{"id":377,"date":"2020-12-05T03:36:19","date_gmt":"2020-12-04T19:36:19","guid":{"rendered":"http:\/\/moyisuiying.com\/?p=377"},"modified":"2020-12-10T14:23:59","modified_gmt":"2020-12-10T06:23:59","slug":"mysql%e5%ad%a6%e4%b9%a0%e4%b8%8e%e5%ae%9e%e9%aa%8c%ef%bc%88%e4%b9%9d%ef%bc%89-%e8%a7%a6%e5%8f%91%e5%99%a8","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/experiment\/mysqlexperiment\/377.html","title":{"rendered":"MYSQL\u5b66\u4e60\u4e0e\u5b9e\u9a8c\uff08\u4e5d\uff09\u2014\u2014\u89e6\u53d1\u5668"},"content":{"rendered":"\n<h2>9\u89e6\u53d1\u5668<\/h2>\n\n\n\n<h3>9.1\u89e6\u53d1\u5668\u662f\u4ec0\u4e48<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>MySQL \u7684\u89e6\u53d1\u5668\u548c\u5b58\u50a8\u8fc7\u7a0b\u4e00\u6837\uff0c\u90fd\u662f\u5d4c\u5165\u5230 MySQL \u4e2d\u7684\u4e00\u6bb5\u7a0b\u5e8f\uff0c\u662f MySQL \u4e2d\u7ba1\u7406\u6570\u636e\u7684\u6709\u529b\u5de5\u5177\u3002\u4e0d\u540c\u7684\u662f\u6267\u884c\u5b58\u50a8\u8fc7\u7a0b\u8981\u4f7f\u7528 CALL \u8bed\u53e5\u6765\u8c03\u7528\uff0c\u800c\u89e6\u53d1\u5668\u7684\u6267\u884c\u4e0d\u9700\u8981\u4f7f\u7528 CALL \u8bed\u53e5\u6765\u8c03\u7528\uff0c\u4e5f\u4e0d\u9700\u8981\u624b\u5de5\u542f\u52a8\uff0c\u800c\u662f\u901a\u8fc7\u5bf9\u6570\u636e\u8868\u7684\u76f8\u5173\u64cd\u4f5c\u6765\u89e6\u53d1\u3001\u6fc0\u6d3b\u4ece\u800c\u5b9e\u73b0\u6267\u884c\u3002\u6bd4\u5982\u5f53\u5bf9 student \u8868\u8fdb\u884c\u64cd\u4f5c\uff08INSERT\uff0cDELETE \u6216 UPDATE\uff09\u65f6\u5c31\u4f1a\u6fc0\u6d3b\u5b83\u6267\u884c\u3002<\/p><\/blockquote>\n\n\n\n<p>\u89e6\u53d1\u5668\u4e0e\u6570\u636e\u8868\u5173\u7cfb\u5bc6\u5207\uff0c\u4e3b\u8981\u7528\u4e8e\u4fdd\u62a4\u8868\u4e2d\u7684\u6570\u636e\u3002\u7279\u522b\u662f\u5f53\u6709\u591a\u4e2a\u8868\u5177\u6709\u4e00\u5b9a\u7684\u76f8\u4e92\u8054\u7cfb\u7684\u65f6\u5019\uff0c\u89e6\u53d1\u5668\u80fd\u591f\u8ba9\u4e0d\u540c\u7684\u8868\u4fdd\u6301\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<p>\u5728 MySQL \u4e2d\uff0c\u53ea\u6709\u6267\u884c INSERT\u3001UPDATE \u548c DELETE \u64cd\u4f5c\u65f6\u624d\u80fd\u6fc0\u6d3b\u89e6\u53d1\u5668\uff0c\u5176\u5b83 SQL \u8bed\u53e5\u5219\u4e0d\u4f1a\u6fc0\u6d3b\u89e6\u53d1\u5668\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u89e6\u53d1\u5668\u5462\uff1f\u6bd4\u5982\uff0c\u5728\u5b9e\u9645\u5f00\u53d1\u9879\u76ee\u65f6\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4ee5\u4e0b\u60c5\u51b5\uff1a<\/p>\n\n\n\n<ul><li>\u5728\u5b66\u751f\u8868\u4e2d\u6dfb\u52a0\u4e00\u6761\u5173\u4e8e\u5b66\u751f\u7684\u8bb0\u5f55\u65f6\uff0c\u5b66\u751f\u7684\u603b\u6570\u5c31\u5fc5\u987b\u540c\u65f6\u6539\u53d8\u3002<\/li><li>\u589e\u52a0\u4e00\u6761\u5b66\u751f\u8bb0\u5f55\u65f6\uff0c\u9700\u8981\u68c0\u67e5\u5e74\u9f84\u662f\u5426\u7b26\u5408\u8303\u56f4\u8981\u6c42\u3002<\/li><li>\u5220\u9664\u4e00\u6761\u5b66\u751f\u4fe1\u606