{"id":60451,"date":"2024-10-13T02:58:15","date_gmt":"2024-10-12T18:58:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60451\/"},"modified":"2024-10-13T02:58:15","modified_gmt":"2024-10-12T18:58:15","slug":"db2%e5%89%b5%e5%bb%ba%e5%a4%96%e9%8d%b5%e6%99%82%e9%81%b8%e9%a0%85%e5%a6%82%e4%bd%95%e5%bf%ab%e9%80%9f%e6%8e%8c%e6%8f%a1%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60451\/","title":{"rendered":"DB2\u5275\u5efa\u5916\u9375\u6642\u9078\u9805\u5982\u4f55\u5feb\u901f\u638c\u63e1\uff1f"},"content":{"rendered":"<h1 id=\"db2%e5%89%b5%e5%bb%ba%e5%a4%96%e9%8d%b5%e6%99%82%e9%81%b8%e9%a0%85%e5%a6%82%e4%bd%95%e5%bf%ab%e9%80%9f%e6%8e%8c%e6%8f%a1%ef%bc%9f-ggeZkokEna\">DB2\u5275\u5efa\u5916\u9375\u6642\u9078\u9805\u5982\u4f55\u5feb\u901f\u638c\u63e1\uff1f<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u8a2d\u8a08\u4e2d\uff0c\u5916\u9375\uff08Foreign Key\uff09\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u7528\u65bc\u5efa\u7acb\u5169\u500b\u8cc7\u6599\u8868\u4e4b\u9593\u7684\u95dc\u806f\u6027\u3002\u5728IBM\u7684DB2\u8cc7\u6599\u5eab\u4e2d\uff0c\u5275\u5efa\u5916\u9375\u7684\u904e\u7a0b\u6d89\u53ca\u591a\u500b\u9078\u9805\uff0c\u4e86\u89e3\u9019\u4e9b\u9078\u9805\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u8a2d\u8a08\u8cc7\u6599\u5eab\u7d50\u69cb\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eDB2\u4e2d\u5275\u5efa\u5916\u9375\u7684\u9078\u9805\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%a4%96%e9%8d%b5%ef%bc%9f-ggeZkokEna\">\u4ec0\u9ebc\u662f\u5916\u9375\uff1f<\/h2>\n<p>\u5916\u9375\u662f\u4e00\u500b\u8cc7\u6599\u8868\u4e2d\u7684\u6b04\u4f4d\uff0c\u5b83\u6307\u5411\u53e6\u4e00\u500b\u8cc7\u6599\u8868\u7684\u4e3b\u9375\u3002\u9019\u7a2e\u95dc\u806f\u6027\u78ba\u4fdd\u4e86\u8cc7\u6599\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u300c\u8a02\u55ae\u300d\u8868\u548c\u4e00\u500b\u300c\u5ba2\u6236\u300d\u8868\uff0c\u8a02\u55ae\u8868\u4e2d\u7684\u300c\u5ba2\u6236ID\u300d\u53ef\u4ee5\u4f5c\u70ba\u5916\u9375\uff0c\u6307\u5411\u5ba2\u6236\u8868\u4e2d\u7684\u300c\u5ba2\u6236ID\u300d\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u4e00\u7b46\u8a02\u55ae\u90fd\u5c0d\u61c9\u5230\u4e00\u4f4d\u6709\u6548\u7684\u5ba2\u6236\u3002<\/p>\n<h2 id=\"db2%e4%b8%ad%e5%89%b5%e5%bb%ba%e5%a4%96%e9%8d%b5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-ggeZkokEna\">DB2\u4e2d\u5275\u5efa\u5916\u9375\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u5275\u5efa\u5916\u9375\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d\nADD CONSTRAINT \u5916\u9375\u540d\u7a31\nFOREIGN KEY (\u5916\u9375\u6b04\u4f4d)\nREFERENCES \u53c3\u8003\u8868\u540d (\u4e3b\u9375\u6b04\u4f4d);\n<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u300c\u8a02\u55ae\u300d\u8868\u4e2d\u5275\u5efa\u4e00\u500b\u6307\u5411\u300c\u5ba2\u6236\u300d\u8868\u7684\u5916\u9375\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8a02\u55ae\nADD CONSTRAINT fk_customer\nFOREIGN KEY (\u5ba2\u6236ID)\nREFERENCES \u5ba2\u6236 (\u5ba2\u6236ID);\n<\/code><\/pre>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e9%81%b8%e9%a0%85%e8%a7%a3%e6%9e%90-ggeZkokEna\">\u5916\u9375\u9078\u9805\u89e3\u6790<\/h2>\n<p>\u5728\u5275\u5efa\u5916\u9375\u6642\uff0cDB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u9805\uff0c\u9019\u4e9b\u9078\u9805\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u7cbe\u78ba\u5730\u63a7\u5236\u5916\u9375\u7684\u884c\u70ba\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u9078\u9805\uff1a<\/p>\n<ul>\n<li><strong>ON