我想知道AWS开发工具包DynamoDB客户端和DynamoDB DocumentClient之间的区别吗?在哪种用例中,我们应该在DocumentClient上使用DynamoDB客户端?
I want to know the difference between the AWS SDK DynamoDB client and the DynamoDB DocumentClient? In which use case should we use the DynamoDB client over the DocumentClient?
const dynamoClient = new AWS.DynamoDB.DocumentClient(); vs const dynamo = new AWS.DynamoDB();推荐答案
我认为这是最好的答案通过比较两个做相同事情的代码示例。
I think this can be best answered by comparing two code samples which do the same thing.
这是使用dynamoDB客户端放置项目的方式:
Here's how you put an item using the dynamoDB client:
var params = { Item: { "AlbumTitle": { S: "Somewhat Famous" }, "Artist": { S: "No One You Know" }, "SongTitle": { S: "Call Me Today" } }, TableName: "Music" }; dynamodb.putItem(params, function (err, data) { if (err) console.log(err) else console.log(data); });以下是使用DocumentClient API放置同一项目的方法:
Here's how you put the same item using the DocumentClient API:
var params = { Item: { "AlbumTitle": "Somewhat Famous", "Artist": "No One You Know", "SongTitle": "Call Me Today" }, TableName: "Music" }; var documentClient = new AWS.DynamoDB.DocumentClient(); documentClient.put(params, function (err, data) { if (err) console.log(err); else console.log(data); });在 DocumentClient 中可以看到 Item 以更自然的方式指定。在所有其他更新DDB的操作( update(), delete())和返回的项目中也存在类似的区别从读取操作( get(), query(), scan())。
As you can see in the DocumentClient the Item is specified in a more natural way. Similar differences exist in all other operations that update DDB (update(), delete()) and in the items returned from read operations (get(), query(), scan()).
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AWS开发工具包DynamoDB客户端和DocumentClient之间的区别?
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