f\u65f6\uff0c\u9700\u8981\u5220\u9664\u5176\u6210\u7ee9\u8868\u4e0a\u7684\u5bf9\u5e94\u8bb0\u5f55\u3002<\/li><li>\u5220\u9664\u4e00\u6761\u6570\u636e\u65f6\uff0c\u9700\u8981\u5728\u6570\u636e\u5e93\u5b58\u6863\u8868\u4e2d\u4fdd\u7559\u4e00\u4e2a\u5907\u4efd\u526f\u672c\u3002<\/li><\/ul>\n\n\n\n<p>\u867d\u7136\u4e0a\u8ff0\u60c5\u51b5\u5b9e\u73b0\u7684\u4e1a\u52a1\u903b\u8f91\u4e0d\u540c\uff0c\u4f46\u662f\u5b83\u4eec\u90fd\u9700\u8981\u5728\u6570\u636e\u8868\u53d1\u751f\u66f4\u6539\u65f6\uff0c\u81ea\u52a8\u8fdb\u884c\u4e00\u4e9b\u5904\u7406\u3002\u8fd9\u65f6\u5c31\u53ef\u4ee5\u4f7f\u7528\u89e6\u53d1\u5668\u5904\u7406\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u7b2c\u4e00\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u89e6\u53d1\u5668\u5bf9\u8c61\uff0c\u6bcf\u5f53\u6dfb\u52a0\u4e00\u6761\u5b66\u751f\u8bb0\u5f55\u65f6\uff0c\u5c31\u6267\u884c\u4e00\u6b21\u8ba1\u7b97\u5b66\u751f\u603b\u6570\u7684\u64cd\u4f5c\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u6bcf\u6b21\u6dfb\u52a0\u4e00\u6761\u5b66\u751f\u8bb0\u5f55\u540e\uff0c\u5b66\u751f\u603b\u6570\u548c\u5b66\u751f\u8bb0\u5f55\u6570\u662f\u4e00\u81f4\u7684\u3002<\/p>\n\n\n\n<h3>9.2\u521b\u5efa\u57fa\u672c\u8bed\u6cd5<\/h3>\n\n\n\n<p>\u5728 MySQL 5.7 \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 CREATE TRIGGER \u8bed\u53e5\u521b\u5efa\u89e6\u53d1\u5668\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE  trigger &lt;\u89e6\u53d1\u5668\u540d> &lt; BEFORE | AFTER >\n&lt;INSERT | UPDATE | DELETE >\nON &lt;\u8868\u540d> FOR EACH Row&lt;\u89e6\u53d1\u5668\u4e3b\u4f53><\/code><\/pre>\n\n\n\n<p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\u3002<\/p>\n\n\n\n<h5>1) \u89e6\u53d1\u5668\u540d<\/h5>\n\n\n\n<p>\u89e6\u53d1\u5668\u7684\u540d\u79f0\uff0c\u89e6\u53d1\u5668\u5728\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u5fc5\u987b\u5177\u6709\u552f\u4e00\u7684\u540d\u79f0\u3002\u5982\u679c\u8981\u5728\u67d0\u4e2a\u7279\u5b9a\u6570\u636e\u5e93\u4e2d\u521b\u5efa\uff0c\u540d\u79f0\u524d\u9762\u5e94\u8be5\u52a0\u4e0a\u6570\u636e\u5e93\u7684\u540d\u79f0\u3002<\/p>\n\n\n\n<h5>2) INSERT | UPDATE | DELETE<\/h5>\n\n\n\n<p>\u89e6\u53d1\u4e8b\u4ef6\uff0c\u7528\u4e8e\u6307\u5b9a\u6fc0\u6d3b\u89e6\u53d1\u5668\u7684\u8bed\u53e5\u7684\u79cd\u7c7b\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\uff1a\u4e09\u79cd\u89e6\u53d1\u5668\u7684\u6267\u884c\u65f6\u95f4\u5982\u4e0b\u3002<\/p>\n\n\n\n<ul><li>INSERT\uff1a\u5c06\u65b0\u884c\u63d2\u5165\u8868\u65f6\u6fc0\u6d3b\u89e6\u53d1\u5668\u3002\u4f8b\u5982\uff0cINSERT \u7684 BEFORE \u89e6\u53d1\u5668\u4e0d\u4ec5\u80fd\u88ab MySQL \u7684 INSERT \u8bed\u53e5\u6fc0\u6d3b\uff0c\u4e5f\u80fd\u88ab LOAD DATA \u8bed\u53e5\u6fc0\u6d3b\u3002<\/li><li>DELETE\uff1a \u4ece\u8868\u4e2d\u5220\u9664\u67d0\u4e00\u884c\u6570\u636e\u65f6\u6fc0\u6d3b\u89e6\u53d1\u5668\uff0c\u4f8b\u5982 