使用 ExclusiveStartKey 选项进行 AWS Dynamodb 扫描

对于我最近的项目，我试图从 dynamodb 获取数据。除了我在参数中添加“exclusiveStartKey”选项之外，似乎一切正常。

下面是我的代码。

function scanDataFromDB(datetime) {
let params = {
    TableName: TABLE_NAME,
    IndexName: "main-index",
    Select: "ALL_ATTRIBUTES",
    ExclusiveStartKey: {
        "message_id": { "S": "20161011175258875925351560"}
    },
    ExpressionAttributeNames: {
        "#f_up": "date_updated"
    },
    ExpressionAttributeValues: {
        ":s_time": "2016-10-11 00:00:00",
        ":e_time": "2016-10-11 23:59:59"
    },
    FilterExpression: "#f_up between :s_time and :e_time",
    ScanIndexForward: "true"
};
console.log(params);
docClient.scan(params, function(err, data) {
    if(err) {
        console.log(JSON.stringify(err, null, 2));
        //callback(err, null);
    } else {
        console.log(JSON.stringify(data, null, 2));
        //callback(null, err);
    }
})
}

这会不断返回“提供的启动密钥无效。”

我发现了问题所在。我花了将近一周的时间。如果存在带有分区键的排序键，“ExclusiveStartKey”选项必须同时指示分区键和排序键。

function scanDataFromDB(datetime) {
let params = {
    TableName: TABLE_NAME,
    IndexName: "main-index",
    Select: "ALL_ATTRIBUTES",
    ExclusiveStartKey: {
        "message_id": "20161012114321726034249204",
        "date_updated": "2016-10-12 11:44:09"         
    },
    ExpressionAttributeNames: {
        "#f_up": "date_updated"
    },
    ExpressionAttributeValues: {
        ":s_time": "2016-10-11 00:00:00",
        ":e_time": "2016-10-11 23:59:59"
    },
    FilterExpression: "#f_up between :s_time and :e_time",
    ScanIndexForward: "true"
};
console.log(params);
docClient.scan(params, function(err, data) {
    if(err) {
        console.log(JSON.stringify(err, null, 2));
        //callback(err, null);
    } else {
        console.log(JSON.stringify(data, null, 2));
        //callback(null, err);
    }
})

}