{"id":60679,"date":"2024-10-13T04:54:17","date_gmt":"2024-10-12T20:54:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60679\/"},"modified":"2024-10-13T04:54:17","modified_gmt":"2024-10-12T20:54:17","slug":"db2%e6%95%b8%e6%93%9a%e5%ba%ab%e5%bf%85%e9%a0%88%e6%8e%8c%e6%8f%a1%e7%9a%84%e5%b8%b8%e7%94%a8%e8%aa%9e%e5%8f%a5%ef%bc%88%e4%ba%8c%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60679\/","title":{"rendered":"DB2\u6578\u64da\u5eab\u5fc5\u9808\u638c\u63e1\u7684\u5e38\u7528\u8a9e\u53e5\uff08\u4e8c\uff09"},"content":{"rendered":"

DB2\u6578\u64da\u5eab\u5fc5\u9808\u638c\u63e1\u7684\u5e38\u7528\u8a9e\u53e5\uff08\u4e8c\uff09<\/h1>\n

\u5728\u524d\u4e00\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5011\u4ecb\u7d39\u4e86DB2\u6578\u64da\u5eab\u7684\u4e00\u4e9b\u57fa\u672c\u8a9e\u53e5\uff0c\u9019\u4e9b\u8a9e\u53e5\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u64cd\u4f5c\u81f3\u95dc\u91cd\u8981\u3002\u5728\u9019\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5011\u5c07\u6df1\u5165\u63a2\u8a0e\u66f4\u591a\u7684DB2\u5e38\u7528\u8a9e\u53e5\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u638c\u63e1DB2\u7684\u4f7f\u7528\u6280\u5de7\u3002<\/p>\n

1. \u66f4\u65b0\u6578\u64da<\/h2>\n

\u5728DB2\u4e2d\uff0c\u66f4\u65b0\u6578\u64da\u7684\u8a9e\u53e5\u662f\u4f7f\u7528UPDATE<\/code>\u3002\u9019\u500b\u8a9e\u53e5\u53ef\u4ee5\u7528\u4f86\u4fee\u6539\u8868\u4e2d\u5df2\u5b58\u5728\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684\u66f4\u65b0\u8a9e\u53e5\u7bc4\u4f8b\uff1a<\/p>\n

