本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。
# 將資源型政策連接至現有 DynamoDB 資料表
您可以使用 DynamoDB 主控台、[PutResourcePolicy](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_PutResourcePolicy.html) API、 AWS CLI、 AWS SDK 或 [CloudFormation 範本](rbac-create-table.md#rbac-create-table-cfn)，將資源型政策連接至現有資料表或修改現有政策。
## AWS CLI 連接新政策的範例
下列 IAM 政策範例使用 `put-resource-policy` AWS CLI 命令，將資源型政策連接至現有資料表。此範例允許使用者 {{John}} 對名為 {{MusicCollection}} 的現有資料表執行 [GetItem](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html)、[PutItem](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_PutItem.html)、[UpdateItem](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateItem.html) 與 [UpdateTable](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateTable.html) API 動作。
請以資源特定資訊取代{{斜體}}文字。
```
aws dynamodb put-resource-policy \
--resource-arn arn:aws:dynamodb:us-west-2:{{123456789012}}:table/{{MusicCollection}} \
--policy \
"{
\"Version\": \"2012-10-17\",
\"Statement\": [
{
\"Effect\": \"Allow\",
\"Principal\": {
\"AWS\": \"arn:aws:iam::{{111122223333}}:user/{{John}}\"
},
\"Action\": [
\"dynamodb:GetItem\",
\"dynamodb:PutItem\",
\"dynamodb:UpdateItem\",
\"dynamodb:UpdateTable\"
],
\"Resource\": \"arn:aws:dynamodb:us-west-2:{{123456789012}}:table/{{MusicCollection}}\"
}
]
}"
```
## AWS CLI 以條件式更新現有政策的範例
若要有條件地更新資料表現有的資源型政策，您可以使用選用的 `expected-revision-id` 參數。下列範例僅當政策存在於 DynamoDB 且其目前修訂版 ID 符合提供的 `expected-revision-id` 參數時，才會更新政策。
```
aws dynamodb put-resource-policy \
--resource-arn arn:aws:dynamodb:us-west-2:123456789012:table/{{MusicCollection}} \
--expected-revision-id 1709841168699 \
--policy \
"{
\"Version\": \"2012-10-17\",
\"Statement\": [
{
\"Effect\": \"Allow\",
\"Principal\": {
\"AWS\": \"arn:aws:iam::111122223333:user/{{John}}\"
},
\"Action\": [
\"dynamodb:GetItem\",
\"dynamodb:UpdateItem\",
\"dynamodb:UpdateTable\"
],
\"Resource\": \"arn:aws:dynamodb:us-west-2:123456789012:table/{{MusicCollection}}\"
}
]
}"
```
## AWS 管理主控台
1. 登入 AWS 管理主控台 ，並在 https：//[https://console.aws.amazon.com/dynamodb/](https://console.aws.amazon.com/dynamodb/) 開啟 DynamoDB 主控台。
1. 在儀表板中選取現有資料表。
1. 前往**權限**分頁，然後選取**建立資料表政策**。
1. 在資源型政策編輯器中，新增要附加的政策，然後選取**建立政策**。
下列 IAM 政策範例允許使用者 {{John}} 對名為 {{MusicCollection}} 的現有資料表執行 [GetItem](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html)、[PutItem](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_PutItem.html)、[UpdateItem](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateItem.html) 與 [UpdateTable](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_UpdateTable.html) API 動作。
請以資源特定資訊取代{{斜體}}文字。
------
#### [ JSON ]
****
```
{
"Version":"2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"AWS": "arn:aws:iam::{{111122223333}}:user/{{username}}"
},
"Action": [
"dynamodb:GetItem",
"dynamodb:PutItem",
"dynamodb:UpdateItem",
"dynamodb:UpdateTable"
],
"Resource": "arn:aws:dynamodb:{{us-east-1}}:{{123456789012}}:table/{{MusicCollection}}"
}
]
}
```
------
## AWS SDK for Java 2.x
下列 IAM 政策範例使用 `putResourcePolicy` 方法，將資源型政策附加到現有資料表。此政策允許使用者在現有資料表上執行 [GetItem](https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_GetItem.html) API 操作。
```
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.dynamodb.DynamoDbClient;
import software.amazon.awssdk.services.dynamodb.model.DynamoDbException;
import software.amazon.awssdk.services.dynamodb.model.PutResourcePolicyRequest;
/**
* Before running this Java V2 code example, set up your development
* environment, including your credentials.
*
* For more information, see the following documentation topic:
*
* [Get started with the AWS SDK for Java 2.x](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html)
*/
public class PutResourcePolicy {
public static void main(String[] args) {
final String usage = """
Usage:
Where:
tableArn - The Amazon DynamoDB table ARN to attach the policy to. For example, arn:aws:dynamodb:us-west-2:{{123456789012}}:table/{{MusicCollection}}.
allowed AWS Principal - Allowed AWS principal ARN that the example policy will give access to. For example, arn:aws:iam::{{123456789012}}:user/{{John}}.
""";
if (args.length != 2) {
System.out.println(usage);
System.exit(1);
}
String tableArn = args[0];
String allowedAWSPrincipal = args[1];
System.out.println("Attaching a resource-based policy to the Amazon DynamoDB table with ARN " +
tableArn);
Region region = Region.US_WEST_2;
DynamoDbClient ddb = DynamoDbClient.builder()
.region(region)
.build();
String result = putResourcePolicy(ddb, tableArn, allowedAWSPrincipal);
System.out.println("Revision ID for the attached policy is " + result);
ddb.close();
}
public static String putResourcePolicy(DynamoDbClient ddb, String tableArn, String allowedAWSPrincipal) {
String policy = generatePolicy(tableArn, allowedAWSPrincipal);
PutResourcePolicyRequest request = PutResourcePolicyRequest.builder()
.policy(policy)
.resourceArn(tableArn)
.build();
try {
return ddb.putResourcePolicy(request).revisionId();
} catch (DynamoDbException e) {
System.err.println(e.getMessage());
System.exit(1);
}
return "";
}
private static String generatePolicy(String tableArn, String allowedAWSPrincipal) {
return "{\n" +
" \"Version\": \"2012-10-17\",\n" +,
" \"Statement\": [\n" +
" {\n" +
" \"Effect\": \"Allow\",\n" +
" \"Principal\": {\"AWS\":\"" + allowedAWSPrincipal + "\"},\n" +
" \"Action\": [\n" +
" \"dynamodb:GetItem\"\n" +
" ],\n" +
" \"Resource\": \"" + tableArn + "\"\n" +
" }\n" +
" ]\n" +
"}";
}
}
```