{"id":60445,"date":"2024-10-13T02:55:16","date_gmt":"2024-10-12T18:55:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60445\/"},"modified":"2024-10-13T02:55:16","modified_gmt":"2024-10-12T18:55:16","slug":"db2%e5%89%b5%e5%bb%ba%e8%a1%a8-%e5%b8%b6%e6%9c%89%e8%87%aa%e5%a2%9e%e5%88%97%e7%9a%84%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60445\/","title":{"rendered":"DB2\u5275\u5efa\u8868–\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868"},"content":{"rendered":"

DB2\u5275\u5efa\u8868–\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u8868\u662f\u7528\u4f86\u5b58\u5132\u6578\u64da\u7684\u57fa\u672c\u7d50\u69cb\u3002IBM\u7684DB2\u662f\u4e00\u500b\u5f37\u5927\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u4f01\u696d\u7d1a\u61c9\u7528\u4e2d\u3002\u5728DB2\u4e2d\uff0c\u5275\u5efa\u4e00\u500b\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868\u53ef\u4ee5\u7c21\u5316\u6578\u64da\u7684\u63d2\u5165\u904e\u7a0b\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u552f\u4e00\u6a19\u8b58\u7b26\u7684\u60c5\u6cc1\u4e0b\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728DB2\u4e2d\u5275\u5efa\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n

\u81ea\u589e\u5217\u7684\u6982\u5ff5<\/h2>\n

\u81ea\u589e\u5217\uff08Auto Increment Column\uff09\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5217\u985e\u578b\uff0c\u7576\u65b0\u8a18\u9304\u88ab\u63d2\u5165\u5230\u8868\u4e2d\u6642\uff0c\u8a72\u5217\u7684\u503c\u6703\u81ea\u52d5\u589e\u52a0\u3002\u9019\u901a\u5e38\u7528\u65bc\u4e3b\u9375\uff0c\u4ee5\u78ba\u4fdd\u6bcf\u689d\u8a18\u9304\u90fd\u6709\u552f\u4e00\u7684\u6a19\u8b58\u7b26\u3002\u5728DB2\u4e2d\uff0c\u81ea\u589e\u5217\u7684\u5be6\u73fe\u662f\u901a\u904e\u4f7f\u7528\u5e8f\u5217\uff08Sequence\uff09\u4f86\u5b8c\u6210\u7684\u3002<\/p>\n

\u5275\u5efa\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868<\/h2>\n

\u5728DB2\u4e2d\u5275\u5efa\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868\u7684\u57fa\u672c\u6b65\u9a5f\u5982\u4e0b\uff1a<\/p>\n

    \n
  1. \u9996\u5148\uff0c\u5275\u5efa\u4e00\u500b\u5e8f\u5217\uff0c\u9019\u500b\u5e8f\u5217\u5c07\u7528\u65bc\u751f\u6210\u81ea\u589e\u7684\u503c\u3002<\/li>\n
  2. \u7136\u5f8c\uff0c\u4f7f\u7528\u8a72\u5e8f\u5217\u4f86\u5b9a\u7fa9\u8868\u4e2d\u7684\u81ea\u589e\u5217\u3002<\/li>\n<\/ol>\n

    \u6b65\u9a5f1\uff1a\u5275\u5efa\u5e8f\u5217<\/h3>\n

    \u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u5275\u5efa\u4e00\u500b\u5e8f\u5217\uff1a<\/p>\n

    CREATE SEQUENCE my_sequence\n    START WITH 1\n    INCREMENT BY 1\n    NO CYCLE;<\/code><\/pre>\n
    \u9019\u6bb5\u4ee3\u78bc\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70bamy_sequence<\/code>\u7684\u5e8f\u5217\uff0c\u5f9e1\u958b\u59cb\uff0c\u6bcf\u6b21\u589e\u52a01\uff0c\u4e26\u4e14\u4e0d\u6703\u5faa\u74b0\u3002<\/p>\n
    \u6b65\u9a5f2\uff1a\u5275\u5efa\u8868<\/h3>\n
    \u63a5\u4e0b\u4f86\uff0c\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u5275\u5efa\u4e00\u500b\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868\uff1a<\/p>\n
    CREATE TABLE my_table (\n    id INT NOT NULL DEFAULT NEXT VALUE FOR my_sequence PRIMARY KEY,\n    name VARCHAR(100),\n    created_at TIMESTAMP DEFAULT CURRENT TIMESTAMP\n);<\/code><\/pre>\n
    \u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0cid<\/code>\u5217\u88ab\u5b9a\u7fa9\u70ba\u6574\u6578\u985e\u578b\uff0c\u4e26\u4e14\u8a2d\u7f6e\u70ba\u81ea\u589e\u5217\uff0c\u4f7f\u7528NEXT VALUE FOR my_sequence<\/code>\u4f86\u7372\u53d6\u5e8f\u5217\u7684\u4e0b\u4e00\u500b\u503c\u3002\u9019\u6a23\uff0c\u6bcf\u7576\u63d2\u5165\u65b0\u8a18\u9304\u6642\uff0cid<\/code>\u5217\u7684\u503c\u5c07\u81ea\u52d5\u589e\u52a0\u3002<\/p>\n
    \u63d2\u5165\u6578\u64da<\/h2>\n
    \u5275\u5efa\u8868\u5f8c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u63d2\u5165\u6578\u64da\uff1a<\/p>\n
    INSERT INTO my_table (name) VALUES ('Alice');\nINSERT INTO my_table (name) VALUES ('Bob');<\/code><\/pre>\n
    \u5728\u63d2\u5165\u6578\u64da\u6642\uff0c\u7121\u9700\u6307\u5b9aid<\/code>\u5217\u7684\u503c\uff0cDB2\u6703\u81ea\u52d5\u70ba\u5176\u5206\u914d\u552f\u4e00\u7684\u503c\u3002<\/p>\n
    \u67e5\u8a62\u6578\u64da<\/h2>\n
    \u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u67e5\u8a62\u8868\u4e2d\u7684\u6578\u64da\uff1a<\/p>\n
    SELECT * FROM my_table;<\/code><\/pre>\n
    \u9019\u5c07\u8fd4\u56de\u8868\u4e2d\u6240\u6709\u7684\u8a18\u9304\uff0c\u5305\u62ec\u81ea\u589e\u7684id<\/code>\u5217\u3002<\/p>\n
    \u7e3d\u7d50<\/h2>\n
    \u5728DB2\u4e2d\u5275\u5efa\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u904e\u7a0b\u3002\u901a\u904e\u4f7f\u7528\u5e8f\u5217\u4f86\u751f\u6210\u552f\u4e00\u7684\u6a19\u8b58\u7b26\uff0c\u53ef\u4ee5\u7c21\u5316\u6578\u64da\u7684\u63d2\u5165\u548c\u7ba1\u7406\u3002\u9019\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\u5c24\u70ba\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u9700\u6c42\u6709\u8208\u8da3\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5b78\u7fd2\u5982\u4f55\u5728DB2\u4e2d\u5275\u5efa\u5e36\u6709\u81ea\u589e\u5217\u7684\u8868\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u6548\u7387\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-60445","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60445","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=60445"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60445\/revisions"}],"predecessor-version":[{"id":60446,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60445\/revisions\/60446"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}