{"id":179006,"date":"2024-11-08T22:13:21","date_gmt":"2024-11-08T14:13:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179006\/"},"modified":"2024-11-08T22:13:21","modified_gmt":"2024-11-08T14:13:21","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a42804-datatype_mismatch%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179006\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42804 &#8211; datatype_mismatch\uff1f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a42804-datatype_mismatch-LJShfheZFV\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a42804 &#8211; datatype_mismatch<\/h1>\n<p>\u5728\u4f7f\u7528 PostgreSQL \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\u78bc 42804\uff0c\u9019\u901a\u5e38\u8868\u793a\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\uff08datatype_mismatch\uff09\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u3001\u5982\u4f55\u8b58\u5225\u5b83\u4ee5\u53ca\u4fee\u5fa9\u7684\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-42804-%e7%9a%84%e5%8e%9f%e5%9b%a0-LJShfheZFV\">\u932f\u8aa4\u4ee3\u78bc 42804 \u7684\u539f\u56e0<\/h2>\n<p>PostgreSQL \u7684\u932f\u8aa4\u4ee3\u78bc 42804 \u901a\u5e38\u51fa\u73fe\u5728\u4ee5\u4e0b\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u5728 SQL \u67e5\u8a62\u4e2d\uff0c\u5617\u8a66\u5c07\u4e00\u7a2e\u6578\u64da\u985e\u578b\u7684\u503c\u8ce6\u7d66\u53e6\u4e00\u7a2e\u4e0d\u517c\u5bb9\u7684\u6578\u64da\u985e\u578b\u3002<\/li>\n<li>\u5728\u51fd\u6578\u6216\u64cd\u4f5c\u4e2d\uff0c\u50b3\u905e\u4e86\u4e0d\u6b63\u78ba\u7684\u53c3\u6578\u985e\u578b\u3002<\/li>\n<li>\u5728\u8868\u7684\u5217\u4e2d\uff0c\u63d2\u5165\u7684\u6578\u64da\u985e\u578b\u8207\u5217\u5b9a\u7fa9\u4e0d\u5339\u914d\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u8868\u683c\u5b9a\u7fa9\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id SERIAL PRIMARY KEY,\n    name VARCHAR(100),\n    age INT\n);<\/code><\/pre>\n<p>\u5982\u679c\u4f60\u5617\u8a66\u57f7\u884c\u4ee5\u4e0b\u63d2\u5165\u8a9e\u53e5\uff1a<\/p>\n<pre><code>INSERT INTO users (name, age) VALUES ('Alice', 'twenty');<\/code><\/pre>\n<p>\u9019\u5c07\u5c0e\u81f4\u932f\u8aa4 42804\uff0c\u56e0\u70ba &#8216;twenty&#8217; \u662f\u4e00\u500b\u5b57\u7b26\u4e32\uff0c\u800c age \u5217\u671f\u671b\u7684\u662f\u4e00\u500b\u6574\u6578\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e8%ad%98%e5%88%a5%e9%8c%af%e8%aa%a4-LJShfheZFV\">\u5982\u4f55\u8b58\u5225\u932f\u8aa4<\/h2>\n<p>\u7576\u4f60\u9047\u5230\u932f\u8aa4 42804 \u6642\uff0cPostgreSQL \u901a\u5e38\u6703\u63d0\u4f9b\u4e00\u689d\u932f\u8aa4\u6d88\u606f\uff0c\u6307\u660e\u51fa\u932f\u7684 SQL \u8a9e\u53e5\u548c\u5177\u9ad4\u7684\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\u3002\u4ed4\u7d30\u6aa2\u67e5\u9019\u4e9b\u4fe1\u606f\u53ef\u4ee5\u5e6b\u52a9\u4f60\u5feb\u901f\u5b9a\u4f4d\u554f\u984c\u6240\u5728\u3002<\/p>\n<h2 id=\"%e4%bf%ae%e5%be%a9%e6%96%b9%e6%b3%95-LJShfheZFV\">\u4fee\u5fa9\u65b9\u6cd5<\/h2>\n<p>\u4fee\u5fa9\u932f\u8aa4 42804 \u7684\u65b9\u6cd5\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u60c5\u6cc1\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u89e3\u6c7a\u65b9\u6848\uff1a<\/p>\n<h3 id=\"1-%e7%a2%ba%e4%bf%9d%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b%e5%8c%b9%e9%85%8d-LJShfheZFV\">1. \u78ba\u4fdd\u6578\u64da\u985e\u578b\u5339\u914d<\/h3>\n<p>\u5728\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\u6642\uff0c\u78ba\u4fdd\u63d0\u4f9b\u7684\u6578\u64da\u985e\u578b\u8207\u8868\u4e2d\u5b9a\u7fa9\u7684\u6578\u64da\u985e\u578b\u76f8\u7b26\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u6574\u6578\u985e\u578b\u7684\u5217\uff0c\u8acb\u78ba\u4fdd\u63d2\u5165\u7684\u503c\u662f\u6574\u6578\uff1a<\/p>\n<pre><code>INSERT