{"id":5777,"date":"2024-04-15T17:14:16","date_gmt":"2024-04-15T09:14:16","guid":{"rendered":"http:\/\/zyg.luchers.cn\/?p=5777"},"modified":"2024-04-15T17:14:16","modified_gmt":"2024-04-15T09:14:16","slug":"%e7%ac%ac%e4%ba%94%e7%ab%a0%e3%80%81%e6%95%b0%e6%8d%ae%e5%ba%93%e5%ae%8c%e6%95%b4%e6%80%a7","status":"publish","type":"post","link":"http:\/\/zyg.luchers.cn\/index.php\/2024\/04\/15\/%e7%ac%ac%e4%ba%94%e7%ab%a0%e3%80%81%e6%95%b0%e6%8d%ae%e5%ba%93%e5%ae%8c%e6%95%b4%e6%80%a7\/","title":{"rendered":"\u7b2c\u4e94\u7ae0\u3001\u6570\u636e\u5e93\u5b8c\u6574\u6027"},"content":{"rendered":"

\u7b2c\u4e94\u7ae0\u3001\u6570\u636e\u5e93\u5b8c\u6574\u6027<\/h1>\n

\u4ecb\u7ecd<\/h3>\n

1\u3001\u6570\u636e\u5e93\u5b8c\u6574\u6027\u4ecb\u7ecd<\/h4>\n

1\u3001\u6570\u636e\u5e93\u7684\u5b8c\u6574\u6027\uff1a\u968f\u673a\u6570\u7684\u6b63\u786e\u6027\u3001\u76f8\u5bb9\u6027<\/p>\n

2\u3001\u6570\u636e\u7684\u6b63\u786e\u6027\uff1a\u6570\u636e\u662f\u5426\u7b26\u5408\u73b0\u5b9e\u65f6\u95f4\u8bed\u4e49<\/p>\n

3\u3001\u6570\u636e\u7684\u76f8\u5bb9\u6027\uff1a\u6570\u636e\u5e93\u540c\u4e00\u5bf9\u8c61\u5728\u4e0d\u540c\u5173\u7cfb\u8868\u4e2d\u7684\u6570\u636e\u662f\u7b26\u5408\u903b\u8f91\u7684<\/p>\n

4\u3001\u5e0c\u671b\u5efa\u7acb\u8868\u7684\u65f6\u5019\uff0c\u5c31\u62e5\u6709\u6570\u636e\u7684\u5b8c\u6574\u6027<\/p>\n

2\u3001\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u5b89\u5168\u6027\u7684\u6982\u5ff5<\/h4>\n

1\u3001\u6570\u636e\u7684\u5b8c\u6574\u6027<\/h5>\n

1\u3001\u9632\u6b62\u6570\u636e\u5e93\u62e5\u6709\u4e0d\u7b26\u5408\u8bed\u4e49\u6570\u636e\uff0c\u9632\u6b62\u6570\u636e\u5e93\u5b58\u50a8\u4e0d\u6b63\u786e\u7684\u6570\u636e<\/p>\n

2\u3001\u9632\u8303\u5bf9\u8c61\uff1a\u4e0d\u7b26\u5408\u8bed\u4e49\u3001\u4e0d\u6b63\u786e\u7684\u6570\u636e<\/p>\n

2\u3001\u6570\u636e\u7684\u5b89\u5168\u6027<\/h5>\n

1\u3001\u4e0d\u4f1a\u6570\u636e\u5e93\u88ab\u6076\u610f\u7834\u574f\u3001\u975e\u6cd5\u5b58\u53d6<\/p>\n

2\u3001\u9632\u8303\u5bf9\u8c61\uff1a\u975e\u6cd5\u7528\u6237\u548c\u975e\u6cd5\u64cd\u4f5c<\/p>\n

3\u3001\u6570\u636e\u5e93\u5b8c\u6574\u6027\u5e94\u5177\u5907\u7684\u529f\u80fd<\/h4>\n

