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  • JAVA-查看MongoDB中的数据(包含Map集合)

    package com.xinsight.server;
    
    import java.net.UnknownHostException;
    import java.util.HashMap;
    
    import com.mongodb.BasicDBObject;
    import com.mongodb.DB;
    import com.mongodb.DBCollection;
    import com.mongodb.DBCursor;
    import com.mongodb.Mongo;
    /**
     *查找Mongodb中某一列包含Map集合的所有数据 
     */
    public class FindMongodbMap {
        private static Mongo mg ;
        private static DB db;
        private static int num = 0;
        public static void main(String args[]){
            try {
                mg = new Mongo("localhost",27017);
                db = mg.getDB("admin");
                boolean auth = db.authenticate("aa","aa".toCharArray() );
                if(!auth){
                    System.err.println("链接Mongodb失败");
                }else{
                    db = mg.getDB("zq1");
                    DBCollection collection = db.getCollection("zq1");
                    DBCursor u = collection.find();
                    while(u.hasNext()){
                        num++;
                        BasicDBObject basi = (BasicDBObject)u.next();
                        HashMap map = (HashMap)basi.get("m");
                        if(num % 100 == 0){
                            System.err.println("--------------------------------------------------------------------");
                            Thread.sleep(3000);
                        }
                        System.out.println(basi.get("v1") + "    " + basi.get("v2") + "    " +basi.get("v3") + "    " +basi.get("v4") + "    " + map.get("time") + "    " + map.get("sex") + "    " + map.get("age") + "    " + map.get("name"));
                    }
                    System.out.println("共找到:" + num + "条数据");
                }
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/zqzdong/p/4839009.html
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