{"id":337919,"date":"2023-01-16T16:56:53","date_gmt":"2023-01-16T08:56:53","guid":{"rendered":"https:\/\/www.idc.net\/help\/337919\/"},"modified":"2023-01-16T16:56:53","modified_gmt":"2023-01-16T08:56:53","slug":"%e4%b8%80%e6%97%a5%e4%b8%80%e6%8a%80%ef%bc%9a%e5%9c%a8python%e9%87%8c%e9%9d%a2%e5%ae%9e%e7%8e%b0%e9%93%be%e5%bc%8f%e8%b0%83%e7%94%a8","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/337919\/","title":{"rendered":"\u4e00\u65e5\u4e00\u6280\uff1a\u5728Python\u91cc\u9762\u5b9e\u73b0\u94fe\u5f0f\u8c03\u7528"},"content":{"rendered":"

[[387344]]<\/span><\/p>\n

\u6211\u4eec\u5728\u4f7f\u7528Django\u7684models\u67e5\u8be2\u6570\u636e\u5e93\u65f6\uff0c\u53ef\u4ee5\u770b\u5230\u6709\u8fd9\u79cd\u5199\u6cd5\uff1a<\/p>\n

\n \n \n \n 
    \n  \n  \n  \n  
  1. form app.models import XXX <\/span><\/span><\/li>\n  \n  \n  \n  
  2. query = XXX.objects.all<\/span>() <\/span><\/span><\/li>\n  \n  \n  \n  
  3. query = query.filter(name<\/span>=123, age=456).filter(salary=999) <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
    \u5728\u8fd9\u79cd\u5199\u6cd5\u91cc\u9762\uff0cquery\u5bf9\u8c61\u6709\u4e00\u4e2afilter\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u8fd4\u56de\u6570\u636e\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u8c03\u7528filter\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8fd9\u6837\u65e0\u9650\u5236\u5730\u8c03\u7528\u4e0b\u53bb\u3002<\/p>\n
    \u8fd9\u79cd\u5199\u6cd5\u662f\u600e\u4e48\u5b9e\u73b0\u7684\u5462?<\/p>\n
    \u5982\u679c\u6211\u4eec\u76f4\u63a5\u5199\u4e00\u4e2a\u7c7b\u7684\u65b9\u6cd5\uff0c\u770b\u770b\u80fd\u4e0d\u80fd\u8fd9\u6837\u8c03\u7528\uff1a<\/p>\n
    \n \n \n \n 
      \n  \n  \n  \n  
    1. class Query: <\/span><\/span><\/li>\n  \n  \n  \n  
    2.     def filter(self): <\/span><\/li>\n  \n  \n  \n  
    3.         pass <\/span><\/li>\n  \n  \n  \n  
    4.  <\/span><\/li>\n  \n  \n  \n  
    5. query = Query() <\/span><\/li>\n  \n  \n  \n  
    6. query.filter().filter() <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
      \n
      \u76f4\u63a5\u5bf9query.filter()\u8fd4\u56de\u7684\u7ed3\u679c\u518d\u8c03\u7528\u4e00\u6b21filter\uff0c\u5c31\u4f1a\u5bfc\u81f4\u62a5\u9519\u4e86\u3002\u8fd9\u662f\u56e0\u4e3a\u5728\u6ca1\u6709\u663e\u5f0f\u5199return\u8bed\u53e5\u7684\u65f6\u5019\uff0c\u65b9\u6cd5\u4f1a\u8fd4\u56deNone\uff0c\u800cNone\u5bf9\u8c61\u662f\u6ca1\u6709\u6240\u8c13\u7684filter\u65b9\u6cd5\u7684\u3002<\/p>\n
      \u90a3\u4e48\u4ec0\u4e48\u4e1c\u897f\u6709filter\u65b9\u6cd5\u5462?\u663e\u7136\u6211\u4eec\u7684query\u5bf9\u8c61\u6709filter\u65b9\u6cd5\u3002\u90a3\u4e48\u5982\u4f55\u8ba9\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u81ea\u8eab\u8fd9\u4e2a\u5bf9\u8c61\u5462?<\/p>\n
      \u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u4eec\u5c31\u8981\u770b\u770b\u6211\u4eec\u5728\u5b9a\u4e49\u7c7b\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u603b\u4f1a\u5199\u7684\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570self\u4e86\u3002\u51e0\u4e4e\u6bcf\u4e2a\u7c7b\u65b9\u6cd5\u91cc\u9762\u90fd\u4f1a\u6709\u5b83\u3002\u5927\u5bb6\u53ea\u77e5\u9053\u5728\u7c7b\u91cc\u9762\u8c03\u7528\u7c7b\u65b9\u6cd5\u7684\u65f6\u5019\u53ef\u4ee5\u7528self.xxx()\uff0c\u5728\u8c03\u7528\u7c7b\u5c5e\u6027\u7684\u65f6\u5019\u53ef\u4ee5\u7528self.yy\uff0c\u90a3\u4e48\u6709\u6ca1\u6709\u601d\u8003\u8fc7\uff0c\u8fd9\u4e2a\u4e1c\u897f\u5982\u679c\u5355\u72ec\u4f7f\u7528\u4f1a\u600e\u4e48\u6837\u5462?<\/p>\n
      \u5b9e\u9645\u4e0a\uff0cself\u6307\u7684\u5c31\u662f\u8fd9\u4e2a\u7c7b\u5b9e\u4f8b\u5316\u6210\u4e00\u4e2a\u5bf9\u8c61\u4ee5\u540e\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u81ea\u8eab\u3002\u800c\u8fd9\u4e2a\u5bf9\u8c61\u663e\u7136\u662f\u6709filter\u65b9\u6cd5\u7684\u3002\u6240\u4ee5\u6211\u4eec\u4fee\u6539\u4e00\u4e0bfilter\u65b9\u6cd5\uff0c\u8ba9\u5b83\u8fd4\u56deself:<\/p>\n
      \n \n \n \n 
        \n  \n  \n  \n  
      1. class Query: <\/span><\/span><\/li>\n  \n  \n  \n  
      2.     def filter(self): <\/span><\/li>\n  \n  \n  \n  
      3.         return<\/span> self <\/span><\/span><\/li>\n  \n  \n  \n  
