{"id":876,"date":"2025-02-18T19:41:35","date_gmt":"2025-02-18T11:41:35","guid":{"rendered":"https:\/\/eve2333.top\/?p=876"},"modified":"2025-02-18T19:41:35","modified_gmt":"2025-02-18T11:41:35","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e5%85%a5%e9%97%a8%e5%88%b0%e5%a4%a7%e8%9b%87%e5%b0%9a%e7%a1%85%e8%b0%b7%e5%ae%8b%e7%ba%a2%e5%ba%b7%e8%80%81%e5%b8%88%e7%ac%94%e8%ae%b0-%e5%9f%ba%e7%a1%80%e7%af%87-p-13","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=876","title":{"rendered":"MySQL\u6570\u636e\u5e93\u5165\u95e8\u5230\u5927\u86c7\u5c1a\u7845\u8c37\u5b8b\u7ea2\u5eb7\u8001\u5e08\u7b14\u8bb0 \u57fa\u7840\u7bc7 part 17"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">&nbsp;\u7b2c17\u7ae0_\u89e6\u53d1\u5668<\/h1>\n\n\n\n<p>\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u8fd9\u6837\u7684\u60c5\u51b5\uff1a\u6709 2 \u4e2a\u6216\u8005\u591a\u4e2a\u76f8\u4e92\u5173\u8054\u7684\u8868\uff0c\u5982 \u5546\u54c1\u4fe1\u606f\u548c \u5e93\u5b58\u4fe1\u606f\u5206 \u522b\u5b58\u653e\u5728 2 \u4e2a\u4e0d\u540c\u7684\u6570\u636e\u8868\u4e2d\uff0c\u6211\u4eec\u5728\u6dfb\u52a0 insert \u4e00\u6761\u65b0\u5546\u54c1\u8bb0\u5f55\u7684\u65f6\u5019\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027\uff0c\u5fc5\u987b\u540c\u65f6 \u5728\u5e93\u5b58\u8868\u4e2d\u6dfb\u52a0\u4e00\u6761\u5e93\u5b58\u8bb0\u5f55\u3002<br>\u8fd9\u6837\u4e00\u6765\uff0c\u6211\u4eec\u5c31\u5fc5\u987b\u628a\u8fd9\u4e24\u4e2a\u5173\u8054\u7684\u64cd\u4f5c\u6b65\u9aa4\u5199\u5230\u7a0b\u5e8f\u91cc\u9762\uff0c\u800c\u4e14\u8981\u7528 \u4e8b\u52a1\u5305\u88f9\u8d77\u6765\uff0c\u786e\u4fdd\u8fd9\u4e24\u4e2a\u64cd\u4f5c\u6210\u4e3a\u4e00\u4e2a \u539f\u5b50\u64cd\u4f5c\uff08ACID\u7684 \u2019A\u2018 \u539f\u5b50\u6027\uff09\uff0c\u8981\u4e48\u5168\u90e8\u6267\u884c\uff0c\u8981\u4e48\u5168\u90e8\u4e0d\u6267\u884c\u3002\u8981\u662f\u9047\u5230\u7279\u6b8a\u60c5\u51b5\uff0c\u53ef\u80fd\u8fd8\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u624b \u52a8\u7ef4\u62a4\uff0c\u8fd9\u6837\u5c31\u5f88 \u5bb9\u6613\u5fd8\u8bb0\u5176\u4e2d\u7684\u4e00\u6b65\uff0c\u5bfc\u81f4\u6570\u636e\u7f3a\u5931\u3002<br>\u8fd9\u4e2a\u65f6\u5019\uff0c\u54b1\u4eec\u53ef\u4ee5\u4f7f\u7528\u89e6\u53d1\u5668\u3002\u4f60\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u89e6\u53d1\u5668\uff0c\u8ba9\u5546\u54c1\u4fe1\u606f\u6570\u636e\u7684\u63d2\u5165\u64cd\u4f5c\u81ea\u52a8\u89e6\u53d1\u5e93\u5b58\u6570 \u636e\u7684\u63d2\u5165\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">&nbsp;1. \u89e6\u53d1\u5668\u6982\u8ff0<\/h2>\n\n\n\n<p>MySQL\u7684\u89e6\u53d1\u5668\u548c\u5b58\u50a8\u8fc7\u7a0b\u4e00\u6837\uff0c\u90fd\u662f\u5d4c\u5165\u5230MySQL\u670d\u52a1\u5668\u7684\u4e00\u6bb5\u7a0b\u5e8f\u3002<\/p>\n\n\n\n<p>\u89e6\u53d1\u5668\u662f\u7531\u4e8b\u4ef6\u6765\u89e6\u53d1\u67d0\u4e2a\u64cd\u4f5c\uff0c\u8fd9\u4e9b\u4e8b\u4ef6\u5305\u62ec