{"id":96910,"date":"2024-10-20T13:23:14","date_gmt":"2024-10-20T05:23:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96910\/"},"modified":"2024-10-20T13:23:15","modified_gmt":"2024-10-20T05:23:15","slug":"postgresql%e7%9a%84%e6%95%b8%e7%b5%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96910\/","title":{"rendered":"PostgreSQL\u7684\u6578\u7d44"},"content":{"rendered":"<h1 id=\"postgresql%e7%9a%84%e6%95%b8%e7%b5%84-VLLxNFdXBa\">PostgreSQL\u7684\u6578\u7d44<\/h1>\n<p>PostgreSQL\u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u5176\u652f\u6301\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5176\u4e2d\u6578\u7d44\uff08Array\uff09\u662f\u4e00\u500b\u7279\u5225\u6709\u7528\u7684\u7279\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0ePostgreSQL\u4e2d\u7684\u6578\u7d44\uff0c\u5305\u62ec\u5176\u5b9a\u7fa9\u3001\u4f7f\u7528\u65b9\u6cd5\u53ca\u5be6\u969b\u61c9\u7528\u6848\u4f8b\u3002<\/p>\n<h2 id=\"%e6%95%b8%e7%b5%84%e7%9a%84%e5%ae%9a%e7%be%a9-VLLxNFdXBa\">\u6578\u7d44\u7684\u5b9a\u7fa9<\/h2>\n<p>\u5728PostgreSQL\u4e2d\uff0c\u6578\u7d44\u662f\u4e00\u7a2e\u53ef\u4ee5\u5b58\u5132\u591a\u500b\u76f8\u540c\u985e\u578b\u6578\u64da\u7684\u6578\u64da\u7d50\u69cb\u3002\u9019\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u5728\u4e00\u500b\u5b57\u6bb5\u4e2d\u5b58\u5132\u591a\u500b\u503c\uff0c\u800c\u4e0d\u5fc5\u5275\u5efa\u591a\u500b\u884c\u6216\u8868\u3002\u6578\u7d44\u53ef\u4ee5\u662f\u4efb\u610f\u7dad\u5ea6\u7684\uff0c\u6700\u5e38\u898b\u7684\u662f\u4e00\u7dad\u548c\u4e8c\u7dad\u6578\u7d44\u3002<\/p>\n<h2 id=\"%e6%95%b8%e7%b5%84%e7%9a%84%e5%89%b5%e5%bb%ba%e8%88%87%e4%bd%bf%e7%94%a8-VLLxNFdXBa\">\u6578\u7d44\u7684\u5275\u5efa\u8207\u4f7f\u7528<\/h2>\n<p>\u8981\u5728PostgreSQL\u4e2d\u5275\u5efa\u6578\u7d44\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>CREATE TABLE example (\n    id SERIAL PRIMARY KEY,\n    numbers INTEGER[]\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba\u201cexample\u201d\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b\u6574\u6578\u6578\u7d44\u5b57\u6bb5\u201cnumbers\u201d\u3002\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u53ef\u4ee5\u63d2\u5165\u6578\u64da\uff1a<\/p>\n<pre><code>INSERT INTO example (numbers) VALUES (ARRAY[1, 2, 3, 4, 5]);<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u4e00\u500b\u6574\u6578\u6578\u7d44\u63d2\u5165\u5230\u8868\u4e2d\u3002\u7528\u6236\u4e5f\u53ef\u4ee5\u4f7f\u7528\u82b1\u62ec\u865f\u8a9e\u6cd5\u4f86\u63d2\u5165\u6578\u7d44\uff1a<\/p>\n<pre><code>INSERT INTO example (numbers) VALUES ('{1,2,3,4,5}');<\/code><\/pre>\n<h2 id=\"%e6%95%b8%e7%b5%84%e7%9a%84%e6%9f%a5%e8%a9%a2-VLLxNFdXBa\">\u6578\u7d44\u7684\u67e5\u8a62<\/h2>\n<p>\u67e5\u8a62\u6578\u7d44\u4e2d\u7684\u6578\u64da\u4e5f\u975e\u5e38\u7c21\u55ae\u3002\u7528\u6236\u53ef\u4ee5\u4f7f\u7528\u201cANY\u201d\u548c\u201cALL\u201d\u95dc\u9375\u5b57\u4f86\u67e5\u8a62\u6578\u7d44\u4e2d\u7684\u5143\u7d20\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5305\u542b\u6578\u5b573\u7684\u884c\uff1a<\/p>\n<pre><code>SELECT * FROM example WHERE 3 = ANY(numbers);<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u7528\u6236\u9084\u53ef\u4ee5\u4f7f\u7528\u6578\u7d44\u51fd\u6578\u4f86\u64cd\u4f5c\u6578\u7d44\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>array_length<\/strong>\uff1a\u8fd4\u56de\u6578\u7d44\u7684\u9577\u5ea6\u3002<\/li>\n<li><strong>unnest<\/strong>\uff1a\u5c07\u6578\u7d44\u5c55\u958b\u70ba\u591a\u884c\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528\u201cunnest\u201d\u51fd\u6578\u53ef\u4ee5\u5c07\u6578\u7d44\u4e2d\u7684\u6bcf\u500b\u5143\u7d20\u5c55\u958b\u70ba\u55ae\u7368\u7684\u884c\uff1a<\/p>\n<pre><code>SELECT unnest(numbers) FROM example;<\/code><\/pre>\n<h2 id=\"%e6%95%b8%e7%b5%84%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-VLLxNFdXBa\">\u6578\u7d44\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<p>\u6578\u7d44\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5728\u8655\u7406\u7528\u6236\u7684\u8208\u8da3\u6216\u6a19\u7c64\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u6578\u7d44\u4f86\u5b58\u5132\u591a\u500b\u8208\u8da3\u6216\u6a19\u7c64\uff0c\u800c\u4e0d\u5fc5\u5275\u5efa\u984d\u5916\u7684\u8868\u3002\u9019\u6a23\u4e0d\u50c5\u7c21\u5316\u4e86\u6578\u64da\u7d50\u69cb\uff0c\u9084\u63d0\u9ad8\u4e86\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<p>\u53e6\u4e00\u500b\u4f8b\u5b50\u662f\u5728\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u4e2d\uff0c\u7522\u54c1\u53ef\u80fd\u6709\u591a\u500b\u984f\u8272\u6216\u5c3a\u5bf8\u3002\u4f7f\u7528\u6578\u7d44\u53ef\u4ee5\u65b9\u4fbf\u5730\u5b58\u5132\u9019\u4e9b\u9078\u9805\uff0c\u4e26\u5728\u67e5\u8a62\u6642\u8f15\u9b06\u6aa2\u7d22\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-VLLxNFdXBa\">\u7d50\u8ad6<\/h2>\n<p>PostgreSQL\u7684\u6578\u7d44\u529f\u80fd\u70ba\u6578\u64da\u5b58\u5132\u548c\u67e5\u8a62\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\u548c\u4fbf\u5229\u6027\u3002\u901a\u904e\u4f7f\u7528\u6578\u7d44\uff0c\u7528\u6236\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5b58\u5132\u591a\u500b\u503c\u7684\u60c5\u6cc1\u4e0b\u3002\u7121\u8ad6\u662f\u5728\u958b\u767c\u65b0\u61c9\u7528\u7a0b\u5e8f\u9084\u662f\u512a\u5316\u73fe\u6709\u7cfb\u7d71\uff0c\u7406\u89e3\u548c\u5229\u7528PostgreSQL\u7684\u6578\u7d44\u7279\u6027\u90fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u4f7f\u7528PostgreSQL\u6216\u5176\u4ed6\u6578\u64da\u5eab\u6280\u8853\u6709\u8208\u8da3\uff0c\u4e26\u5e0c\u671b\u5728\u9999\u6e2f\u5c0b\u627e\u5408\u9069\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">VPS<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u63d0\u4f9b\u60a8\u6240\u9700\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22PostgreSQL\u7684\u6578\u7d44\u529f\u80fd\uff0c\u4e86\u89e3\u5982\u4f55\u9ad8\u6548\u5b58\u5132\u548c\u64cd\u4f5c\u591a\u7dad\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u9748\u6d3b\u6027\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-96910","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96910","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=96910"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96910\/revisions"}],"predecessor-version":[{"id":96911,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96910\/revisions\/96911"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96910"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96910"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96910"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}