UPDATE \u54e1\u5de5\nSET \u85aa\u6c34 = \u85aa\u6c34 * 1.1\nWHERE \u90e8\u9580 = '\u92b7\u552e';<\/code><\/pre>\n
\u9019\u500b\u8a9e\u53e5\u5c07\u6240\u6709\u5728\u201c\u92b7\u552e\u201d\u90e8\u9580\u7684\u54e1\u5de5\u85aa\u6c34\u63d0\u9ad810%\u3002\u5728\u4f7f\u7528UPDATE<\/code>\u8a9e\u53e5\u6642\uff0c\u52d9\u5fc5\u5c0f\u5fc3WHERE<\/code>\u689d\u4ef6\uff0c\u5426\u5247\u53ef\u80fd\u6703\u4e0d\u5c0f\u5fc3\u66f4\u65b0\u6574\u500b\u8868\u7684\u6578\u64da\u3002<\/p>\n
2. \u522a\u9664\u6578\u64da<\/h2>\n
\u522a\u9664\u6578\u64da\u7684\u8a9e\u53e5\u662fDELETE<\/code>\u3002\u9019\u500b\u8a9e\u53e5\u7528\u65bc\u5f9e\u8868\u4e2d\u522a\u9664\u4e00\u689d\u6216\u591a\u689d\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u6578\u64da\u7684\u7bc4\u4f8b\uff1a<\/p>\n
DELETE FROM \u54e1\u5de5\nWHERE \u54e1\u5de5ID = 12345;<\/code><\/pre>\n
\u9019\u500b\u8a9e\u53e5\u5c07\u522a\u9664\u54e1\u5de5ID\u70ba12345\u7684\u54e1\u5de5\u8a18\u9304\u3002\u8207UPDATE<\/code>\u8a9e\u53e5\u4e00\u6a23\uff0c\u4f7f\u7528DELETE<\/code>\u6642\u4e5f\u9700\u8981\u8b39\u614e\uff0c\u78ba\u4fddWHERE<\/code>\u689d\u4ef6\u6b63\u78ba\uff0c\u4ee5\u514d\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002<\/p>\n
3. \u67e5\u8a62\u6578\u64da<\/h2>\n
\u67e5\u8a62\u6578\u64da\u7684\u8a9e\u53e5\u662fSELECT<\/code>\u3002\u9019\u662fDB2\u4e2d\u6700\u5e38\u7528\u7684\u8a9e\u53e5\u4e4b\u4e00\uff0c\u7528\u65bc\u5f9e\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u8a62\u7684\u7bc4\u4f8b\uff1a<\/p>\n
SELECT \u59d3\u540d, \u85aa\u6c34\nFROM \u54e1\u5de5\nWHERE \u90e8\u9580 = '\u6280\u8853';<\/code><\/pre>\n
\u9019\u500b\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u5728\u201c\u6280\u8853\u201d\u90e8\u9580\u7684\u54e1\u5de5\u59d3\u540d\u548c\u85aa\u6c34\u3002SELECT<\/code>\u8a9e\u53e5\u9084\u53ef\u4ee5\u8207\u5176\u4ed6\u5b50\u53e5\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982ORDER BY<\/code>\u548cGROUP BY<\/code>\uff0c\u4ee5\u9032\u4e00\u6b65\u7be9\u9078\u548c\u6392\u5e8f\u6578\u64da\u3002<\/p>\n
4. \u5275\u5efa\u8868<\/h2>\n
\u5728DB2\u4e2d\uff0c\u5275\u5efa\u65b0\u8868\u7684\u8a9e\u53e5\u662fCREATE TABLE<\/code>\u3002\u9019\u500b\u8a9e\u53e5\u7528\u65bc\u5b9a\u7fa9\u65b0\u8868\u7684\u7d50\u69cb\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5275\u5efa\u8868\u7684\u7bc4\u4f8b\uff1a<\/p>\n
CREATE TABLE \u54e1\u5de5 (\n    \u54e1\u5de5ID INT PRIMARY KEY,\n    \u59d3\u540d VARCHAR(100),\n    \u85aa\u6c34 DECIMAL(10, 2),\n    \u90e8\u9580 VARCHAR(50)\n);<\/code><\/pre>\n
\u9019\u500b\u8a9e\u53e5\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba\u201c\u54e1\u5de5\u201d\u7684\u8868\uff0c\u4e26\u5b9a\u7fa9\u4e86\u56db\u500b\u5b57\u6bb5\uff1a\u54e1\u5de5ID\u3001\u59d3\u540d\u3001\u85aa\u6c34\u548c\u90e8\u9580\u3002PRIMARY KEY<\/code>\u7d04\u675f\u78ba\u4fdd\u6bcf\u500b\u54e1\u5de5ID\u90fd\u662f\u552f\u4e00\u7684\u3002<\/p>\n
5. \u4fee\u6539\u8868\u7d50\u69cb<\/h2>\n
\u5982\u679c\u9700\u8981\u4fee\u6539\u5df2\u5b58\u5728\u8868\u7684\u7d50\u69cb\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE<\/code>\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u6dfb\u52a0\u65b0\u5217\u7684\u7bc4\u4f8b\uff1a<\/p>\n
ALTER TABLE \u54e1\u5de5\nADD COLUMN \u96fb\u5b50\u90f5\u4ef6 VARCHAR(100);<\/code><\/pre>\n
\u9019\u500b\u8a9e\u53e5\u5c07\u5728\u201c\u54e1\u5de5\u201d\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u65b0\u7684\u201c\u96fb\u5b50\u90f5\u4ef6\u201d\u5217\u3002ALTER TABLE<\/code>\u8a9e\u53e5\u9084\u53ef\u4ee5\u7528\u4f86\u522a\u9664\u5217\u6216\u4fee\u6539\u5217\u7684\u6578\u64da\u985e\u578b\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u638c\u63e1DB2\u6578\u64da\u5eab\u7684\u5e38\u7528\u8a9e\u53e5\u5c0d\u65bc\u6578\u64da\u7ba1\u7406\u548c\u64cd\u4f5c\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u4ecb\u7d39\u4e86\u66f4\u65b0\u3001\u522a\u9664\u3001\u67e5\u8a62\u3001\u5275\u5efa\u548c\u4fee\u6539\u8868\u7d50\u69cb\u7684\u57fa\u672c\u8a9e\u53e5\uff0c\u9019\u4e9b\u90fd\u662f\u65e5\u5e38\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u90e8\u5206\u3002\u96a8\u8457\u5c0dDB2\u7684\u6df1\u5165\u4e86\u89e3\uff0c\u60a8\u5c07\u80fd\u5920\u66f4\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\uff0c\u63d0\u5347\u5de5\u4f5c\u6548\u7387\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>\u6216\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5b58\u5132\u9084\u662f\u61c9\u7528\u90e8\u7f72\uff0c\u9078\u64c7\u5408\u9069\u7684\u670d\u52d9\u5668\u90fd\u80fd\u70ba\u60a8\u7684\u696d\u52d9\u5e36\u4f86\u66f4\u5927\u7684\u9748\u6d3b\u6027\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22DB2\u6578\u64da\u5eab\u7684\u5fc5\u5099\u5e38\u7528\u8a9e\u53e5\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u638c\u63e1\u67e5\u8a62\u3001\u66f4\u65b0\u53ca\u7dad\u8b77\u6280\u5de7\uff0c\u52a9\u529b\u6578\u64da\u5206\u6790\u8207\u61c9\u7528\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60679","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60679","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60679"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60679\/revisions"}],"predecessor-version":[{"id":60680,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60679\/revisions\/60680"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}