{"id":5757,"date":"2024-11-14T10:42:32","date_gmt":"2024-11-14T02:42:32","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5757\/"},"modified":"2024-11-14T10:42:32","modified_gmt":"2024-11-14T02:42:32","slug":"oracle-for%e5%be%aa%e7%8e%af%e6%80%8e%e4%b9%88%e5%86%99-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5757\/","title":{"rendered":"oracle for\u5faa\u73af\u600e\u4e48\u5199"},"content":{"rendered":"<blockquote><p>\n  \u7b54\u6848\uff1aoracle for \u5faa\u73af\u7528\u4e8e\u904d\u5386\u8868\u4e2d\u7684\u4e00\u7cfb\u5217\u884c\u6216\u503c\u3002\u8bed\u6cd5\uff1a for loop_variable in (select column_name from table_name [where condition]) loop &#8212; \u5728\u5faa\u73af\u4f53\u5185\u6267\u884c\u7684\u8bed\u53e5 end loop;\u4f7f\u7528\u65b9\u6cd5\uff1a \u5b9a\u4e49\u4e00\u4e2a\u5faa\u73af\u53d8\u91cf\uff0c\u7528\u4e8e\u5b58\u50a8\u6bcf\u6b21\u904d\u5386\u4e2d\u7684\u5f53\u524d\u884c\u6216\u503c\uff1b\u6761\u4ef6\u8fc7\u6ee4\uff1a \u4f7f\u7528 where \u5b50\u53e5\u8fc7\u6ee4\u8981\u904d\u5386\u7684\u884c\uff1b\u5d4c\u5957\u5faa\u73af\uff1a oracle \u652f\u6301\u5d4c\u5957\u5faa\u73af\uff1b\u66ff\u4ee3\u65b9\u6cd5\uff1a \u9664\u4e86 for \u5faa\u73af\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 cursor \u548c fetc\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/30\/2024053022153458495.jpg\" class=\"aligncenter\" title=\"oracle for\u5faa\u73af\u600e\u4e48\u5199\u63d2\u56fe\" alt=\"oracle for\u5faa\u73af\u600e\u4e48\u5199\u63d2\u56fe\" \/><\/p>\n<p><strong>Oracle for\u5faa\u73af<\/strong><\/p>\n<p>\u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 FOR \u5faa\u73af<strong>\u904d\u5386<\/strong>\u8868\u4e2d\u7684\u4e00\u7cfb\u5217\u884c\u6216\u503c\u3002<\/p>\n<p><strong>\u8bed\u6cd5<\/strong><\/p>\n<pre>FOR loop_variable IN (SELECT column_name FROM table_name [WHERE condition])\nLOOP\n  -- \u5728\u5faa\u73af\u4f53\u5185\u6267\u884c\u7684\u8bed\u53e5\nEND LOOP;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u793a\u4f8b<\/strong><\/p>\n<p>\u4ee5\u4e0b\u4ee3\u7801\u7247\u65ad\u4ece customers \u8868\u4e2d\u63d0\u53d6\u6240\u6709\u5ba2\u6237\u59d3\u540d\u5e76\u4f7f\u7528 FOR \u5faa\u73af\u5c06\u5176\u6253\u5370\u5230\u63a7\u5236\u53f0\uff1a<\/p>\n<pre>FOR customer_name IN (SELECT customer_name FROM customers)\nLOOP\n  DBMS_OUTPUT.PUT_LINE(customer_name);\nEND LOOP;<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528\u53d8\u91cf<\/strong><\/p>\n<p>FOR \u5faa\u73af\u4e2d\u7684 loop_variable \u662f\u4e00\u4e2a\u53d8\u91cf\uff0c\u7528\u4e8e\u5b58\u50a8\u6bcf\u6b21\u904d\u5386\u4e2d\u7684\u5f53\u524d\u884c\u6216\u503c\u3002\u53ef\u4ee5\u4f7f\u7528\u6b64\u53d8\u91cf\u5728\u5faa\u73af\u4f53\u4e2d\u5f15\u7528\u6570\u636e\u3002<\/p>\n<p><strong>\u6761\u4ef6<\/strong><\/p>\n<p>WHERE \u5b50\u53e5\u7528\u4e8e\u8fc7\u6ee4\u8981\u904d\u5386\u7684\u884c\u3002\u53ea\u8fd4\u56de\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u3002<\/p>\n<p><strong>\u5d4c\u5957\u5faa\u73af<\/strong><\/p>\n<p>Oracle \u5141\u8bb8\u5d4c\u5957\u5faa\u73af\uff0c\u5176\u4e2d\u4e00\u4e2a\u5faa\u73af\u5d4c\u5957\u5728\u53e6\u4e00\u4e2a\u5faa\u73af\u5185\u3002\u8fd9\u7528\u4e8e\u5904\u7406\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n<p><strong>\u66ff\u4ee3\u65b9\u6cd5<\/strong><\/p>\n<p>\u9664\u4e86 FOR \u5faa\u73af\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 CURSOR \u548c FETCH \u8bed\u53e5\u5728 Oracle \u4e2d\u904d\u5386\u6570\u636e\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f for\u5faa\u73af\u600e\u4e48\u5199\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b54\u6848\uff1aoracle for \u5faa\u73af\u7528\u4e8e\u904d\u5386\u8868\u4e2d\u7684\u4e00\u7cfb\u5217\u884c\u6216\u503c\u3002\u8bed\u6cd5\uff1a for loop_variable in (select column_name from table_name [where condition]) loop &#8212; \u5728\u5faa\u73af\u4f53\u5185\u6267\u884c\u7684\u8bed\u53e5 end loop;\u4f7f\u7528\u65b9\u6cd5\uff1a \u5b9a\u4e49\u4e00\u4e2a\u5faa\u73af\u53d8\u91cf\uff0c\u7528\u4e8e\u5b58\u50a8\u6bcf\u6b21\u904d\u5386\u4e2d\u7684\u5f53\u524d\u884c\u6216\u503c\uff1b\u6761\u4ef6\u8fc7\u6ee4\uff1a \u4f7f\u7528 where \u5b50\u53e5\u8fc7\u6ee4\u8981\u904d\u5386\u7684\u884c\uff1b\u5d4c\u5957\u5faa\u73af\uff1a oracle \u652f\u6301\u5d4c\u5957\u5faa\u73af\uff1b\u66ff\u4ee3\u65b9\u6cd5\uff1a \u9664\u4e86 for \u5faa\u73af\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 cursor \u548c fetc Oracle for\u5faa\u73af \u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 FOR \u5faa\u73af\u904d\u5386\u8868\u4e2d\u7684\u4e00\u7cfb\u5217\u884c\u6216\u503c\u3002 \u8bed\u6cd5 FOR loop_variable IN (SELECT column_name FROM table_name [WHERE condition]) LOOP &#8212; \u5728\u5faa\u73af\u4f53\u5185\u6267\u884c\u7684\u8bed\u53e5 END LOOP; \u767b\u5f55\u540e\u590d\u5236 \u793a\u4f8b \u4ee5\u4e0b\u4ee3\u7801\u7247\u65ad\u4ece customers [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5757","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5757","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5757"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5757\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5757"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}