{"id":168551,"date":"2024-11-06T13:19:24","date_gmt":"2024-11-06T05:19:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168551\/"},"modified":"2024-11-06T13:19:24","modified_gmt":"2024-11-06T05:19:24","slug":"sql-%e4%b8%ad%e6%b8%b8%e6%a8%99%e7%9a%84%e8%aa%9e%e6%b3%95%e5%8f%8a%e6%87%89%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168551\/","title":{"rendered":"SQL \u4e2d\u6e38\u6a19\u7684\u8a9e\u6cd5\u53ca\u61c9\u7528"},"content":{"rendered":"<h1 id=\"sql-%e4%b8%ad%e6%b8%b8%e6%a8%99%e7%9a%84%e8%aa%9e%e6%b3%95%e5%8f%8a%e6%87%89%e7%94%a8-nfZokrmAWM\">SQL \u4e2d\u6e38\u6a19\u7684\u8a9e\u6cd5\u53ca\u61c9\u7528<\/h1>\n<p>\u5728 SQL \u4e2d\uff0c\u6e38\u6a19\u662f\u4e00\u7a2e\u7528\u65bc\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\u96c6\u7684\u6578\u64da\u7d50\u69cb\u3002\u6e38\u6a19\u5141\u8a31\u958b\u767c\u8005\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\u9010\u884c\u8a2a\u554f\u6578\u64da\uff0c\u9019\u5728\u9700\u8981\u5c0d\u6bcf\u4e00\u884c\u6578\u64da\u9032\u884c\u7279\u5b9a\u64cd\u4f5c\u6642\u975e\u5e38\u6709\u7528\u3002\u672c\u6587\u5c07\u63a2\u8a0e SQL \u4e2d\u6e38\u6a19\u7684\u57fa\u672c\u8a9e\u6cd5\u53ca\u5176\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e6%b8%b8%e6%a8%99%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-nfZokrmAWM\">\u6e38\u6a19\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6e38\u6a19\u53ef\u4ee5\u88ab\u8996\u70ba\u4e00\u500b\u6307\u5411\u67e5\u8a62\u7d50\u679c\u96c6\u7684\u6307\u91dd\u3002\u7576\u57f7\u884c\u4e00\u500b\u67e5\u8a62\u6642\uff0c\u7d50\u679c\u96c6\u6703\u88ab\u5275\u5efa\uff0c\u800c\u6e38\u6a19\u5247\u5141\u8a31\u7528\u6236\u9010\u884c\u8a2a\u554f\u9019\u4e9b\u6578\u64da\u3002\u6e38\u6a19\u7684\u4f7f\u7528\u901a\u5e38\u6d89\u53ca\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<ul>\n<li>\u5ba3\u544a\u6e38\u6a19<\/li>\n<li>\u6253\u958b\u6e38\u6a19<\/li>\n<li>\u63d0\u53d6\u6578\u64da<\/li>\n<li>\u95dc\u9589\u6e38\u6a19<\/li>\n<li>\u91cb\u653e\u6e38\u6a19<\/li>\n<\/ul>\n<h2 id=\"%e6%b8%b8%e6%a8%99%e7%9a%84%e8%aa%9e%e6%b3%95-nfZokrmAWM\">\u6e38\u6a19\u7684\u8a9e\u6cd5<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4f7f\u7528 SQL \u6e38\u6a19\u7684\u57fa\u672c\u8a9e\u6cd5\u793a\u4f8b\uff1a<\/p>\n<pre><code>DECLARE cursor_name CURSOR FOR\nSELECT column1, column2 FROM table_name WHERE condition;\n\nOPEN cursor_name;\n\nFETCH NEXT FROM cursor_name INTO @variable1, @variable2;\n\nCLOSE cursor_name;\n\nDEALLOCATE cursor_name;<\/code><\/pre>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e8%a9%b3%e8%a7%a3-nfZokrmAWM\">\u6b65\u9a5f\u8a73\u89e3<\/h3>\n<h4 id=\"1-%e5%ae%a3%e5%91%8a%e6%b8%b8%e6%a8%99-nfZokrmAWM\">1. \u5ba3\u544a\u6e38\u6a19<\/h4>\n<p>\u4f7f\u7528 <code>DECLARE<\/code> \u8a9e\u53e5\u4f86\u5ba3\u544a\u6e38\u6a19\uff0c\u4e26\u6307\u5b9a\u8981\u67e5\u8a62\u7684 SQL \u8a9e\u53e5\u3002<\/p>\n<h4 id=\"2-%e6%89%93%e9%96%8b%e6%b8%b8%e6%a8%99-nfZokrmAWM\">2. \u6253\u958b\u6e38\u6a19<\/h4>\n<p>\u4f7f\u7528 <code>OPEN<\/code> \u8a9e\u53e5\u4f86\u6253\u958b\u6e38\u6a19\uff0c\u9019\u6a23\u5c31\u53ef\u4ee5\u958b\u59cb\u5f9e\u7d50\u679c\u96c6\u4e2d\u63d0\u53d6\u6578\u64da\u3002<\/p>\n<h4 id=\"3-%e6%8f%90%e5%8f%96%e6%95%b8%e6%93%9a-nfZokrmAWM\">3. \u63d0\u53d6\u6578\u64da<\/h4>\n<p>\u4f7f\u7528 <code>FETCH<\/code> \u8a9e\u53e5\u4f86\u63d0\u53d6\u6578\u64da\u3002\u53ef\u4ee5\u4f7f\u7528 <code>FETCH NEXT<\/code>\u3001<code>FETCH PRIOR<\/code>\u3001<code>FETCH FIRST<\/code> \u6216 <code>FETCH LAST<\/code> \u4f86\u63a7\u5236\u63d0\u53d6\u7684\u884c\u3002<\/p>\n<h4 id=\"4-%e9%97%9c%e9%96%89%e6%b8%b8%e6%a8%99-nfZokrmAWM\">4. \u95dc\u9589\u6e38\u6a19<\/h4>\n<p>\u7576\u5b8c\u6210\u6578\u64da\u63d0\u53d6\u5f8c\uff0c\u4f7f\u7528 <code>CLOSE<\/code> \u8a9e\u53e5\u4f86\u95dc\u9589\u6e38\u6a19\u3002<\/p>\n<h4 id=\"5-%e9%87%8b%e6%94%be%e6%b8%b8%e6%a8%99-nfZokrmAWM\">5. \u91cb\u653e\u6e38\u6a19<\/h4>\n<p>\u6700\u5f8c\uff0c\u4f7f\u7528 <code>DEALLOCATE<\/code> \u8a9e\u53e5\u4f86\u91cb\u653e\u6e38\u6a19\uff0c\u9019\u6a23\u53ef\u4ee5\u91cb\u653e\u7cfb\u7d71\u8cc7\u6e90\u3002<\/p>\n<h2 id=\"%e6%b8%b8%e6%a8%99%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-nfZokrmAWM\">\u6e38\u6a19\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u6e38\u6a19\u5728\u591a\u7a2e\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u9010\u884c\u8655\u7406\u6578\u64da\uff1a<\/strong>\u7576\u9700\u8981\u5c0d\u67e5\u8a62\u7d50\u679c\u7684\u6bcf\u4e00\u884c\u9032\u884c\u8a08\u7b97\u6216\u66f4\u65b0\u6642\uff0c\u6e38\u6a19\u63d0\u4f9b\u4e86\u4e00\u7a2e\u65b9\u4fbf\u7684\u65b9\u5f0f\u3002<\/li>\n<li><strong>\u8907\u96dc\u7684\u696d\u52d9\u908f\u8f2f\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u696d\u52d9\u908f\u8f2f\u53ef\u80fd\u9700\u8981\u6839\u64da\u524d\u4e00\u884c\u7684\u7d50\u679c\u4f86\u6c7a\u5b9a\u7576\u524d\u884c\u7684\u8655\u7406\u65b9\u5f0f\uff0c\u9019\u6642\u6e38\u6a19\u53ef\u4ee5\u5e6b\u52a9\u5be6\u73fe\u3002<\/li>\n<li><strong>\u6578\u64da\u9077\u79fb\uff1a<\/strong>\u5728\u6578\u64da\u9077\u79fb\u904e\u7a0b\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u9010\u884c\u8b80\u53d6\u820a\u6578\u64da\u4e26\u63d2\u5165\u5230\u65b0\u8868\u4e2d\uff0c\u6e38\u6a19\u53ef\u4ee5\u7c21\u5316\u9019\u4e00\u904e\u7a0b\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-nfZokrmAWM\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u6e38\u6a19\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5b83\u5011\u4e5f\u6709\u4e00\u4e9b\u7f3a\u9ede\u3002\u4f7f\u7528\u6e38\u6a19\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u6e38\u6a19\u4e4b\u524d\uff0c\u61c9\u8003\u616e\u662f\u5426\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\uff08\u5982\u6279\u91cf\u64cd\u4f5c\u6216\u96c6\u5408\u64cd\u4f5c\uff09\u4f86\u9054\u6210\u76f8\u540c\u7684\u76ee\u7684\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-nfZokrmAWM\">\u7e3d\u7d50<\/h2>\n<p>\u6e38\u6a19\u662f SQL \u4e2d\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\u96c6\uff0c\u9069\u7528\u65bc\u591a\u7a2e\u696d\u52d9\u9700\u6c42\u3002\u7136\u800c\uff0c\u4f7f\u7528\u6e38\u6a19\u6642\u9700\u8b39\u614e\uff0c\u4ee5\u907f\u514d\u6027\u80fd\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u60c5\u6cc1\uff0c\u8003\u616e\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\u53ef\u80fd\u66f4\u70ba\u5408\u9069\u3002\u5982\u679c\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u670d\u52d9\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u4e2d\u6e38\u6a19\u7684\u8a9e\u6cd5\u53ca\u61c9\u7528\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u7ba1\u7406\u548c\u64cd\u4f5c\u67e5\u8a62\u7d50\u679c\u96c6\uff0c\u63d0\u5347\u6578\u64da\u8655\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-168551","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168551","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=168551"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168551\/revisions"}],"predecessor-version":[{"id":168552,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168551\/revisions\/168552"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168551"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168551"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168551"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}