INSERT \u3001 UPDATE \u3001 DELETE \u4e8b\u4ef6\u3002\u6240\u8c13\u4e8b\u4ef6\u5c31\u662f\u6307 \u7528\u6237\u7684\u52a8\u4f5c\u6216\u8005\u89e6\u53d1\u67d0\u9879\u884c\u4e3a\u3002\u5982\u679c\u5b9a\u4e49\u4e86\u89e6\u53d1\u7a0b\u5e8f\uff0c\u5f53\u6570\u636e\u5e93\u6267\u884c\u8fd9\u4e9b\u8bed\u53e5\u65f6\u5019\uff0c\u5c31\u76f8\u5f53\u4e8e\u4e8b\u4ef6\u53d1\u751f\u4e86\uff0c\u5c31\u4f1a\u81ea\u52a8\u6fc0\u53d1\u89e6\u53d1\u5668\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u89e6\u53d1\u5668\u7684\u521b\u5efa<\/h2>\n\n\n\n<p>\u89e6\u53d1\u5668\u548c\u67d0\u4e00\u4e2a\u8868\u4e00\u5b9a\u662f\u6709\u4e00\u4e2a\u6df1\u5ea6\u7684\u8026\u5408\u7684\uff0c\u5373\u8026\u5408\u8868\uff0c&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TRIGGER \u89e6\u53d1\u5668\u540d\u79f0 \n{BEFORE|AFTER} {INSERT|UPDATE|DELETE} ON \u8868\u540d \nFOR EACH ROW \n\u89e6\u53d1\u5668\u6267\u884c\u7684\u8bed\u53e5\u5757;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8868\u540d\uff1a\u8868\u793a\u89e6\u53d1\u5668\u76d1\u63a7\u7684\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>BEFORE|AFTER \uff1a\u8868\u793a\u89e6\u53d1\u7684\u65f6\u95f4\u3002BEFORE \u8868\u793a\u5728\u4e8b\u4ef6\u4e4b\u524d\u89e6\u53d1\uff1bAFTER \u8868\u793a\u5728\u4e8b\u4ef6\u4e4b\u540e\u89e6\u53d1\u3002<\/li>\n\n\n\n<li>INSERT|UPDATE|DELETE \uff1a\u8868\u793a\u89e6\u53d1\u7684\u4e8b\u4ef6\u3002 INSERT \u8868\u793a\u63d2\u5165\u8bb0\u5f55\u65f6\u89e6\u53d1\uff1b UPDATE \u8868\u793a\u66f4\u65b0\u8bb0\u5f55\u65f6\u89e6\u53d1\uff1b DELETE \u8868\u793a\u5220\u9664\u8bb0\u5f55\u65f6\u89e6\u53d1\u3002<\/li>\n\n\n\n<li>\u89e6\u53d1\u5668\u6267\u884c\u7684\u8bed\u53e5\u5757\uff1a\u53ef\u4ee5\u662f\u5355\u6761SQL\u8bed\u53e5\uff0c\u4e5f\u53ef\u4ee5\u662f\u7531BEGIN\u2026END\u7ed3\u6784\u7ec4\u6210\u7684\u590d\u5408\u8bed\u53e5\u5757\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>#\u7b2c17\u7ae0_\u89e6\u53d1\u5668\n\n#0.\u51c6\u5907\u5de5\u4f5c\nCREATE DATABASE dbtest17;\n\nUSE dbtest17;\n\n#1. \u521b\u5efa\u89e6\u53d1\u5668\n\n#\u4e3e\u4f8b1\uff1a\n#\u2460 \u521b\u5efa\u6570\u636e\u8868\n\nCREATE TABLE test_trigger (\nid INT PRIMARY KEY AUTO_INCREMENT,\nt_note VARCHAR(30)\n);\n\n\nCREATE TABLE test_trigger_log (\nid INT PRIMARY KEY AUTO_INCREMENT,\nt_log VARCHAR(30)\n);\n\n#\u2461 \u67e5\u770b\u8868\u6570\u636e\nSELECT * FROM test_trigger;\n\nSELECT * FROM test_trigger_log;\n\n#\u2462 \u521b\u5efa\u89e6\u53d1\u5668\n#\u521b\u5efa\u540d\u79f0\u4e3abefore_insert_test_tri\u7684\u89e6\u53d1\u5668\uff0c\u5411test_trigger\u6570\u636e\u8868\u63d2\u5165\u6570\u636e\u4e4b\u524d\uff0c\n#\u5411test_trigger_log\u6570\u636e\u8868\u4e2d\u63d2\u5165before_insert\u7684\u65e5\u5fd7\u4fe1\u606f\u3002\n\nDELIMITER \/\/\n\nCREATE TRIGGER before_insert_test_tri\nBEFORE INSERT ON test_trigger\nFOR EACH ROW\nBEGIN\n\tINSERT