1\u3001\u63d0\u9ad8\u5b9a\u4e49\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6\u673a\u5236<\/h5>\n

1\u3001\u4e5f\u53eb\u5b8c\u6574\u6027\u89c4\u5219\uff0c\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u5fc5\u987b\u6ee1\u8db3\u8bed\u4e49\u7ea6\u675f\u6761\u4ef6<\/p>\n

2\u3001\u63d0\u4f9b\u5b8c\u6574\u6027\u68c0\u67e5\u7684\u65b9\u6cd5<\/h5>\n

1\u3001\u4e00\u822c\u5728INSERT\u3001UPDATE\u3001DELETE\u8bed\u53e5\u6267\u884c\u540e\u8fdb\u884c\u68c0\u67e5<\/p>\n

2\u3001\u4e5f\u53ef\u4ee5\u5728\u4e8b\u52a1\u63d0\u4ea4\u65f6\u68c0\u67e5<\/p>\n

3\u3001\u8fdd\u7ea6\u5904\u7406<\/h5>\n

1\u3001\u91c7\u7528\u62d2\u7edd(NO ACTION)\u6267\u884c\u8be5\u64cd\u4f5c<\/p>\n

2\u3001\u6216\u7ea7\u8fde(CASCADE)\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\u7b49\u65b9\u5f0f\u4fdd\u8bc1\u5b8c\u6574\u6027\uff08\u4e00\u4e2a\u6570\u636e\u88ab\u4fee\u6539\uff0c\u5176\u4ed6\u76f8\u5173\u6570\u636e\u9875\u548c\u8be5\u6570\u636e\u5173\u7cfb\u76f8\u8fde\u5bf9\u5e94\uff09<\/p>\n

3\u3001DELETE\u8bed\u53e5\u7684\u65f6\u5019\uff0c\u6570\u636e\u5e93\u7cfb\u7edf\u53ef\u80fd\u4f1a\u7ed9\u5b9aNULL<\/p>\n

5.1\u3001\u5b9e\u4f53\u5b8c\u6574\u6027<\/h2>\n

5.1.1\u3001\u5b9e\u4f53\u5b8c\u6574\u6027\u5b9a\u4e49<\/h3>\n

1\u3001\u5173\u7cfb\u6a21\u578b\u7684\u5b9e\u4f53\u5b8c\u6574\u6027<\/h4>\n

1\u3001\u8bbe\u7f6e\u4e3b\u7801\uff0c\u7528\u6765\u6570\u636e\u533a\u5206<\/p>\n

2\u3001SQL\u8bed\u6cd5\uff1aPRIMARY KEY<\/p>\n

2\u3001\u4e3b\u7801\u662f\u5355\u5c5e\u6027\u6784\u6210\u7684\u6709\u4e24\u79cd\u8bf4\u660e\u65b9\u6cd5<\/h4>\n

1\u3001\u5b9a\u4e49\u4e3a\u5217\u7ea7\u7ea6\u675f\u6761\u4ef6<\/p>\n

2\u3001\u5b9a\u4e49\u8868\u7ea7\u7ea6\u675f\u6761\u4ef6\uff08\u5728\u4e00\u4e2a\u8868\u683c\u4e2d\uff0c\u5bf9\u5176\u4e2d\u4e00\u5217\u505a\u4e3b\u7801\uff09<\/p>\n

3\u3001\u4e3b\u7801\u662f\u591a\u5c5e\u6027\u7684\u53ea\u80fd\u6709\u4e00\u79cd\u8bf4\u660e\u65b9\u6cd5<\/h4>\n

1\u3001\u5b9a\u4e49\u4e3a\u8868\u7ea7\u7ea6\u675f\u6761\u4ef6<\/p>\n

4\u3001\u4f8b\u5b50<\/h4>\n

1\u3001\u4f8b\u5b501
\n

\"image-20230906222853839\"<\/div><\/p>\n

5.1.2\u3001\u5b9e\u4f53\u5b8c\u6574\u6027\u68c0\u67e5\u548c\u8fdd\u7ea6\u5904\u7406<\/h3>\n

