使用 Java 从 mongodb 中检索数组值
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Retrieve array values from mongodb with Java
提问by
i have the following code :
我有以下代码：
DBCollection collsc = db.getCollection("StudentCourses") ;
BasicDBObject querysc = new BasicDBObject("StudentID",id );
DBCursor curssc = collsc.find(querysc);
while(curssc.hasNext()) {
DBObject e = curssc.next();
System.out.println("You are currently registered for the following modules: ") ;
System.out.println(e.get("CoursesRegistered")) ;
}
This outputs:
这输出：
You are currently registered for the following modules:
[ "DigitalLogic" "OperatingSystems" , "FundamentalsCSE"]
However i want only the values to be returned from the array, i.e, DigitalLogic, OperatingSystems and FundamentalsCSE. I will use these values to populate a JList. Help please?
但是，我只希望从数组中返回值，即 DigitalLogic、OperatingSystems 和 FundamentalsCSE。我将使用这些值来填充 JList。请帮忙？
采纳答案by Zoon Nooz
Try to use
尝试使用
BasicDBList e = (BasicDBList) curssc.next().get("CoursesRegistered");
instead of
代替
DBObject e = curssc.next();
and then get value from e.getIndex(index);
然后从 e.getIndex(index) 获取值；