INTO test_trigger_log(t_log)\n\tVALUES('before insert...');\nEND \/\/\n\nDELIMITER ;\n\n#\u2463 \u6d4b\u8bd5\nINSERT INTO test_trigger(t_note)\nVALUES('Tom...');\n\n\nSELECT * FROM test_trigger;\n\nSELECT * FROM test_trigger_log;<\/code><\/pre>\n\n\n\n<p><img loading=\"lazy\" decoding=\"async\" height=\"15\" src=\"blob:https:\/\/eve2333.top\/2218dba5-604c-4d4c-9b04-756734ab4db7\" width=\"15\"><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#\u4e3e\u4f8b2\uff1a\n#\u521b\u5efa\u540d\u79f0\u4e3aafter_insert_test_tri\u7684\u89e6\u53d1\u5668\uff0c\u5411test_trigger\u6570\u636e\u8868\u63d2\u5165\u6570\u636e\u4e4b\u540e\uff0c\n#\u5411test_trigger_log\u6570\u636e\u8868\u4e2d\u63d2\u5165after_insert\u7684\u65e5\u5fd7\u4fe1\u606f\u3002\n\nDELIMITER $\n\nCREATE TRIGGER after_insert_test_tri\nAFTER INSERT ON test_trigger\nFOR EACH ROW\nBEGIN\n\tINSERT INTO test_trigger_log(t_log)\n\tVALUES('after insert...');\nEND $\n\nDELIMITER ;\n\n#\u6d4b\u8bd5\nINSERT INTO test_trigger(t_note)\nVALUES('Jerry2...');\n\nSELECT * FROM test_trigger;\n\nSELECT * FROM test_trigger_log;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>#\u4e3e\u4f8b3\uff1a\n#\u5b9a\u4e49\u89e6\u53d1\u5668\u201csalary_check_trigger\u201d\uff0c\u57fa\u4e8e\u5458\u5de5\u8868\u201cemployees\u201d\u7684INSERT\u4e8b\u4ef6\uff0c\n#\u5728INSERT\u4e4b\u524d\u68c0\u67e5\u5c06\u8981\u6dfb\u52a0\u7684\u65b0\u5458\u5de5\u85aa\u8d44\u662f\u5426\u5927\u4e8e\u4ed6\u9886\u5bfc\u7684\u85aa\u8d44\uff0c\u5982\u679c\u5927\u4e8e\u9886\u5bfc\u85aa\u8d44\uff0c\n#\u5219\u62a5sqlstate_value\u4e3a'HY000'\u7684\u9519\u8bef\uff0c\u4ece\u800c\u4f7f\u5f97\u6dfb\u52a0\u5931\u8d25\u3002\n\n#\u51c6\u5907\u5de5\u4f5c\nCREATE TABLE employees\nAS\nSELECT * FROM atguigudb.`employees`;\n\n\nCREATE TABLE departments\nAS\nSELECT * FROM atguigudb.`departments`;\n\nDESC employees;\n\n#\u521b\u5efa\u89e6\u53d1\u5668\nDELIMITER \/\/\n\nCREATE TRIGGER salary_check_trigger\nBEFORE INSERT ON employees\nFOR EACH ROW\nBEGIN\n\t#\u67e5\u8be2\u5230\u8981\u6dfb\u52a0\u7684\u6570\u636e\u7684manager\u7684\u85aa\u8d44\n\tDECLARE mgr_sal DOUBLE;\n\t\n\tSELECT salary INTO mgr_sal FROM employees \n\tWHERE employee_id = NEW.manager_id;\n\t\n\tIF NEW.salary &gt; mgr_sal\n\t\tTHEN SIGNAL SQLSTATE 'HY000' SET MESSAGE_TEXT = '\u85aa\u8d44\u9ad8\u4e8e\u9886\u5bfc\u85aa\u8d44\u9519\u8bef';\n\tEND IF;\n\nEND \/\/\n\nDELIMITER ;\n\n#\u6d4b\u8bd5\nDESC employees;\n\n#\u6dfb\u52a0\u6210\u529f\uff1a\u4f9d\u7136\u89e6\u53d1\u4e86\u89e6\u53d1\u5668salary_check_trigger\u7684\u6267\u884c\nINSERT INTO employees(employee_id,last_name,email,hire_date,job_id,salary,manager_id)\nVALUES(300,'Tom','tom@126.com',CURDATE(),'AD_VP',8000,103);\n\n#\u6dfb\u52a0\u5931\u8d25\nINSERT INTO employees(employee_id,last_name,email,hire_date,job_id,salary,manager_id)\nVALUES(301,'Tom1','tom1@126.com',CURDATE(),'AD_VP',10000,103);\n\nSELECT * FROM employees;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u67e5\u770b\u3001\u5220\u9664\u89e6\u53d1\u5668<\/h2>\n\n\n\n<p>\u67e5\u770b\u89e6\u53d1\u5668\u662f\u67e5\u770b\u6570\u636e\u5e93\u4e2d\u5df2\u7ecf\u5b58\u5728\u7684\u89e6\u53d1\u5668\u7684\u5b9a\u4e49\u3001\u72b6\u6001\u548c\u8bed\u6cd5\u4fe1\u606f\u7b49\u3002<br>\u65b9\u5f0f1\uff1a\u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u7684\u6240\u6709\u89e6\u53d1\u5668\u7684\u5b9a\u4e49<br>&nbsp; &nbsp; SHOW TRIGGERS\\G<\/p>\n\n\n\n<p>\u65b9\u5f0f2\uff1a\u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u67d0\u4e2a\u89e6\u53d1\u5668\u7684\u5b9a\u4e49<br>&nbsp; &nbsp; SHOW CREATE TRIGGER \u89e6\u53d1\u5668\u540d<\/p>\n\n\n\n<p>\u65b9\u5f0f3\uff1a\u4ece\u7cfb\u7edf\u5e93information_schema\u7684TRIGGERS\u8868\u4e2d\u67e5\u8be2\u201csalary_check_trigger\u201d\u89e6\u53d1\u5668\u7684\u4fe1\u606f\u3002<br>&nbsp; &nbsp; SELECT * FROM information_schema.TRIGGERS;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 \u5220\u9664\u89e6\u53d1\u5668<\/h3>\n\n\n\n<p>\u89e6\u53d1\u5668\u4e5f\u662f\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5220\u9664\u89e6\u53d1\u5668\u4e5f\u7528DROP\u8bed\u53e5\uff0c\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<br>&nbsp; &nbsp; DROP TRIGGER IF EXISTS \u89e6\u53d1\u5668\u540d\u79f0;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#2. \u67e5\u770b\u89e6\u53d1\u5668\n#\u2460 \u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u7684\u6240\u6709\u89e6\u53d1\u5668\u7684\u5b9a\u4e49\nSHOW TRIGGERS;\n\n#\u2461 \u65b9\u5f0f2\uff1a\u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u67d0\u4e2a\u89e6\u53d1\u5668\u7684\u5b9a\u4e49\nSHOW CREATE TRIGGER salary_check_trigger;\n\n#\u2462 \u65b9\u5f0f3\uff1a\u4ece\u7cfb\u7edf\u5e93information_schema\u7684TRIGGERS\u8868\u4e2d\u67e5\u8be2\u201csalary_check_trigger\u201d\u89e6\u53d1\u5668\u7684\u4fe1\u606f\u3002\nSELECT * FROM information_schema.TRIGGERS;\n\n\n#3. \u5220\u9664\u89e6\u53d1\u5668\nDROP TRIGGER IF EXISTS after_insert_test_tri;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u89e6\u53d1\u5668\u7684\u4f18\u7f3a\u70b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 \u4f18\u70b9<\/h3>\n\n\n\n<p>1\u3001\u89e6\u53d1\u5668\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002 \u5047\u8bbe\u6211\u4eec\u7528 \u8fdb\u8d27\u5355\u5934\u8868\uff08demo.importhead\uff09\u6765\u4fdd\u5b58\u8fdb\u8d27\u5355\u7684\u603b\u4f53\u4fe1\u606f\uff0c\u5305\u62ec\u8fdb\u8d27\u5355\u7f16\u53f7\u3001\u4f9b\u8d27\u5546\u7f16 \u53f7\u3001\u4ed3\u5e93\u7f16\u53f7\u3001\u603b\u8ba1\u8fdb\u8d27\u6570\u91cf\u3001\u603b\u8ba1\u8fdb\u8d27\u91d1\u989d\u548c\u9a8c\u6536\u65e5\u671f\u3002<img