DELETE \u548c REPLACE \u8bed\u53e5\u3002<\/li><li>UPDATE\uff1a\u66f4\u6539\u8868\u4e2d\u67d0\u4e00\u884c\u6570\u636e\u65f6\u6fc0\u6d3b\u89e6\u53d1\u5668\uff0c\u4f8b\u5982 UPDATE \u8bed\u53e5\u3002<\/li><\/ul>\n\n\n\n<h5>3) BEFORE | AFTER<\/h5>\n\n\n\n<p>BEFORE \u548c AFTER\uff0c\u89e6\u53d1\u5668\u88ab\u89e6\u53d1\u7684\u65f6\u523b\uff0c\u8868\u793a\u89e6\u53d1\u5668\u662f\u5728\u6fc0\u6d3b\u5b83\u7684\u8bed\u53e5\u4e4b\u524d\u6216\u4e4b\u540e\u89e6\u53d1\u3002\u82e5\u5e0c\u671b\u9a8c\u8bc1\u65b0\u6570\u636e\u662f\u5426\u6ee1\u8db3\u6761\u4ef6\uff0c\u5219\u4f7f\u7528 BEFORE \u9009\u9879\uff1b\u82e5\u5e0c\u671b\u5728\u6fc0\u6d3b\u89e6\u53d1\u5668\u7684\u8bed\u53e5\u6267\u884c\u4e4b\u540e\u5b8c\u6210\u51e0\u4e2a\u6216\u66f4\u591a\u7684\u6539\u53d8\uff0c\u5219\u901a\u5e38\u4f7f\u7528 AFTER \u9009\u9879\u3002<\/p>\n\n\n\n<h5>4) \u8868\u540d<\/h5>\n\n\n\n<p>\u4e0e\u89e6\u53d1\u5668\u76f8\u5173\u8054\u7684\u8868\u540d\uff0c\u6b64\u8868\u5fc5\u987b\u662f\u6c38\u4e45\u6027\u8868\uff0c\u4e0d\u80fd\u5c06\u89e6\u53d1\u5668\u4e0e\u4e34\u65f6\u8868\u6216\u89c6\u56fe\u5173\u8054\u8d77\u6765\u3002\u5728\u8be5\u8868\u4e0a\u89e6\u53d1\u4e8b\u4ef6\u53d1\u751f\u65f6\u624d\u4f1a\u6fc0\u6d3b\u89e6\u53d1\u5668\u3002\u540c\u4e00\u4e2a\u8868\u4e0d\u80fd\u62e5\u6709\u4e24\u4e2a\u5177\u6709\u76f8\u540c\u89e6\u53d1\u65f6\u523b\u548c\u4e8b\u4ef6\u7684\u89e6\u53d1\u5668\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u4e00\u5f20\u6570\u636e\u8868\uff0c\u4e0d\u80fd\u540c\u65f6\u6709\u4e24\u4e2a BEFORE UPDATE \u89e6\u53d1\u5668\uff0c\u4f46\u53ef\u4ee5\u6709\u4e00\u4e2a BEFORE UPDATE \u89e6\u53d1\u5668\u548c\u4e00\u4e2a BEFORE INSERT \u89e6\u53d1\u5668\uff0c\u6216\u4e00\u4e2a BEFORE UPDATE \u89e6\u53d1\u5668\u548c\u4e00\u4e2a AFTER UPDATE \u89e6\u53d1\u5668\u3002<\/p>\n\n\n\n<h5>5) \u89e6\u53d1\u5668\u4e3b\u4f53<\/h5>\n\n\n\n<p>\u89e6\u53d1\u5668\u52a8\u4f5c\u4e3b\u4f53\uff0c\u5305\u542b\u89e6\u53d1\u5668\u6fc0\u6d3b\u65f6\u5c06\u8981\u6267\u884c\u7684 MySQL \u8bed\u53e5\u3002\u5982\u679c\u8981\u6267\u884c\u591a\u4e2a\u8bed\u53e5\uff0c\u53ef\u4f7f\u7528 BEGIN\u2026END \u590d\u5408\u8bed\u53e5\u7ed3\u6784\u3002<\/p>\n\n\n\n<h5>6) FOR EACH ROW<\/h5>\n\n\n\n<p>\u4e00\u822c\u662f\u6307\u884c\u7ea7\u89e6\u53d1\uff0c\u5bf9\u4e8e\u53d7\u89e6\u53d1\u4e8b\u4ef6\u5f71\u54cd\u7684\u6bcf\u4e00\u884c\u90fd\u8981\u6fc0\u6d3b\u89e6\u53d1\u5668\u7684\u52a8\u4f5c\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 INSERT \u8bed\u53e5\u5411\u67d0\u4e2a\u8868\u4e2d\u63d2\u5165\u591a\u884c\u6570\u636e\u65f6\uff0c\u89e6\u53d1\u5668\u4f1a\u5bf9\u6bcf\u4e00\u884c\u6570\u636e\u7684\u63d2\u5165\u90fd\u6267\u884c\u76f8\u5e94\u7684\u89e6\u53d1\u5668\u52a8\u4f5c\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u6ce8\u610f\uff1a\u6bcf\u4e2a\u8868\u90fd\u652f\u6301 INSERT\u3001UPDATE \u548c DELETE \u7684 BEFORE \u4e0e