2
,而我試圖讀取從MongoDB中我得到這個異常數據
,java.lang.IllegalStateException:開放
java.lang.IllegalStateException: open
at org.bson.util.Assertions.isTrue(Assertions.java:36)
at com.mongodb.DBTCPConnector.isMongosConnection(DBTCPConnector.java:369)
at com.mongodb.Mongo.isMongosConnection(Mongo.java:645)
at com.mongodb.DBCursor._check(DBCursor.java:454)
at com.mongodb.DBCursor._hasNext(DBCursor.java:546)
at com.mongodb.DBCursor.hasNext(DBCursor.java:571)
at com.calsoftlabs.mongo.client.impl.ReadingData.main(ReadingData.java:93)
mycode的
public static DBCursor firstRecord(String ip) throws Exception {
DBObject query = new BasicDBObject("client_ip", ip);
DBCollection collection = getConnection();
DBObject obj = new BasicDBObject("_id", 1);
DBCursor cursor = collection.find(query).sort(obj).limit(1);
mongo.close();
return cursor;
}
DBCursor cursor = ReadingData.firstRecord(ip);
while (cursor.hasNext()) {
cursor.next();
myList.add(new BasicDBObject("client_ip", (String) cursor.curr().get(
"client_ip")).append("timestamp",
(String) cursor.curr().get("timestamp")).append("total_traffic",
(String) cursor.curr().get("total_traffic")));
}
通過使用上面的代碼我讀取Mongodb中記錄集的第一條記錄,但是引起IllegalStateException的行cursor.hasNext()
。請建議我如何解決這個問題..
這'mongo.close();'是可疑的,你想後,使用DB ... – 2015-02-11 06:28:26
又見HTTPS://jira.mongodb .ORG /瀏覽/ JAVA-1251 – 2015-02-11 06:31:54