{"id":15376,"date":"2023-12-04T19:42:14","date_gmt":"2023-12-04T11:42:14","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15376"},"modified":"2023-12-04T19:44:03","modified_gmt":"2023-12-04T11:44:03","slug":"oracle-zhong-shuo-ming-ru-he-zai-zhi-ding-de-kuai","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-shuo-ming-ru-he-zai-zhi-ding-de-kuai\/","title":{"rendered":"Oracle \u4e2d\u8bf4\u660e\u5982\u4f55\u5728\u6307\u5b9a\u7684\u5757\u4e2d\u8fed\u4ee3\u9879\u76ee\u548c\u8bb0\u5f55\uff1f"},"content":{"rendered":"<p>\u5728 Oracle \u6570\u636e\u5e93\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u7ed3\u6784\u548c\u6e38\u6807\u6765\u8fed\u4ee3\u5757\u4e2d\u7684\u9879\u76ee\u548c\u8bb0\u5f55\u3002\u4e00\u4e2a\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 PL\/SQL \u7f16\u5199\u5faa\u73af\u6765\u904d\u5386\u5757\u4e2d\u7684\u6570\u636e\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u6e38\u6807\u548c\u5faa\u73af\u6765\u8fed\u4ee3\u8bb0\u5f55\uff1a<\/p>\n<pre><code class=\"language-sql  line-numbers\">DECLARE\n    CURSOR your_cursor IS\n        SELECT column1, column2\n        FROM your_table\n        WHERE your_condition; -- \u53ef\u9009\uff1a\u8bbe\u7f6e\u4f60\u7684\u6761\u4ef6\n\n    var_column1 your_table.column1%TYPE; -- \u66ff\u6362 your_table.column1 \u548c your_table.column2 \u4e3a\u5b9e\u9645\u7684\u8868\u548c\u5217\u540d\n    var_column2 your_table.column2%TYPE;\n\nBEGIN\n    OPEN your_cursor;\n    LOOP\n        FETCH your_cursor INTO var_column1, var_column2;\n        EXIT WHEN your_cursor%NOTFOUND; -- \u5f53\u6ca1\u6709\u66f4\u591a\u8bb0\u5f55\u65f6\u9000\u51fa\u5faa\u73af\n\n        -- \u5728\u8fd9\u91cc\u53ef\u4ee5\u5bf9\u83b7\u53d6\u7684\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\n        -- \u4f8b\u5982\uff1a\u8f93\u51fa\u5230\u5c4f\u5e55\u6216\u6267\u884c\u5176\u4ed6\u903b\u8f91\n        DBMS_OUTPUT.PUT_LINE('Column1: ' || var_column1 || ', Column2: ' || var_column2);\n    END LOOP;\n\n    CLOSE your_cursor;\nEND;\n\/\n<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff1a<\/p>\n<ul>\n<li><code>your_cursor<\/code> \u662f\u4e00\u4e2a\u6e38\u6807\uff0c\u7528\u4e8e\u9009\u62e9\u6570\u636e\u8bb0\u5f55\u3002<\/li>\n<li><code>FETCH<\/code> \u8bed\u53e5\u7528\u4e8e\u4ece\u6e38\u6807\u4e2d\u83b7\u53d6\u6570\u636e\u8bb0\u5f55\u5230\u5b9a\u4e49\u7684\u53d8\u91cf\u4e2d\u3002<\/li>\n<li><code>EXIT WHEN<\/code> \u7528\u4e8e\u5728\u6ca1\u6709\u66f4\u591a\u8bb0\u5f55\u65f6\u9000\u51fa\u5faa\u73af\u3002<\/li>\n<\/ul>\n<p>\u4f60\u53ef\u4ee5\u6839\u636e\u9700\u8981\u4fee\u6539\u6e38\u6807\u7684 <code>SELECT<\/code> \u8bed\u53e5\u548c\u5faa\u73af\u4e2d\u7684\u903b\u8f91\uff0c\u4ee5\u6ee1\u8db3\u7279\u5b9a\u7684\u8981\u6c42\u3002\u6b64\u5916\uff0c\u4f60\u4e5f\u53ef\u4ee5\u5728\u6e38\u6807\u7684 <code>WHERE<\/code> \u5b50\u53e5\u4e2d\u6dfb\u52a0\u6761\u4ef6\u6765\u9009\u62e9\u7279\u5b9a\u7684\u8bb0\u5f55\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Oracle \u6570\u636e\u5e93\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u7ed3\u6784\u548c\u6e38\u6807\u6765\u8fed\u4ee3\u5757\u4e2d\u7684\u9879\u76ee\u548c\u8bb0\u5f55\u3002\u4e00\u4e2a\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 PL\/SQL  [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-15376","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15376","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=15376"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15376\/revisions"}],"predecessor-version":[{"id":15377,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15376\/revisions\/15377"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15376"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15376"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15376"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}