{"id":15687,"date":"2023-12-04T21:38:05","date_gmt":"2023-12-04T13:38:05","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15687"},"modified":"2023-12-04T21:50:43","modified_gmt":"2023-12-04T13:50:43","slug":"oracle-zhong-chu-fa-qi-zhong-when-zi-ju-de-yong-tu","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-chu-fa-qi-zhong-when-zi-ju-de-yong-tu\/","title":{"rendered":"Oracle \u4e2d\u89e6\u53d1\u5668\u4e2d WHEN \u5b50\u53e5\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u89e6\u53d1\u5668\u7684 <code>WHEN<\/code> \u5b50\u53e5\u7528\u4e8e\u6307\u5b9a\u89e6\u53d1\u5668\u5e94\u8be5\u5728\u4f55\u65f6\u89e6\u53d1\u3002\u8fd9\u4e2a\u5b50\u53e5\u901a\u5e38\u7528\u4e8e\u63a7\u5236\u89e6\u53d1\u5668\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u662f\u5426\u6267\u884c\u3002<\/p>\n<p>\u5177\u4f53\u6765\u8bf4\uff0c<code>WHEN<\/code> \u5b50\u53e5\u540e\u9762\u53ef\u4ee5\u8ddf\u968f\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u7528\u4e8e\u786e\u5b9a\u89e6\u53d1\u5668\u662f\u5426\u5e94\u8be5\u6267\u884c\u89e6\u53d1\u7684\u52a8\u4f5c\u3002\u5982\u679c\u6761\u4ef6\u8868\u8fbe\u5f0f\u4e3a\u771f\uff08<code>TRUE<\/code>\uff09\uff0c\u89e6\u53d1\u5668\u5c31\u4f1a\u6267\u884c\u5176\u5b9a\u4e49\u7684\u64cd\u4f5c\uff1b\u53cd\u4e4b\uff0c\u5982\u679c\u6761\u4ef6\u4e3a\u5047\uff08<code>FALSE<\/code>\uff09\uff0c\u89e6\u53d1\u5668\u5c06\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u5728\u89e6\u53d1\u5668\u4e2d\u4f7f\u7528 <code>WHEN<\/code> \u5b50\u53e5\u6765\u6307\u5b9a\u53ea\u6709\u5728\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u89e6\u53d1\u5668\u624d\u4f1a\u6267\u884c\u3002\u8fd9\u5bf9\u4e8e\u63a7\u5236\u89e6\u53d1\u5668\u7684\u884c\u4e3a\u548c\u6267\u884c\u903b\u8f91\u662f\u5f88\u6709\u7528\u7684\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u8981\u6709\u9009\u62e9\u5730\u89e6\u53d1\u89e6\u53d1\u5668\u3002<\/p>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-sql\">CREATE OR REPLACE TRIGGER my_trigger\nBEFORE INSERT ON my_table\nFOR EACH ROW\nWHEN (NEW.salary &gt; 5000)\nBEGIN\n   -- \u89e6\u53d1\u5668\u903b\u8f91\nEND;\n<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<code>WHEN (NEW.salary &gt; 5000)<\/code> \u6307\u5b9a\u4e86\u89e6\u53d1\u5668\u4ec5\u5728\u63d2\u5165\u7684\u884c\u7684 <code>salary<\/code> \u5217\u5927\u4e8e 5000 \u65f6\u89e6\u53d1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Oracle \u4e2d\uff0c\u89e6\u53d1\u5668\u7684 WHEN \u5b50\u53e5\u7528\u4e8e\u6307\u5b9a\u89e6\u53d1\u5668\u5e94\u8be5\u5728\u4f55\u65f6\u89e6\u53d1\u3002\u8fd9\u4e2a\u5b50\u53e5\u901a\u5e38\u7528\u4e8e\u63a7\u5236\u89e6\u53d1\u5668\u5728\u7279\u5b9a\u6761 [&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-15687","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15687","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=15687"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15687\/revisions"}],"predecessor-version":[{"id":15688,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15687\/revisions\/15688"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15687"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15687"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15687"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}