{"id":20794,"date":"2024-01-02T06:03:23","date_gmt":"2024-01-02T06:03:23","guid":{"rendered":"https:\/\/server.hk\/blog\/20794\/"},"modified":"2024-11-14T10:38:33","modified_gmt":"2024-11-14T02:38:33","slug":"postgresql-command-create-access-method","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20794\/","title":{"rendered":"PostgreSQL \u547d\u4ee4\uff1aCREATE ACCESS METHOD"},"content":{"rendered":"<h1 id=\"postgresql-command-create-access-method-KoXcUKEacs\">PostgreSQL \u547d\u4ee4\uff1aCREATE ACCESS METHOD<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u5ee3\u6cdb\u7684\u529f\u80fd\u548c\u80fd\u529b\u3002PostgreSQL \u7684\u4e00\u500b\u91cd\u8981\u7279\u9ede\u662f\u5176\u9748\u6d3b\u6027\u548c\u53ef\u64f4\u5c55\u6027\uff0c\u5141\u8a31\u7528\u6236\u5275\u5efa\u81ea\u5b9a\u7fa9\u7684\u8a2a\u554f\u65b9\u6cd5\uff0c\u4ee5\u512a\u5316\u6578\u64da\u6aa2\u7d22\u548c\u5b58\u5132\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e PostgreSQL \u547d\u4ee4 CREATE ACCESS METHOD \u53ca\u5176\u5728\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"understanding-access-methods-KoXcUKEacs\">\u7406\u89e3\u8a2a\u554f\u65b9\u6cd5<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u8a2a\u554f\u65b9\u6cd5\u8ca0\u8cac\u6709\u6548\u5730\u5f9e\u78c1\u789f\u5b58\u5132\u4e2d\u7d44\u7e54\u548c\u6aa2\u7d22\u6578\u64da\u3002PostgreSQL \u4f7f\u7528\u7684\u9810\u8a2d\u8a2a\u554f\u65b9\u6cd5\u662f B-tree\uff0c\u9019\u9069\u7528\u65bc\u5927\u591a\u6578\u901a\u7528\u5834\u666f\u3002\u7136\u800c\uff0c\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u81ea\u5b9a\u7fa9\u7684\u8a2a\u554f\u65b9\u6cd5\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u7279\u5b9a\u6578\u64da\u8a2a\u554f\u6a21\u5f0f\u7684\u6027\u80fd\u3002<\/p>\n<p>PostgreSQL \u4e2d\u7684\u8a2a\u554f\u65b9\u6cd5\u662f\u4ee5\u64f4\u5c55\u5f62\u5f0f\u5be6\u73fe\u7684\uff0c\u9019\u610f\u5473\u8457\u5b83\u5011\u53ef\u4ee5\u6839\u64da\u9700\u8981\u6dfb\u52a0\u6216\u5f9e\u6578\u64da\u5eab\u4e2d\u79fb\u9664\u3002CREATE ACCESS METHOD \u547d\u4ee4\u5141\u8a31\u7528\u6236\u5728\u6578\u64da\u5eab\u4e2d\u5b9a\u7fa9\u4e26\u8a3b\u518a\u65b0\u7684\u8a2a\u554f\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"creating-a-custom-access-method-KoXcUKEacs\">\u5275\u5efa\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5<\/h2>\n<p>\u8981\u5728 PostgreSQL \u4e2d\u5275\u5efa\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\uff0c\u60a8\u9700\u8981\u9075\u5faa\u4ee5\u4e0b\u6b65\u9a5f\uff1a<\/p>\n<ol>\n<li>\u5be6\u73fe\u8a2a\u554f\u65b9\u6cd5\u908f\u8f2f\uff1a\u7b2c\u4e00\u6b65\u662f\u7de8\u5beb\u5be6\u73fe\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\u7684\u4ee3\u78bc\u3002\u6b64\u4ee3\u78bc\u61c9\u6839\u64da\u60a8\u7684\u5177\u9ad4\u9700\u6c42\u4f86\u8655\u7406\u6578\u64da\u6aa2\u7d22\u548c\u5b58\u5132\u3002<\/li>\n<li>\u7de8\u8b6f\u8a2a\u554f\u65b9\u6cd5\u4ee3\u78bc\uff1a\u4e00\u65e6\u5be6\u73fe\u4e86\u8a2a\u554f\u65b9\u6cd5\u908f\u8f2f\uff0c\u60a8\u9700\u8981\u5c07\u5176\u7de8\u8b6f\u70ba\u53ef\u7531 PostgreSQL \u52a0\u8f09\u7684\u5171\u4eab\u5eab\u3002<\/li>\n<li>\u5275\u5efa\u8a2a\u554f\u65b9\u6cd5\uff1a\u4f7f\u7528 CREATE ACCESS METHOD \u547d\u4ee4\uff0c\u60a8\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u4e2d\u8a3b\u518a\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\u3002\u547d\u4ee4\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/li>\n<\/ol>\n<pre><code>CREATE ACCESS METHOD access_method_name\r\n  TYPE access_method_type\r\n  HANDLER access_method_handler_function\r\n  VALIDATOR