/*
* Copyright 2014-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.codesamples.document;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient;
import com.amazonaws.services.dynamodbv2.document.DeleteItemOutcome;
import com.amazonaws.services.dynamodbv2.document.DynamoDB;
import com.amazonaws.services.dynamodbv2.document.Item;
import com.amazonaws.services.dynamodbv2.document.Table;
import com.amazonaws.services.dynamodbv2.document.UpdateItemOutcome;
import com.amazonaws.services.dynamodbv2.document.spec.DeleteItemSpec;
import com.amazonaws.services.dynamodbv2.document.spec.UpdateItemSpec;
import com.amazonaws.services.dynamodbv2.document.utils.NameMap;
import com.amazonaws.services.dynamodbv2.document.utils.ValueMap;
import com.amazonaws.services.dynamodbv2.model.ReturnValue;
public class DocumentAPIItemCRUDExample {
static DynamoDB dynamoDB = new DynamoDB(new AmazonDynamoDBClient(
new ProfileCredentialsProvider()));
static String tableName = "ProductCatalog";
public static void main(String[] args) throws IOException {
createItems();
retrieveItem();
// Perform various updates.
updateMultipleAttributes();
updateAddNewAttribute();
updateExistingAttributeConditionally();
// Delete the item.
deleteItem();
}
private static void createItems() {
Table table = dynamoDB.getTable(tableName);
try {
Item item = new Item()
.withPrimaryKey("Id", 120)
.withString("Title", "Book 120 Title")
.withString("ISBN", "120-1111111111")
.withStringSet( "Authors",
new HashSet<String>(Arrays.asList("Author12", "Author22")))
.withNumber("Price", 20)
.withString("Dimensions", "8.5x11.0x.75")
.withNumber("PageCount", 500)
.withBoolean("InPublication", false)
.withString("ProductCategory", "Book");
table.putItem(item);
item = new Item()
.withPrimaryKey("Id", 121)
.withString("Title", "Book 121 Title")
.withString("ISBN", "121-1111111111")
.withStringSet( "Authors",
new HashSet<String>(Arrays.asList("Author21", "Author 22")))
.withNumber("Price", 20)
.withString("Dimensions", "8.5x11.0x.75")
.withNumber("PageCount", 500)
.withBoolean("InPublication", true)
.withString("ProductCategory", "Book");
table.putItem(item);
} catch (Exception e) {
System.err.println("Create items failed.");
System.err.println(e.getMessage());
}
}
private static void retrieveItem() {
Table table = dynamoDB.getTable(tableName);
try {
Item item = table.getItem("Id", 120, "Id, ISBN, Title, Authors", null);
System.out.println("Printing item after retrieving it....");
System.out.println(item.toJSONPretty());
} catch (Exception e) {
System.err.println("GetItem failed.");
System.err.println(e.getMessage());
}
}
private static void updateAddNewAttribute() {
Table table = dynamoDB.getTable(tableName);
try {
Map<String, String> expressionAttributeNames = new HashMap<String, String>();
expressionAttributeNames.put("#na", "NewAttribute");
UpdateItemSpec updateItemSpec = new UpdateItemSpec()
.withPrimaryKey("Id", 121)
.withUpdateExpression("set #na = :val1")
.withNameMap(new NameMap()
.with("#na", "NewAttribute"))
.withValueMap(new ValueMap()
.withString(":val1", "Some value"))
.withReturnValues(ReturnValue.ALL_NEW);
UpdateItemOutcome outcome = table.updateItem(updateItemSpec);
// Check the response.
System.out.println("Printing item after adding new attribute...");
System.out.println(outcome.getItem().toJSONPretty());
} catch (Exception e) {
System.err.println("Failed to add new attribute in " + tableName);
System.err.println(e.getMessage());
}
}
private static void updateMultipleAttributes() {
Table table = dynamoDB.getTable(tableName);
try {
UpdateItemSpec updateItemSpec = new UpdateItemSpec()
.withPrimaryKey("Id", 120)
.withUpdateExpression("add #a :val1 set #na=:val2")
.withNameMap(new NameMap()
.with("#a", "Authors")
.with("#na", "NewAttribute"))
.withValueMap(new ValueMap()
.withStringSet(":val1", "Author YY", "Author ZZ")
.withString(":val2", "someValue"))
.withReturnValues(ReturnValue.ALL_NEW);
UpdateItemOutcome outcome = table.updateItem(updateItemSpec);
// Check the response.
System.out
.println("Printing item after multiple attribute update...");
System.out.println(outcome.getItem().toJSONPretty());
} catch (Exception e) {
System.err.println("Failed to update multiple attributes in "
+ tableName);
System.err.println(e.getMessage());
}
}
private static void updateExistingAttributeConditionally() {
Table table = dynamoDB.getTable(tableName);
try {
// Specify the desired price (25.00) and also the condition (price =
// 20.00)
UpdateItemSpec updateItemSpec = new UpdateItemSpec()
.withPrimaryKey("Id", 120)
.withReturnValues(ReturnValue.ALL_NEW)
.withUpdateExpression("set #p = :val1")
.withConditionExpression("#p = :val2")
.withNameMap(new NameMap()
.with("#p", "Price"))
.withValueMap(new ValueMap()
.withNumber(":val1", 25)
.withNumber(":val2", 20));
UpdateItemOutcome outcome = table.updateItem(updateItemSpec);
// Check the response.
System.out
.println("Printing item after conditional update to new attribute...");
System.out.println(outcome.getItem().toJSONPretty());
} catch (Exception e) {
System.err.println("Error updating item in " + tableName);
System.err.println(e.getMessage());
}
}
private static void deleteItem() {
Table table = dynamoDB.getTable(tableName);
try {
DeleteItemSpec deleteItemSpec = new DeleteItemSpec()
.withPrimaryKey("Id", 120)
.withConditionExpression("#ip = :val")
.withNameMap(new NameMap()
.with("#ip", "InPublication"))
.withValueMap(new ValueMap()
.withBoolean(":val", false))
.withReturnValues(ReturnValue.ALL_OLD);
DeleteItemOutcome outcome = table.deleteItem(deleteItemSpec);
// Check the response.
System.out.println("Printing item that was deleted...");
System.out.println(outcome.getItem().toJSONPretty());
} catch (Exception e) {
System.err.println("Error deleting item in " + tableName);
System.err.println(e.getMessage());
}
}
}
