如何在使用數組的FilterExpression中使用「IN」語句 - dynamodb

Question

檢查過AWS文檔，但沒有找到任何工作示例。

這是我嘗試

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 

      } 
      }); 

了記錄，但它是取它具有ID 1紀錄，但我想用數組這樣

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 

     } 
     }); 

怎樣才能使上面的代碼爲working.want獲取記錄。語法沒有錯誤糾正和查詢運行，但我沒有得到記錄

Answer 1

請參閱本answer

摘要： -

對於「IN」的條款固定數量的值： -

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

對於陣列和動態形成FilterExpression多種元素： -

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 
}; 

Answer 2

notionquest的答案是正確的，但我不能用我的其他值ExpressionAttributeValues像:country和:status所以這裏被修改的答案，使其工作按我的要求

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 

    } 
    });