1\u3001\u5b8c\u6574\u6027\u5185\u5bb9\u68c0\u67e5<\/h4>\n

1\u3001\u6570\u636e\u5e93\u7cfb\u7edf\u6309\u7167\u89c4\u5219\uff0c\u5bf9\u6570\u636e\u8fdb\u884c\u81ea\u52a8\u68c0\u67e5<\/p>\n

1\u3001\u4e3b\u8981\u5305\u62ec\uff1a<\/h5>\n

1\u3001\u4e3b\u7801\u662f\u5426\u552f\u4e00\uff0c\u4e0d\u552f\u4e00\u5c31\u9519\u8bef\u6216\u62d2\u7edd<\/p>\n

2\u3001\u4e3b\u7801\u7684\u5c5e\u6027\u503c\uff0c\u662f\u5426\u4e3a\u7a7a\uff0c\u6709\u5c31\u76f4\u63a5\u62d2\u7edd\u6216\u4fee\u6539\u6389<\/p>\n

2\u3001\u68c0\u67e5\u4e3b\u7801\u503c\u65b9\u6cd5<\/h4>\n

1\u3001\u65b9\u6cd5<\/h5>\n

1\u3001\u662f\u8fdb\u884c\u5168\u8868\u626b\u63cf\uff08\u904d\u5386\uff09<\/p>\n

2\u3001\u56fe\u89e3<\/p>\n

\"image-20230906223509461\"<\/div><\/p>\n
2\u3001\u8bf4\u660e<\/h5>\n

1\u3001\u5168\u8868\u626b\u63cf\u5341\u5206\u6d6a\u8d39\u8d44\u6e90<\/p>\n

2\u3001RDBMS\u4f1a\u5728\u4e3b\u7801\u4e0a\u81ea\u52a8\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15<\/p>\n