AFTER\uff0c\u56e0\u6b64\u6bcf\u4e2a\u8868\u6700\u591a\u652f\u6301 6 \u4e2a\u89e6\u53d1\u5668\u3002\u6bcf\u4e2a\u8868\u7684\u6bcf\u4e2a\u4e8b\u4ef6\u6bcf\u6b21\u53ea\u5141\u8bb8\u6709\u4e00\u4e2a\u89e6\u53d1\u5668\u3002\u5355\u4e00\u89e6\u53d1\u5668\u4e0d\u80fd\u4e0e\u591a\u4e2a\u4e8b\u4ef6\u6216\u591a\u4e2a\u8868\u5173\u8054\u3002<\/p><\/blockquote>\n\n\n\n<p>\u53e6\u5916\uff0c\u5728 MySQL \u4e2d\uff0c\u82e5\u9700\u8981\u67e5\u770b\u6570\u636e\u5e93\u4e2d\u5df2\u6709\u7684\u89e6\u53d1\u5668\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 SHOW TRIGGERS \u8bed\u53e5\u3002<\/p>\n\n\n\n<h3>9.3\u5220\u9664\u89e6\u53d1\u5668\u57fa\u672c\u8bed\u6cd5<\/h3>\n\n\n\n<p>\u4e0e\u5176\u4ed6 MySQL \u6570\u636e\u5e93\u5bf9\u8c61\u4e00\u6837\uff0c\u53ef\u4ee5\u4f7f\u7528 DROP \u8bed\u53e5\u5c06\u89e6\u53d1\u5668\u4ece\u6570\u636e\u5e93\u4e2d\u5220\u9664\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>DROP TRIGGER [ IF EXISTS ] [\u6570\u636e\u5e93\u540d] &lt;\u89e6\u53d1\u5668\u540d&gt;<\/p>\n\n\n\n<p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<h5>1) \u89e6\u53d1\u5668\u540d<\/h5>\n\n\n\n<p>\u8981\u5220\u9664\u7684\u89e6\u53d1\u5668\u540d\u79f0\u3002<\/p>\n\n\n\n<h5>2) \u6570\u636e\u5e93\u540d<\/h5>\n\n\n\n<p>\u53ef\u9009\u9879\u3002\u6307\u5b9a\u89e6\u53d1\u5668\u6240\u5728\u7684\u6570\u636e\u5e93\u7684\u540d\u79f0\u3002\u82e5\u6ca1\u6709\u6307\u5b9a\uff0c\u5219\u4e3a\u5f53\u524d\u9ed8\u8ba4\u7684\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n<h5>3) \u6743\u9650<\/h5>\n\n\n\n<p>\u6267\u884c DROP TRIGGER \u8bed\u53e5\u9700\u8981 SUPER \u6743\u9650\u3002<\/p>\n\n\n\n<h5>4) IF EXISTS<\/h5>\n\n\n\n<p>\u53ef\u9009\u9879\u3002\u907f\u514d\u5728\u6ca1\u6709\u89e6\u53d1\u5668\u7684\u60c5\u51b5\u4e0b\u5220\u9664\u89e6\u53d1\u5668\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u6ce8\u610f\uff1a\u5220\u9664\u4e00\u4e2a\u8868\u7684\u540c\u65f6\uff0c\u4e5f\u4f1a\u81ea\u52a8\u5220\u9664\u8be5\u8868\u4e0a\u7684\u89e6\u53d1\u5668\u3002\u53e6\u5916\uff0c\u89e6\u53d1\u5668\u4e0d\u80fd\u66f4\u65b0\u6216\u8986\u76d6\uff0c\u4e3a\u4e86\u4fee\u6539\u4e00\u4e2a\u89e6\u53d1\u5668\uff0c\u5fc5\u987b\u5148\u5220\u9664\u5b83\uff0c\u518d\u91cd\u65b0\u521b\u5efa\u3002<\/p><\/blockquote>\n\n\n\n<h3>9.4\u89e6\u53d1\u5668\u4e2d\u5173\u8054\u8868\u4e2d\u7684\u5217<\/h3>\n\n\n\n<p>\u200b \u5728MySQL\u89e6\u53d1\u5668\u4e2d\u7684SQL\u8bed\u53e5\u53ef\u4ee5\u5173\u8054\u8868\u4e2d\u7684\u4efb\u610f\u5217\u3002\u4f46\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u5217\u7684\u540d\u79f0\u53bb\u6807\u5fd7\uff0c\u90a3\u4f1a\u4f7f\u7cfb\u7edf\u6df7\u6dc6\uff0c\u56e0\u4e3a\u6fc0\u6d3b\u89e6\u53d1\u5668\u7684\u8bed\u53e5\u53ef\u80fd\u5df2\u7ecf\u4fee\u6539\u3001\u5220\u9664\u6216\u6dfb\u52a0\u4e86\u65b0\u7684\u5217\u540d\uff0c\u800c\u5217\u7684\u65e7\u540d\u540c\u65f6\u5b58\u5728\u3002\u56