{"id":178468,"date":"2024-11-08T18:13:18","date_gmt":"2024-11-08T10:13:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/178468\/"},"modified":"2024-11-08T18:13:19","modified_gmt":"2024-11-08T10:13:19","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41338-sqlstate-20000-er_sp_case_not_found-case%e8%aa%9e%e5%8f%a5%e6%b2%92%e6%9c%89%e6%89%be%e5%88%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/178468\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41338 &#8211; SQLSTATE: 20000 (ER_SP_CASE_NOT_FOUND) CASE\u8a9e\u53e5\u6c92\u6709\u627e\u5230"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41338-sqlstate-20000-er_sp_case_not_found-case%e8%aa%9e%e5%8f%a5%e6%b2%92%e6%9c%89%e6%89%be%e5%88%b0-wesKFwhhcJ\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41338 &#8211; SQLSTATE: 20000 (ER_SP_CASE_NOT_FOUND) CASE\u8a9e\u53e5\u6c92\u6709\u627e\u5230<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa4\u4ee3\u78bc1338\uff0c\u8a72\u932f\u8aa4\u901a\u5e38\u8207CASE\u8a9e\u53e5\u7684\u4f7f\u7528\u6709\u95dc\u3002\u7576\u4f60\u5728\u57f7\u884cSQL\u67e5\u8a62\u6642\uff0c\u82e5\u51fa\u73fe\u201cSQLSTATE: 20000 (ER_SP_CASE_NOT_FOUND) CASE\u8a9e\u53e5\u6c92\u6709\u627e\u5230\u201d\u7684\u932f\u8aa4\uff0c\u9019\u610f\u5473\u8457MySQL\u7121\u6cd5\u627e\u5230\u76f8\u61c9\u7684CASE\u8a9e\u53e5\uff0c\u5c0e\u81f4\u67e5\u8a62\u7121\u6cd5\u6b63\u5e38\u57f7\u884c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6b64\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-wesKFwhhcJ\">\u932f\u8aa4\u539f\u56e0\u5206\u6790<\/h2>\n<p>MySQL\u7684CASE\u8a9e\u53e5\u662f\u4e00\u7a2e\u689d\u4ef6\u8868\u9054\u5f0f\uff0c\u5141\u8a31\u6839\u64da\u4e0d\u540c\u7684\u689d\u4ef6\u8fd4\u56de\u4e0d\u540c\u7684\u503c\u3002\u7576\u4f60\u5728\u5b58\u5132\u904e\u7a0b\u6216\u89f8\u767c\u5668\u4e2d\u4f7f\u7528CASE\u8a9e\u53e5\u6642\uff0c\u82e5\u51fa\u73fe\u932f\u8aa41338\uff0c\u53ef\u80fd\u662f\u7531\u65bc\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\uff1a<\/p>\n<ul>\n<li><strong>CASE\u8a9e\u53e5\u7684\u8a9e\u6cd5\u932f\u8aa4\uff1a<\/strong>\u5982\u679cCASE\u8a9e\u53e5\u7684\u8a9e\u6cd5\u4e0d\u6b63\u78ba\uff0cMySQL\u5c07\u7121\u6cd5\u89e3\u6790\u8a72\u8a9e\u53e5\uff0c\u5f9e\u800c\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li><strong>\u672a\u6b63\u78ba\u5b9a\u7fa9\u7684\u8b8a\u91cf\uff1a<\/strong>\u5728\u4f7f\u7528CASE\u8a9e\u53e5\u6642\uff0c\u5982\u679c\u5f15\u7528\u4e86\u672a\u5b9a\u7fa9\u6216\u932f\u8aa4\u7684\u8b8a\u91cf\uff0c\u4e5f\u6703\u5c0e\u81f4\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>\u5b58\u5132\u904e\u7a0b\u6216\u89f8\u767c\u5668\u7684\u4e0a\u4e0b\u6587\u554f\u984c\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5b58\u5132\u904e\u7a0b\u6216\u89f8\u767c\u5668\u7684\u4e0a\u4e0b\u6587\u53ef\u80fd\u6703\u5f71\u97ffCASE\u8a9e\u53e5\u7684\u57f7\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-wesKFwhhcJ\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u8981\u4fee\u5fa9MySQL\u932f\u8aa41338\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5case%e8%aa%9e%e5%8f%a5%e7%9a%84%e8%aa%9e%e6%b3%95-wesKFwhhcJ\">1. \u6aa2\u67e5CASE\u8a9e\u53e5\u7684\u8a9e\u6cd5<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5\u4f60\u7684CASE\u8a9e\u53e5\u662f\u5426\u7b26\u5408\u6b63\u78ba\u7684\u8a9e\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u6b63\u78ba\u7684CASE\u8a9e\u53e5\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT \n    CASE \n        WHEN condition1 THEN result1\n        WHEN condition2 THEN result2\n        