MongoDB:使用JAVA将字符串字段转换为Int
我正在学习mongoDB。我有一个像这样的收藏:MongoDB:使用JAVA将字符串字段转换为Int,java,mongodb,mongodb-query,Java,Mongodb,Mongodb Query,我正在学习mongoDB。我有一个像这样的收藏: { "_id" : ObjectId("558cf353209c021b5a2fcbe5"), "term" : "gamma red eye tennis dampener", "year" : "2015", "month" : "05", "day" : "29", "hour" : "09", "dayofyear" : "176", "weekofyear" : "26",
{
"_id" : ObjectId("558cf353209c021b5a2fcbe5"),
"term" : "gamma red eye tennis dampener",
"year" : "2015",
"month" : "05",
"day" : "29",
"hour" : "09",
"dayofyear" : "176",
"weekofyear" : "26",
"productcount" : "1",
"count" : "1"
}
{
"_id" : ObjectId("578cf353209c021b5a2fcbe5"),
"term" : "tennis dampener",
"year" : "2015",
"month" : "05",
"day" : "29",
"hour" : "09",
"dayofyear" : "176",
"weekofyear" : "26",
"productcount" : "1",
"count" : "7"
}
{
"_id" : ObjectId("568cf353209c021b5a2fcbe5"),
"term" : "gamma ",
"year" : "2015",
"month" : "05",
"day" : "29",
"hour" : "09",
"dayofyear" : "176",
"weekofyear" : "26",
"productcount" : "1",
"count" : "4"
}
这里的字段count是字符串。我希望遍历所有文档,并使用JAVA将其转换为INT
我可以通过控制台使用以下命令执行此操作:
db.tq.find().forEach(function(obj) {
obj.count= NumberInt(obj.count);
db.tq.save(obj);
})
如何在java中实现它?您应该这样做-
DBCollection collection = db.getCollection("collection");
BasicDBObject document = new BasicDBObject();
DBCursor cursor = collection.find();
while (cursor.hasNext()) {
DBObject cur = cursor.next();
String id = cur.get("_id").toString();
String c = cur.get("count").toString();
int updateCount = Integer.parseInt(c); //change to int
BasicDBObject updateQuery = new BasicDBObject();
updateQuery.append("$set", new BasicDBObject().append("count", updateCount));
BasicDBObject searchQuery = new BasicDBObject();
searchQuery.put("_id", new ObjectId(id));
collection.update(searchQuery, updateQuery);
}
整数.parseInt(字符串)