e0\u6b64\u5fc5\u987b\u7528\u8fd9\u6837\u7684\u8bed\u6cd5\u6765\u6807\u5fd7\uff1a\u201cNEW.column_name\u201d\u6216\u8005\u201cOLD.column_name\u201d\u3002<br>\u2460NEW.column_name\u7528\u6765\u5f15\u7528\u65b0\u884c\u7684\u4e00\u5217\uff0c<br>\u2461OLD.column_name\u7528\u6765\u5f15\u7528\u66f4\u65b0\u6216\u5220\u9664\u5b83\u4e4b\u524d\u7684\u5df2\u6709\u884c\u7684\u4e00\u5217\u3002<br>\u5bf9\u4e8eINSERT\u8bed\u53e5\uff0c\u53ea\u6709NEW\u662f\u5408\u6cd5\u7684\uff1b<br>\u2462 \u5bf9\u4e8eDELETE\u8bed\u53e5\uff0c\u53ea\u6709OLD\u624d\u5408\u6cd5\uff1b<br>\u2463\u800cUPDATE\u8bed\u53e5\u53ef\u4ee5\u4e0eNEW\u6216OLD\u540c\u65f6\u4f7f\u7528\u3002<\/p>\n\n\n\n<h3>9.5delete\u89e6\u53d1\u5668\u4f8b\u5b50<\/h3>\n\n\n\n<p>\u521b\u5efa\u89e6\u53d1\u5668\uff0c\u5728employee\u8868\u4e2d\u5220\u9664\u5458\u5de5\u4fe1\u606f\u7684\u540c\u65f6\u5c06salary\u8868\u4e2d\u8be5\u5458\u5de5\u7684\u4fe1\u606f\u5220\u9664\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u3002\u521b\u5efa\u5b8c\u540e\u5c1d\u8bd5\u5220\u9664employee\u8868\u4e2d\u7684\u4e00\u884c\u6570\u636e\uff0c\u7136\u540e\u67e5\u770bsalary\u8868\u4e2d\u7684\u53d8\u5316\u60c5\u51b5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>delimiter $$\ncreate trigger delete_emp_salaryInfo after delete  on employee for each row begin  delete from salary where salary.employeeID=employee.employeeID; end $$\ndelimiter ;<\/code><\/pre>\n\n\n\n<h3>9.6update\u89e6\u53d1\u5668<\/h3>\n\n\n\n<p>\u5f53\u4fee\u6539employee\u8868\u65f6\uff0c\u82e5\u5c06employee\u8868\u4e2d\u7684\u5458\u5de5\u5de5\u4f5c\u65f6\u95f4\u589e\u52a0\u4e00\u5e74\uff0c\u5219\u5c06\u6536\u5165\u589e\u52a0500\uff0c\u589e\u52a0\u4e24\u5e74\u5219\u6536\u5165\u589e\u52a01000\uff0c\u4ee5\u6b64\u7c7b\u63a8.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>delimiter $$\ncreate trigger update_salary_income after update on employee for each row begin update salary set income = income + 500 * (NEW.workYear -OLD.workYear) where NEW.employeeID = OLD.employeeID; end $$<\/code><\/pre>\n\n\n\n<h3>9.7\u4f8b\u5b50<\/h3>\n\n\n\n<h4>9.7.1\u521b\u5efa\u89e6\u53d1\u5668\uff0c\u5728employee\u8868\u4e2d\u5220\u9664\u5458\u5de5\u4fe1\u606f\u7684\u540c\u65f6\u5c06salary\u8868\u4e2d\u8be5\u5458\u5de5\u7684\u4fe1\u606f\u5220\u9664\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u3002\u521b\u5efa\u5b8c\u540e\u5c1d\u8bd5\u5220\u9664employee\u8868\u4e2d\u7684\u4e00\u884c\u6570\u636e\uff0c\u7136\u540e\u67e5\u770bsalary\u8868\u4e2d\u7684\u53d8\u5316\u60c5\u51b5<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>delimiter $$\n create trigger delete_emp_salaryInfo after delete  on employee for each row begin  delete from salary where salary.employeeID=employee.employeeID; end $$\ndelimiter ;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205033344186.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205033344186.