ELSE default_result\n    END AS alias_name\nFROM table_name;<\/code><\/pre>\n<p>\u78ba\u4fdd\u6240\u6709\u7684\u689d\u4ef6\u548c\u7d50\u679c\u90fd\u6b63\u78ba\u7121\u8aa4\uff0c\u4e26\u4e14\u4f7f\u7528\u4e86\u6b63\u78ba\u7684\u95dc\u9375\u5b57\u3002<\/p>\n<h3 id=\"2-%e7%a2%ba%e8%aa%8d%e8%ae%8a%e9%87%8f%e7%9a%84%e5%ae%9a%e7%be%a9-wesKFwhhcJ\">2. \u78ba\u8a8d\u8b8a\u91cf\u7684\u5b9a\u7fa9<\/h3>\n<p>\u6aa2\u67e5\u5728CASE\u8a9e\u53e5\u4e2d\u4f7f\u7528\u7684\u6240\u6709\u8b8a\u91cf\u662f\u5426\u5df2\u6b63\u78ba\u5b9a\u7fa9\u4e26\u521d\u59cb\u5316\u3002\u5982\u679c\u8b8a\u91cf\u672a\u5b9a\u7fa9\uff0c\u5247\u9700\u8981\u5728\u4f7f\u7528\u4e4b\u524d\u9032\u884c\u5b9a\u7fa9\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SET @my_variable = 'some_value';<\/code><\/pre>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e6%88%96%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e4%b8%8a%e4%b8%8b%e6%96%87-wesKFwhhcJ\">3. \u6aa2\u67e5\u5b58\u5132\u904e\u7a0b\u6216\u89f8\u767c\u5668\u7684\u4e0a\u4e0b\u6587<\/h3>\n<p>\u5982\u679cCASE\u8a9e\u53e5\u662f\u5728\u5b58\u5132\u904e\u7a0b\u6216\u89f8\u767c\u5668\u4e2d\u4f7f\u7528\uff0c\u8acb\u6aa2\u67e5\u4e0a\u4e0b\u6587\u662f\u5426\u6b63\u78ba\u3002\u78ba\u4fdd\u5728\u57f7\u884cCASE\u8a9e\u53e5\u6642\uff0c\u6240\u6709\u5fc5\u8981\u7684\u8b8a\u91cf\u548c\u53c3\u6578\u90fd\u5df2\u6b63\u78ba\u50b3\u905e\u3002<\/p>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e8%aa%bf%e8%a9%a6%e5%b7%a5%e5%85%b7-wesKFwhhcJ\">4. \u4f7f\u7528\u8abf\u8a66\u5de5\u5177<\/h3>\n<p>\u5982\u679c\u4ee5\u4e0a\u6b65\u9a5f\u7121\u6cd5\u89e3\u6c7a\u554f\u984c\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528MySQL\u7684\u8abf\u8a66\u5de5\u5177\u4f86\u8ddf\u8e2a\u57f7\u884c\u904e\u7a0b\uff0c\u627e\u51fa\u554f\u984c\u6240\u5728\u3002\u4f7f\u7528 <code>SHOW WARNINGS;<\/code> \u547d\u4ee4\u53ef\u4ee5\u67e5\u770b\u6700\u8fd1\u7684\u8b66\u544a\u4fe1\u606f\uff0c\u9019\u53ef\u80fd\u6709\u52a9\u65bc\u5b9a\u4f4d\u554f\u984c\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-wesKFwhhcJ\">\u7d50\u8ad6<\/h2>\n<p>MySQL\u932f\u8aa41338\u901a\u5e38\u662f\u7531\u65bcCASE\u8a9e\u53e5\u7684\u8a9e\u6cd5\u932f\u8aa4\u3001\u672a\u5b9a\u7fa9\u7684\u8b8a\u91cf\u6216\u4e0a\u4e0b\u6587\u554f\u984c\u5f15\u8d77\u7684\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5\u8a9e\u6cd5\u3001\u8b8a\u91cf\u5b9a\u7fa9\u548c\u4e0a\u4e0b\u6587\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u6b64\u554f\u984c\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\u4f60\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684\u6578\u64da\u5eab\u670d\u52d9\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u4f60\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4fee\u5fa9MySQL\u932f\u8aa41338 (ER_SP_CASE_NOT_FOUND) \u7684\u65b9\u6cd5\uff0c\u89e3\u6c7aCASE\u8a9e\u53e5\u672a\u627e\u5230\u7684\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u5eab\u67e5\u8a62\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-178468","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178468","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=178468"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178468\/revisions"}],"predecessor-version":[{"id":178469,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178468\/revisions\/178469"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=178468"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=178468"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=178468"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}