{"id":178774,"date":"2024-11-08T20:47:18","date_gmt":"2024-11-08T12:47:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/178774\/"},"modified":"2024-11-08T20:47:19","modified_gmt":"2024-11-08T12:47:19","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%9a22035-no_sql_json_item%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/178774\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a22035 &#8211; no_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%9a22035-no_sql_json_item-NHgvfvkeov\">\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a22035 &#8211; no_sql_json_item<\/h1>\n<p>\u5728\u4f7f\u7528PostgreSQL\u6578\u64da\u5eab\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\u78bc22035\uff0c\u8a72\u932f\u8aa4\u901a\u5e38\u986f\u793a\u70ba\u201cno_sql_json_item\u201d\u3002\u9019\u500b\u932f\u8aa4\u4e3b\u8981\u8207JSON\u6578\u64da\u985e\u578b\u7684\u8655\u7406\u6709\u95dc\uff0c\u7279\u5225\u662f\u5728\u5617\u8a66\u5f9eJSON\u6216JSONB\u6578\u64da\u4e2d\u63d0\u53d6\u503c\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\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-NHgvfvkeov\">\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\u7136\u800c\uff0c\u7576\u7528\u6236\u5617\u8a66\u5f9e\u9019\u4e9b\u6578\u64da\u985e\u578b\u4e2d\u63d0\u53d6\u4e0d\u5b58\u5728\u7684\u9375\u6216\u503c\u6642\uff0c\u5c31\u6703\u51fa\u73fe22035\u932f\u8aa4\u3002\u9019\u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u4e0d\u6b63\u78ba\u7684\u9375\u540d\u3002<\/li>\n<li>JSON\u6578\u64da\u7d50\u69cb\u4e0d\u7b26\u5408\u9810\u671f\uff0c\u5c0e\u81f4\u7121\u6cd5\u627e\u5230\u6240\u9700\u7684\u9805\u76ee\u3002<\/li>\n<li>\u4f7f\u7528\u4e86\u4e0d\u6b63\u78ba\u7684JSON\u51fd\u6578\u6216\u64cd\u4f5c\u7b26\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e5%a0%b4%e6%99%af-NHgvfvkeov\">\u5e38\u898b\u5834\u666f<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u53ef\u80fd\u5c0e\u81f422035\u932f\u8aa4\u7684\u5e38\u898b\u5834\u666f\uff1a<\/p>\n<h3 id=\"1-%e9%8c%af%e8%aa%a4%e7%9a%84%e9%8d%b5%e5%90%8d-NHgvfvkeov\">1. \u932f\u8aa4\u7684\u9375\u540d<\/h3>\n<pre><code>SELECT data-&gt;'non_existent_key' FROM my_table;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u5982\u679c\u201cdata\u201d\u5b57\u6bb5\u7684JSON\u5c0d\u8c61\u4e2d\u4e0d\u5b58\u5728\u201cnon_existent_key\u201d\uff0c\u5247\u6703\u5f15\u767c22035\u932f\u8aa4\u3002<\/p>\n<h3 id=\"2-%e4%b8%8d%e6%ad%a3%e7%a2%ba%e7%9a%84json%e7%b5%90%e6%a7%8b-NHgvfvkeov\">2. \u4e0d\u6b63\u78ba\u7684JSON\u7d50\u69cb<\/h3>\n<pre><code>SELECT jsonb_array_elements(data-&gt;'array_key') FROM my_table;<\/code><\/pre>\n<p>\u5982\u679c\u201carray_key\u201d\u4e0d\u662f\u4e00\u500b\u6578\u7d44\uff0c\u5247\u6703\u5c0e\u81f4\u932f\u8aa4\u3002\u78ba\u4fdd\u5728\u67e5\u8a62\u4e4b\u524d\u6aa2\u67e5\u6578\u64da\u7d50\u69cb\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e4%b8%8d%e6%ad%a3%e7%a2%ba%e7%9a%84%e5%87%bd%e6%95%b8-NHgvfvkeov\">3. \u4f7f\u7528\u4e0d\u6b63\u78ba\u7684\u51fd\u6578<\/h3>\n<pre><code>SELECT jsonb_extract_path(data, 'key1', 'key2') FROM my_table;<\/code><\/pre>\n<p>\u5982\u679c\u201ckey1\u201d\u5b58\u5728\u4f46\u201ckey2\u201d\u4e0d\u5b58\u5728\uff0c\u5247\u6703\u5f15\u767c22035\u932f\u8aa4\u3002\u4f7f\u7528\u524d\u61c9\u78ba\u8a8d\u6240\u6709\u9375\u7684\u5b58\u5728\u6027\u3002<\/p>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-NHgvfvkeov\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u8981\u4fee\u5fa9PostgreSQL\u768422035\u932f\u8aa4\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e9%8d%b5%e5%90%8d-NHgvfvkeov\">1. \u6aa2\u67e5\u9375\u540d<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u9375\u540d\u662f\u5426\u6b63\u78ba\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u67e5\u770bJSON\u6578\u64da\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT jsonb_pretty(data) FROM my_table LIMIT 1;<\/code><\/pre>\n<h3 id=\"2-%e9%a9%97%e8%ad%89%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b-NHgvfvkeov\">2. \u9a57\u8b49\u6578\u64da\u7d50\u69cb<\/h3>\n<p>\u5728\u57f7\u884c\u67e5\u8a62\u4e4b\u524d\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u7d50\u69cb\u7b26\u5408\u9810\u671f\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u67e5\u7279\u5b9a\u9375\u7684\u985e\u578b\uff1a<\/p>\n<pre><code>SELECT jsonb_typeof(data-&gt;'key') FROM my_table;<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-NHgvfvkeov\">3. \u4f7f\u7528\u689d\u4ef6\u67e5\u8a62<\/h3>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u689d\u4ef6\u4f86\u907f\u514d\u5c0d\u4e0d\u5b58\u5728\u7684\u9375\u9032\u884c\u64cd\u4f5c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT CASE WHEN data ? 'key' THEN data-&gt;'key' ELSE NULL END FROM my_table;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-NHgvfvkeov\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL\u932f\u8aa4\u4ee3\u78bc22035 &#8211; no_sql_json_item\u901a\u5e38\u662f\u7531\u65bc\u5c0dJSON\u6578\u64da\u7684\u932f\u8aa4\u64cd\u4f5c\u5f15\u8d77\u7684\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5\u9375\u540d\u3001\u9a57\u8b49\u6578\u64da\u7d50\u69cb\u4ee5\u53ca\u4f7f\u7528\u689d\u4ef6\u67e5\u8a62\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u548c\u4fee\u5fa9\u9019\u4e00\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\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc22035 &#8211; no_sql_json_item\uff0c\u89e3\u6c7aJSON\u6578\u64da\u8655\u7406\u4e2d\u7684\u5e38\u898b\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-178774","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178774","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=178774"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178774\/revisions"}],"predecessor-version":[{"id":178775,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178774\/revisions\/178775"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=178774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=178774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=178774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}