{"id":96810,"date":"2024-10-20T12:33:18","date_gmt":"2024-10-20T04:33:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96810\/"},"modified":"2024-10-20T12:33:19","modified_gmt":"2024-10-20T04:33:19","slug":"postgresql-39p01-%e8%a7%b8%e7%99%bc%e5%99%a8%e5%8d%94%e8%ad%b0%e9%81%95%e5%8f%8d-%e6%8a%a5%e9%94%99-%e6%95%85%e9%9a%9c%e4%bf%ae%e5%a4%8d-%e8%bf%9c%e7%a8%8b%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96810\/","title":{"rendered":"PostgreSQL 39P01: \u89f8\u767c\u5668\u5354\u8b70\u9055\u53cd \u62a5\u9519 \u6545\u969c\u4fee\u590d \u8fdc\u7a0b\u5904\u7406"},"content":{"rendered":"<h1 id=\"postgresql-39p01-%e8%a7%b8%e7%99%bc%e5%99%a8%e5%8d%94%e8%ad%b0%e9%81%95%e5%8f%8d%e5%a0%b1%e9%8c%af%e6%95%85%e9%9a%9c%e4%bf%ae%e5%be%a9%e9%81%a0%e7%a8%8b%e8%99%95%e7%90%86-QlLHfLnUOO\">PostgreSQL 39P01: \u89f8\u767c\u5668\u5354\u8b70\u9055\u53cd\u5831\u932f\u6545\u969c\u4fee\u5fa9\u9060\u7a0b\u8655\u7406<\/h1>\n<p>\u5728\u4f7f\u7528 PostgreSQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662f 39P01 \u932f\u8aa4\uff0c\u9019\u901a\u5e38\u8207\u89f8\u767c\u5668\u7684\u5354\u8b70\u9055\u53cd\u6709\u95dc\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e00\u932f\u8aa4\u7684\u6210\u56e0\u3001\u5f71\u97ff\u53ca\u5176\u4fee\u5fa9\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u9060\u7a0b\u8655\u7406\u7684\u5efa\u8b70\u3002<\/p>\n<h2 id=\"39p01-%e9%8c%af%e8%aa%a4%e6%a6%82%e8%bf%b0-QlLHfLnUOO\">39P01 \u932f\u8aa4\u6982\u8ff0<\/h2>\n<p>PostgreSQL \u7684 39P01 \u932f\u8aa4\u4ee3\u78bc\u8868\u793a\u300c\u89f8\u767c\u5668\u5354\u8b70\u9055\u53cd\u300d\u3002\u9019\u901a\u5e38\u767c\u751f\u5728\u89f8\u767c\u5668\u7684\u57f7\u884c\u904e\u7a0b\u4e2d\uff0c\u7576\u89f8\u767c\u5668\u7684\u884c\u70ba\u4e0d\u7b26\u5408\u9810\u671f\u7684\u5354\u8b70\u6642\uff0c\u6578\u64da\u5eab\u7cfb\u7d71\u6703\u5831\u544a\u6b64\u932f\u8aa4\u3002\u9019\u53ef\u80fd\u662f\u7531\u65bc\u89f8\u767c\u5668\u7684\u908f\u8f2f\u932f\u8aa4\u3001\u6578\u64da\u4e0d\u4e00\u81f4\u6216\u5176\u4ed6\u56e0\u7d20\u5f15\u8d77\u7684\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e6%88%90%e5%9b%a0-QlLHfLnUOO\">\u932f\u8aa4\u6210\u56e0<\/h2>\n<ul>\n<li><strong>\u89f8\u767c\u5668\u908f\u8f2f\u932f\u8aa4\uff1a<\/strong>\u5982\u679c\u89f8\u767c\u5668\u7684\u908f\u8f2f\u8a2d\u8a08\u4e0d\u7576\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u4e0d\u7b26\u5408\u5354\u8b70\u7684\u884c\u70ba\u3002\u4f8b\u5982\uff0c\u89f8\u767c\u5668\u53ef\u80fd\u8a66\u5716\u5728\u4e0d\u5141\u8a31\u7684\u60c5\u6cc1\u4e0b\u4fee\u6539\u6578\u64da\u3002<\/li>\n<li><strong>\u6578\u64da\u4e0d\u4e00\u81f4\uff1a<\/strong>\u7576\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u72c0\u614b\u8207\u89f8\u767c\u5668\u7684\u9810\u671f\u4e0d\u7b26\u6642\uff0c\u53ef\u80fd\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002\u4f8b\u5982\uff0c\u89f8\u767c\u5668\u53ef\u80fd\u4f9d\u8cf4\u65bc\u67d0\u4e9b\u6578\u64da\u7684\u5b58\u5728\uff0c\u4f46\u9019\u4e9b\u6578\u64da\u537b\u4e0d\u5b58\u5728\u3002<\/li>\n<li><strong>\u89f8\u767c\u5668\u7684\u57f7\u884c\u9806\u5e8f\uff1a<\/strong>\u5728\u591a\u500b\u89f8\u767c\u5668\u540c\u6642\u57f7\u884c\u6642\uff0c\u57f7\u884c\u9806\u5e8f\u53ef\u80fd\u6703\u5f71\u97ff\u6700\u7d42\u7d50\u679c\uff0c\u5c0e\u81f4\u5354\u8b70\u9055\u53cd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%95%85%e9%9a%9c%e4%bf%ae%e5%be%a9%e6%ad%a5%e9%a9%9f-QlLHfLnUOO\">\u6545\u969c\u4fee\u5fa9\u6b65\u9a5f<\/h2>\n<p>\u7576\u9047\u5230 39P01 \u932f\u8aa4\u6642\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9a5f\u9032\u884c\u6545\u969c\u6392\u9664\u548c\u4fee\u5fa9\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e8%a7%b8%e7%99%bc%e5%99%a8%e9%82%8f%e8%bc%af-QlLHfLnUOO\">1. \u6aa2\u67e5\u89f8\u767c\u5668\u908f\u8f2f<\/h3>\n<pre><code>CREATE OR REPLACE FUNCTION my_trigger_function()\nRETURNS TRIGGER AS $$\nBEGIN\n    -- \u89f8\u767c\u5668\u908f\u8f2f\n    IF NEW.value &lt; 0 THEN\n        RAISE EXCEPTION &#039;Value cannot be negative&#039;;\n    END IF;\n    RETURN NEW;\nEND;\n$$ LANGUAGE plpgsql;<\/code><\/pre>\n<p>\u78ba\u4fdd\u89f8\u767c\u5668\u908f\u8f2f\u6b63\u78ba\uff0c\u4e26\u4e14\u4e0d\u6703\u5728\u4e0d\u61c9\u8a72\u7684\u60c5\u6cc1\u4e0b\u5f15\u767c\u7570\u5e38\u3002<\/p>\n<h3 id=\"2-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e4%b8%80%e8%87%b4%e6%80%a7-QlLHfLnUOO\">2. \u6aa2\u67e5\u6578\u64da\u4e00\u81f4\u6027<\/h3>\n<p>\u4f7f\u7528 SQL \u67e5\u8a62\u6aa2\u67e5\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u78ba\u4fdd\u89f8\u767c\u5668\u6240\u4f9d\u8cf4\u7684\u6578\u64da\u5b58\u5728\u4e14\u6b63\u78ba\u3002<\/p>\n<pre><code>SELECT * FROM my_table WHERE condition;<\/code><\/pre>\n<h3 id=\"3-%e8%aa%bf%e6%95%b4%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e5%9f%b7%e8%a1%8c%e9%a0%86%e5%ba%8f-QlLHfLnUOO\">3. \u8abf\u6574\u89f8\u767c\u5668\u7684\u57f7\u884c\u9806\u5e8f<\/h3>\n<p>\u5982\u679c\u6709\u591a\u500b\u89f8\u767c\u5668\uff0c\u6aa2\u67e5\u5b83\u5011\u7684\u57f7\u884c\u9806\u5e8f\uff0c\u78ba\u4fdd\u4e0d\u6703\u56e0\u70ba\u57f7\u884c\u9806\u5e8f\u4e0d\u7576\u800c\u5c0e\u81f4\u5354\u8b70\u9055\u53cd\u3002<\/p>\n<h2 id=\"%e9%81%a0%e7%a8%8b%e8%99%95%e7%90%86%e5%bb%ba%e8%ad%b0-QlLHfLnUOO\">\u9060\u7a0b\u8655\u7406\u5efa\u8b70<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u958b\u767c\u8005\u53ef\u80fd\u9700\u8981\u9060\u7a0b\u8655\u7406 PostgreSQL \u6578\u64da\u5eab\u4e2d\u7684 39P01 \u932f\u8aa4\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u9060\u7a0b\u9023\u63a5\u5de5\u5177\uff1a<\/strong>\u5982 pgAdmin \u6216 DBeaver\uff0c\u9019\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u9060\u7a0b\u9023\u63a5\u5230\u6578\u64da\u5eab\u4e26\u9032\u884c\u6545\u969c\u6392\u9664\u3002<\/li>\n<li><strong>\u65e5\u8a8c\u6a94\u6848\u5206\u6790\uff1a<\/strong>\u6aa2\u67e5 PostgreSQL \u7684\u65e5\u8a8c\u6a94\u6848\uff0c\u5c0b\u627e\u8207 39P01 \u932f\u8aa4\u76f8\u95dc\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u4ee5\u4fbf\u66f4\u597d\u5730\u7406\u89e3\u554f\u984c\u7684\u6839\u6e90\u3002<\/li>\n<li><strong>\u7248\u672c\u63a7\u5236\uff1a<\/strong>\u78ba\u4fdd\u4f7f\u7528\u7684 PostgreSQL \u7248\u672c\u662f\u6700\u65b0\u7684\uff0c\u56e0\u70ba\u67d0\u4e9b\u932f\u8aa4\u53ef\u80fd\u5728\u65b0\u7248\u672c\u4e2d\u5df2\u88ab\u4fee\u5fa9\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-QlLHfLnUOO\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u7684 39P01 \u932f\u8aa4\u662f\u7531\u65bc\u89f8\u767c\u5668\u5354\u8b70\u9055\u53cd\u5f15\u8d77\u7684\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u6578\u64da\u5eab\u7684\u6b63\u5e38\u904b\u884c\u3002\u901a\u904e\u6aa2\u67e5\u89f8\u767c\u5668\u908f\u8f2f\u3001\u6578\u64da\u4e00\u81f4\u6027\u548c\u57f7\u884c\u9806\u5e8f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u6b64\u5916\uff0c\u4f7f\u7528\u9060\u7a0b\u9023\u63a5\u5de5\u5177\u548c\u5206\u6790\u65e5\u8a8c\u6a94\u6848\u4e5f\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u5feb\u901f\u5b9a\u4f4d\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3PostgreSQL 39P01\u9519\u8bef\uff1a\u89e6\u53d1\u5668\u534f\u8bae\u8fdd\u53cd\u7684\u539f\u56e0\u53ca\u6545\u969c\u4fee\u590d\u65b9\u6cd5\uff0c\u63d0\u5347\u8fdc\u7a0b\u5904\u7406\u6548\u7387\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-96810","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96810","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=96810"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96810\/revisions"}],"predecessor-version":[{"id":96811,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96810\/revisions\/96811"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96810"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96810"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96810"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}