5.2\u3001\u53c2\u7167\u5b8c\u6574\u6027<\/h2>\n

5.2.1\u3001\u53c2\u7167\u5b8c\u6574\u6027\u5b9a\u4e49<\/h3>\n

1\u3001\u5b9a\u4e49<\/h4>\n

1\u3001\u683c\u5f0f<\/p>\n

FOREIGN KEY \u5b9a\u4e49\n\u7528REFERENCES\u77ed\u8bed\u77e5\u540d\u8fd9\u4e9b\u5916\u7801\u662f\u53c2\u7167\u54ea\u4e9b\u8868\u7684\u4e3b\u7801<\/code><\/pre>\n
2\u3001\u4f8b\u5b50<\/h4>\n
\"image-20230906224427609\"<\/div><\/p>\n
5.2.2\u3001\u53c2\u7167\u5b8c\u6574\u6027\u68c0\u67e5\u548c\u8fdd\u7ea6\u5904\u7406<\/h3>\n
1\u3001\u5b9a\u4e49<\/h4>\n
1\u3001\u4e00\u4e2a\u53c2\u7167\u5b8c\u6574\u6027\u5c06\u4e24\u4e2a\u8868\u4e2d\u7684\u76f8\u5e94\u5143\u7ec4\u8054\u7cfb\u8d77\u6765\uff0c\u5bf9\u88ab\u53c2\u7167\u8868\u548c\u53c2\u7167\u8868\u8fdb\u884c\u64cd\u4f5c\uff08\u589e\u5220\u6539\u67e5\uff09\u65f6\u4f1a\u7834\u574f\u53c2\u7167\u5b8c\u6574\u6027\uff0c\u6240\u4ee5\u9700\u8981\u68c0\u67e5<\/p>\n
2\u3001\u4f8b\u5b50<\/h4>\n
\"image-20230906230427317\"<\/div><\/p>\n
3\u3001\u53c2\u7167\u5b8c\u6574\u6027\u8fdd\u7ea6\u5904\u7406\u89c4\u5219<\/h4>\n
1\u3001\u62d2\u7edd\uff08NO ACTION\uff09<\/h5>\n
1\u3001\u4e0d\u5141\u8bb8\u6267\u884c\u8be5\u64cd\u4f5c\uff0c\u4e00\u822c\u4e3a\u9ed8\u8ba4<\/p>\n
2\u3001\u7ea7\u8054\uff08CASCADE\uff09<\/h5>\n
1\u3001\u7cfb\u7edf\u4f1a\u628a\u4e0d\u4e00\u81f4\u7684\u6570\u636e\u5168\u90e8\u4fee\u6539\u4e3a\u4e00\u81f4\u7684\u64cd\u4f5c<\/p>\n
3\u3001\u7a7a\u503c\uff08SET-NULL\uff09<\/h5>\n
1\u3001\u5f53\u9020\u6210\u4e0d\u4e00\u81f4\u7684\u65f6\u5019\uff0c\u7cfb\u7edf\u4f1a\u628a\u4e0d\u4e00\u81f4\u7684\u503c\u8bbe\u7f6e\u4e3aNULL<\/p>\n
5\u3001\u4f8b\u5b50<\/h5>\n
\"image-20230906231133550\"<\/div><\/p>\n
5.3\u3001\u7528\u6237\u5b9a\u4e49\u7684\u5b8c\u6574\u6027<\/h2>\n
1\u3001\u9488\u5bf9\u67d0\u4e00\u5177\u4f53\u5e94\u7528\u6570\u636e\uff0c\u5fc5\u987b\u6ee1\u8db3\u8bed\u4e49\u8981\u6c42<\/p>\n
2\u3001\u7531\u6570\u636e\u5e93\u7cfb\u7edf\u63d0\u4f9b\u4e86\u5b9a\u4e49\u68c0\u9a8c\u7528\u6237\u5b9a\u4e49\u5b8c\u6574\u6027\u7684\u673a\u5236\uff0c\u4e0d\u662f\u7a0b\u5e8f\u627f\u62c5<\/p>\n
5.3.1\u3001\u5c5e\u6027\u5b9a\u4e49\u7684\u7ea6\u675f\u6761\u4ef6<\/h3>\n
1\u3001\u5b9a\u4e49<\/h4>\n
1\u3001\u5217\u503c\u975e\u7a7a\uff08NOT NULL)\u3001\u552f\u4e00\uff08UNIQUE\uff09\u3001\u662f\u5426\u6ee1\u8db3\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff08CHECK\uff09<\/strong><\/p>\n
