[一对一关联](%E4%B8%80%E5%AF%B9%E4%B8%80%E5%85%B3%E8%81%94.md) [一对多关联](%E4%B8%80%E5%AF%B9%E5%A4%9A%E5%85%B3%E8%81%94.md) [远程一对多](%E8%BF%9C%E7%A8%8B%E4%B8%80%E5%AF%B9%E5%A4%9A.md) [多对多关联](%E5%A4%9A%E5%AF%B9%E5%A4%9A%E5%85%B3%E8%81%94.md) [多态关联](%E5%A4%9A%E6%80%81%E5%85%B3%E8%81%94.md)