{"id":96246,"date":"2024-10-20T07:49:16","date_gmt":"2024-10-19T23:49:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96246\/"},"modified":"2024-10-20T07:49:17","modified_gmt":"2024-10-19T23:49:17","slug":"oracle%e4%b8%adsys_connect_by_path%e5%87%bd%e6%95%b8%e7%9a%84%e5%a6%99%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96246\/","title":{"rendered":"Oracle\u4e2dSYS_CONNECT_BY_PATH\u51fd\u6578\u7684\u5999\u7528"},"content":{"rendered":"<h1 id=\"oracle%e4%b8%adsys_connect_by_path%e5%87%bd%e6%95%b8%e7%9a%84%e5%a6%99%e7%94%a8-hxzUzHpcgu\">Oracle\u4e2dSYS_CONNECT_BY_PATH\u51fd\u6578\u7684\u5999\u7528<\/h1>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u8655\u7406\u5c64\u6b21\u7d50\u69cb\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u7d44\u7e54\u7d50\u69cb\u3001\u7522\u54c1\u5206\u985e\u9084\u662f\u5176\u4ed6\u985e\u578b\u7684\u5c64\u6b21\u6578\u64da\uff0c\u80fd\u5920\u6709\u6548\u5730\u67e5\u8a62\u548c\u986f\u793a\u9019\u4e9b\u6578\u64da\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002Oracle\u63d0\u4f9b\u4e86\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u51fd\u6578\u2014\u2014<code>SYS_CONNECT_BY_PATH<\/code>\uff0c\u5b83\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u751f\u6210\u5c64\u6b21\u7d50\u69cb\u7684\u8def\u5f91\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u51fd\u6578\u7684\u7528\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u5999\u7528\u3002<\/p>\n<h2 id=\"sys_connect_by_path%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-hxzUzHpcgu\">SYS_CONNECT_BY_PATH\u51fd\u6578\u6982\u8ff0<\/h2>\n<p><code>SYS_CONNECT_BY_PATH<\/code>\u51fd\u6578\u7684\u4e3b\u8981\u529f\u80fd\u662f\u8fd4\u56de\u5f9e\u6839\u7bc0\u9ede\u5230\u7576\u524d\u7bc0\u9ede\u7684\u8def\u5f91\u3002\u9019\u500b\u51fd\u6578\u901a\u5e38\u8207\u5c64\u6b21\u67e5\u8a62\uff08\u5373\u4f7f\u7528<code>CONNECT BY<\/code>\u5b50\u53e5\u7684\u67e5\u8a62\uff09\u4e00\u8d77\u4f7f\u7528\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SYS_CONNECT_BY_PATH(column_name, delimiter)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>column_name<\/code>\u662f\u8981\u67e5\u8a62\u7684\u5217\uff0c<code>delimiter<\/code>\u662f\u7528\u65bc\u5206\u9694\u8def\u5f91\u4e2d\u5404\u500b\u7bc0\u9ede\u7684\u5b57\u7b26\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-hxzUzHpcgu\">\u4f7f\u7528\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u8868\uff0c\u8a72\u8868\u5305\u542b\u54e1\u5de5\u7684ID\u3001\u59d3\u540d\u548c\u4e0a\u7d1aID\u3002\u4ee5\u4e0b\u662f\u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>\nCREATE TABLE employees (\n    employee_id NUMBER,\n    employee_name VARCHAR2(100),\n    manager_id NUMBER\n);\n<\/code><\/pre>\n<p>\u6211\u5011\u53ef\u4ee5\u63d2\u5165\u4e00\u4e9b\u793a\u4f8b\u6578\u64da\uff1a<\/p>\n<pre><code>\nINSERT INTO employees VALUES (1, 'CEO', NULL);\nINSERT INTO employees VALUES (2, 'Manager A', 1);\nINSERT INTO employees VALUES (3, 'Manager B', 1);\nINSERT INTO employees VALUES (4, 'Employee A1', 2);\nINSERT INTO employees VALUES (5, 'Employee A2', 2);\nINSERT INTO employees VALUES (6, 'Employee B1', 3);\n<\/code><\/pre>\n<p>\u73fe\u5728\uff0c\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u6bcf\u4f4d\u54e1\u5de5\u7684\u5b8c\u6574\u5c64\u6b21\u8def\u5f91\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>\nSELECT employee_id,\n       employee_name,\n       SYS_CONNECT_BY_PATH(employee_name, ' -&gt; ') AS