1\u3001\u4f8b\u5b50<\/h5>\n
\"image-20230906232025422\"<\/div><\/p>\n
2\u3001\u5c5e\u6027\u4e0a\u7684\u7ea6\u675f\u6761\u4ef6\u68c0\u67e5\u548c\u8fdd\u7ea6\u5904\u7406<\/h4>\n
1\u3001\u6570\u636e\u5e93\u7cfb\u7edf\u8fdb\u884c\u68c0\u67e5\uff0c\u5982\u679c\u4e0d\u6ee1\u8db3\u5219\u64cd\u4f5c\u88ab\u62d2\u7edd\u6267\u884c<\/p>\n
5.3.2\u3001\u5143\u7ec4\u4e0a\u7684\u7ea6\u675f\u6761\u4ef6<\/h3>\n
1\u3001 \u5b9a\u4e49<\/h4>\n
1\u3001\u5728CREATE TABLE \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528CHECK\u77ed\u8bed\uff0c\u5b9a\u4e49\u5143\u7ec4\u4e0a\u7684\u7ea6\u675f\u6761\u4ef6<\/p>\n
2\u3001\u53ef\u4ee5\u8bbe\u7f6e\u5728\u4e0d\u540c\u5c5e\u6027\u4e4b\u95f4\u7684\u53d6\u503c\u76f8\u4e92\u7ea6\u675f\u6761\u4ef6<\/p>\n
3\u3001\u4f8b\u5b50<\/p>\n
\"image-20230906232448056\"<\/div><\/p>\n
2\u3001\u5143\u7ec4\u4e0a\u7ea6\u675f\u6761\u4ef6\u68c0\u67e5\u548c\u8fdd\u7ea6\u5904\u7406<\/h4>\n
1\u3001\u6570\u636e\u5e93\u7cfb\u7edf\u8fdb\u884c\u68c0\u67e5\uff0c\u5982\u679c\u4e0d\u6ee1\u8db3\u5219\u64cd\u4f5c\u88ab\u62d2\u7edd\u6267\u884c<\/p>\n
5.4\u3001\u5b8c\u6574\u6027\u7ea6\u675f\u547d\u540d\u5b50\u53e5<\/h2>\n
1\u3001\u5b8c\u6574\u6027\u7ea6\u675f\u547d\u540d\u5b50\u53e5<\/h3>\n
1\u3001\u683c\u5f0f<\/h4>\n
CONSTRAINT<\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6\u540d> <\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6><\/code><\/pre>\n
1\u3001\u5176\u4e2d\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6\u5305\u62ecNOT NULL\uff1bUNIQUE\uff1bPRIMARY KEY\uff1bFOREIGN KEY\uff1bCHECK<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230906232944411\"<\/div><\/p>\n
2\u3001\u4fee\u6539\u8868\u4e2d\u7684\u5b8c\u6574\u6027\u9650\u5236<\/h4>\n
1\u3001\u683c\u5f0f<\/p>\n
ALTER TABLE\u8fdb\u884c\u4fee\u6539<\/code><\/pre>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230906233350403\"<\/div><\/p>\n
5.5\u3001\u57df\u4e2d\u7684\u5b8c\u6574\u6027\u9650\u5236<\/h2>\n
5.5.1\u3001\u5185\u5bb9<\/h3>\n
1\u3001\u57df\uff1a\u4e00\u5217\u6570\u636e\u7684\u53d6\u503c\u8303\u56f4\uff0c\u76f8\u540c\u6570\u636e\u7c7b\u578b\u7684\u96c6\u5408<\/p>\n
5.5.2\u3001\u8bed\u6cd5<\/h3>\n
1\u3001\u8bed\u6cd5<\/h4>\n
CREATE DOMAIN\u8bed\u53e5<\/code><\/pre>\n
