{"id":179920,"date":"2024-11-09T05:54:19","date_gmt":"2024-11-08T21:54:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179920\/"},"modified":"2024-11-09T05:54:19","modified_gmt":"2024-11-08T21:54:19","slug":"%e5%a6%82%e4%bd%95%e6%8e%8c%e6%8f%a1-mysql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%8b%95%e6%85%8b%e8%a1%a8%e7%9a%84%e7%89%b9%e5%be%b5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179920\/","title":{"rendered":"\u5982\u4f55\u638c\u63e1 MySQL \u6578\u64da\u5eab\u4e2d\u52d5\u614b\u8868\u7684\u7279\u5fb5"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e6%8e%8c%e6%8f%a1-mysql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%8b%95%e6%85%8b%e8%a1%a8%e7%9a%84%e7%89%b9%e5%be%b5-gVqOPiZxIc\">\u5982\u4f55\u638c\u63e1 MySQL \u6578\u64da\u5eab\u4e2d\u52d5\u614b\u8868\u7684\u7279\u5fb5<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0cMySQL \u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u52d5\u614b\u8868\u662f MySQL \u4e2d\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u7406\u89e3\u5176\u7279\u5fb5\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u548c\u512a\u5316\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e MySQL \u4e2d\u52d5\u614b\u8868\u7684\u7279\u5fb5\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%8b%95%e6%85%8b%e8%a1%a8%ef%bc%9f-gVqOPiZxIc\">\u4ec0\u9ebc\u662f\u52d5\u614b\u8868\uff1f<\/h2>\n<p>\u52d5\u614b\u8868\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u8868\u7684\u7d50\u69cb\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u7684\u8868\u3002\u9019\u610f\u5473\u8457\u7528\u6236\u53ef\u4ee5\u5728\u4e0d\u5f71\u97ff\u73fe\u6709\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\uff0c\u96a8\u6642\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5217\u3002\u9019\u7a2e\u9748\u6d3b\u6027\u4f7f\u5f97\u52d5\u614b\u8868\u7279\u5225\u9069\u5408\u65bc\u9700\u8981\u983b\u7e41\u8b8a\u66f4\u6578\u64da\u7d50\u69cb\u7684\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e5%8b%95%e6%85%8b%e8%a1%a8%e7%9a%84%e7%89%b9%e5%be%b5-gVqOPiZxIc\">\u52d5\u614b\u8868\u7684\u7279\u5fb5<\/h2>\n<h3 id=\"1-%e7%b5%90%e6%a7%8b%e9%9d%88%e6%b4%bb%e6%80%a7-gVqOPiZxIc\">1. \u7d50\u69cb\u9748\u6d3b\u6027<\/h3>\n<p>\u52d5\u614b\u8868\u7684\u6700\u5927\u7279\u5fb5\u662f\u5176\u7d50\u69cb\u7684\u9748\u6d3b\u6027\u3002\u7528\u6236\u53ef\u4ee5\u6839\u64da\u696d\u52d9\u9700\u6c42\u96a8\u6642\u8abf\u6574\u8868\u7684\u7d50\u69cb\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 <code>ALTER TABLE<\/code> \u8a9e\u53e5\u53ef\u4ee5\u8f15\u9b06\u6dfb\u52a0\u65b0\u5217\uff1a<\/p>\n<pre><code>ALTER TABLE your_table ADD COLUMN new_column VARCHAR(255);<\/code><\/pre>\n<h3 id=\"2-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e7%9a%84%e5%a4%9a%e6%a8%a3%e6%80%a7-gVqOPiZxIc\">2. \u6578\u64da\u985e\u578b\u7684\u591a\u6a23\u6027<\/h3>\n<p>\u52d5\u614b\u8868\u652f\u6301\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5305\u62ec\u6574\u6578\u3001\u6d6e\u9ede\u6578\u3001\u5b57\u7b26\u4e32\u7b49\u3002\u9019\u4f7f\u5f97\u7528\u6236\u53ef\u4ee5\u6839\u64da\u4e0d\u540c\u7684\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u9700\u8981\u5b58\u5132\u6587\u672c\u7684\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>TEXT<\/code> \u6216 <code>VARCHAR<\/code> \u985e\u578b\uff0c\u800c\u5c0d\u65bc\u6578\u5b57\u5247\u53ef\u4ee5\u4f7f\u7528 <code>INT<\/code> \u6216 <code>FLOAT<\/code>\u3002<\/p>\n<h3 id=\"3-%e6%94%af%e6%8c%81-null-%e5%80%bc-gVqOPiZxIc\">3. \u652f\u6301 NULL \u503c<\/h3>\n<p>\u5728\u52d5\u614b\u8868\u4e2d\uff0c\u5217\u53ef\u4ee5\u8a2d\u7f6e\u70ba\u5141\u8a31 NULL \u503c\uff0c\u9019\u610f\u5473\u8457\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u53ef\u4ee5\u662f\u7f3a\u5931\u7684\u3002\u9019\u5c0d\u65bc\u9700\u8981\u9748\u6d3b\u8655\u7406\u4e0d\u5b8c\u6574\u6578\u64da\u7684\u61c9\u7528\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5275\u5efa\u4e00\u500b\u5141\u8a31 