MongoDB Java拉

Question

我尝试删除嵌入式文档而没有成功.我正在寻找以下指令的java方式:

db.games.update({'_id': 73}, {$pull: {'goals': {'goal': 4}}})

Answer 1

Java文档非常清楚,您只需构建BSON对象以匹配shell中使用的各自JSON对应项:

    BasicDBObject query = new BasicDBObject("_id", 73);
    BasicDBObject fields = new BasicDBObject("goals", 
        new BasicDBObject( "goal", 4));
    BasicDBObject update = new BasicDBObject("$pull",fields);

    games.update( query, update );