1
我蒙戈集合包含下列文件蒙戈和Java讀取嵌套文檔值
{
"syslog": [
{
"alertId": "N/A",
"time": "06:46:57",
"device": "10.10.20.1"
},
{
"alertId": "N/A",
"time": "06:47:30",
"device": "10.10.20.2"
}
]
}
現在我想讀給設備的唯一值。
假設如果我設置設備=「10.10.20.2」這將只顯示"alertId": "N/A", "time": "06:47:30", "device": "10.10.20.2"
爲了這個,我編寫Java代碼如下
BasicDBObject criteria = new BasicDBObject();
criteria.put("syslog.device","10.10.20.2");
DBCursor cur = coll.find(criteria);
while(cur.hasNext() && !isStopped()) {
String json = cur.next().toString();
}//end of while
當我打印JSON它讓我整個的JSON值。我應該如何找到給定設備的選定值?
你是什麼意思與'當我打印JSON它讓我整個JSON values'你應該作如下更新查詢? –
不打印整個JSON,選擇你想要的字段,然後再將其轉換爲字符串 –