{"id":173827,"date":"2024-11-07T20:16:20","date_gmt":"2024-11-07T12:16:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173827\/"},"modified":"2024-11-07T20:16:21","modified_gmt":"2024-11-07T12:16:21","slug":"%e5%a6%82%e4%bd%95%e8%a7%a3%e6%b1%baexcess%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e8%a1%8c%e9%81%8e%e9%95%b7%e9%9c%80%e8%a6%81%e9%80%b2%e8%a1%8c%e8%a1%8c%e6%8b%86%e5%88%86%e7%9a%84%e5%95%8f%e9%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173827\/","title":{"rendered":"\u5982\u4f55\u89e3\u6c7aexcess\u6578\u64da\u5eab\u7684\u884c\u904e\u9577\u9700\u8981\u9032\u884c\u884c\u62c6\u5206\u7684\u554f\u984c\uff1f (excess\u6578\u64da\u5eab \u884c\u62c6\u5206)"},"content":{"rendered":"

\u5982\u4f55\u89e3\u6c7aexcess\u6578\u64da\u5eab\u7684\u884c\u904e\u9577\u9700\u8981\u9032\u884c\u884c\u62c6\u5206\u7684\u554f\u984c\uff1f<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u884c\u904e\u9577\u7684\u554f\u984c\u5e38\u5e38\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u548c\u6578\u64da\u8655\u7406\u7684\u56f0\u96e3\u3002\u7279\u5225\u662f\u5728\u4f7f\u7528excess\u6578\u64da\u5eab\u6642\uff0c\u884c\u7684\u9577\u5ea6\u9650\u5236\u53ef\u80fd\u6703\u5f71\u97ff\u5230\u6578\u64da\u7684\u5b58\u5132\u548c\u6aa2\u7d22\u6548\u7387\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u89e3\u6c7aexcess\u6578\u64da\u5eab\u4e2d\u884c\u904e\u9577\u7684\u554f\u984c\uff0c\u4e26\u4ecb\u7d39\u884c\u62c6\u5206\u7684\u6280\u8853\u53ca\u5176\u5be6\u65bd\u6b65\u9a5f\u3002<\/p>\n

\u884c\u904e\u9577\u7684\u554f\u984c<\/h2>\n

\u884c\u904e\u9577\u7684\u554f\u984c\u901a\u5e38\u662f\u7531\u65bc\u6578\u64da\u5eab\u4e2d\u67d0\u4e9b\u884c\u7684\u6578\u64da\u91cf\u8d85\u904e\u4e86\u9810\u8a2d\u7684\u9650\u5236\u3002\u9019\u53ef\u80fd\u662f\u56e0\u70ba\u5b58\u5132\u4e86\u904e\u591a\u7684\u6587\u672c\u3001\u5716\u50cf\u6216\u5176\u4ed6\u985e\u578b\u7684\u6578\u64da\u3002\u7576\u884c\u7684\u9577\u5ea6\u8d85\u904e\u6578\u64da\u5eab\u7684\u9650\u5236\u6642\uff0c\u5c07\u7121\u6cd5\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\uff0c\u9019\u6703\u5c0e\u81f4\u61c9\u7528\u7a0b\u5e8f\u51fa\u73fe\u932f\u8aa4\uff0c\u4e26\u5f71\u97ff\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n

\u884c\u62c6\u5206\u7684\u6982\u5ff5<\/h2>\n

\u884c\u62c6\u5206\u662f\u6307\u5c07\u4e00\u884c\u6578\u64da\u5206\u5272\u6210\u591a\u500b\u8f03\u5c0f\u7684\u884c\uff0c\u4ee5\u4fbf\u65bc\u5b58\u5132\u548c\u7ba1\u7406\u3002\u9019\u7a2e\u6280\u8853\u4e0d\u50c5\u53ef\u4ee5\u89e3\u6c7a\u884c\u904e\u9577\u7684\u554f\u984c\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u6aa2\u7d22\u6548\u7387\u3002\u884c\u62c6\u5206\u7684\u57fa\u672c\u601d\u8def\u662f\u5c07\u4e00\u884c\u4e2d\u7684\u67d0\u4e9b\u5b57\u6bb5\u6216\u6578\u64da\u79fb\u52d5\u5230\u53e6\u4e00\u500b\u8868\u4e2d\uff0c\u4e26\u901a\u904e\u5916\u9375\u95dc\u806f\u4f86\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n

\u884c\u62c6\u5206\u7684\u5be6\u65bd\u6b65\u9a5f<\/h2>\n

1. \u5206\u6790\u6578\u64da\u7d50\u69cb<\/h3>\n

\u5728\u9032\u884c\u884c\u62c6\u5206\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u5206\u6790\u73fe\u6709\u7684\u6578\u64da\u7d50\u69cb\u3002\u78ba\u5b9a\u54ea\u4e9b\u5b57\u6bb5\u7684\u6578\u64da\u91cf\u904e\u5927\uff0c\u4e26\u8003\u616e\u5c07\u5176\u62c6\u5206\u5230\u65b0\u7684\u8868\u4e2d\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u500b\u7528\u6236\u8868\u4e2d\u5305\u542b\u5927\u91cf\u7684\u7528\u6236\u63cf\u8ff0\u4fe1\u606f\uff0c\u53ef\u4ee5\u8003\u616e\u5c07\u9019\u4e9b\u63cf\u8ff0\u4fe1\u606f\u79fb\u5230\u4e00\u500b\u55ae\u7368\u7684\u8868\u4e2d\u3002<\/p>\n

