{"id":153713,"date":"2024-11-02T09:44:17","date_gmt":"2024-11-02T01:44:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/153713\/"},"modified":"2024-11-02T09:44:18","modified_gmt":"2024-11-02T01:44:18","slug":"%e5%b8%b6%e6%82%a8%e4%ba%86%e8%a7%a3db2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%addb2%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/153713\/","title":{"rendered":"\u5e36\u60a8\u4e86\u89e3DB2\u6578\u64da\u5eab\u4e2dDB2\u5b57\u7b26\u4e32"},"content":{"rendered":"<h1 id=\"%e5%b8%b6%e6%82%a8%e4%ba%86%e8%a7%a3db2%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%addb2%e5%ad%97%e7%ac%a6%e4%b8%b2-WqzjSPptdf\">\u5e36\u60a8\u4e86\u89e3DB2\u6578\u64da\u5eab\u4e2dDB2\u5b57\u7b26\u4e32<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002IBM\u7684DB2\u6578\u64da\u5eab\u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u95dc\u4fc2\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u4f01\u696d\u7d1a\u61c9\u7528\u4e2d\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eDB2\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u4e32\u8655\u7406\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u5176\u7279\u6027\u548c\u7528\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afdb2%e5%ad%97%e7%ac%a6%e4%b8%b2%ef%bc%9f-WqzjSPptdf\">\u4ec0\u9ebc\u662fDB2\u5b57\u7b26\u4e32\uff1f<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u5b57\u7b26\u4e32\u662f\u4e00\u7a2e\u6578\u64da\u985e\u578b\uff0c\u7528\u65bc\u5b58\u5132\u6587\u672c\u6578\u64da\u3002\u5b57\u7b26\u4e32\u53ef\u4ee5\u662f\u56fa\u5b9a\u9577\u5ea6\u6216\u53ef\u8b8a\u9577\u5ea6\uff0c\u4e26\u4e14\u53ef\u4ee5\u5305\u542b\u5b57\u6bcd\u3001\u6578\u5b57\u548c\u7279\u6b8a\u5b57\u7b26\u3002DB2\u652f\u6301\u591a\u7a2e\u5b57\u7b26\u4e32\u985e\u578b\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>CHAR(n)<\/strong>\uff1a\u56fa\u5b9a\u9577\u5ea6\u5b57\u7b26\u4e32\uff0c\u9577\u5ea6\u70ban\u500b\u5b57\u7b26\u3002\u5982\u679c\u5be6\u969b\u5b57\u7b26\u4e32\u9577\u5ea6\u5c0f\u65bcn\uff0c\u5247\u6703\u7528\u7a7a\u683c\u586b\u5145\u3002<\/li>\n<li><strong>VARCHAR(n)<\/strong>\uff1a\u53ef\u8b8a\u9577\u5ea6\u5b57\u7b26\u4e32\uff0c\u9577\u5ea6\u6700\u591a\u70ban\u500b\u5b57\u7b26\u3002\u9019\u7a2e\u5b57\u7b26\u4e32\u4e0d\u6703\u586b\u5145\u7a7a\u683c\uff0c\u50c5\u4f7f\u7528\u5be6\u969b\u5b57\u7b26\u6578\u3002<\/li>\n<li><strong>CLOB<\/strong>\uff1a\u5b57\u7b26\u5927\u5c0d\u8c61\uff0c\u7528\u65bc\u5b58\u5132\u5927\u91cf\u6587\u672c\u6578\u64da\uff0c\u6700\u5927\u53ef\u90542GB\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%93%8d%e4%bd%9c-WqzjSPptdf\">\u5b57\u7b26\u4e32\u7684\u57fa\u672c\u64cd\u4f5c<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c\u5305\u62ec\u5275\u5efa\u3001\u67e5\u8a62\u3001\u66f4\u65b0\u548c\u522a\u9664\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u5b57\u7b26\u4e32\u64cd\u4f5c\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e5%89%b5%e5%bb%ba%e5%ad%97%e7%ac%a6%e4%b8%b2-WqzjSPptdf\">\u5275\u5efa\u5b57\u7b26\u4e32<\/h3>\n<pre><code>CREATE TABLE example_table (\n    id INT,\n    name VARCHAR(100)\n);<\/code><\/pre>\n<p>\u4e0a\u8ff0\u4ee3\u78bc\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70baexample_table\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b\u6574\u6578\u985e\u578b\u7684id\u5217\u548c\u4e00\u500b\u53ef\u8b8a\u9577\u5ea6\u7684name\u5217\u3002<\/p>\n<h3 