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205033344192.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205033344192.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205033344263.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205033344263.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>9.7.2\u5f53\u4fee\u6539employee\u8868\u65f6\uff0c\u82e5\u5c06employee\u8868\u4e2d\u7684\u5458\u5de5\u5de5\u4f5c\u65f6\u95f4\u589e\u52a0\u4e00\u5e74\uff0c\u5219\u5c06\u6536\u5165\u589e\u52a0500\uff0c\u589e\u52a0\u4e24\u5e74\u5219\u6536\u5165\u589e\u52a01000\uff0c\u4ee5\u6b64\u7c7b\u63a8<\/h4>\n\n\n\n<p>delimiter $$<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>create trigger update_salary_income after update on employee for each row begin update salary set income = income + 500 * (NEW.workYear -OLD.workYear) where NEW.employeeID = OLD.employeeID; end $$\ndelimiter ;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205033500354.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205033500354.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205033500388.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205033500388.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<p>\u53ef\u89c1\uff0c\u5f53Employee\u4e2dEmployeeID = 102208\u7684workYear + 2\u65f6\uff0c\u5bf9\u5e94\u7684salary\u589e\u52a0\u4e861000.\u8bf4\u660e\u89e6\u53d1\u5668\u662f\u8d77\u4e86\u4f5c\u7528\u4e86\u3002<\/p>\n\n\n\n<p>9.8\u8be6\u7ec6\u7684\u5b9e\u9a8c\u8d44\u6599\u4ee5\u53ca\u6307\u5bfcPPT\u8bf7\u8bbf\u95ee\u7b14\u8005GitHub\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/LJF2402901363\/database_experiment.git\" target=\"_blank\"  rel=\"nofollow\" >https:\/\/github.com\/LJF2402901363\/database_experiment.git<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>9\u89e6\u53d1\u5668 9.1\u89e6\u53d1\u5668\u662f\u4ec0\u4e48 MySQL \u7684\u89e6\u53d1\u5668\u548c\u5b58\u50a8\u8fc7\u7a0b\u4e00\u6837\uff0c\u90fd\u662f\u5d4c\u5165\u5230 MySQL \u4e2d\u7684\u4e00\u6bb5\u7a0b\u5e8f\uff0c\u662f MySQL \u4e2d\u7ba1\u7406\u6570\u636e &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[120],"tags":[95,121,136],"_links":{"self":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/377"}],"collection":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/comments?post=377"}],"version-history":[{"count":2,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/377\/revisions"}],"predecessor-version":[{"id":396,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/377\/revisions\/396"}],"wp:attachment":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/media?parent=377"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/categories?post=377"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/tags?post=377"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}