{"id":94964,"date":"2024-10-19T21:06:18","date_gmt":"2024-10-19T13:06:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94964\/"},"modified":"2024-10-19T21:06:19","modified_gmt":"2024-10-19T13:06:19","slug":"oracle%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%83%85%e6%b3%81%e8%bf%bd%e4%b8%ad","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94964\/","title":{"rendered":"Oracle\u89f8\u767c\u5668\u7684\u4f7f\u7528\u60c5\u6cc1\u8ffd\u4e2d"},"content":{"rendered":"<h1 id=\"oracle%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%83%85%e6%b3%81%e8%bf%bd%e4%b8%ad-pCqhhsgeBa\">Oracle\u89f8\u767c\u5668\u7684\u4f7f\u7528\u60c5\u6cc1\u8ffd\u4e2d<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u81ea\u52d5\u57f7\u884c\u7279\u5b9a\u64cd\u4f5c\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u8c50\u5bcc\u7684\u89f8\u767c\u5668\u529f\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u89f8\u767c\u5668\u7684\u4f7f\u7528\u60c5\u6cc1\u3001\u985e\u578b\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%9f-pCqhhsgeBa\">\u4ec0\u9ebc\u662f\u89f8\u767c\u5668\uff1f<\/h2>\n<p>\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5b58\u5132\u904e\u7a0b\uff0c\u6703\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u9019\u4e9b\u4e8b\u4ef6\u901a\u5e38\u5305\u62ec\u5c0d\u6578\u64da\u8868\u7684\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u3002\u89f8\u767c\u5668\u7684\u4e3b\u8981\u76ee\u7684\u662f\u81ea\u52d5\u5316\u6578\u64da\u8655\u7406\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\uff0c\u4e26\u57f7\u884c\u4e00\u4e9b\u696d\u52d9\u908f\u8f2f\u3002<\/p>\n<h2 id=\"oracle%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e9%a1%9e%e5%9e%8b-pCqhhsgeBa\">Oracle\u89f8\u767c\u5668\u7684\u985e\u578b<\/h2>\n<p>Oracle\u6578\u64da\u5eab\u652f\u6301\u591a\u7a2e\u89f8\u767c\u5668\uff0c\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u5e7e\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u884c\u7d1a\u89f8\u767c\u5668\uff08Row-level Trigger\uff09<\/strong>: \u9019\u7a2e\u89f8\u767c\u5668\u5728\u6bcf\u4e00\u884c\u6578\u64da\u88ab\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u6642\u57f7\u884c\u3002\u5b83\u9069\u5408\u9700\u8981\u5c0d\u6bcf\u4e00\u884c\u9032\u884c\u64cd\u4f5c\u7684\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u8a9e\u53e5\u7d1a\u89f8\u767c\u5668\uff08Statement-level Trigger\uff09<\/strong>: \u9019\u7a2e\u89f8\u767c\u5668\u5728\u6574\u500bSQL\u8a9e\u53e5\u57f7\u884c\u6642\u57f7\u884c\u4e00\u6b21\uff0c\u800c\u4e0d\u662f\u5c0d\u6bcf\u4e00\u884c\u9032\u884c\u64cd\u4f5c\u3002\u5b83\u9069\u5408\u9700\u8981\u5728\u6574\u9ad4\u4e0a\u9032\u884c\u64cd\u4f5c\u7684\u60c5\u6cc1\u3002<\/li>\n<li><strong>BEFORE\u89f8\u767c\u5668<\/strong>: \u5728\u57f7\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u4e4b\u524d\u89f8\u767c\uff0c\u901a\u5e38\u7528\u65bc\u9a57\u8b49\u6578\u64da\u6216\u4fee\u6539\u5373\u5c07\u63d2\u5165\u7684\u6578\u64da\u3002<\/li>\n<li><strong>AFTER\u89f8\u767c\u5668<\/strong>: \u5728\u57f7\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u4e4b\u5f8c\u89f8\u767c\uff0c\u901a\u5e38\u7528\u65bc\u8a18\u9304\u64cd\u4f5c\u6216\u66f4\u65b0\u5176\u4ed6\u8868\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%83%85%e6%b3%81-pCqhhsgeBa\">\u89f8\u767c\u5668\u7684\u4f7f\u7528\u60c5\u6cc1<\/h2>\n<p>\u89f8\u767c\u5668\u5728\u591a\u7a2e\u60c5\u6cc1\u4e0b\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u4f7f\u7528\u5834\u666f\uff1a<\/p>\n<h3 