id=\"%e6%9f%a5%e8%a9%a2%e5%ad%97%e7%ac%a6%e4%b8%b2-WqzjSPptdf\">\u67e5\u8a62\u5b57\u7b26\u4e32<\/h3>\n<p>\u8981\u67e5\u8a62\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528SELECT\u8a9e\u53e5\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u6240\u6709\u540d\u5b57\u4ee5\u201cJohn\u201d\u958b\u982d\u7684\u8a18\u9304\uff1a<\/p>\n<pre><code>SELECT * FROM example_table\nWHERE name LIKE 'John%';<\/code><\/pre>\n<h3 id=\"%e6%9b%b4%e6%96%b0%e5%ad%97%e7%ac%a6%e4%b8%b2-WqzjSPptdf\">\u66f4\u65b0\u5b57\u7b26\u4e32<\/h3>\n<p>\u66f4\u65b0\u5b57\u7b26\u4e32\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>UPDATE example_table\nSET name = 'Jane Doe'\nWHERE id = 1;<\/code><\/pre>\n<h3 id=\"%e5%88%aa%e9%99%a4%e5%ad%97%e7%ac%a6%e4%b8%b2-WqzjSPptdf\">\u522a\u9664\u5b57\u7b26\u4e32<\/h3>\n<p>\u522a\u9664\u7279\u5b9a\u8a18\u9304\u7684\u8a9e\u6cd5\u70ba\uff1a<\/p>\n<pre><code>DELETE FROM example_table\nWHERE id = 1;<\/code><\/pre>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8-WqzjSPptdf\">\u5b57\u7b26\u4e32\u51fd\u6578<\/h2>\n<p>DB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u5167\u7f6e\u51fd\u6578\u4f86\u8655\u7406\u5b57\u7b26\u4e32\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u5b57\u7b26\u4e32\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><strong>LENGTH<\/strong>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u3002<\/li>\n<li><strong>UPPER<\/strong>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5927\u5beb\u3002<\/li>\n<li><strong>LOWER<\/strong>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5c0f\u5beb\u3002<\/li>\n<li><strong>SUBSTR<\/strong>\uff1a\u63d0\u53d6\u5b57\u7b26\u4e32\u7684\u5b50\u4e32\u3002<\/li>\n<\/ul>\n<h3 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8%e7%a4%ba%e4%be%8b-WqzjSPptdf\">\u5b57\u7b26\u4e32\u51fd\u6578\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4f7f\u7528\u5b57\u7b26\u4e32\u51fd\u6578\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT LENGTH(name) AS name_length,\n       UPPER(name) AS upper_name\nFROM example_table;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-WqzjSPptdf\">\u7d50\u8ad6<\/h2>\n<p>DB2\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u4e32\u8655\u7406\u662f\u6578\u64da\u7ba1\u7406\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002\u901a\u904e\u7406\u89e3\u5b57\u7b26\u4e32\u7684\u985e\u578b\u3001\u57fa\u672c\u64cd\u4f5c\u548c\u5167\u7f6e\u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728\u958b\u767c\u61c9\u7528\u7a0b\u5e8f\u9084\u662f\u9032\u884c\u6578\u64da\u5206\u6790\uff0c\u638c\u63e1\u9019\u4e9b\u77e5\u8b58\u90fd\u5c07\u5c0d\u60a8\u5927\u6709\u88e8\u76ca\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u90e8\u7f72\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u4eab\u53d7\u9ad8\u6548\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22DB2\u6578\u64da\u5eab\u4e2d\u7684DB2\u5b57\u7b26\u4e32\uff0c\u4e86\u89e3\u5176\u7279\u6027\u3001\u7528\u6cd5\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-153713","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153713","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=153713"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153713\/revisions"}],"predecessor-version":[{"id":153714,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153713\/revisions\/153714"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=153713"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=153713"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=153713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}