{"id":177901,"date":"2024-11-08T16:30:24","date_gmt":"2024-11-08T08:30:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/177901\/"},"modified":"2024-11-08T16:30:25","modified_gmt":"2024-11-08T08:30:25","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41232-sqlstate-42000-er_wrong_type_for_var-%e8%ae%8a%e9%87%8fs%e7%9a%84%e5%8f%83%e6%95%b8%e9%a1%9e%e5%9e%8b%e4%b8%8d%e6%ad%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/177901\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41232 &#8211; SQLSTATE: 42000 (ER_WRONG_TYPE_FOR_VAR) \u8b8a\u91cf&#8217;%s&#8217;\u7684\u53c3\u6578\u985e\u578b\u4e0d\u6b63\u78ba"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mysql%e9%8c%af%e8%aa%a41232-sqlstate-42000-er_wrong_type_for_var-%e8%ae%8a%e9%87%8fs%e7%9a%84%e5%8f%83%e6%95%b8%e9%a1%9e%e5%9e%8b%e4%b8%8d%e6%ad%a3%e7%a2%ba-QFTDoOTSgI\">\u5982\u4f55\u4fee\u5fa9MySQL\u932f\u8aa41232 &#8211; SQLSTATE: 42000 (ER_WRONG_TYPE_FOR_VAR) \u8b8a\u91cf&#8217;%s&#8217;\u7684\u53c3\u6578\u985e\u578b\u4e0d\u6b63\u78ba<\/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\u78bc1232\uff0c\u8a72\u932f\u8aa4\u7684\u5177\u9ad4\u4fe1\u606f\u70ba\u201cSQLSTATE: 42000 (ER_WRONG_TYPE_FOR_VAR) \u8b8a\u91cf&#8217;%s&#8217;\u7684\u53c3\u6578\u985e\u578b\u4e0d\u6b63\u78ba\u201d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u57f7\u884c\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u6642\uff0c\u7576\u50b3\u905e\u7684\u53c3\u6578\u985e\u578b\u8207\u9810\u671f\u7684\u985e\u578b\u4e0d\u5339\u914d\u6642\uff0c\u5c31\u6703\u51fa\u73fe\u9019\u500b\u554f\u984c\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e5%8e%9f%e5%9b%a0%e5%88%86%e6%9e%90-QFTDoOTSgI\">\u932f\u8aa4\u539f\u56e0\u5206\u6790<\/h2>\n<p>MySQL\u4e2d\u7684\u5b58\u5132\u904e\u7a0b\u548c\u51fd\u6578\u5141\u8a31\u958b\u767c\u8005\u5b9a\u7fa9\u8f38\u5165\u548c\u8f38\u51fa\u53c3\u6578\u3002\u6bcf\u500b\u53c3\u6578\u90fd\u6709\u5176\u7279\u5b9a\u7684\u6578\u64da\u985e\u578b\uff0c\u4f8b\u5982\u6574\u6578\u3001\u5b57\u7b26\u4e32\u6216\u65e5\u671f\u7b49\u3002\u5982\u679c\u5728\u8abf\u7528\u9019\u4e9b\u904e\u7a0b\u6216\u51fd\u6578\u6642\uff0c\u50b3\u905e\u7684\u53c3\u6578\u985e\u578b\u8207\u5b9a\u7fa9\u7684\u985e\u578b\u4e0d\u4e00\u81f4\uff0c\u5c31\u6703\u5c0e\u81f4\u932f\u8aa41232\u7684\u767c\u751f\u3002<\/p>\n<ul>\n<li><strong>\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\uff1a<\/strong>\u4f8b\u5982\uff0c\u82e5\u5b58\u5132\u904e\u7a0b\u5b9a\u7fa9\u4e86\u4e00\u500b\u6574\u6578\u985e\u578b\u7684\u53c3\u6578\uff0c\u4f46\u5728\u8abf\u7528\u6642\u537b\u50b3\u905e\u4e86\u4e00\u500b\u5b57\u7b26\u4e32\uff0c\u5247\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002<\/li>\n<li><strong>NULL\u503c\u554f\u984c\uff1a<\/strong>\u5982\u679c\u5b58\u5132\u904e\u7a0b\u7684\u53c3\u6578\u4e0d\u5141\u8a31NULL\u503c\uff0c\u4f46\u8abf\u7528\u6642\u537b\u50b3\u905e\u4e86NULL\uff0c\u4e5f\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li><strong>\u53c3\u6578\u9806\u5e8f\u932f\u8aa4\uff1a<\/strong>\u5728\u8abf\u7528\u5b58\u5132\u904e\u7a0b\u6642\uff0c\u82e5\u53c3\u6578\u7684\u9806\u5e8f\u4e0d\u6b63\u78ba\uff0c\u4e5f\u53ef\u80fd\u5c0e\u81f4\u985e\u578b\u4e0d\u5339\u914d\u7684\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%a41232-QFTDoOTSgI\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa41232<\/h2>\n<p>\u4fee\u5fa9MySQL\u932f\u8aa41232\u7684\u904e\u7a0b\u901a\u5e38\u6d89\u53ca\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e6%88%96%e5%87%bd%e6%95%b8%e7%9a%84%e5%ae%9a%e7%be%a9-QFTDoOTSgI\">1. \u6aa2\u67e5\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u7684\u5b9a\u7fa9<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u7684\u5b9a\u7fa9\uff0c\u78ba\u4fdd\u6bcf\u500b\u53c3\u6578\u7684\u6578\u64da\u985e\u578b\u6b63\u78ba\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>\nCREATE