如何使用节点js在Cassandra中插入动态值以选择查询（对于日期范围）

Question

var result =＆＃39;选择来自people.users的消息，其中event_time＆gt; ？和event_time＆lt; ？允许过滤＆＃39;;

client.execute(result,[startdate,enddate], function(err,result)

这显示不起作用：

GET /favicon.ico 500 17.785 ms - 386
{ [ResponseError: Expected 8 or 0 byte long for date (10)]
  name: 'ResponseError',
  message: 'Expected 8 or 0 byte long for date (10)',
  info: 'Represents an error message from the server',
  code: 8704,
  query: 'select message from people.users where event_time > ? and event_time <
 ? allow filtering' }

Answer 1

Cassandra预期的类型（时间戳）与提供的值之间存在不匹配（看起来它不是Ecmascript Date）。

应该是这样的：

var startDate = new Date('2015-01-01');
var endDate = new Date();
var query = 'select message from people.users where event_time > ?' +
            ' and event_time < ? allow filtering';
client.execute(query, [startDate, endDate], { prepare: true}, callback);

另外，you should use the prepare flag for best performance and for accurate type mapping between Ecmascript and Cassandra。