loading=\"lazy\" decoding=\"async\" height=\"450\" width=\"686\" src=\"https:\/\/i-blog.csdnimg.cn\/direct\/fc8e618a742f4e9a9bd215dac5218b82.png\" alt=\"\"><\/p>\n\n\n\n<p>\u6bcf\u5f53\u6211\u4eec\u5f55\u5165\u3001\u5220\u9664\u548c\u4fee\u6539\u4e00\u6761\u8fdb\u8d27\u5355\u660e\u7ec6\u6570\u636e\u7684\u65f6\u5019\uff0c\u8fdb\u8d27\u5355\u660e\u7ec6\u8868\u91cc\u7684\u6570\u636e\u5c31\u4f1a\u53d1\u751f\u53d8\u52a8\u3002\u8fd9\u4e2a\u65f6 \u5019\uff0c\u5728\u8fdb\u8d27\u5355\u5934\u8868\u4e2d\u7684\u603b\u8ba1\u6570\u91cf\u548c\u603b\u8ba1\u91d1\u989d\u5c31\u5fc5\u987b\u91cd\u65b0\u8ba1\u7b97\uff0c\u5426\u5219\uff0c\u8fdb\u8d27\u5355\u5934\u8868\u4e2d\u7684\u603b\u8ba1\u6570\u91cf\u548c\u603b\u8ba1\u91d1\u989d\u5c31\u4e0d\u7b49\u4e8e\u8fdb\u8d27\u5355\u660e\u7ec6\u8868\u4e2d\u6570\u91cf\u5408\u8ba1\u548c\u91d1\u989d\u5408\u8ba1\u4e86\uff0c\u8fd9\u5c31\u662f\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/p>\n\n\n\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528\u89e6\u53d1\u5668\uff0c\u89c4\u5b9a\u6bcf\u5f53\u8fdb\u8d27\u5355\u660e\u7ec6\u8868\u6709\u6570\u636e\u63d2\u5165\u3001\u4fee\u6539\u548c\u5220\u9664\u7684\u64cd\u4f5c\u65f6\uff0c\u81ea\u52a8\u89e6\u53d12\u6b65\u64cd\u4f5c\uff1a&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1\uff09\u91cd\u65b0\u8ba1\u7b97\u8fdb\u8d27\u5355\u660e\u7ec6\u8868\u4e2d\u7684\u6570\u91cf\u5408\u8ba1\u548c\u91d1\u989d\u5408\u8ba1\uff1b<\/li>\n\n\n\n<li>2\uff09\u7528\u7b2c\u4e00\u6b65\u4e2d\u8ba1\u7b97\u51fa\u6765\u7684\u503c\u66f4\u65b0\u8fdb\u8d27\u5355\u5934\u8868\u4e2d\u7684\u5408\u8ba1\u6570\u91cf\u4e0e\u5408\u8ba1\u91d1\u989d\u3002 \u8fd9\u6837\u4e00\u6765\uff0c\u8fdb\u8d27\u5355\u5934\u8868\u4e2d\u7684\u5408\u8ba1\u6570\u91cf\u4e0e\u5408\u8ba1\u91d1\u989d\u7684\u503c\uff0c\u5c31\u59cb\u7ec8\u4e0e\u8fdb\u8d27\u5355\u660e\u7ec6\u8868\u4e2d\u8ba1\u7b97\u51fa\u6765\u7684\u5408\u8ba1\u6570\u91cf\u4e0e \u5408\u8ba1\u91d1\u989d\u7684\u503c\u76f8\u540c\uff0c\u6570\u636e\u5c31\u662f\u4e00\u81f4\u7684\uff0c\u4e0d\u4f1a\u4e92\u76f8\u77db\u76fe\u3002<\/li>\n<\/ul>\n\n\n\n<p>2\u3001\u89e6\u53d1\u5668\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u8bb0\u5f55\u64cd\u4f5c\u65e5\u5fd7\u3002 \u5229\u7528\u89e6\u53d1\u5668\uff0c\u53ef\u4ee5\u5177\u4f53\u8bb0\u5f55\u4ec0\u4e48\u65f6\u95f4\u53d1\u751f\u4e86\u4ec0\u4e48\u3002\u6bd4\u5982\uff0c\u8bb0\u5f55\u4fee\u6539\u4f1a\u5458\u50a8\u503c\u91d1\u989d\u7684\u89e6\u53d1\u5668\uff0c\u5c31\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u4f8b\u5b50\u3002\u8fd9\u5bf9\u6211\u4eec\u8fd8\u539f\u64cd\u4f5c\u6267\u884c\u65f6\u7684\u5177\u4f53\u573a\u666f\uff0c\u66f4\u597d\u5730\u5b9a\u4f4d\u95ee\u9898\u539f\u56e0\u5f88\u6709\u5e2e\u52a9\u3002<\/p>\n\n\n\n<p>3\u3001\u89e6\u53d1\u5668\u8fd8\u53ef\u4ee5\u7528\u5728\u64cd\u4f5c\u6570\u636e\u524d\uff0c\u5bf9\u6570\u636e\u8fdb\u884c\u5408\u6cd5\u6027\u68c0\u67e5\u3002 \u6bd4\u5982\uff0c\u8d85\u5e02\u8fdb\u8d27\u7684\u65f6\u5019\uff0c\u9700\u8981\u5e93\u7ba1\u5f55\u5165\u8fdb\u8d27\u4ef7\u683c\u3002\u4f46\u662f\uff0c\u4eba\u4e3a\u64cd\u4f5c\u5f88\u5bb9\u6613\u72af\u9519\u8bef\uff0c\u6bd4\u5982\u8bf4\u5728\u5f55\u5165\u6570\u91cf\u7684\u65f6\u5019\uff0c\u628a\u6761\u5f62\u7801\u626b\u8fdb\u53bb\u4e86\uff1b\u5f55\u5165\u91d1\u989d\u7684\u65f6\u5019\uff0c\u770b\u4e32\u4e86\u884c\uff0c\u5f55\u5165\u7684\u4ef7\u683c\u8fdc\u8d85\u552e\u4ef7\uff0c\u5bfc\u81f4\u8d26\u9762\u4e0a\u7684\u5de8\u4e8f\u2026\u2026 \u8fd9\u4e9b\u90fd\u53ef\u4ee5\u901a\u8fc7\u89e6\u53d1\u5668\uff0c\u5728\u5b9e\u9645\u63d2\u5165\u6216\u8005\u66f4\u65b0\u64cd\u4f5c\u4e4b\u524d\uff0c\u5bf9\u76f8\u5e94\u7684\u6570\u636e\u8fdb\u884c\u68c0\u67e5\uff0c\u53ca\u65f6\u63d0\u793a\u9519\u8bef\uff0c\u9632\u6b62\u9519\u8bef\u6570\u636e\u8fdb\u5165\u7cfb\u7edf\u3002&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.2 \u7f3a\u70b9<\/h3>\n\n\n\n<p>\u6bd4\u5982\u8bf4\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u89e6\u53d1\u5668\uff0cbegin end\u4e2d\u5199\u4e86\u4e00\u4e2avalue\u5b57\u7b26\u4e32\u7279\u522b\u7684\u957f\uff0c40\u4e2a\u5b57\u7b26\uff0c\u5f53\u6211\u4eec\u6d4b\u8bd5\u65f6\u6dfb\u52a0\u8bb0\u5f55\u7684\u65f6\u5019\uff0c<\/p>\n\n\n\n<p>1. \u89e6\u53d1\u5668\u6700\u5927\u7684\u4e00\u4e2a\u95ee\u9898\u5c31\u662f\u53ef\u8bfb\u6027\u5dee\u3002<br>\u56e0\u4e3a\u89e6\u53d1\u5668\u5b58\u50a8\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u5e76\u4e14\u7531\u4e8b\u4ef6\u9a71\u52a8\uff0c\u8fd9\u5c31\u610f\u5473\u7740\u89e6\u53d1\u5668\u6709\u53ef\u80fd \u4e0d\u53d7\u5e94\u7528\u5c42\u7684\u63a7\u5236\u3002\u8fd9\u5bf9\u7cfb\u7edf\u7ef4\u62a4\u662f\u975e\u5e38\u6709\u6311\u6218\u7684\u3002<br>\u6bd4\u5982\uff0c\u521b\u5efa\u89e6\u53d1\u5668\u7528\u4e8e\u4fee\u6539\u4f1a\u5458\u50a8\u503c\u64cd\u4f5c\u3002\u5982\u679c\u89e6\u53d1\u5668\u4e2d\u7684\u64cd\u4f5c\u51fa\u4e86\u95ee\u9898\uff0c\u4f1a\u5bfc\u81f4\u4f1a\u5458\u50a8\u503c\u91d1\u989d\u66f4\u65b0\u5931\u8d25\u3002\u6211\u7528\u4e0b\u9762\u7684\u4ee3\u7801\u6f14\u793a\u4e00\u4e0b\uff1a<\/p>\n\n\n\n<p>mysql&gt; update demo.membermaster set memberdeposit=20 where memberid = 2;<br>ERROR 1054 (42S22): Unknown column 'aa' in 'field list'<\/p>\n\n\n\n<p>\u7ed3\u679c\u663e\u793a\uff0c\u7cfb\u7edf\u63d0\u793a\u9519\u8bef\uff0c\u5b57\u6bb5\u201caa\u201d\u4e0d\u5b58\u5728\u3002<br>\u8fd9\u662f\u56e0\u4e3a\uff0c\u89e6\u53d1\u5668\u4e2d\u7684\u6570\u636e\u63d2\u5165\u64cd\u4f5c\u591a\u4e86\u4e00\u4e2a\u5b57\u6bb5\uff0c\u7cfb\u7edf\u63d0\u793a\u9519\u8bef\u3002\u53ef\u662f\uff0c\u5982\u679c\u4f60\u4e0d\u4e86\u89e3\u8fd9\u4e2a\u89e6\u53d1\u5668\uff0c\u5f88\u53ef\u80fd\u4f1a\u8ba4\u4e3a\u662f\u66f4\u65b0\u8bed\u53e5\u672c\u8eab\u7684\u95ee\u9898\uff0c\u6216\u8005\u662f\u4f1a\u5458\u4fe1\u606f\u8868\u7684\u7ed3\u6784\u51fa\u4e86\u95ee\u9898\u3002\u8bf4\u4e0d\u5b9a\u4f60\u8fd8\u4f1a\u7ed9\u4f1a\u5458\u4fe1\u