Question

mongodb 按照条件查询，如何把这条查询出来的记录里的字段如email的值提取出来，保存为String类型

BasicDBObject doc = new BasicDBObject() ;
doc.put("name","zhangsan") ;
doc.put("password","123456") ;
//查找第一条符合条件的记录
DBObject myDoc = coll.findOne(doc);
按照name和password查询出一条记录，这条记录里有email字段，如何把这个字段提取出来，转换成String类型？？？？

Answer 1

String email = "";
if(myDoc.containsField("email")){
Object email_ = myDoc.get("email");
if(email_ instanceof String){
email = (String)email_ ;
}else {
email = email_.toString();
}
}