PROCEDURE example_procedure(IN param1 INT, IN param2 VARCHAR(50))\nBEGIN\n    -- \u4f60\u7684\u908f\u8f2f\nEND;\n<\/code><\/pre>\n<h3 id=\"2-%e7%a2%ba%e8%aa%8d%e8%aa%bf%e7%94%a8%e6%99%82%e7%9a%84%e5%8f%83%e6%95%b8%e9%a1%9e%e5%9e%8b-QFTDoOTSgI\">2. \u78ba\u8a8d\u8abf\u7528\u6642\u7684\u53c3\u6578\u985e\u578b<\/h3>\n<p>\u5728\u8abf\u7528\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u6642\uff0c\u78ba\u4fdd\u50b3\u905e\u7684\u53c3\u6578\u985e\u578b\u8207\u5b9a\u7fa9\u4e00\u81f4\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>\nCALL example_procedure(123, '\u6e2c\u8a66');\n<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8cast%e6%88%96convert%e5%87%bd%e6%95%b8-QFTDoOTSgI\">3. \u4f7f\u7528CAST\u6216CONVERT\u51fd\u6578<\/h3>\n<p>\u5982\u679c\u9700\u8981\u5c07\u4e00\u500b\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u500b\u985e\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528CAST\u6216CONVERT\u51fd\u6578\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>\nCALL example_procedure(CAST('123' AS UNSIGNED), '\u6e2c\u8a66');\n<\/code><\/pre>\n<h3 id=\"4-%e6%aa%a2%e6%9f%a5null%e5%80%bc%e7%9a%84%e8%99%95%e7%90%86-QFTDoOTSgI\">4. \u6aa2\u67e5NULL\u503c\u7684\u8655\u7406<\/h3>\n<p>\u5982\u679c\u5b58\u5132\u904e\u7a0b\u7684\u53c3\u6578\u4e0d\u5141\u8a31NULL\uff0c\u8acb\u78ba\u4fdd\u5728\u8abf\u7528\u6642\u4e0d\u50b3\u905eNULL\u503c\u3002\u5982\u679c\u9700\u8981\u8655\u7406NULL\uff0c\u5247\u53ef\u4ee5\u8003\u616e\u4fee\u6539\u5b58\u5132\u904e\u7a0b\u7684\u5b9a\u7fa9\u4ee5\u5141\u8a31NULL\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b-QFTDoOTSgI\">\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u6b63\u78ba\u5b9a\u7fa9\u548c\u8abf\u7528\u5b58\u5132\u904e\u7a0b\uff1a<\/p>\n<pre><code>\nCREATE PROCEDURE add_numbers(IN num1 INT, IN num2 INT, OUT result INT)\nBEGIN\n    SET result = num1 + num2;\nEND;\n\n-- \u6b63\u78ba\u8abf\u7528\nSET @result = 0;\nCALL add_numbers(10, 20, @result);\nSELECT @result;  -- \u8f38\u51fa 30\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-QFTDoOTSgI\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u932f\u8aa41232\u901a\u5e38\u662f\u7531\u65bc\u53c3\u6578\u985e\u578b\u4e0d\u5339\u914d\u5f15\u8d77\u7684\u3002\u901a\u904e\u4ed4\u7d30\u6aa2\u67e5\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u7684\u5b9a\u7fa9\u3001\u78ba\u4fdd\u8abf\u7528\u6642\u7684\u53c3\u6578\u985e\u578b\u6b63\u78ba\u3001\u4f7f\u7528CAST\u6216CONVERT\u51fd\u6578\u9032\u884c\u985e\u578b\u8f49\u63db\uff0c\u4ee5\u53ca\u59a5\u5584\u8655\u7406NULL\u503c\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u5c0d\u65bc\u9700\u8981\u7a69\u5b9a\u904b\u884c\u7684\u61c9\u7528\u7a0b\u5e8f\uff0c\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4fee\u5fa9MySQL\u932f\u8aa41232 (ER_WRONG_TYPE_FOR_VAR) \u7684\u65b9\u6cd5\uff0c\u89e3\u6c7a\u8b8a\u91cf&#8217;%s&#8217;\u7684\u53c3\u6578\u985e\u578b\u4e0d\u6b63\u78ba\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-177901","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177901","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=177901"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177901\/revisions"}],"predecessor-version":[{"id":177902,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/177901\/revisions\/177902"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=177901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=177901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=177901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}