{"id":306,"date":"2014-03-28T16:41:13","date_gmt":"2014-03-28T08:41:13","guid":{"rendered":"http:\/\/blog.feizhaojun.com\/?p=306"},"modified":"2014-03-28T16:46:17","modified_gmt":"2014-03-28T08:46:17","slug":"php%e5%b0%86null%e5%ad%98%e5%85%a5mysql%e6%95%b0%e6%8d%ae%e5%ba%93","status":"publish","type":"post","link":"https:\/\/feizhaojun.com\/?p=306","title":{"rendered":"PHP\u5c06NULL\u5b58\u5165MySQL\u6570\u636e\u5e93"},"content":{"rendered":"<p>\u5982\u679cMySQL\u5b57\u6bb5\u8bbe\u7f6e\u4e86\u7279\u5b9a\u683c\u5f0f\uff08\u5982\u65e5\u671f\uff09\uff0c\u6211\u4eec\u5b58\u7a7a\u5b57\u7b26\u6216\u8005\u201c0\u201d\u6216\u8005\u7a7a\u683c\u90fd\u4e0d\u53ef\u884c\u7684\u65f6\u5019\uff0c\u5c31\u9700\u8981\u5b58\u5165NULL\u3002<\/p>\n<p>PHP\u5982\u4f55\u5c06NULL\u5b58\u5165MySQL\u6570\u636e\u5e93\u5462\uff1f<\/p>\n<p>\u5176\u5b9e\u53ea\u9700\u8981\u5728MySQL\u628a\u8be5\u5b57\u6bb5\u8bbe\u7f6e\u4e3a\u5141\u8bb8\u4e3a\u7a7a\uff0c\u5e76\u4e14\u9ed8\u8ba4\u503c\u662fNULL\uff0c\u7136\u540e\u5728\u5199\u6570\u636e\u5e93\u7684\u65f6\u5019\u4e0d\u4e3a\u8be5\u53d8\u91cf\u8d4b\u503c\u5c31\u884c\u4e86\u3002<\/p>\n<p>\u5982\u679c\u5199\u5165\u6570\u636e\u5e93\u7684\u53d8\u91cf\u5728\u4e00\u4e2a\u6570\u636e\u91cf\uff0c\u6211\u4eec\u5df2\u7ecf\u6279\u91cf\u8d4b\u503c\u4e86\u3002\u6bd4\u5982\uff1a<\/p>\n<p>\u6240\u6709\u8981\u5199\u5165\u6570\u636e\u5e93\u7684\u53d8\u91cf\u90fd\u5728\u6570\u7ec4$arr\u91cc\u9762\uff0c\u800c$arr['date']=\"\";<\/p>\n<p>\u6211\u4eec\u4fee\u6539$arr[\"date\"]=NULL\u6216\u8005$arr[\"date\"]=\"NULL\"\u90fd\u4e0d\u53ef\u884c\u3002<\/p>\n<p>\u90a3\u5c31\u76f4\u63a5\u628a$arr[\"date\"]\u8fd9\u4e2a\u5143\u7d20\u5220\u6389\u597d\u4e86\uff1a<\/p>\n<p>if(empty($arr['date'])){unset($arr['date']);}<\/p>\n<p>unset\u5220\u9664\u6570\u7ec4\u5143\u7d20\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u679cMySQL\u5b57\u6bb5\u8bbe\u7f6e\u4e86\u7279\u5b9a\u683c\u5f0f\uff08\u5982\u65e5\u671f\uff09\uff0c\u6211\u4eec\u5b58\u7a7a\u5b57\u7b26\u6216\u8005\u201c0\u201d\u6216\u8005\u7a7a\u683c\u90fd\u4e0d\u53ef\u884c\u7684\u65f6\u5019\uff0c\u5c31\u9700\u8981\u5b58\u5165NULL\u3002 PHP\u5982&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[29,6],"tags":[],"class_list":["post-306","post","type-post","status-publish","format-standard","hentry","category-29","category-php"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/306","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=306"}],"version-history":[{"count":2,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/306\/revisions"}],"predecessor-version":[{"id":308,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=\/wp\/v2\/posts\/306\/revisions\/308"}],"wp:attachment":[{"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=306"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=306"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feizhaojun.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=306"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}