id=\"1-%e6%95%b8%e6%93%9a%e5%ae%8c%e6%95%b4%e6%80%a7-pCqhhsgeBa\">1. \u6578\u64da\u5b8c\u6574\u6027<\/h3>\n<p>\u89f8\u767c\u5668\u53ef\u4ee5\u7528\u4f86\u5f37\u5236\u57f7\u884c\u6578\u64da\u5b8c\u6574\u6027\u7d04\u675f\u3002\u4f8b\u5982\uff0c\u5728\u63d2\u5165\u6578\u64da\u4e4b\u524d\uff0c\u53ef\u4ee5\u4f7f\u7528BEFORE\u89f8\u767c\u5668\u6aa2\u67e5\u67d0\u4e9b\u689d\u4ef6\u662f\u5426\u6eff\u8db3\uff0c\u5f9e\u800c\u9632\u6b62\u4e0d\u5408\u898f\u7684\u6578\u64da\u9032\u5165\u6578\u64da\u5eab\u3002<\/p>\n<pre><code>CREATE OR REPLACE TRIGGER check_salary\nBEFORE INSERT ON employees\nFOR EACH ROW\nBEGIN\n    IF :new.salary &lt; 0 THEN\n        RAISE_APPLICATION_ERROR(-20001, &#039;\u85aa\u6c34\u4e0d\u80fd\u70ba\u8ca0\u6578&#039;);\n    END IF;\nEND;\n<\/code><\/pre>\n<h3 id=\"2-%e5%af%a9%e8%a8%88%e5%92%8c%e6%97%a5%e8%aa%8c%e8%a8%98%e9%8c%84-pCqhhsgeBa\">2. \u5be9\u8a08\u548c\u65e5\u8a8c\u8a18\u9304<\/h3>\n<p>\u89f8\u767c\u5668\u53ef\u4ee5\u7528\u4f86\u81ea\u52d5\u8a18\u9304\u6578\u64da\u8b8a\u66f4\u7684\u6b77\u53f2\u3002\u4f8b\u5982\uff0c\u7576\u67d0\u500b\u8868\u7684\u6578\u64da\u88ab\u66f4\u65b0\u6642\uff0c\u53ef\u4ee5\u81ea\u52d5\u5c07\u8b8a\u66f4\u8a18\u9304\u5230\u53e6\u4e00\u500b\u65e5\u8a8c\u8868\u4e2d\u3002<\/p>\n<pre><code>CREATE OR REPLACE TRIGGER log_employee_updates\nAFTER UPDATE ON employees\nFOR EACH ROW\nBEGIN\n    INSERT INTO employee_log (employee_id, old_salary, new_salary, change_date)\n    VALUES (:old.id, :old.salary, :new.salary, SYSDATE);\nEND;\n<\/code><\/pre>\n<h3 id=\"3-%e8%87%aa%e5%8b%95%e8%a8%88%e7%ae%97%e5%92%8c%e6%9b%b4%e6%96%b0-pCqhhsgeBa\">3. \u81ea\u52d5\u8a08\u7b97\u548c\u66f4\u65b0<\/h3>\n<p>\u89f8\u767c\u5668\u9084\u53ef\u4ee5\u7528\u4f86\u81ea\u52d5\u8a08\u7b97\u548c\u66f4\u65b0\u5176\u4ed6\u8868\u4e2d\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u7576\u67d0\u500b\u8868\u7684\u6578\u64da\u88ab\u63d2\u5165\u6216\u66f4\u65b0\u6642\uff0c\u53ef\u4ee5\u81ea\u52d5\u66f4\u65b0\u76f8\u95dc\u7684\u7d71\u8a08\u4fe1\u606f\u3002<\/p>\n<pre><code>CREATE OR REPLACE TRIGGER update_department_stats\nAFTER INSERT OR UPDATE ON employees\nFOR EACH ROW\nBEGIN\n    UPDATE departments\n    SET total_employees = total_employees + 1\n    WHERE department_id = :new.department_id;\nEND;\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-pCqhhsgeBa\">\u7d50\u8ad6<\/h2>\n<p>Oracle\u89f8\u767c\u5668\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u81ea\u52d5\u5316\u6578\u64da\u8655\u7406\u3001\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u4e26\u57f7\u884c\u696d\u52d9\u908f\u8f2f\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5b8c\u6574\u6027\u6aa2\u67e5\u3001\u5be9\u8a08\u65e5\u8a8c\u8a18\u9304\u9084\u662f\u81ea\u52d5\u8a08\u7b97\u66f4\u65b0\u65b9\u9762\uff0c\u89f8\u767c\u5668\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u7136\u800c\uff0c\u4f7f\u7528\u89f8\u767c\u5668\u6642\u4e5f\u9700\u8b39\u614e\uff0c\u904e\u591a\u7684\u89f8\u767c\u5668\u53ef\u80fd\u6703\u5f71\u97ff\u6578\u64da\u5eab\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u5408\u7406\u4f7f\u7528\u89f8\u767c\u5668\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u53ca\u5176\u61c9\u7528\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u89f8\u767c\u5668\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u4e86\u89e3\u5176\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u61c9\u7528\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u7cfb\u7d71\u6548\u7387\u8207\u6578\u64da\u5b8c\u6574\u6027\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-94964","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94964","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=94964"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94964\/revisions"}],"predecessor-version":[{"id":94965,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94964\/revisions\/94965"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94964"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}