{"id":178772,"date":"2024-11-08T20:46:18","date_gmt":"2024-11-08T12:46:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/178772\/"},"modified":"2024-11-08T20:46:19","modified_gmt":"2024-11-08T12:46:19","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9postgresql%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a22034-more_than_one_sql_json_item%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/178772\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a22034 &#8211; more_than_one_sql_json_item\uff1f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9postgresql%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a22034-more_than_one_sql_json_item-gLMEPrgbkV\">\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a22034 &#8211; more_than_one_sql_json_item<\/h1>\n<p>\u5728\u4f7f\u7528PostgreSQL\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa4\u4ee3\u78bc22034\uff0c\u8a72\u932f\u8aa4\u901a\u5e38\u986f\u793a\u70ba\u201cmore_than_one_sql_json_item\u201d\u3002\u9019\u500b\u932f\u8aa4\u4e3b\u8981\u51fa\u73fe\u5728\u4f7f\u7528JSON\u6216JSONB\u6578\u64da\u985e\u578b\u6642\uff0c\u7576\u67e5\u8a62\u8fd4\u56de\u591a\u500bJSON\u9805\u76ee\u800c\u9810\u671f\u50c5\u8fd4\u56de\u4e00\u500b\u6642\uff0c\u5c31\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u8a72\u932f\u8aa4\u7684\u6210\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e5%8e%9f%e5%9b%a0%e5%88%86%e6%9e%90-gLMEPrgbkV\">\u932f\u8aa4\u539f\u56e0\u5206\u6790<\/h2>\n<p>PostgreSQL\u7684JSON\u548cJSONB\u6578\u64da\u985e\u578b\u5141\u8a31\u7528\u6236\u5b58\u5132\u548c\u67e5\u8a62\u7d50\u69cb\u5316\u6578\u64da\u3002\u7576\u4f7f\u7528\u9019\u4e9b\u6578\u64da\u985e\u578b\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u4f7f\u7528\u4e00\u4e9b\u51fd\u6578\u4f86\u63d0\u53d6\u6578\u64da\uff0c\u4f8b\u5982 <code>jsonb_array_elements<\/code> \u6216 <code>jsonb_each<\/code>\u3002\u5982\u679c\u9019\u4e9b\u51fd\u6578\u7684\u7d50\u679c\u8fd4\u56de\u591a\u65bc\u4e00\u500b\u9805\u76ee\uff0c\u800c\u67e5\u8a62\u7684\u4e0a\u4e0b\u6587\u537b\u671f\u671b\u50c5\u8fd4\u56de\u4e00\u500b\u9805\u76ee\uff0c\u5c31\u6703\u5c0e\u81f4\u932f\u8aa422034\u7684\u767c\u751f\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u8003\u616e\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT jsonb_array_elements(data) FROM my_table WHERE id = 1;<\/code><\/pre>\n<p>\u5982\u679c <code>data<\/code> \u5217\u5305\u542b\u4e00\u500bJSON\u6578\u7d44\uff0c\u4e26\u4e14\u8a72\u6578\u7d44\u6709\u591a\u500b\u5143\u7d20\uff0c\u5247\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u591a\u500b\u884c\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u5f8c\u7e8c\u7684\u67e5\u8a62\u6216\u64cd\u4f5c\u51fa\u73fe\u932f\u8aa4\u3002<\/p>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-gLMEPrgbkV\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u8981\u4fee\u5fa9\u932f\u8aa422034\uff0c\u958b\u767c\u8005\u9700\u8981\u78ba\u4fdd\u67e5\u8a62\u7684\u4e0a\u4e0b\u6587\u80fd\u5920\u6b63\u78ba\u8655\u7406\u591a\u500bJSON\u9805\u76ee\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u89e3\u6c7a\u65b9\u6848\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-gLMEPrgbkV\">1. \u4f7f\u7528\u805a\u5408\u51fd\u6578<\/h3>\n<p>\u5982\u679c\u60a8\u5e0c\u671b\u5c07\u591a\u500bJSON\u9805\u76ee\u5408\u4f75\u70ba\u4e00\u500b\u9805\u76ee\uff0c\u53ef\u4ee5\u4f7f\u7528\u805a\u5408\u51fd\u6578\uff0c\u4f8b\u5982 <code>jsonb_agg<\/code>\u3002\u9019\u6a23\u53ef\u4ee5\u5c07\u591a\u500b\u884c\u5408\u4f75\u70ba\u4e00\u500bJSON\u6578\u7d44\uff1a<\/p>\n<pre><code>SELECT