2\u3001\u4f8b\u5b50<\/h4>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230908095030044\"<\/div><\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230908095549282\"<\/div><\/p>\n
5.6\u3001\u65ad\u8a00<\/h2>\n
1\u3001\u521b\u5efa\u65ad\u8a00\u7684\u8bed\u53e5\u683c\u5f0f<\/h3>\n
1\u3001\u683c\u5f0f<\/p>\n
CREATE ASSERTION <\u65ad\u8a00\u540d><CHECK \u5b50\u53e5><\/code><\/pre>\n
2\u3001check\u4e2d\u7684\u7ea6\u675f\u6761\u4ef6\u4e0ewhere\u5b50\u53e5\u7684\u6761\u4ef6\u8868\u8fbe\u5f0f\u7c7b\u4f3c<\/p>\n
2\u3001\u4f8b\u5b50<\/h4>\n
1\u3001\u4f8b\u5b501<\/p>\n
\"image-20230908100426772\"<\/div><\/p>\n
2\u3001\u4f8b\u5b502<\/p>\n
\"image-20230908100430249\"<\/div><\/p>\n
3\u3001\u4f8b\u5b503<\/p>\n
\"image-20230908100433888\"<\/div><\/p>\n
4\u3001\u4f8b\u5b504<\/p>\n
\"image-20230908100437588\"<\/div><\/p>\n
2\u3001\u5220\u9664\u65ad\u8a00<\/h3>\n
1\u3001\u683c\u5f0f<\/h4>\n
DROP ASSERTION <\u65ad\u8a00\u540d>;<\/code><\/pre>\n
1\u3001\u5f00\u9500\u5360\u8d44\u6e90\u8f83\u9ad8\uff0c\u4e00\u822c\u4e0d\u5efa\u8bae\u7528<\/p>\n
5.7\u3001\u89e6\u53d1\u5668<\/h2>\n
1\u3001\u4ecb\u7ecd<\/h4>\n
1\u3001\u89e6\u53d1\u5668\u662f\u7528\u6237\u5b9a\u4e49\u5728\u5173\u7cfb\u8868\u4e0a\u7684\u4e00\u7c7b\u7531\u4e8b\u4ef6\u9a71\u52a8\u7684\u7279\u6b8a\u8fc7\u7a0b<\/p>\n
2\u3001\u8bf4\u660e<\/h4>\n
1\u3001\u89e6\u53d1\u5668\u4fdd\u5b58\u5728\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e2d<\/p>\n
2\u3001\u4efb\u4f55\u7528\u6237\u7684\u589e\u5220\u6539\u64cd\u4f5c\uff0c\u7531\u670d\u52a1\u5668\u81ea\u52a8\u6fc0\u6d3b\u89e6\u53d1\u5668<\/p>\n
3\u3001\u89e6\u53d1\u5668\u53ef\u4ee5\u5b9e\u65bd\u66f4\u4e3a\u590d\u6742\u7684\u68c0\u67e5\u548c\u64cd\u4f5c\uff0c\u5177\u6709\u66f4\u7cbe\u7ec6\u548c\u5f3a\u5927\u7684\u6570\u636e\u63a7\u5236\u80fd\u529b<\/p>\n
5.7.1\u3001\u5b9a\u4e49\u89e6\u53d1\u5668<\/h3>\n
1\u3001\u89e6\u53d1\u5668\u53c8\u53eb\u4e8b\u4ef6-\u6761\u4ef6-\u52a8\u4f5c<\/p>\n
1\u3001\u683c\u5f0f<\/h4>\n
CREATE TRIGGER <\u89e6\u53d1\u5668\u540d\u79f0>\n{BEFORE |AFTER} <\u89e6\u53d1\u4e8b\u4ef6> ON <\u8868\u540d>\nREFERENCING NEW | OLD ROW AS <\u53d8\u91cf>\nFROM EACH {ROW | STATEMENT}\n[WHEN <\u89e6\u53d1\u6761\u4ef6>] <\u89e6\u53d1\u52a8\u4f5c\u63d0><\/code><\/pre>\n
2\u3001\u5b9a\u4e49\u89e6\u53d1\u5668\u7684\u8bed\u6cd5\u8bf4\u660e<\/h4>\n
1\u3001\u5fc5\u987b\u662f\u8868\u7684\u62e5\u6709\u8005<\/h5>\n
