{"id":174951,"date":"2024-11-08T01:08:17","date_gmt":"2024-11-07T17:08:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/174951\/"},"modified":"2024-11-08T01:08:18","modified_gmt":"2024-11-07T17:08:18","slug":"%e5%a6%82%e4%bd%95%e6%b8%85%e7%a9%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%9f%90%e5%80%8b%e5%ad%97%e6%ae%b5%e7%9a%84%e6%95%b8%e6%93%9a%e8%a1%a8%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%b8%85%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/174951\/","title":{"rendered":"\u5982\u4f55\u6e05\u7a7a\u6578\u64da\u5eab\u4e2d\u67d0\u500b\u5b57\u6bb5\u7684\u6578\u64da\u8868\uff1f (\u6578\u64da\u5eab\u6e05\u7a7a\u67d0\u500b\u5b57\u6bb5\u6578\u64da\u8868)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e6%b8%85%e7%a9%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e6%9f%90%e5%80%8b%e5%ad%97%e6%ae%b5%e7%9a%84%e6%95%b8%e6%93%9a%e8%a1%a8%ef%bc%9f-xXzYUhQFxa\">\u5982\u4f55\u6e05\u7a7a\u6578\u64da\u5eab\u4e2d\u67d0\u500b\u5b57\u6bb5\u7684\u6578\u64da\u8868\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6e05\u7a7a\u67d0\u500b\u5b57\u6bb5\u7684\u6578\u64da\u8868\u662f\u4e00\u500b\u5e38\u898b\u7684\u64cd\u4f5c\u3002\u9019\u901a\u5e38\u662f\u56e0\u70ba\u9700\u8981\u91cd\u7f6e\u67d0\u4e9b\u6578\u64da\uff0c\u6216\u8005\u5728\u9032\u884c\u6578\u64da\u6e05\u7406\u6642\u9700\u8981\u522a\u9664\u4e0d\u518d\u9700\u8981\u7684\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u6e05\u7a7a\u67d0\u500b\u5b57\u6bb5\u7684\u6578\u64da\u8868\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a6%82%e8%bf%b0-xXzYUhQFxa\">\u6578\u64da\u5eab\u6982\u8ff0<\/h2>\n<p>\u6578\u64da\u5eab\u662f\u4e00\u7a2e\u6709\u7d44\u7e54\u7684\u6578\u64da\u96c6\u5408\uff0c\u901a\u5e38\u7528\u65bc\u5b58\u5132\u548c\u7ba1\u7406\u4fe1\u606f\u3002\u5e38\u898b\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u5305\u62ec MySQL\u3001PostgreSQL\u3001SQLite \u548c Microsoft SQL Server \u7b49\u3002\u6bcf\u7a2e\u6578\u64da\u5eab\u7cfb\u7d71\u90fd\u6709\u5176\u7279\u5b9a\u7684\u8a9e\u6cd5\u548c\u64cd\u4f5c\u65b9\u5f0f\uff0c\u4f46\u57fa\u672c\u7684\u6578\u64da\u64cd\u4f5c\u539f\u5247\u662f\u76f8\u4f3c\u7684\u3002<\/p>\n<h2 id=\"%e6%b8%85%e7%a9%ba%e5%ad%97%e6%ae%b5%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-xXzYUhQFxa\">\u6e05\u7a7a\u5b57\u6bb5\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u6e05\u7a7a\u67d0\u500b\u5b57\u6bb5\u7684\u6578\u64da\u8868\uff0c\u901a\u5e38\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528 SQL \u8a9e\u53e5\u66f4\u65b0\u5b57\u6bb5\u70ba NULL \u6216\u7a7a\u503c\u3002<\/li>\n<li>\u4f7f\u7528 DELETE \u8a9e\u53e5\u522a\u9664\u6574\u884c\u6578\u64da\u3002<\/li>\n<li>\u4f7f\u7528 TRUNCATE \u8a9e\u53e5\u6e05\u7a7a\u6574\u500b\u8868\uff08\u5982\u679c\u9700\u8981\u6e05\u7a7a\u6240\u6709\u5b57\u6bb5\uff09\u3002<\/li>\n<\/ul>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e6%9b%b4%e6%96%b0%e5%ad%97%e6%ae%b5%e7%82%ba-null-xXzYUhQFxa\">\u65b9\u6cd5\u4e00\uff1a\u66f4\u65b0\u5b57\u6bb5\u70ba NULL<\/h3>\n<p>\u5982\u679c\u60a8\u53ea\u60f3\u6e05\u7a7a\u67d0\u500b\u5b57\u6bb5\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 UPDATE \u8a9e\u53e5\u5c07\u8a72\u5b57\u6bb5\u7684\u503c\u8a2d\u7f6e\u70ba NULL \u6216\u7a7a\u5b57\u7b26\u4e32\u3002\u4ee5\u4e0b\u662f MySQL \u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>UPDATE \u8868\u540d SET \u5b57\u6bb5\u540d = NULL WHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u6709\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\uff0c\u4e26\u4e14\u60f3\u8981\u6e05\u7a7a <code>email<\/code> \u5b57\u6bb5\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>UPDATE users SET email = NULL WHERE email IS NOT NULL;<\/code><\/pre>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e5%88%aa%e9%99%a4%e6%95%b4%e8%a1%8c%e6%95%b8%e6%93%9a-xXzYUhQFxa\">\u65b9\u6cd5\u4e8c\uff1a\u522a\u9664\u6574\u884c\u6578\u64da<\/h3>\n<p>\u5982\u679c\u60a8\u5e0c\u671b\u522a\u9664\u6574\u884c\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 DELETE \u8a9e\u53e5\u3002\u9019\u5c07\u522a\u9664\u7b26\u5408\u689d\u4ef6\u7684\u6240\u6709\u884c\uff1a<\/p>\n<pre><code>DELETE FROM \u8868\u540d WHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u522a\u9664\u6240\u6709\u96fb\u5b50\u90f5\u4ef6\u70ba\u7a7a\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>DELETE FROM users WHERE email IS NULL;<\/code><\/pre>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%89%ef%bc%9a%e6%b8%85%e7%a9%ba%e6%95%b4%e5%80%8b%e8%a1%a8-xXzYUhQFxa\">\u65b9\u6cd5\u4e09\uff1a\u6e05\u7a7a\u6574\u500b\u8868<\/h3>\n<p>\u5982\u679c\u60a8\u9700\u8981\u6e05\u7a7a\u6574\u500b\u8868\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 TRUNCATE \u8a9e\u53e5\u3002\u9019\u5c07\u522a\u9664\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u4f46\u4e0d\u6703\u522a\u9664\u8868\u7d50\u69cb\uff1a<\/p>\n<pre><code>TRUNCATE TABLE \u8868\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u6e05\u7a7a <code>users<\/code> \u8868\u4e2d\u7684\u6240\u6709\u6578\u64da\uff1a<\/p>\n<pre><code>TRUNCATE TABLE users;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-xXzYUhQFxa\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u6e05\u7a7a\u64cd\u4f5c\u6642\uff0c\u8acb\u52d9\u5fc5\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u5728\u57f7\u884c\u4efb\u4f55\u522a\u9664\u6216\u66f4\u65b0\u64cd\u4f5c\u4e4b\u524d\uff0c\u5efa\u8b70\u5148\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u4e1f\u5931\u91cd\u8981\u4fe1\u606f\u3002<\/li>\n<li>\u78ba\u4fdd\u60a8\u6709\u8db3\u5920\u7684\u6b0a\u9650\u4f86\u57f7\u884c\u9019\u4e9b\u64cd\u4f5c\uff0c\u7279\u5225\u662f\u5728\u751f\u7522\u74b0\u5883\u4e2d\u3002<\/li>\n<li>\u5728\u4f7f\u7528 TRUNCATE \u8a9e\u53e5\u6642\uff0c\u8acb\u6ce8\u610f\u9019\u662f\u4e00\u500b\u4e0d\u53ef\u9006\u7684\u64cd\u4f5c\uff0c\u5c07\u7121\u6cd5\u6062\u5fa9\u88ab\u522a\u9664\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-xXzYUhQFxa\">\u7e3d\u7d50<\/h2>\n<p>\u6e05\u7a7a\u6578\u64da\u5eab\u4e2d\u67d0\u500b\u5b57\u6bb5\u7684\u6578\u64da\u8868\u662f\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u7ba1\u7406\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u4f7f\u7528 UPDATE\u3001DELETE \u9084\u662f TRUNCATE \u8a9e\u53e5\uff0c\u90fd\u9700\u8981\u8b39\u614e\u64cd\u4f5c\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u6e05\u7a7a\u6578\u64da\u5eab\u4e2d\u7279\u5b9a\u5b57\u6bb5\u7684\u6578\u64da\u8868\uff0c\u7c21\u55ae\u6b65\u9a5f\u6559\u4f60\u6709\u6548\u7ba1\u7406\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-174951","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174951","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=174951"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174951\/revisions"}],"predecessor-version":[{"id":174952,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174951\/revisions\/174952"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=174951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=174951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=174951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}