jsonb_agg(jsonb_array_elements(data)) FROM my_table WHERE id = 1;<\/code><\/pre>\n<h3 id=\"2-%e9%99%90%e5%88%b6%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c-gLMEPrgbkV\">2. \u9650\u5236\u67e5\u8a62\u7d50\u679c<\/h3>\n<p>\u5982\u679c\u60a8\u53ea\u9700\u8981\u4e00\u500bJSON\u9805\u76ee\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>LIMIT<\/code> \u5b50\u53e5\u4f86\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u6578\u91cf\uff1a<\/p>\n<pre><code>SELECT jsonb_array_elements(data) FROM my_table WHERE id = 1 LIMIT 1;<\/code><\/pre>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b-gLMEPrgbkV\">3. \u6aa2\u67e5\u6578\u64da\u7d50\u69cb<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u6aa2\u67e5\u6578\u64da\u7d50\u69cb\u4ee5\u78ba\u4fdd\u5176\u7b26\u5408\u9810\u671f\u3002\u5982\u679c\u6578\u64da\u7d50\u69cb\u4e0d\u6b63\u78ba\uff0c\u5247\u53ef\u80fd\u9700\u8981\u9032\u884c\u6578\u64da\u6e05\u7406\u6216\u8f49\u63db\uff0c\u4ee5\u78ba\u4fdd\u67e5\u8a62\u80fd\u5920\u6b63\u78ba\u57f7\u884c\u3002<\/p>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%a1%88%e4%be%8b-gLMEPrgbkV\">\u5be6\u969b\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u60a8\u6709\u4e00\u500b\u540d\u70ba <code>orders<\/code> \u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b <code>items<\/code> \u5217\uff0c\u8a72\u5217\u5b58\u5132\u4e86\u6bcf\u500b\u8a02\u55ae\u7684\u5546\u54c1\u4fe1\u606f\uff0c\u683c\u5f0f\u70baJSON\u6578\u7d44\u3002\u7576\u60a8\u5617\u8a66\u63d0\u53d6\u7279\u5b9a\u8a02\u55ae\u7684\u5546\u54c1\u6642\uff0c\u53ef\u80fd\u6703\u9047\u5230\u932f\u8aa422034\uff1a<\/p>\n<pre><code>SELECT jsonb_array_elements(items) FROM orders WHERE order_id = 123;<\/code><\/pre>\n<p>\u5982\u679c\u8a72\u8a02\u55ae\u5305\u542b\u591a\u500b\u5546\u54c1\uff0c\u5247\u6703\u8fd4\u56de\u591a\u500b\u884c\uff0c\u5c0e\u81f4\u932f\u8aa4\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u805a\u5408\u51fd\u6578\u4f86\u89e3\u6c7a\u6b64\u554f\u984c\uff1a<\/p>\n<pre><code>SELECT jsonb_agg(jsonb_array_elements(items)) FROM orders WHERE order_id = 123;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gLMEPrgbkV\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL\u932f\u8aa4\u4ee3\u78bc22034 &#8211; \u201cmore_than_one_sql_json_item\u201d\u901a\u5e38\u662f\u7531\u65bc\u67e5\u8a62\u8fd4\u56de\u591a\u500bJSON\u9805\u76ee\u800c\u9810\u671f\u50c5\u8fd4\u56de\u4e00\u500b\u9805\u76ee\u6240\u5f15\u8d77\u7684\u3002\u901a\u904e\u4f7f\u7528\u805a\u5408\u51fd\u6578\u3001\u9650\u5236\u67e5\u8a62\u7d50\u679c\u6216\u6aa2\u67e5\u6578\u64da\u7d50\u69cb\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\u4ee5\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc22034 &#8211; more_than_one_sql_json_item\uff0c\u89e3\u6c7aSQL JSON\u67e5\u8a62\u4e2d\u7684\u591a\u91cd\u9805\u76ee\u554f\u984c\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-178772","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178772","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=178772"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178772\/revisions"}],"predecessor-version":[{"id":178773,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178772\/revisions\/178773"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=178772"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=178772"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=178772"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}