我是CouchBase的新手。我有几个简单的文件:
1. {
"docType": "DeviceData",
"id": "57 0F 75 00 C8 0B@2013-06-26 23:59:38.979",
"time": 1372271378979,
"group": "London"
}
2. {
"docType": "DeviceData",
"id": "57 0F 75 00 C8 0B@2013-06-27 10:02:46.197",
"time": 1372307566197,
"group": "Bristol"
}
3. {
"docType": "DeviceData",
"id": "57 0F 75 00 C8 0B@2013-06-27 10:03:36.4",
"time": 1372307616400,
"group": "Bristol"
}
我要求查询组和时间。例如,我想用group = Bristol获取所有文件,时间从1372307616100到1372307616500。所以我处理我应该得到3个文档中的2个。
所以我创建了视图:
function (doc, meta) {
if(doc.docType == "DeviceData")
emit([doc.group, doc.time], doc);
}
在java代码中设置查询如下:
String str = "[\"Bristol\", 1372307566100]";
String end = "[\"Bristol\", 1372307616500]";
query.setRange(str, end);
List<DeviceData> deviceData = cbStore.getView("getDevices", DeviceData.class, query);
但获得零文件。
请让我知道我有什么不对吗?需要帮助谢谢。
* 编辑: 我尝试使用复杂的键,如下所示,但没有运气。
ComplexKey startKey = ComplexKey.of("Bristol", "1372307566100");
ComplexKey endKey = ComplexKey.of("Bristol", "1372307616500");
答案 0 :(得分:5)
问题是你的对象中的时间很长,而不是字符串:
query.setStale(Stale.FALSE);
long firstParameter=1372307566197l;
long secondParameter=1372307616400l;
//["Bristol",1372307566197]
ComplexKey startKey = ComplexKey.of("Bristol", firstParameter);
//["Bristol",1372307616400]
ComplexKey endKey = ComplexKey.of("Bristol", secondParameter);
query.setRange(startKey, endKey);
ViewResponse result = client.query(view, query);
Iterator<ViewRow> iter = result.iterator();
while(iter.hasNext()) {
ViewRow row = iter.next();
System.out.println( row.getId()); // ID of the document
System.out.println(row.getKey()); // Key of the view row
System.out.println(row.getValue()); // Value of the view row
System.out.println(row.getDocument()); // Full document if included
}