表題の通りNode.jsからDynamoDBのテーブルの作成・削除と行追加・読み取りをメモします。
動作確認した後Qiita掲載用に少々手を入れているのでもしかしたら動かないかもしれません。
テーブルの作成
プライマリキーに「accessKey」を指定する場合
constAWS=require("aws-sdk");AWS.config.update({region:"ap-northeast-1"});// DynamoDB Local使うならendpointの指定が必要constdynamo_opt={apiVersion:'2012-08-10',endpoint:`http://localhost:8000`};constdynamodb=newAWS.DynamoDB(dynamo_opt);constdynamoCreateParams={TableName:"テーブル名",KeySchema:[{AttributeName:"accessKey",KeyType:"HASH"},],AttributeDefinitions:[{AttributeName:"accessKey",AttributeType:"S"}],ProvisionedThroughput:{ReadCapacityUnits:10,WriteCapacityUnits:10}};dynamodb.createTable(dynamoCreateParams,function(err,data){if(err){console.error("Unable to create table. Error JSON:",JSON.stringify(err));}else{console.log("Created table. Table description JSON:",JSON.stringify(data));}});行追加
プライマリキーのaccessKeyに加えuserIdも含めた行を３行追加する。
costtableName="テーブル名";vardynamoDataParams=[{TableName:tableName,Item:{"accessKey":"hoge","userId":1}},{TableName:tableName,Item:{"accessKey":"hage","userId":2}},{TableName:tableName,Item:{"accessKey":"fuga","userId":3}}];varddbClient=newAWS.DynamoDB.DocumentClient(dynamo_opt)varpromises=[];for(leti=0;i<dynamoDataParams.length;i++){(function(i){promises.push(ddbClient.put(dynamoDataParams[i]).promise());})(i);}Promise.all(promises).then(function(){console.log('done');})行の読み取り
constdynamo_opt={apiVersion:'2012-08-10',endpoint:`http://localhost:8000`};constdynamo_params={TableName:"テーブル名",KeyConditionExpression:"accessKey = :a",ExpressionAttributeValues:{":a":"検索文字列"}};constddb=newAWS.DynamoDB.DocumentClient(dynamo_opt);ddb.query(dynamo_params,function(err,data){if(err){console.error('Unable to query:'+JSON.stringify(err));}else{console.log(JSON.stringify(data));}});テーブルの削除
constAWS=require("aws-sdk");AWS.config.update({region:"ap-northeast-1"});// DynamoDB Local使うならendpointの指定が必要constdynamo_opt={apiVersion:'2012-08-10',endpoint:`http://localhost:8000`};constdynamodb=newAWS.DynamoDB(dynamo_opt);dynamodb.deleteTable({TableName:tableName},function(err,data){if(err){console.log("Unable to Delete table. Error JSON:",JSON.stringify(err));}else{console.log("Created table. Table description JSON:",JSON.stringify(data));}});