如何使用数组在 FilterExpression 中使用“IN”语句 - dynamodb

Question

检查了 AWS 文档，但没有找到任何工作示例。

这是我的尝试

var params = {
            TableName: "User",
            IndexName:"a-b-index",
            KeyConditionExpression: "Country = :country and #s = :status",
            FilterExpression: "Id IN (:e)",
            ExpressionAttributeValues: {
              ":country ": "USA",
              ":status": 1,
              ":e": "1"

            },
            ExpressionAttributeNames: {"#s": "Status"}
          };

          //get users
          dynamodb.query(params, function (err, data) {
            if (err)
              //error
            else {
              //success

            }
          });

有记录，但它正在获取 id 为 1 的记录，但我想使用这样的数组

 var params = {
        TableName: "User",
        IndexName:"a-b-index",
        KeyConditionExpression: "Country = :country and #s = :status",
        FilterExpression: "Id IN (:e)",
        ExpressionAttributeValues: {
          ":country ": "USA",
          ":status": 1,
          ":e": ["1","2","3"]

        },
        ExpressionAttributeNames: {"#s": "Status"}
      };

      //get users
      dynamodb.query(params, function (err, data) {
        if (err)
          //error
        else {
          //success

        }
       });

如何使上述代码正常工作。想要获取记录。语法正确，查询运行没有错误，但我没有得到记录

原文由 Nirmal Goswami 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

请参考这个 答案

概括：-

对于“IN”子句中固定数量的值：-

 var params = {
    TableName : "Users",
    FilterExpression : "username IN (:user1, :user2)",
    ExpressionAttributeValues : {
        ":user1" : "john",
        ":user2" : "mike"
    }
};

对于数组中的更多元素并动态形成 FilterExpression：-

 var titleValues = ["The Big New Movie 2012", "The Big New Movie"];
var titleObject = {};
var index = 0;
titleValues.forEach(function(value) {
    index++;
    var titleKey = ":titlevalue"+index;
    titleObject[titleKey.toString()] = value;
});

var params = {
    TableName : "Movies",
    FilterExpression : "title IN ("+Object.keys(titleObject).toString()+ ")",
    ExpressionAttributeValues : titleObject
};

原文由 notionquest 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

notionquest 的答案是正确的，但我不能在 ExpressionAttributeValues 例如 :country 和 :status 使其按照我的要求修改后的答案在这里工作

var AttributeValuesObject = {};

  AttributeValuesObject[':country '] = "USA";
  AttributeValuesObject[':status'] = 1;

  var titleValues = ["1", "2"];
  var titleObject = {};

  var index = 0;

  titleValues.forEach(function(value) {
    index++;
    var titleKey = ":titleValue"+index;
    AttributeValuesObject[titleKey.toString()] = value;
    titleObject[titleKey.toString()] = value;
  });

  var params = {
    TableName: "User",
    IndexName:"a-b-index",
    KeyConditionExpression: "Country = :country and #s = :status",
    FilterExpression: "Id IN ("+Object.keys(titleObject).toString()+ ")",
    ExpressionAttributeValues: AttributeValuesObject,
    ExpressionAttributeNames: {"#s": "Status"}
  };

  //get users
  dynamodb.query(params, function (err, data) {
    if (err)
      //error
    else {
      //success

    }
   });

原文由 Nirmal Goswami 发布，翻译遵循 CC BY-SA 3.0 许可协议