606f\u8868\u6dfb\u52a0\u4e00\u4e2a\u53eb\u201caa\u201d\u7684\u5b57\u6bb5\uff0c\u8bd5\u56fe\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u7ed3\u679c\u53ea\u80fd\u662f\u767d\u8d39\u529b\u3002<\/p>\n\n\n\n<p>2. \u76f8\u5173\u6570\u636e\u7684\u53d8\u66f4\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89e6\u53d1\u5668\u51fa\u9519\u3002<br>\u7279\u522b\u662f\u6570\u636e\u8868\u7ed3\u6784\u7684\u53d8\u66f4\uff0c\u90fd\u53ef\u80fd\u4f1a\u5bfc\u81f4\u89e6\u53d1\u5668\u51fa\u9519\uff0c\u8fdb\u800c\u5f71\u54cd\u6570\u636e\u64cd\u4f5c\u7684\u6b63\u5e38\u8fd0\u884c\u3002\u8fd9\u4e9b\u90fd\u4f1a\u7531\u4e8e\u89e6\u53d1\u5668\u672c\u8eab\u7684\u9690\u853d\u6027\uff0c\u5f71\u54cd\u5230\u5e94\u7528\u4e2d\u9519\u8bef\u539f\u56e0\u6392\u67e5\u7684\u6548\u7387\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.3\u6ce8\u610f<\/h3>\n\n\n\n<p>\u6ce8\u610f\uff0c\u5982\u679c\u5728\u5b50\u8868\u4e2d\u5b9a\u4e49\u4e86\u5916\u952e\u7ea6\u675f\uff0c\u5e76\u4e14\u5916\u952e\u6307\u5b9a\u4e86ON UPDATE\/DELETE CASCADE\/SET NULL\u5b50\u53e5\uff0c\u6b64 \u65f6\u4fee\u6539\u7236\u8868\u88ab\u5f15\u7528\u7684\u952e\u503c\u6216\u5220\u9664\u7236\u8868\u88ab\u5f15\u7528\u7684\u8bb0\u5f55\u884c\u65f6\uff0c\u4e5f\u4f1a\u5f15\u8d77\u5b50\u8868\u7684\u4fee\u6539\u548c\u5220\u9664\u64cd\u4f5c\uff0c\u6b64\u65f6\u57fa\u4e8e\u5b50 \u8868\u7684UPDATE\u548cDELETE\u8bed\u53e5\u5b9a\u4e49\u7684\u89e6\u53d1\u5668\u5e76\u4e0d\u4f1a\u88ab\u6fc0\u6d3b\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/www.bilibili.com\/video\/BV1iq4y1u7vj?t=1005.8&amp;p=93\" target=\"_blank\"  rel=\"nofollow\" >93-\u67e5\u770b\u5220\u9664\u89e6\u53d1\u5668_\u89e6\u53d1\u5668\u8bfe\u540e\u7ec3\u4e60_\u54d4\u54e9\u54d4\u54e9_bilibili<\/a>\u662f\u4e00\u6bb5\u8bb2\u89e3<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u8bfe\u540e\u7ec3\u4e60<\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code>#\u7b2c17\u7ae0_\u89e6\u53d1\u5668\u7684\u8bfe\u540e\u7ec3\u4e60\n\n#\u7ec3\u4e601\uff1a\n\n#0. \u51c6\u5907\u5de5\u4f5c\n\nCREATE DATABASE test17_trigger;\n\nUSE test17_trigger;\n\nCREATE TABLE emps\nAS\nSELECT employee_id,last_name,salary\nFROM atguigudb.`employees`;\n\nSELECT * FROM emps;\n\n#1. \u590d\u5236\u4e00\u5f20emps\u8868\u7684\u7a7a\u8868emps_back\uff0c\u53ea\u6709\u8868\u7ed3\u6784\uff0c\u4e0d\u5305\u542b\u4efb\u4f55\u6570\u636e\n\nCREATE TABLE emps_back\nAS\nSELECT * FROM emps\nWHERE 1 = 2;\n\n\n#2. \u67e5\u8be2emps_back\u8868\u4e2d\u7684\u6570\u636e\nSELECT * FROM emps_back;\n\n\n#3. \u521b\u5efa\u89e6\u53d1\u5668emps_insert_trigger\uff0c\u6bcf\u5f53\u5411emps\u8868\u4e2d\u6dfb\u52a0\u4e00\u6761\u8bb0\u5f55\u65f6\uff0c\u540c\u6b65\u5c06\u8fd9\u6761\u8bb0\u5f55\n#\u6dfb\u52a0\u5230emps_back\u8868\u4e2d\n\nDELIMITER \/\/\n\nCREATE TRIGGER emps_insert_trigger\nAFTER INSERT ON emps\nFOR EACH