I have started playing around with db4o but quite soon I have run into a problem of when I remove a link then I have to remove a link somewhere else. Can I enforce constraints, as I can with a relational data开发者_开发技巧base?
Neo4j guarantees that relationships are at all times connected to exactly two nodes: a start node and an end node. In Neo4j relationships are first class citizens, and you don't need to bother about how they are implemented.
央视是哪个频道西非利 33分钟前 来自北京1、央视一共有15个频道，分别是：CCTV-1综合频道、CCTV-2财经频道、CCTV-3综艺频道、CCTV-4中文国际频道、CCTV-5体育频道、CCTV-6电影频道、CCTV-7军事·农业频道、CC
请问买过的朋友，舒提啦旅行箱实际使用体验如何？
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海信ULED电视画质有什么不同的地方?樊倩竹 1天前 来自北京海信ULED电视按照我的理解，就是不同的面板技术，一般来说，ULED有背光，可以实现分区背光；QLED有背光，属于背光灯上覆盖量子膜；OLED无背光，属于自
钉子可以挂的住画框幕布吗360U3082033870 1天前 来自湖北可以。1、厚重的画框幕布挂在墙上的话，你可以给他钉一台钉子，这样的话他可以挂在后面的墙上，相对来说也是比较结实的。2、所以钉子可以挂的住画框幕
103010正在紧张有序的拍摄中，恰逢演员王昌瑞的生日。现场工作人员为他庆生，主演也送上祝福。
It seems to me Apple won\'t allow this, but I need to make sure. For an app we\'re building, we want to ask the user to enter payment information (including credit card details) to pay for tickets. T
I need to generate an XML output using Perl code.I\'m trying not to use any libraries,as it\'s very simple, temporary XML that gets used by another step in the process.
是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
微信重新建群怎么开发者_Go百科建？ 产品名称：苹果手机 产品型号：iPhone 11 系统版本：iOS 13
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