{"id":1224,"date":"2025-01-15T12:01:49","date_gmt":"2025-01-15T04:01:49","guid":{"rendered":"http:\/\/www.chan.ink\/?p=1224"},"modified":"2025-01-18T17:46:54","modified_gmt":"2025-01-18T09:46:54","slug":"%e3%80%90sql%e3%80%91%e5%85%b3%e4%ba%8e%e9%80%bb%e8%be%91%e5%88%a0%e9%99%a4","status":"publish","type":"post","link":"http:\/\/www.chan.ink\/index.php\/2025\/01\/15\/%e3%80%90sql%e3%80%91%e5%85%b3%e4%ba%8e%e9%80%bb%e8%be%91%e5%88%a0%e9%99%a4\/","title":{"rendered":"\u3010SQL\u3011\u5173\u4e8e\u903b\u8f91\u5220\u9664"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li>\u5220\u9664\u7ea7\u522b\u65f6\uff0c\u5224\u65ad\u4e0b\u5c5e\u5982\u679c\u8fd8\u6709\u6570\u636e\uff0c\u5219\u4e0d\u5141\u8bb8\u88ab\u5220\u9664\u3002<\/li>\n\n\n\n<li>\u81ea\u52a8\u5c06\u7ea7\u522b\u8bbe\u7f6e\u4e3a\u67d0\u4e2a\u7ea7\u522b\u3002<\/li>\n\n\n\n<li>\u5c06\u7ea7\u522b\u8bbe\u7f6e\u4e3a\u7a7a\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bd4\u5982\u6709\u4e24\u4e2a\u8868\uff0c\u5206\u522b\u662f\u7ea7\u522b\u8868\u548c\u5ba2\u6237\u8868\uff0c\u4e24\u4e2a\u8868\u7684\u5220\u9664\uff0c\u90fd\u662f\u903b\u8f91\u5220\u9664\u800c\u975e\u7269\u7406\u5220\u9664<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u4e2d\uff0c\u5ba2\u6237\u8868\u4e2d\u6709\u4e2a\u5916\u952e\u4e3a\u7ea7\u522b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u65f6\uff0c\u5220\u9664\u7ea7\u522b\uff0c\u5176\u6709\u5173\u8054\u7684\u5ba2\u6237\u6570\u636e\uff0c\u5e94\u8be5\u5982\u4f55\u5904\u7406\u5462\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e09\u79cd\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1.\u4fee\u6539\u7ea7\u522b\u5220\u9664\u7684\u903b\u8f91\uff0c\u67e5\u8be2\u662f\u5426\u6709\u5173\u8054\u7684\u6570\u636e\uff0c\u6709\u5173\u8054\u6570\u636e\uff0c\u4e0d\u5141\u8bb8\u5220\u9664<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2.\u5c06\u4e0e\u7ea7\u522b\u76f8\u5173\u8054\u7684\u5ba2\u6237\u8bbe\u7f6e\u4e3a\u9ed8\u8ba4\u503c\uff0c\u4f8b\u5982NULL<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3.\u4e0d\u505a\u4efb\u4f55\u884c\u4e3a\uff0c\u540e\u7eed\u5ba2\u6237\u67e5\u8be2\u5c31\u9700\u8981\u7c7b\u4f3c\u4e8e\u5982\u4e0b\u67e5\u8be2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">queryset = models.Customer.objects.filter(active=1\uff0clevel_active=1)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\uff1a\u5982\u679c\u67d0\u4e2amodelform\u6d89\u53ca\u7684\u4e0b\u62c9\u662f\u4e2a\u5916\u952e\uff0c\u4e14\u8fd9\u4e2a\u5916\u952e\u4e5f\u4f7f\u7528\u4e86\u903b\u8f91\u5220\u9664\uff0c\u9700\u8981\u5728\u8fd9\u4e2amodelform\u5bf9\u5e94\u7684\u6a21\u578b\u4e2d\uff0c\u5728\u8fd9\u4e2a\u4f7f\u7528\u4e86\u903b\u8f91\u5220\u9664\u7684\u5916\u952e\u5b57\u6bb5\uff0c\u6dfb\u52a0limit_choices_to\u6765\u7b5b\u9009\u672a\u88ab\u903b\u8f91\u5220\u9664\u7684\u5173\u8054\u5b57\u6bb5\uff0c\u5426\u5219\uff0c\u903b\u8f91\u5220\u9664\u7684\u5b57\u6bb5\u503c\u4e5f\u4f1a\u663e\u793a\u5728\u4e0b\u62c9\u6846\u4e2d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>level = models.ForeignKey(verbose_name=\"\u7ea7\u522b\", to=\"Level\", on_delete=models.CASCADE,null=True,blank=True,limit_choices_to={'active':1})\n------------------------------------------<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e6\u4e00\u79cd\u505a\u6cd5\u662f\uff0c\u901a\u8fc7\u5728ModelForm\u4e2d\uff0c\u8fdb\u884c\u7c7b\u4f3c\u5982\u4e0b\u7684\u64cd\u4f5c\u6765\u89e3\u51b3\u6b64\u95ee\u9898<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def __init__(self,*args,**kwargs):\n    super().__init__(*args,**kwargs)\n    print(self.fields&#91;'level'].queryset)\n    self.fields&#91;'level'].queryset = models.Level.objects.filter(active=1)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6bd4\u5982\u6709\u4e24\u4e2a\u8868\uff0c\u5206\u522b\u662f\u7ea7\u522b\u8868\u548c\u5ba2\u6237\u8868\uff0c\u4e24\u4e2a\u8868\u7684\u5220\u9664\uff0c\u90fd\u662f\u903b\u8f91\u5220\u9664\u800c\u975e\u7269\u7406\u5220\u9664 \u5176\u4e2d\uff0c\u5ba2\u6237\u8868\u4e2d\u6709\u4e2a\u5916\u952e\u4e3a\u7ea7\u522b \u6b64\u65f6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1224","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/posts\/1224","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/comments?post=1224"}],"version-history":[{"count":4,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/posts\/1224\/revisions"}],"predecessor-version":[{"id":1244,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/posts\/1224\/revisions\/1244"}],"wp:attachment":[{"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/media?parent=1224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/categories?post=1224"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/tags?post=1224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}