使用 Lambda 删除 Dynamodb 中的所有项目？

Question

使用 Lambda (node.js) - 如何删除 Dynamodb 表中的所有项目？

表中有 500K 行

我尝试使用扫描方法，然后循环遍历每个项目，然后使用删除方法。它最多只允许 3000 行。

代码

exports.handler = function(context, callback) {
  getRecords().then((data) => {
    data.Items.forEach(function(item) {
      deleteItem(item.Id).then((data1) => {

      });
    });
  });
};

var deleteItem = function(id) {
  var params = {
    TableName: "TableName",
    Key: {
      "Id": id
    },
  };

  return new Promise(function(resolve, reject) {
    client.delete(params, function(err, data) {
      if (err) {
        reject(err);
      } else {
        resolve();
      }
    });
  });
}


function getRecords() {
  var params = {
    TableName: 'TableName',
    IndexName: 'Type-index',
    KeyConditionExpression: 'Type = :ty',
    ExpressionAttributeValues: {
      ':ty': "1"
    },
    ProjectionExpression: "Id",
  };

  return new Promise(function(resolve, reject) {
    client.query(params, function(err, data) {
      if (err) {
        reject(err);
      } else {
        resolve(data);
      }
    });
  });
}

Answer 1

已经有一个正确答案，但这里有另一个代码片段，用于从 Dynamo DB 中删除所有记录。

const AWS = require("aws-sdk");

AWS.config.update({
  region: "us-east-1",
});

const docClient = new AWS.DynamoDB.DocumentClient();
const getAllRecords = async (table) => {
  let params = {
    TableName: table,
  };
  let items = [];
  let data = await docClient.scan(params).promise();
  items = [...items, ...data.Items];
  while (typeof data.LastEvaluatedKey != "undefined") {
    params.ExclusiveStartKey = data.LastEvaluatedKey;
    data = await docClient.scan(params).promise();
    items = [...items, ...data.Items];
  }
  return items;
};
const deleteItem = (table, id) => {
  var params = {
    TableName: table,
    Key: {
      id: id,
    },
  };

  return new Promise(function (resolve, reject) {
    docClient.delete(params, function (err, data) {
      if (err) {
        console.log("Error Deleting ", id,err);
        reject(err);
      } else {
        console.log("Success Deleting ", id,err);
        resolve();
      }
    });
  });
};
exports.handler = async function (event, context, callback) {
  try {
    const tableName = "<table>";
    // scan and get all items
    const allRecords = await getAllRecords(tableName);
    // delete one by one 
    for (const item of allRecords) {
      await deleteItem(tableName, item.id);
    }
    callback(null, {
      msg: "All records are deleted.",
    });
  } catch (e) {
    callback(null, JSON.stringify(e, null, 2));
  }
};