2\u3001\u89e6\u53d1\u5668\u540d<\/h5>\n
1\u3001\u89e6\u53d1\u5668\u53ef\u4ee5\u5305\u542b\u6a21\u5f0f\u540d\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u5305\u542b<\/p>\n
2\u3001\u5728\u540c\u4e00\u6a21\u5f0f\u4e0b\u89e6\u53d1\u5668\u5fc5\u987b\u552f\u4e00<\/p>\n
3\u3001\u8868\u540d<\/h5>\n
1\u3001\u89e6\u53d1\u5668\u53ea\u80fd\u5b9a\u4e49\u5728\u57fa\u672c\u8868\u4e0a\uff0c\u4e0d\u80fd\u5b9a\u4e49\u5728\u89c6\u56fe<\/p>\n
2\u3001\u5982\u679c\u57fa\u672c\u8868\u53d1\u751f\u53d8\u5316\uff0c\u5219\u5bf9\u5e94\u7684\u89e6\u53d1\u5668\u4e5f\u4f1a\u88ab\u6fc0\u6d3b<\/p>\n
4\u3001\u4e8b\u4ef6\u89e6\u53d1<\/h5>\n
1\u3001insert\/delete\/update\u8fd9\u51e0\u4e2a\u4e8b\u4ef6\u7ec4\u5408<\/p>\n
2\u3001update of<\u89e6\u53d1\u5217\uff0c\u2026>\uff0c\u5373\u8fdb\u4e00\u6b65\u77e5\u660e\u4fee\u6539\u54ea\u4e9b\u5217\u65f6\u673a\u4f1a\u89e6\u53d1\u5668<\/p>\n
3\u3001AFTER\uff1a\u4e8b\u4ef6\u5b8c\u6210\u540e\u624d\u6fc0\u6d3b\u89e6\u53d1\u5668<\/p>\n
4\u3001BEFORE\uff1a\u65f6\u95f4\u89e6\u53d1\u524d\uff0c\u6fc0\u6d3b\u89e6\u53d1\u5668<\/p>\n
5\u3001\u89e6\u53d1\u5668\u7c7b\u578b<\/h5>\n
1\u3001\u884c\u7ea7\u89e6\u53d1\u5668\uff08FOR EACH ROW)<\/p>\n
2\u3001\u8bed\u53e5\u7ea7\u89e6\u53d1\u5668\uff08FOR EACH STATEMENT)<\/p>\n
3\u3001\u4f8b\u5b50<\/p>\n
\"image-20230908102712104\"<\/div><\/p>\n
6\u3001\u89e6\u53d1\u6761\u4ef6<\/h5>\n
1\u3001\u89e6\u53d1\u4f53\u52a8\u4f5c\u4e3a\u771f\u65f6\uff0c\u89e6\u53d1\u52a8\u4f5c\u4f53\u624d\u6267\u884c\uff0c\u5426\u5219\u89e6\u53d1\u52a8\u4f5c\u4f53\u4e0d\u6267\u884c<\/p>\n
2\u3001\u5982\u679c\u6ca1\u6709WHEN\u89e6\u53d1\u6761\u4ef6\uff0c\u5219\u89e6\u53d1\u4f53\u52a8\u4f5c\u5728\u89e6\u53d1\u5668\u6fc0\u6d3b\u540e\u7acb\u5373\u6267\u884c<\/p>\n
7\u3001\u89e6\u53d1\u52a8\u4f5c\u4f53<\/h5>\n
1\u3001\u53ef\u4ee5\u662f\u533f\u540dPL\/SQL\u8fc7\u7a0b\u5757\uff0c\u4e5f\u53ef\u4ee5\u662f\u5bf9\u81ea\u5df1\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b\u7684\u8c03\u6574<\/p>\n
2\u3001\u5982\u679c\u662f\u884c\u7ea7\u89e6\u53d1\u5668\uff0c\u7528\u6237\u90fd\u53ef\u4ee5\u5728\u8fc7\u7a0b\u4f53\u4e2d\u4f7f\u7528new \u548cold\u5f15\u7528\u4e8b\u4ef6\u4e4b\u540e\u7684\u65b0\u503c\u548c\u4e8b\u4ef6\u4e4b\u524d\u7684\u65e7\u503c<\/p>\n
3\u3001\u5982\u679c\u8bed\u53e5\u89e6\u53d1\u5668\uff0c\u5219\u4e0d\u80fd\u5728\u89e6\u53d1\u52a8\u4f5c\u63d0\u5316\u603b\u4f7f\u7528new\u548cold<\/p>\n