DELETE CASCADE<\/strong>\uff1a\u7576\u53c3\u8003\u8868\u4e2d\u7684\u4e3b\u9375\u88ab\u522a\u9664\u6642\uff0c\u6240\u6709\u5f15\u7528\u8a72\u4e3b\u9375\u7684\u5916\u9375\u8a18\u9304\u4e5f\u6703\u81ea\u52d5\u522a\u9664\u3002<\/li>\n<li><strong>ON DELETE SET NULL<\/strong>\uff1a\u7576\u53c3\u8003\u8868\u4e2d\u7684\u4e3b\u9375\u88ab\u522a\u9664\u6642\uff0c\u6240\u6709\u5f15\u7528\u8a72\u4e3b\u9375\u7684\u5916\u9375\u8a18\u9304\u5c07\u88ab\u8a2d\u7f6e\u70baNULL\u3002<\/li>\n<li><strong>ON UPDATE CASCADE<\/strong>\uff1a\u7576\u53c3\u8003\u8868\u4e2d\u7684\u4e3b\u9375\u88ab\u66f4\u65b0\u6642\uff0c\u6240\u6709\u5f15\u7528\u8a72\u4e3b\u9375\u7684\u5916\u9375\u8a18\u9304\u4e5f\u6703\u81ea\u52d5\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u9078\u9805\u53ef\u4ee5\u5728\u5275\u5efa\u5916\u9375\u6642\u9032\u884c\u8a2d\u7f6e\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>ALTER TABLE \u8a02\u55ae\nADD CONSTRAINT fk_customer\nFOREIGN KEY (\u5ba2\u6236ID)\nREFERENCES \u5ba2\u6236 (\u5ba2\u6236ID)\nON DELETE CASCADE;\n<\/code><\/pre>\n<h2 id=\"%e5%a4%96%e9%8d%b5%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-ggeZkokEna\">\u5916\u9375\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u8a2d\u8a08\u8cc7\u6599\u5eab\u6642\uff0c\u9075\u5faa\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u63d0\u9ad8\u8cc7\u6599\u5eab\u7684\u6027\u80fd\u548c\u53ef\u7dad\u8b77\u6027\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u5916\u9375\u6307\u5411\u7684\u4e3b\u9375\u662f\u552f\u4e00\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u8cc7\u6599\u4e0d\u4e00\u81f4\u7684\u554f\u984c\u3002<\/li>\n<li>\u5728\u8a2d\u8a08\u5916\u9375\u6642\uff0c\u8003\u616e\u4f7f\u7528\u9069\u7576\u7684\u9078\u9805\uff0c\u4ee5\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u3002<\/li>\n<li>\u5b9a\u671f\u6aa2\u67e5\u8cc7\u6599\u5eab\u7684\u5b8c\u6574\u6027\uff0c\u78ba\u4fdd\u5916\u9375\u7d04\u675f\u672a\u88ab\u7834\u58de\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ggeZkokEna\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1DB2\u4e2d\u5275\u5efa\u5916\u9375\u7684\u9078\u9805\u5c0d\u65bc\u8cc7\u6599\u5eab\u8a2d\u8a08\u81f3\u95dc\u91cd\u8981\u3002\u900f\u904e\u6b63\u78ba\u4f7f\u7528\u5916\u9375\u53ca\u5176\u9078\u9805\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7dad\u8b77\u8cc7\u6599\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u8cc7\u6599\u5eab\u89e3\u6c7a\u65b9\u6848\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1DB2\u5275\u5efa\u5916\u9375\u7684\u9078\u9805\uff0c\u5feb\u901f\u5b78\u7fd2\u5982\u4f55\u8a2d\u7f6e\u548c\u7ba1\u7406\u6578\u64da\u5eab\u95dc\u806f\uff0c\u63d0\u5347\u6578\u64da\u5b8c\u6574\u6027\u8207\u67e5\u8a62\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-60451","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60451","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=60451"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60451\/revisions"}],"predecessor-version":[{"id":60452,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60451\/revisions\/60452"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}