在 Eclipse Java EE IDE 中,我尝试以编程方式创建 DynamoDB 表。我有下面的方法,该方法是从其他几个来源借来的。在 Table table = DYNAMODB.createTable(request)
处,Eclipse 给出异常:类型不匹配:无法从 CreateTableResult 转换为 Table。
public static final String S3_BUCKET_CHANNELS = "channels";
public static final String S3_BUCKET_EPISODES = "episodes";
public static final String SQS_QUEUE_NAME = "queue";
public static final String DYNAMODB_TABLE_CHANNELS = "channels";
public static final String DYNAMODB_TABLE_EPISODES = "episodes";
public static final String MACRO_PATH = "macros/";
public static final String FINISHED_PATH = "final/";
public static final AWSCredentialsProvider CREDENTIALS_PROVIDER =
new ClasspathPropertiesFileCredentialsProvider();
public static final Region REGION = Region.getRegion(Regions.US_WEST_2);
public static final AmazonS3Client S3 = new AmazonS3Client(CREDENTIALS_PROVIDER);
public static final AmazonSQSClient SQS = new AmazonSQSClient(CREDENTIALS_PROVIDER);
public static final AmazonDynamoDBClient DYNAMODB = new AmazonDynamoDBClient(CREDENTIALS_PROVIDER);
public static final DynamoDBMapper DYNAMODB_MAPPER = new DynamoDBMapper(DYNAMODB, CREDENTIALS_PROVIDER);
static {
DYNAMODB.setRegion(REGION);
SQS.setRegion(REGION);
}
public static void createChannelsTable() throws Exception {
List<AttributeDefinition> attributeDefinitions = new ArrayList<AttributeDefinition>(1);
attributeDefinitions.add(new AttributeDefinition().withAttributeName("url").withAttributeType(ScalarAttributeType.S));
attributeDefinitions.add(new AttributeDefinition().withAttributeName("title").withAttributeType(ScalarAttributeType.S));
List<KeySchemaElement> keyDefinitions = new ArrayList<KeySchemaElement>(2);
keyDefinitions.add(new KeySchemaElement().withAttributeName("url").withKeyType(KeyType.HASH));
ProvisionedThroughput provisionedThroughput = new ProvisionedThroughput(50l, 50l);
GlobalSecondaryIndex globalSecondaryIndex =
new GlobalSecondaryIndex().withIndexName("channelIndex")
.withProjection(new Projection().withProjectionType(ProjectionType.ALL))
.withKeySchema(
new KeySchemaElement("title", KeyType.HASH),
new KeySchemaElement("url", KeyType.RANGE)
)
.withProvisionedThroughput(provisionedThroughput);
CreateTableRequest request =
new CreateTableRequest().withTableName(DYNAMODB_TABLE_CHANNELS)
.withKeySchema(keyDefinitions)
.withAttributeDefinitions(attributeDefinitions)
.withProvisionedThroughput(provisionedThroughput)
.withGlobalSecondaryIndexes(globalSecondaryIndex);
try {
Table table = DYNAMODB.createTable(request);
table.waitForActive();
} catch (Exception e) {
System.err.println("Unable to create table: ");
System.err.println(e.getMessage());
}
}
转换表格不起作用,奇怪的是,当我将其导入 Eclipse Neon 时没有出现错误。我正在使用 aws-java-sdk-dynamodb-1.10.42.jar 中的 com.amazonaws.services.dynamodbv2.document.Table
。
最佳答案
您正在 DYNAMODB
上调用 createTable
,在您的情况下,它是 AmazonDynamoDBClient
的实例。
相反,您需要在 com.amazonaws.services.dynamodbv2.document.DynamoDB
的实例上调用 createTable
。更具体地说,像这样更改您的代码:
public static final AmazonDynamoDBClient DYNAMODB_CLIENT = new AmazonDynamoDBClient(CREDENTIALS_PROVIDER);
public static final DynamoDB DYNAMODB = new DynamoDB(DYNAMODB_CLIENT);
...
Table table = DYNAMODB.createTable(request);
table.waitForActive();
查看完整示例 here .
关于java - DynamoDB 类型不匹配 : cannot convert from CreateTableResult to Table,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40385842/