4\u3001\u5982\u679c\u89e6\u53d1\u5668\u52a8\u4f5c\u4f53\u6267\u884c\u5931\u8d25\uff0c\u6fc0\u6d3b\u89e6\u53d1\u5668\u7684\u4e8b\u4ef6\u5c31\u4f1a\u7ec8\u6b62\u6267\u884c\uff0c\u89e6\u53d1\u5668\u7684\u76ee\u6807\u8868\u6216\u89e6\u53d1\u5668\u53ef\u80fd\u5f71\u54cd\u5176\u4ed6\u5bf9\u8c61\u4e0d\u53d1\u751f\u4efb\u4f55\u53d8\u5316<\/p>\n
5\u3001\u6ce8\u610f\uff1a\u4e0d\u540c\u7684RDBMS\u4ea7\u54c1\u89e6\u53d1\u5668\u8bed\u6cd5\u5404\u90e8\u76f8\u540c<\/strong><\/p>\n
6\u3001\u4f8b\u5b501<\/p>\n
7\u3001\u4f8b\u5b502<\/p>\n
5.7.2\u3001\u6fc0\u6d3b\u89e6\u53d1\u5668<\/h3>\n
1\u3001\u4e00\u4e2a\u6570\u636e\u53ef\u80fd\u6709\u591a\u4e2a\u89e6\u53d1\u5668\uff0c\u89e6\u53d1\u9075\u5faa\u4ee5\u4e0b\u987a\u5e8f<\/h4>\n
1\u3001\u6267\u884c\u8be5\u8868\u4e0a\u7684BEFORE\u89e6\u53d1\u5668<\/p>\n
2\u3001\u6fc0\u6d3b\u89e6\u53d1\u5668\u7684SQL\u96e8\u5177<\/p>\n
3\u3001\u6267\u884c\u8be5\u8868\u4e0a\u7684AFTER\u89e6\u53d1\u5668<\/p>\n
5.7.3\u3001\u5220\u9664\u89e6\u53d1\u5668<\/h3>\n
1\u3001\u8bed\u6cd5\u683c\u5f0f<\/h4>\n
1\u3001\u683c\u5f0f<\/p>\n
DROP TRIGGER <\u89e6\u53d1\u5668\u540d> ON <\u8868\u540d><\/code><\/pre>\n
2\u3001\u5fc5\u987b\u6709\uff0c\u624d\u80fd\u5220\u9664<\/p>\n
5.8\u3001\u5c0f\u7ed3<\/h2>\n
1\u3001\u5b8c\u6574\u6027\u662f\u6211\u4e86\u4fdd\u8bc1\u6570\u636e\u5e93\u5b58\u50a8\u7684\u6570\u636e\u662f\u6b63\u786e\u7684\uff1b\u6700\u91cd\u8981\u7684\u662f\u5b9e\u4f53\u5b8c\u6574\u6027\u548c\u53c2\u7167\u5b8c\u6574\u6027<\/p>\n
2\u3001\u5b8c\u6574\u6027\u5b9a\u4e49\u4e00\u822c\u6709SQL\u7684\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\u5b8c\u6210\uff0c\u73b0\u5728\u63d0\u4f9b\u4e86\u5b8c\u6574\u6027\u7684\u5b9a\u4e49\u548c\u68c0\u67e5<\/p>\n
3\u3001\u8fdd\u80cc\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6\u65f6RDBMS\u91c7\u53d6\u9ed8\u8ba4\u52a8\u4f5c<\/p>\n
4\u3001\u89e6\u53d1\u5668\u662f\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\u7684\u91cd\u8981\u65b9\u6cd5\uff0c\u4e00\u822c\u4e0d\u4f7f\u7528\uff0c\u5927\u591a\u6570\u4f7f\u7528\u5728\u5927\u578b\u7684\u6570\u636e\u5e93\u9879\u76ee\u4e2d<\/p>\n
\u7b2c\u516d\u7ae0\u3001\u5173\u7cfb\u6570\u636e\u7406\u8bba<\/h1>\n","protected":false},"excerpt":{"rendered":"
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