/*
* Copyright 2014-2014 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.services.dynamodbv2.document.quickstart;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import com.amazonaws.services.dynamodbv2.document.GetItemOutcome;
import com.amazonaws.services.dynamodbv2.document.Item;
import com.amazonaws.services.dynamodbv2.document.Table;
import com.amazonaws.services.dynamodbv2.document.spec.GetItemSpec;
import com.amazonaws.services.dynamodbv2.document.utils.AbstractQuickStart;
import com.amazonaws.services.dynamodbv2.document.utils.NameMap;
/**
* Sample code to get item outcome from DynamoDB table.
*/
public class C_GetItemOutComeTest extends AbstractQuickStart {
@Before
public void before() {
new B_PutItemTest().howToPutItems();
}
@Test
public void howToGetItemOutcomes() {
Table table = dynamo.getTable(TABLE_NAME);
for (int i=1; i <= 10; i++) {
GetItemOutcome outcome = table.getItemOutcome(
HASH_KEY_NAME, "foo", RANGE_KEY_NAME, i);
Item item = outcome.getItem();
System.out.println("========== item " + i + " ==========");
System.out.println(item);
byte[] binary = item.getBinary("binary");
System.out.println("binary: " + Arrays.toString(binary));
Set<byte[]> binarySet = item.getBinarySet("binarySet");
for (byte[] ba: binarySet) {
System.out.println("binary set element: " + Arrays.toString(ba));
}
boolean bTrue = item.getBoolean("booleanTrue");
System.out.println("booleanTrue: " + bTrue);
int intval = item.getInt("intAttr");
System.out.println("intAttr: " + intval);
List<Object> listval = item.getList("listAtr");
System.out.println("listAtr: " + listval);
Map<String,Object> mapval = item.getMap("mapAttr");
System.out.println("mapAttr: " + mapval);
Object nullval = item.get("nullAttr");
System.out.println("nullAttr: " + nullval);
BigDecimal numval = item.getNumber("numberAttr");
System.out.println("numberAttr: " + numval);
String strval = item.getString("stringAttr");
System.out.println("stringAttr: " + strval);
Set<String> strset = item.getStringSet("stringSetAttr");
System.out.println("stringSetAttr: " + strset);
// "Outcome" allows access to the low level result
System.out.println("low level result: " + outcome.getGetItemResult());
}
}
@Test
public void howToUseProjectionExpression() {
Table table = dynamo.getTable(TABLE_NAME);
for (int i=1; i <= 10; i++) {
GetItemOutcome outcome = table.getItemOutcome(
HASH_KEY_NAME, "foo", RANGE_KEY_NAME, i,
// Here is the projection expression to select 3 attributes
// to be returned.
// This expression requires attribute name substitution for
// "binary" which is a reserved word in DynamoDB
"#binary, intAttr, stringAttr",
new NameMap().with("#binary", "binary"));
Item item = outcome.getItem();
System.out.println("========== item " + i + " ==========");
System.out.println(item);
byte[] binary = item.getBinary("binary");
System.out.println("binary: " + Arrays.toString(binary));
int intval = item.getInt("intAttr");
System.out.println("intAttr: " + intval);
Set<String> strset = item.getStringSet("stringSetAttr");
System.out.println("stringSetAttr: " + strset);
// "Outcome" allows access to the low level result
System.out.println("low level result: " + outcome.getGetItemResult());
}
}
@Test
public void howToUseGetItemSpec() {
Table table = dynamo.getTable(TABLE_NAME);
for (int i=1; i <= 10; i++) {
GetItemOutcome outcome = table.getItemOutcome(new GetItemSpec()
.withPrimaryKey(HASH_KEY_NAME, "foo", RANGE_KEY_NAME, i)
.withProjectionExpression("#binary, intAttr, stringAttr")
.withNameMap(new NameMap().with("#binary", "binary")));
Item item = outcome.getItem();
System.out.println("========== item " + i + " ==========");
System.out.println(item);
byte[] binary = item.getBinary("binary");
System.out.println("binary: " + Arrays.toString(binary));
int intval = item.getInt("intAttr");
System.out.println("intAttr: " + intval);
Set<String> strset = item.getStringSet("stringSetAttr");
System.out.println("stringSetAttr: " + strset);
// "Outcome" allows access to the low level result
System.out.println("low level result: " + outcome.getGetItemResult());
}
}
@Test
public void getNonExistentItem() {
Table table = dynamo.getTable(TABLE_NAME);
GetItemOutcome outcome = table.getItemOutcome(
HASH_KEY_NAME, "bar", RANGE_KEY_NAME, 99);
Item item = outcome.getItem();
Assert.assertNull(item);
// "Outcome" allows access to the low level result
System.out.println("low level result: " + outcome.getGetItemResult());
}
}