{"id":178716,"date":"2024-11-08T20:18:20","date_gmt":"2024-11-08T12:18:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/178716\/"},"modified":"2024-11-08T20:18:21","modified_gmt":"2024-11-08T12:18:21","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%9a22011-substring_error%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/178716\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a22011 &#8211; substring_error\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%9a22011-substring_error-LRXRYbxybA\">\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a22011 &#8211; substring_error<\/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\u78bc22011\uff0c\u901a\u5e38\u88ab\u7a31\u70basubstring_error\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u4f7f\u7528substring\u51fd\u6578\u6642\uff0c\u7576\u63d0\u4f9b\u7684\u53c3\u6578\u4e0d\u7b26\u5408\u8981\u6c42\u6642\uff0c\u7cfb\u7d71\u6703\u8fd4\u56de\u6b64\u932f\u8aa4\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%e4%bb%a3%e7%a2%bc22011%e7%9a%84%e5%8e%9f%e5%9b%a0-LRXRYbxybA\">\u932f\u8aa4\u4ee3\u78bc22011\u7684\u539f\u56e0<\/h2>\n<p>PostgreSQL\u7684substring\u51fd\u6578\u7528\u65bc\u5f9e\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\u3002\u7576\u4f7f\u7528\u6b64\u51fd\u6578\u6642\uff0c\u5fc5\u9808\u63d0\u4f9b\u6b63\u78ba\u7684\u53c3\u6578\uff0c\u5305\u62ec\u5b57\u7b26\u4e32\u3001\u8d77\u59cb\u4f4d\u7f6e\u548c\u53ef\u9078\u7684\u9577\u5ea6\u3002\u5982\u679c\u8d77\u59cb\u4f4d\u7f6e\u8d85\u51fa\u4e86\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\uff0c\u6216\u8005\u9577\u5ea6\u70ba\u8ca0\u6578\uff0c\u5247\u6703\u5f15\u767c22011\u932f\u8aa4\u3002<\/p>\n<h3 id=\"%e5%b8%b8%e8%a6%8b%e6%83%85%e6%b3%81-LRXRYbxybA\">\u5e38\u898b\u60c5\u6cc1<\/h3>\n<ul>\n<li><strong>\u8d77\u59cb\u4f4d\u7f6e\u8d85\u51fa\u7bc4\u570d\uff1a<\/strong>\u5982\u679c\u4f60\u5617\u8a66\u5f9e\u4e00\u500b\u5b57\u7b26\u4e32\u7684\u8d77\u59cb\u4f4d\u7f6e\u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\uff0c\u4f46\u8a72\u4f4d\u7f6e\u8d85\u51fa\u4e86\u5b57\u7b26\u4e32\u7684\u5be6\u969b\u9577\u5ea6\uff0c\u5247\u6703\u51fa\u73fe\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u8ca0\u9577\u5ea6\uff1a<\/strong>\u7576\u6307\u5b9a\u7684\u9577\u5ea6\u70ba\u8ca0\u6578\u6642\uff0cPostgreSQL\u7121\u6cd5\u6b63\u78ba\u8655\u7406\uff0c\u9019\u4e5f\u6703\u5c0e\u81f422011\u932f\u8aa4\u3002<\/li>\n<li><strong>\u7a7a\u5b57\u7b26\u4e32\uff1a<\/strong>\u5982\u679c\u5c0d\u7a7a\u5b57\u7b26\u4e32\u4f7f\u7528substring\u51fd\u6578\uff0c\u4e26\u4e14\u8d77\u59cb\u4f4d\u7f6e\u4e0d\u70ba1\uff0c\u5247\u4e5f\u53ef\u80fd\u5f15\u767c\u6b64\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a4-LRXRYbxybA\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa4<\/h2>\n<p>\u4fee\u5fa9PostgreSQL\u768422011\u932f\u8aa4\u901a\u5e38\u6d89\u53ca\u6aa2\u67e5\u548c\u8abf\u6574substring\u51fd\u6578\u7684\u53c3\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5177\u9ad4\u7684\u89e3\u6c7a\u65b9\u6848\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e8%b5%b7%e5%a7%8b%e4%bd%8d%e7%bd%ae-LRXRYbxybA\">1. \u6aa2\u67e5\u8d77\u59cb\u4f4d\u7f6e<\/h3>\n<p>\u78ba\u4fdd\u4f60\u63d0\u4f9b\u7684\u8d77\u59cb\u4f4d\u7f6e\u5728\u5b57\u7b26\u4e32\u7684\u6709\u6548\u7bc4\u570d\u5167\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\u4f86\u6aa2\u67e5\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\uff1a<\/p>\n<pre><code>SELECT LENGTH(your_column) FROM your_table;<\/code><\/pre>\n<p>\u7136\u5f8c\uff0c\u6839\u64da\u8fd4\u56de\u7684\u9577\u5ea6\u4f86\u8abf\u6574\u4f60\u7684substring\u51fd\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT SUBSTRING(your_column FROM 1 FOR 5) FROM your_table;<\/code><\/pre>\n<h3 id=\"2-%e7%a2%ba%e4%bf%9d%e9%95%b7%e5%ba%a6%e7%82%ba%e6%ad%a3%e6%95%b8-LRXRYbxybA\">2. \u78ba\u4fdd\u9577\u5ea6\u70ba\u6b63\u6578<\/h3>\n<p>\u5728\u4f7f\u7528substring\u51fd\u6578\u6642\uff0c\u78ba\u4fdd\u9577\u5ea6\u53c3\u6578\u70ba\u6b63\u6578\u3002\u5982\u679c\u9700\u8981\u63d0\u53d6\u6574\u500b\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u7701\u7565\u9577\u5ea6\u53c3\u6578\uff1a<\/p>\n<pre><code>SELECT SUBSTRING(your_column FROM 1) FROM your_table;<\/code><\/pre>\n<h3 id=\"3-%e8%99%95%e7%90%86%e7%a9%ba%e5%ad%97%e7%ac%a6%e4%b8%b2-LRXRYbxybA\">3. \u8655\u7406\u7a7a\u5b57\u7b26\u4e32<\/h3>\n<p>\u5728\u8655\u7406\u7a7a\u5b57\u7b26\u4e32\u6642\uff0c\u61c9\u8a72\u6aa2\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u70ba\u7a7a\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u689d\u4ef6\u8655\u7406\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT CASE \n    WHEN your_column IS NULL OR your_column = '' THEN '\u7a7a\u5b57\u7b26\u4e32' \n    ELSE SUBSTRING(your_column FROM 1 FOR 5) \nEND FROM your_table;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-LRXRYbxybA\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL\u7684\u932f\u8aa4\u4ee3\u78bc22011\u901a\u5e38\u662f\u7531\u65bcsubstring\u51fd\u6578\u7684\u53c3\u6578\u4e0d\u6b63\u78ba\u5f15\u8d77\u7684\u3002\u901a\u904e\u6aa2\u67e5\u8d77\u59cb\u4f4d\u7f6e\u3001\u78ba\u4fdd\u9577\u5ea6\u70ba\u6b63\u6578\u4ee5\u53ca\u8655\u7406\u7a7a\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u548c\u9ad8\u6548\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a>\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc22011 &#8211; substring_error\uff0c\u89e3\u6c7a\u5b57\u7b26\u4e32\u64cd\u4f5c\u4e2d\u7684\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\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-178716","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178716","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=178716"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178716\/revisions"}],"predecessor-version":[{"id":178717,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178716\/revisions\/178717"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=178716"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=178716"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=178716"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}