NULL \u503c\u7684\u5217\uff1a<\/p>\n<pre><code>ALTER TABLE your_table ADD COLUMN optional_column INT NULL;<\/code><\/pre>\n<h3 id=\"4-%e6%95%b8%e6%93%9a%e5%ae%8c%e6%95%b4%e6%80%a7%e7%b4%84%e6%9d%9f-gVqOPiZxIc\">4. \u6578\u64da\u5b8c\u6574\u6027\u7d04\u675f<\/h3>\n<p>\u5118\u7ba1\u52d5\u614b\u8868\u5177\u6709\u9748\u6d3b\u6027\uff0c\u4f46\u4ecd\u7136\u53ef\u4ee5\u8a2d\u7f6e\u6578\u64da\u5b8c\u6574\u6027\u7d04\u675f\uff0c\u4f8b\u5982\u4e3b\u9375\u3001\u5916\u9375\u548c\u552f\u4e00\u7d04\u675f\u3002\u9019\u4e9b\u7d04\u675f\u6709\u52a9\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u4f8b\u5982\uff0c\u8a2d\u7f6e\u4e3b\u9375\uff1a<\/p>\n<pre><code>ALTER TABLE your_table ADD PRIMARY KEY (id);<\/code><\/pre>\n<h3 id=\"5-%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-gVqOPiZxIc\">5. \u6027\u80fd\u8003\u91cf<\/h3>\n<p>\u52d5\u614b\u8868\u7684\u9748\u6d3b\u6027\u96d6\u7136\u5e36\u4f86\u4e86\u4fbf\u5229\uff0c\u4f46\u5728\u6027\u80fd\u65b9\u9762\u4e5f\u9700\u8981\u8b39\u614e\u8003\u91cf\u3002\u983b\u7e41\u7684\u7d50\u69cb\u8b8a\u66f4\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u56e0\u6b64\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u5408\u7406\u898f\u5283\u8868\u7684\u7d50\u69cb\u3002<\/p>\n<h2 id=\"%e5%8b%95%e6%85%8b%e8%a1%a8%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-gVqOPiZxIc\">\u52d5\u614b\u8868\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u52d5\u614b\u8868\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u80fd\u767c\u63ee\u5176\u512a\u52e2\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u5bb9\u7ba1\u7406\u7cfb\u7d71\uff1a<\/strong>\u9700\u8981\u6839\u64da\u7528\u6236\u9700\u6c42\u4e0d\u65b7\u6dfb\u52a0\u65b0\u5167\u5bb9\u985e\u578b\u3002<\/li>\n<li><strong>\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\uff1a<\/strong>\u96a8\u8457\u7522\u54c1\u985e\u578b\u7684\u589e\u52a0\uff0c\u53ef\u80fd\u9700\u8981\u4e0d\u65b7\u8abf\u6574\u7522\u54c1\u5c6c\u6027\u3002<\/li>\n<li><strong>\u793e\u4ea4\u5a92\u9ad4\u61c9\u7528\uff1a<\/strong>\u7528\u6236\u53ef\u80fd\u6703\u5275\u5efa\u591a\u7a2e\u4e0d\u540c\u985e\u578b\u7684\u5167\u5bb9\uff0c\u9019\u9700\u8981\u9748\u6d3b\u7684\u6578\u64da\u7d50\u69cb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gVqOPiZxIc\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1 MySQL \u6578\u64da\u5eab\u4e2d\u52d5\u614b\u8868\u7684\u7279\u5fb5\u5c0d\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\u3002\u52d5\u614b\u8868\u7684\u9748\u6d3b\u6027\u3001\u6578\u64da\u985e\u578b\u7684\u591a\u6a23\u6027\u3001\u652f\u6301 NULL \u503c\u4ee5\u53ca\u6578\u64da\u5b8c\u6574\u6027\u7d04\u675f\u7b49\u7279\u5fb5\uff0c\u4f7f\u5176\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u4e86\u89e3\u9019\u4e9b\u7279\u5fb5\u5f8c\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u8a2d\u8a08\u548c\u512a\u5316\u6578\u64da\u5eab\u7d50\u69cb\uff0c\u4ee5\u6eff\u8db3\u4e0d\u65b7\u8b8a\u5316\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u904b\u884c\u60a8\u7684 MySQL \u6578\u64da\u5eab\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u638c\u63e1 MySQL \u6578\u64da\u5eab\u4e2d\u52d5\u614b\u8868\u7684\u7279\u5fb5\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff0c\u5be6\u73fe\u9748\u6d3b\u6578\u64da\u8655\u7406\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-179920","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179920","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=179920"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179920\/revisions"}],"predecessor-version":[{"id":179921,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179920\/revisions\/179921"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}