MongoDB Java拉 [英] MongoDB Java pull

问题描述

我尝试删除嵌入式文档但没有成功。
我正在寻找以下指令的java方式：

i tried to remove an embedded document without succcess. I'm looking for the java way of following instruction:

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

推荐答案

Java文档很清楚，你只是在构建BSON对象以匹配shell中使用的各自的JSON对应物：

The Java documentation is pretty clear, you are just constructing BSON objects to match their respective JSON counterparts as used in the shell:

    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 );

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