path\nFROM employees\nSTART WITH manager_id IS NULL\nCONNECT BY PRIOR employee_id = manager_id;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u4f4d\u54e1\u5de5\u7684ID\u3001\u59d3\u540d\u4ee5\u53ca\u5f9e\u6839\u7bc0\u9ede\u5230\u8a72\u54e1\u5de5\u7684\u5b8c\u6574\u8def\u5f91\u3002\u7d50\u679c\u53ef\u80fd\u5982\u4e0b\uff1a<\/p>\n<pre><code>\n1 | CEO                | CEO\n2 | Manager A         | CEO -&gt; Manager A\n3 | Manager B         | CEO -&gt; Manager B\n4 | Employee A1      | CEO -&gt; Manager A -&gt; Employee A1\n5 | Employee A2      | CEO -&gt; Manager A -&gt; Employee A2\n6 | Employee B1      | CEO -&gt; Manager B -&gt; Employee B1\n<\/code><\/pre>\n<h2 id=\"sys_connect_by_path%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-hxzUzHpcgu\">SYS_CONNECT_BY_PATH\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u9019\u500b\u51fd\u6578\u5728\u591a\u7a2e\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u5e7e\u500b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u7d44\u7e54\u7d50\u69cb\u5716\uff1a<\/strong>\u53ef\u4ee5\u7528\u4f86\u751f\u6210\u516c\u53f8\u5167\u90e8\u7684\u7d44\u7e54\u7d50\u69cb\u5716\uff0c\u5e6b\u52a9\u7ba1\u7406\u5c64\u4e86\u89e3\u5404\u90e8\u9580\u4e4b\u9593\u7684\u5c64\u6b21\u95dc\u4fc2\u3002<\/li>\n<li><strong>\u7522\u54c1\u5206\u985e\uff1a<\/strong>\u5728\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u4e2d\uff0c\u53ef\u4ee5\u7528\u4f86\u986f\u793a\u7522\u54c1\u7684\u5206\u985e\u8def\u5f91\uff0c\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u627e\u5230\u6240\u9700\u7522\u54c1\u3002<\/li>\n<li><strong>\u6578\u64da\u5206\u6790\uff1a<\/strong>\u5728\u6578\u64da\u5206\u6790\u4e2d\uff0c\u53ef\u4ee5\u7528\u4f86\u751f\u6210\u5c64\u6b21\u7d50\u69cb\u7684\u5831\u544a\uff0c\u4fbf\u65bc\u5206\u6790\u548c\u6c7a\u7b56\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-hxzUzHpcgu\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u4e2d\u7684<code>SYS_CONNECT_BY_PATH<\/code>\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u8f15\u9b06\u5730\u8655\u7406\u548c\u986f\u793a\u5c64\u6b21\u7d50\u69cb\u6578\u64da\u3002\u901a\u904e\u7c21\u55ae\u7684\u67e5\u8a62\uff0c\u60a8\u53ef\u4ee5\u7372\u5f97\u5f9e\u6839\u7bc0\u9ede\u5230\u7576\u524d\u7bc0\u9ede\u7684\u5b8c\u6574\u8def\u5f91\uff0c\u9019\u5728\u8a31\u591a\u696d\u52d9\u5834\u666f\u4e2d\u90fd\u5177\u6709\u91cd\u8981\u7684\u61c9\u7528\u50f9\u503c\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<code>SYS_CONNECT_BY_PATH<\/code>\u51fd\u6578\u4f86\u63d0\u5347\u60a8\u7684\u6578\u64da\u67e5\u8a62\u80fd\u529b\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u4e2dSYS_CONNECT_BY_PATH\u51fd\u6570\u7684\u5f3a\u5927\u529f\u80fd\uff0c\u8f7b\u677e\u5b9e\u73b0\u5c42\u6b21\u7ed3\u6784\u6570\u636e\u7684\u8def\u5f84\u67e5\u8be2\u4e0e\u5c55\u793a\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-96246","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96246","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=96246"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96246\/revisions"}],"predecessor-version":[{"id":96247,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96246\/revisions\/96247"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96246"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96246"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96246"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}