2. \u8a2d\u8a08\u65b0\u8868\u7d50\u69cb<\/h3>\n

\u6839\u64da\u5206\u6790\u7d50\u679c\uff0c\u8a2d\u8a08\u65b0\u7684\u8868\u7d50\u69cb\u3002\u65b0\u8868\u61c9\u8a72\u5305\u542b\u9700\u8981\u62c6\u5206\u7684\u5b57\u6bb5\uff0c\u4e26\u8a2d\u7f6e\u5916\u9375\u4ee5\u4fbf\u65bc\u8207\u539f\u59cb\u8868\u9032\u884c\u95dc\u806f\u3002\u4f8b\u5982\uff1a<\/p>\n

CREATE TABLE UserDescriptions (\n    UserID INT,\n    Description TEXT,\n    PRIMARY KEY (UserID),\n    FOREIGN KEY (UserID) REFERENCES Users(UserID)\n);<\/code><\/pre>\n
3. \u6578\u64da\u9077\u79fb<\/h3>\n
\u5728\u65b0\u8868\u7d50\u69cb\u8a2d\u8a08\u5b8c\u6210\u5f8c\uff0c\u63a5\u4e0b\u4f86\u9700\u8981\u5c07\u6578\u64da\u5f9e\u539f\u59cb\u8868\u4e2d\u9077\u79fb\u5230\u65b0\u8868\u4e2d\u3002\u9019\u53ef\u4ee5\u901a\u904eSQL\u8a9e\u53e5\u4f86\u5be6\u73fe\uff0c\u4f8b\u5982\uff1a<\/p>\n
INSERT INTO UserDescriptions (UserID, Description)\nSELECT UserID, Description FROM Users WHERE LENGTH(Description) > 255;<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u6240\u6709\u63cf\u8ff0\u9577\u5ea6\u8d85\u904e255\u500b\u5b57\u7b26\u7684\u7528\u6236\u63cf\u8ff0\u9077\u79fb\u5230\u65b0\u8868\u4e2d\u3002<\/p>\n
4. \u66f4\u65b0\u539f\u59cb\u8868<\/h3>\n
\u6578\u64da\u9077\u79fb\u5b8c\u6210\u5f8c\uff0c\u9700\u8981\u66f4\u65b0\u539f\u59cb\u8868\u4ee5\u522a\u9664\u5df2\u7d93\u9077\u79fb\u7684\u6578\u64da\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u5be6\u73fe\uff1a<\/p>\n
UPDATE Users SET Description = NULL WHERE LENGTH(Description) > 255;<\/code><\/pre>\n
5. \u6e2c\u8a66\u548c\u9a57\u8b49<\/h3>\n
\u6700\u5f8c\uff0c\u9032\u884c\u6e2c\u8a66\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u6aa2\u67e5\u65b0\u8868\u4e2d\u7684\u6578\u64da\u662f\u5426\u6b63\u78ba\uff0c\u4e26\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u80fd\u5920\u6b63\u5e38\u8a2a\u554f\u548c\u4f7f\u7528\u9019\u4e9b\u6578\u64da\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u884c\u904e\u9577\u7684\u554f\u984c\u5728excess\u6578\u64da\u5eab\u4e2d\u662f\u5e38\u898b\u7684\uff0c\u4f46\u901a\u904e\u884c\u62c6\u5206\u6280\u8853\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u4e00\u554f\u984c\u3002\u901a\u904e\u5206\u6790\u6578\u64da\u7d50\u69cb\u3001\u8a2d\u8a08\u65b0\u8868\u3001\u9077\u79fb\u6578\u64da\u3001\u66f4\u65b0\u539f\u59cb\u8868\u4ee5\u53ca\u9032\u884c\u6e2c\u8a66\uff0c\u60a8\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5b58\u5132\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u904b\u884c\uff0c\u9078\u64c7\u5408\u9069\u7684\u4f3a\u670d\u5668<\/a>\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u89e3\u6c7aExcess\u6578\u64da\u5eab\u4e2d\u884c\u904e\u9577\u7684\u554f\u984c\uff0c\u901a\u904e\u884c\u62c6\u5206\u6280\u8853\u6709\u6548\u7ba1\u7406\u6578\u64da\uff0c\u63d0\u9ad8\u6027\u80fd\u548c\u53ef\u8b80\u6027\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-173827","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173827","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=173827"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173827\/revisions"}],"predecessor-version":[{"id":173828,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173827\/revisions\/173828"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173827"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173827"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}