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class Categlog(Model):
   ................
   blog = models.ForeignKey(Blog)
   ..................

class Entry(Model):
   ................
   blog = models.ForeignKey(Blog)
   ..................
ÀíÂÛÉÏÀ´½²£¬Á½¸öÄ£ÐÍÉú³ÉµÄÊý¾Ý¿â¶¼Ó¦¸ÃÓÐÒ»¸öBlog_idµÄÍâ¼ü£¬²¢Óëblog±í²úÉú²ÎÕÕ¹Øϵ¡£
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CREATE TABLE `blog_catelog` (
    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
    .....................................
    `blog_id` integer NOT NULL
   ......................................
);
ALTER TABLE `blog_catelog` ADD CONSTRAINT blog_id_refs_id_4688511d FOREIGN
KEY (
`blog_id`) REFERENCES `blog_blog` (`id`);

CREATE TABLE `blog_entry` (
    `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY,
    .................................
    `blog_id` integer NOT NULL REFERENCES `blog_blog` (`id`),
    .................................
);
ͨ¹ýÉÏÃæµÄ½Å±¾¿´µ½£¬catelogµÄ±íÉú³ÉÁËÒ»¸öForeign key¡£¶øentry±íûÓУ¬½ö½öÊÇReferencesÁËÒ»ÏÂblogµÄ±í¡£
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