INTO users (name, age) VALUES ('Alice', 20);<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e9%a1%9e%e5%9e%8b%e8%bd%89%e6%8f%9b-LJShfheZFV\">2. \u4f7f\u7528\u985e\u578b\u8f49\u63db<\/h3>\n<p>\u5982\u679c\u4f60\u9700\u8981\u63d2\u5165\u7684\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\uff0c\u53ef\u4ee5\u4f7f\u7528 PostgreSQL \u7684\u985e\u578b\u8f49\u63db\u529f\u80fd\u3002\u4f8b\u5982\uff0c\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u6574\u6578\uff1a<\/p>\n<pre><code>INSERT INTO users (name, age) VALUES ('Alice', CAST('20' AS INT));<\/code><\/pre>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e5%87%bd%e6%95%b8%e5%8f%83%e6%95%b8-LJShfheZFV\">3. \u6aa2\u67e5\u51fd\u6578\u53c3\u6578<\/h3>\n<p>\u5982\u679c\u932f\u8aa4\u767c\u751f\u5728\u51fd\u6578\u8abf\u7528\u4e2d\uff0c\u8acb\u6aa2\u67e5\u51fd\u6578\u7684\u5b9a\u7fa9\uff0c\u78ba\u4fdd\u50b3\u905e\u7684\u53c3\u6578\u985e\u578b\u8207\u51fd\u6578\u671f\u671b\u7684\u985e\u578b\u76f8\u7b26\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>CREATE FUNCTION get_user_age(user_id INT) RETURNS INT AS $$\nBEGIN\n    RETURN (SELECT age FROM users WHERE id = user_id);\nEND;\n$$ LANGUAGE plpgsql;<\/code><\/pre>\n<p>\u5728\u8abf\u7528\u6b64\u51fd\u6578\u6642\uff0c\u78ba\u4fdd\u50b3\u905e\u7684\u53c3\u6578\u662f\u6574\u6578\uff1a<\/p>\n<pre><code>SELECT get_user_age(1);<\/code><\/pre>\n<h3 id=\"4-%e6%aa%a2%e6%9f%a5%e8%a1%a8%e7%b5%90%e6%a7%8b-LJShfheZFV\">4. \u6aa2\u67e5\u8868\u7d50\u69cb<\/h3>\n<p>\u5982\u679c\u4f60\u5728\u63d2\u5165\u6578\u64da\u6642\u9047\u5230\u554f\u984c\uff0c\u6aa2\u67e5\u8868\u7684\u7d50\u69cb\u4ee5\u78ba\u4fdd\u5217\u7684\u6578\u64da\u985e\u578b\u6b63\u78ba\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u67e5\u770b\u8868\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type FROM information_schema.columns WHERE table_name = 'users';<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-LJShfheZFV\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42804 &#8211; datatype_mismatch \u901a\u5e38\u662f\u7531\u65bc\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\u5f15\u8d77\u7684\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5 SQL \u8a9e\u53e5\u3001\u78ba\u4fdd\u6578\u64da\u985e\u578b\u4e00\u81f4\u6027\u4ee5\u53ca\u4f7f\u7528\u985e\u578b\u8f49\u63db\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u9019\u500b\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u6027\u548c\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 42804 &#8211; datatype_mismatch\uff0c\u89e3\u6c7a\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\u554f\u984c\uff0c\u78ba\u4fdd\u67e5\u8a62\u9806\u5229\u57f7\u884c\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-179006","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179006","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=179006"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179006\/revisions"}],"predecessor-version":[{"id":179007,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179006\/revisions\/179007"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179006"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179006"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179006"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}