      4.  <\/span><\/li>\n  \n  \n  \n  
      5. query = Query() <\/span><\/li>\n  \n  \n  \n  
      6. query.filter().filter() <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
        \n
        \u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u73b0\u5728\u5df2\u7ecf\u4e0d\u4f1a\u62a5\u9519\u4e86\u3002\u90a3\u4e48\u56de\u5230\u6700\u5f00\u59cb\u7684\u95ee\u9898\uff0cDjango\u91cc\u9762\u7684\u94fe\u5f0f\u8c03\u7528\u4f20\u5165\u67e5\u8be2\u53c2\u6570\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u5462?<\/p>\n
        \u5b9e\u9645\u4e0a\u8fd9\u91cc\u6d89\u53ca\u5230\u4e00\u4e2a\u60f0\u6027\u67e5\u8be2\u7684\u95ee\u9898\u3002<\/p>\n
        \u5f53\u6211\u4eec\u4e0d\u505c\u8c03\u7528.filter()\u65b9\u6cd5\u7684\u65f6\u5019\uff0cDjango\u4f1a\u628a\u8fd9\u4e9b\u67e5\u8be2\u6761\u4ef6\u5168\u90e8\u7f13\u5b58\u8d77\u6765\uff0c\u53ea\u6709\u5f53\u6211\u4eec\u9700\u8981\u83b7\u53d6\u7ed3\u679c\uff0c\u6216\u8005\u67e5\u8be2\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\u636e\u6709\u591a\u5c11\u6761\u65f6\uff0c\u5b83\u624d\u4f1a\u771f\u6b63\u5730\u8fde\u63a5\u6570\u636e\u5e93\u53bb\u67e5\u8be2\u3002<\/p>\n
        \u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u8981\u6a21\u62df\u8fd9\u4e2a\u73af\u5883\uff0c\u628a\u67e5\u8be2\u6761\u4ef6\u7f13\u5b58\u8d77\u6765\u3002<\/p>\n
        \u90a3\u4e48\u4e3a\u4e86\u83b7\u53d6\u8c03\u7528\u65b9\u6cd5\u65f6\u4f20\u5165\u7684\u53c2\u6570\u540d\uff0c\u6211\u4eec\u5c31\u8981\u4f7f\u7528**kwargs\u53c2\u6570\u3002\u8fd9\u4e2a\u53c2\u6570\u53ef\u4ee5\u63a5\u53d7\u6240\u6709\u7684key=value\u5f62\u5f0f\u7684\u53c2\u6570\uff1a<\/p>\n
        \n \n \n \n 
          \n  \n  \n  \n  
        1. class Query(): <\/span><\/span><\/li>\n  \n  \n  \n  
        2.     def __init__(self): <\/span><\/li>\n  \n  \n  \n  
        3.         self.query_condition = {} <\/span><\/li>\n  \n  \n  \n  
        4.  <\/span><\/li>\n  \n  \n  \n  
        5.     def filter(self, **kwargs): <\/span><\/li>\n  \n  \n  \n  
        6.         self.query_condition.update<\/span>(kwargs) <\/span><\/span><\/li>\n  \n  \n  \n  
        7.         return<\/span> self <\/span><\/span><\/li>\n  \n  \n  \n  
        8.          <\/span><\/li>\n  \n  \n  \n  
        9. query = Query() <\/span><\/li>\n  \n  \n  \n  
        10. a = query.filter(name<\/span>=<\/span>'kingname'<\/span>).filter(age__gt=15, address=<\/span>'yyyyyy'<\/span>).filter(salary=99999) <\/span><\/span><\/li>\n  \n  \n  \n  
        11. print(query.query_condition) <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
          \u8fd0\u884c\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<\/p>\n
           <\/p>\n
          \u5728\u771f\u6b63\u9700\u8981\u8f93\u51fa\u7ed3\u679c\u7684\u65f6\u5019\uff0c\u518d\u4f7f\u7528\u8fd9\u4e9b\u7f13\u5b58\u7684\u6761\u4ef6\uff0c\u53bb\u6570\u636e\u5e93\u4e2d\u67e5\u8be2\u7ed3\u679c\u5373\u53ef\u3002<\/p>\n
          \u672c\u6587\u8f6c\u8f7d\u81ea\u5fae\u4fe1\u516c\u4f17\u53f7\u300c\u672a\u95fbCode\u300d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e8c\u7ef4\u7801\u5173\u6ce8\u3002\u8f6c\u8f7d\u672c\u6587\u8bf7\u8054\u7cfb\u672a\u95fbCode\u516c\u4f17\u53f7\u3002<\/p>\n
          \n
           <\/p>\n","protected":false},"excerpt":{"rendered":"
          [[387344]] \u6211\u4eec\u5728\u4f7f\u7528Django\u7684models\u67e5\u8be2\u6570\u636e\u5e93\u65f6\uff0c\u53ef\u4ee5\u770b\u5230\u6709\u8fd9\u79cd\u5199\u6cd5\uff1a form&nbs […]<\/p>\n","protected":false},"author":1,"featured_media":337920,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[],"class_list":["post-337919","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-website"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/337919","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=337919"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/337919\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media\/337920"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=337919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=337919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=337919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}