ROW\nBEGIN\n\t#\u5c06\u65b0\u6dfb\u52a0\u5230emps\u8868\u4e2d\u7684\u8bb0\u5f55\u6dfb\u52a0\u5230emps_back\u8868\u4e2d\n\tINSERT INTO emps_back(employee_id,last_name,salary)\n\tVALUES(NEW.employee_id,NEW.last_name,NEW.salary);\nEND \/\/\n\nDELIMITER ;\n\n#show triggers;\n\n\n#4. \u9a8c\u8bc1\u89e6\u53d1\u5668\u662f\u5426\u8d77\u4f5c\u7528\nSELECT * FROM emps;\n\nSELECT * FROM emps_back;\n\nINSERT INTO emps(employee_id,last_name,salary)\nVALUES(301,'Tom1',3600);\n\n\n#\u7ec3\u4e602\uff1a\n#0. \u51c6\u5907\u5de5\u4f5c\uff1a\u4f7f\u7528\u7ec3\u4e601\u4e2d\u7684emps\u8868\n\n#1. \u590d\u5236\u4e00\u5f20emps\u8868\u7684\u7a7a\u8868emps_back1\uff0c\u53ea\u6709\u8868\u7ed3\u6784\uff0c\u4e0d\u5305\u542b\u4efb\u4f55\u6570\u636e\n\nCREATE TABLE emps_back1\nAS\nSELECT * \nFROM emps\nWHERE 1 = 2;\n\n\n#2. \u67e5\u8be2emps_back1\u8868\u4e2d\u7684\u6570\u636e\n\nSELECT * FROM emps_back1;\n\n\n#3. \u521b\u5efa\u89e6\u53d1\u5668emps_del_trigger\uff0c\u6bcf\u5f53\u5411emps\u8868\u4e2d\u5220\u9664\u4e00\u6761\u8bb0\u5f55\u65f6\uff0c\u540c\u6b65\u5c06\u5220\u9664\u7684\u8fd9\u6761\u8bb0\u5f55\u6dfb\u52a0\u5230emps_back1\u8868\u4e2d\n\nDELIMITER \/\/\n\nCREATE TRIGGER emps_del_trigger\nBEFORE DELETE ON emps\nFOR EACH ROW\nBEGIN\n\t#\u5c06emps\u8868\u4e2d\u5220\u9664\u7684\u8bb0\u5f55\uff0c\u6dfb\u52a0\u5230emps_back1\u8868\u4e2d\u3002\n\tINSERT INTO emps_back1(employee_id,last_name,salary)\n\tVALUES(OLD.employee_id,OLD.last_name,OLD.salary);\nEND \/\/\n\nDELIMITER ;\n\n\n#4. \u9a8c\u8bc1\u89e6\u53d1\u5668\u662f\u5426\u8d77\u4f5c\u7528\n\nDELETE FROM emps\nWHERE employee_id = 101;\n\n\nDELETE FROM emps;\n\nSELECT * FROM emps;\n\n\nSELECT * FROM emps_back1;<img loading=\"lazy\" decoding=\"async\" height=\"15\" width=\"15\" src=\"blob:https:\/\/eve2333.top\/21ce4e48-dbad-4ecf-8808-a6c5233d19bd\"><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp;\u7b2c17\u7ae0_\u89e6\u53d1\u5668 \u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u8fd9\u6837\u7684\u60c5\u51b5\uff1a\u6709 2 \u4e2a\u6216\u8005\u591a\u4e2a\u76f8\u4e92\u5173\u8054\u7684\u8868\uff0c\u5982 \u5546\u54c1\u4fe1\u606f\u548c \u5e93\u5b58\u4fe1\u606f\u5206  &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[2],"tags":[16],"class_list":["post-876","post","type-post","status-publish","format-standard","hentry","category-2","tag-sql"],"_links":{"self":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/876","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=876"}],"version-history":[{"count":1,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/876\/revisions"}],"predecessor-version":[{"id":877,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/876\/revisions\/877"}],"wp:attachment":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=876"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=876"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}