{"id":160283,"date":"2024-11-03T21:48:24","date_gmt":"2024-11-03T13:48:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160283\/"},"modified":"2024-11-03T21:48:25","modified_gmt":"2024-11-03T13:48:25","slug":"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-varchar2-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160283\/","title":{"rendered":"OceanBase \u6559\u7a0b\uff1aOceanBase VARCHAR2 \u6578\u64da\u985e\u578b"},"content":{"rendered":"<h1 id=\"oceanbase-%e6%95%99%e7%a8%8b%ef%bc%9aoceanbase-varchar2-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-xKorocLBMH\">OceanBase \u6559\u7a0b\uff1aOceanBase VARCHAR2 \u6578\u64da\u985e\u578b<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOceanBase \u4f5c\u70ba\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u5206\u4f48\u5f0f\u6578\u64da\u5eab\uff0c\u8d8a\u4f86\u8d8a\u53d7\u5230\u958b\u767c\u8005\u7684\u9752\u775e\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u898f\u6a21\u6578\u64da\u6642\uff0cOceanBase \u7684\u512a\u52e2\u986f\u800c\u6613\u898b\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e OceanBase \u4e2d\u7684 VARCHAR2 \u6578\u64da\u985e\u578b\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u7279\u6027\u53ca\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-varchar2-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%ef%bc%9f-xKorocLBMH\">\u4ec0\u9ebc\u662f VARCHAR2 \u6578\u64da\u985e\u578b\uff1f<\/h2>\n<p>VARCHAR2 \u662f\u4e00\u7a2e\u53ef\u8b8a\u9577\u5ea6\u7684\u5b57\u7b26\u6578\u64da\u985e\u578b\uff0c\u4e3b\u8981\u7528\u65bc\u5b58\u5132\u5b57\u7b26\u4e32\u6578\u64da\u3002\u8207\u56fa\u5b9a\u9577\u5ea6\u7684 CHAR \u6578\u64da\u985e\u578b\u76f8\u6bd4\uff0cVARCHAR2 \u66f4\u52a0\u9748\u6d3b\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u6839\u64da\u5be6\u969b\u5b58\u5132\u7684\u5b57\u7b26\u6578\u91cf\u4f86\u52d5\u614b\u5206\u914d\u7a7a\u9593\u3002\u9019\u4f7f\u5f97 VARCHAR2 \u5728\u8655\u7406\u8b8a\u9577\u5b57\u7b26\u4e32\u6642\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<h2 id=\"oceanbase-%e4%b8%ad%e7%9a%84-varchar2-%e7%89%b9%e6%80%a7-xKorocLBMH\">OceanBase \u4e2d\u7684 VARCHAR2 \u7279\u6027<\/h2>\n<ul>\n<li><strong>\u53ef\u8b8a\u9577\u5ea6\uff1a<\/strong>VARCHAR2 \u53ef\u4ee5\u5b58\u5132\u5f9e 0 \u5230\u6307\u5b9a\u6700\u5927\u9577\u5ea6\u7684\u5b57\u7b26\uff0c\u9019\u4f7f\u5f97\u5b83\u5728\u5b58\u5132\u4e0d\u5b9a\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\u6642\u975e\u5e38\u6709\u7528\u3002<\/li>\n<li><strong>\u5b57\u7b26\u96c6\u652f\u6301\uff1a<\/strong>OceanBase \u652f\u6301\u591a\u7a2e\u5b57\u7b26\u96c6\uff0cVARCHAR2 \u53ef\u4ee5\u6839\u64da\u9700\u8981\u9078\u64c7\u5408\u9069\u7684\u5b57\u7b26\u96c6\u4f86\u5b58\u5132\u6578\u64da\u3002<\/li>\n<li><strong>\u6700\u5927\u9577\u5ea6\uff1a<\/strong>\u5728 OceanBase \u4e2d\uff0cVARCHAR2 \u7684\u6700\u5927\u9577\u5ea6\u53ef\u4ee5\u8a2d\u7f6e\u70ba 4000 \u5b57\u7b26\uff0c\u9019\u5c0d\u65bc\u5927\u591a\u6578\u61c9\u7528\u5834\u666f\u4f86\u8aaa\u5df2\u7d93\u8db3\u5920\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-varchar2-%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-xKorocLBMH\">\u5982\u4f55\u4f7f\u7528 VARCHAR2 \u6578\u64da\u985e\u578b<\/h2>\n<p>\u5728 OceanBase \u4e2d\u5275\u5efa\u8868\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 VARCHAR2 \u6578\u64da\u985e\u578b\u4f86\u5b9a\u7fa9\u5217\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5275\u5efa\u4e00\u500b\u5305\u542b VARCHAR2 \u5217\u7684\u8868\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT PRIMARY KEY,\n    username VARCHAR2(50),\n    email VARCHAR2(100)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>users<\/code> \u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e09\u500b\u5217\uff1a<code>id<\/code>\u3001<code>username<\/code> \u548c <code>email<\/code>\u3002\u5176\u4e2d\uff0c<code>username<\/code> \u5217\u4f7f\u7528\u4e86 VARCHAR2 \u6578\u64da\u985e\u578b\uff0c\u6700\u5927\u9577\u5ea6\u70ba 50 \u5b57\u7b26\uff0c\u800c <code>email<\/code> \u5217\u7684\u6700\u5927\u9577\u5ea6\u70ba 100 \u5b57\u7b26\u3002<\/p>\n<h2 id=\"%e6%8f%92%e5%85%a5%e5%92%8c%e6%9f%a5%e8%a9%a2-varchar2-%e6%95%b8%e6%93%9a-xKorocLBMH\">\u63d2\u5165\u548c\u67e5\u8a62 VARCHAR2 \u6578\u64da<\/h2>\n<p>\u5728\u63d2\u5165\u6578\u64da\u6642\uff0c\u53ef\u4ee5\u76f4\u63a5\u5c07\u5b57\u7b26\u4e32\u503c\u63d2\u5165\u5230 VARCHAR2 \u5217\u4e2d\u3002\u4ee5\u4e0b\u662f\u63d2\u5165\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>INSERT INTO users (id, username, email) VALUES (1, 'john_doe', 'john@example.com');<\/code><\/pre>\n<p>\u67e5\u8a62\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u6a19\u6e96\u7684 SQL \u8a9e\u53e5\u4f86\u6aa2\u7d22 VARCHAR2 \u5217\u7684\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT username, email FROM users WHERE id = 1;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-xKorocLBMH\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 VARCHAR2 \u6578\u64da\u985e\u578b\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5118\u91cf\u907f\u514d\u4f7f\u7528\u904e\u9577\u7684\u5b57\u7b26\u4e32\uff0c\u4ee5\u514d\u6d6a\u8cbb\u5b58\u5132\u7a7a\u9593\u3002<\/li>\n<li>\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u5408\u7406\u898f\u5283 VARCHAR2 \u5217\u7684\u6700\u5927\u9577\u5ea6\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li>\u6ce8\u610f\u5b57\u7b26\u96c6\u7684\u9078\u64c7\uff0c\u78ba\u4fdd\u80fd\u5920\u6b63\u78ba\u5b58\u5132\u548c\u6aa2\u7d22\u6240\u9700\u7684\u5b57\u7b26\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-xKorocLBMH\">\u7e3d\u7d50<\/h2>\n<p>OceanBase \u7684 VARCHAR2 \u6578\u64da\u985e\u578b\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u9748\u6d3b\u4e14\u9ad8\u6548\u7684\u5b57\u7b26\u4e32\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528 VARCHAR2\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\u7372\u5f97\u66f4\u597d\u7684\u6027\u80fd\u548c\u53ef\u64f4\u5c55\u6027\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684 OceanBase \u6578\u64da\u5eab\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u670d\u52d9\u3002\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 OceanBase \u6559\u7a0b\uff0c\u6df1\u5165\u4e86\u89e3 VARCHAR2 \u6578\u64da\u985e\u578b\u7684\u7279\u6027\u3001\u7528\u6cd5\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6280\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-160283","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160283","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=160283"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160283\/revisions"}],"predecessor-version":[{"id":160284,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160283\/revisions\/160284"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160283"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160283"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160283"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}