttributeType("S"));
attributeDefinitions.add(new AttributeDefinition()
.withAttributeName("Publisher")
.withAttributeType("S"));
attributeDefinitions.add(new AttributeDefinition()
.withAttributeName("Edition")
.withAttributeType("N"));
return attributeDefinitions;
}
The next method will return ArrayList of the KeySchemaElement type. To this
ArrayList , we are adding two KeySchemaElement . The first element is to set the
BookTitle attribute as the hash key type and the second element is to set the Author
attribute as the range key type. Finally we return this ArrayList as shown in the fol-
lowing code:
private static ArrayList<KeySchemaElement>
getTableKeySchema() {
ArrayList<KeySchemaElement> ks =
newArrayList<KeySchemaElement>();
ks.add(new KeySchemaElement()
.withAttributeName("BookTitle")
.withKeyType(KeyType.HASH));
ks.add(new KeySchemaElement()
.withAttributeName("Author")
.withKeyType(KeyType.RANGE));
return ks;
}