access_method_validator_function;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>access_method_name<\/code> \u662f\u8a2a\u554f\u65b9\u6cd5\u7684\u540d\u7a31\uff0c<code>access_method_type<\/code> \u6307\u5b9a\u8a2a\u554f\u65b9\u6cd5\u7684\u985e\u578b\uff08\u4f8b\u5982\uff0c&#8217;btree&#8217; \u4ee3\u8868 B-tree\uff09\uff0c<code>access_method_handler_function<\/code> \u662f\u5be6\u73fe\u8a2a\u554f\u65b9\u6cd5\u908f\u8f2f\u7684\u51fd\u6578\u540d\u7a31\uff0c\u800c <code>access_method_validator_function<\/code> \u662f\u4e00\u500b\u53ef\u9078\u7684\u51fd\u6578\uff0c\u7528\u65bc\u9a57\u8b49\u8a2a\u554f\u65b9\u6cd5\u7684\u914d\u7f6e\u3002<\/p>\n<h2 id=\"using-the-custom-access-method-KoXcUKEacs\">\u4f7f\u7528\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5<\/h2>\n<p>\u7576\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u4e26\u8a3b\u518a\u5f8c\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u5b83\u4f86\u70ba\u7279\u5b9a\u7684\u5217\u5275\u5efa\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u60a8\u6709\u4e00\u500b\u540d\u70ba &#8216;my_access_method&#8217; \u7684\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX index_name\r\n  ON table_name\r\n  USING access_method_name (column_name);<\/code><\/pre>\n<p>\u901a\u904e\u5728 <code>USING<\/code> \u5b50\u53e5\u4e2d\u6307\u5b9a\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\uff0cPostgreSQL \u5c07\u4f7f\u7528\u5b9a\u7fa9\u7684\u908f\u8f2f\u4f86\u7d44\u7e54\u548c\u6aa2\u7d22\u8a72\u7d22\u5f15\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"conclusion-KoXcUKEacs\">\u7d50\u8ad6<\/h2>\n<p>PostgreSQL \u4e2d\u7684 CREATE ACCESS METHOD \u547d\u4ee4\u5141\u8a31\u7528\u6236\u5275\u5efa\u4e26\u8a3b\u518a\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\uff0c\u63d0\u4f9b\u4e86\u91dd\u5c0d\u7279\u5b9a\u6578\u64da\u8a2a\u554f\u6a21\u5f0f\u7684\u9748\u6d3b\u6027\u548c\u512a\u5316\u9078\u9805\u3002\u901a\u904e\u5be6\u73fe\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u63d0\u9ad8 PostgreSQL \u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u4e26\u6539\u5584\u6578\u64da\u6aa2\u7d22\u548c\u5b58\u5132\u7684\u6548\u7387\u3002<\/p>\n<h2 id=\"summary-KoXcUKEacs\">\u7e3d\u7d50<\/h2>\n<p>\u7e3d\u7684\u4f86\u8aaa\uff0cPostgreSQL \u4e2d\u7684 CREATE ACCESS METHOD \u547d\u4ee4\u5141\u8a31\u7528\u6236\u5275\u5efa\u4e26\u8a3b\u518a\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\uff0c\u4ee5\u512a\u5316\u6578\u64da\u6aa2\u7d22\u548c\u5b58\u5132\u3002\u901a\u904e\u5be6\u73fe\u81ea\u5b9a\u7fa9\u8a2a\u554f\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u63d0\u5347 PostgreSQL \u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u6b32\u4e86\u89e3\u66f4\u591a\u6709\u95dc PostgreSQL \u53ca\u5176\u529f\u80fd\u7684\u4fe1\u606f\uff0c\u8acb\u8003\u616e\u63a2\u7d22 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u9019\u662f\u4e00\u5bb6\u9818\u5148\u7684 VPS \u8a17\u7ba1\u516c\u53f8\uff0c\u63d0\u4f9b\u53ef\u9760\u4e14\u9ad8\u6548\u7684\u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u547d\u4ee4\uff1aCR&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-20794","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20794","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=20794"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20794\/revisions"}],"predecessor-version":[{"id":24302,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20794\/revisions\/24302"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20794"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20794"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}