{"id":77218,"date":"2024-10-16T10:34:17","date_gmt":"2024-10-16T02:34:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/77218\/"},"modified":"2024-10-16T10:34:17","modified_gmt":"2024-10-16T02:34:17","slug":"mysql%e4%bf%ae%e6%94%b9%e8%a1%a8%e5%ad%97%e6%ae%b5%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c%e6%b5%81%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/77218\/","title":{"rendered":"MySQL\u4fee\u6539\u8868\u5b57\u6bb5\u7684\u5be6\u969b\u64cd\u4f5c\u6d41\u7a0b"},"content":{"rendered":"

MySQL\u4fee\u6539\u8868\u5b57\u6bb5\u7684\u5be6\u969b\u64cd\u4f5c\u6d41\u7a0b<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u96a8\u8457\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\uff0c\u6578\u64da\u5eab\u7684\u7d50\u69cb\u4e5f\u9700\u8981\u9032\u884c\u8abf\u6574\u3002\u4fee\u6539\u8868\u5b57\u6bb5\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u5e38\u898b\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5728MySQL\u4e2d\u4fee\u6539\u8868\u5b57\u6bb5\u7684\u5be6\u969b\u64cd\u4f5c\u6d41\u7a0b\u3002<\/p>\n

1. \u78ba\u8a8d\u9700\u6c42<\/h2>\n

\u5728\u9032\u884c\u4efb\u4f55\u4fee\u6539\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u78ba\u8a8d\u4fee\u6539\u7684\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u66f4\u6539\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\u3001\u540d\u7a31\u6216\u7d04\u675f\u689d\u4ef6\u3002\u9019\u4e9b\u9700\u6c42\u7684\u78ba\u8a8d\u5c07\u5e6b\u52a9\u60a8\u5236\u5b9a\u51fa\u5408\u9069\u7684\u4fee\u6539\u8a08\u5283\u3002<\/p>\n

2. \u5099\u4efd\u6578\u64da<\/h2>\n

\u5728\u9032\u884c\u4efb\u4f55\u7d50\u69cb\u6027\u4fee\u6539\u4e4b\u524d\uff0c\u5efa\u8b70\u5c0d\u6578\u64da\u5eab\u9032\u884c\u5099\u4efd\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u51fa\u73fe\u554f\u984c\u6642\u6062\u5fa9\u6578\u64da\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u5099\u4efd\u6578\u64da\u5eab\uff1a<\/p>\n

mysqldump -u username -p database_name > backup_file.sql<\/code><\/pre>\n
3. \u4f7f\u7528ALTER TABLE\u547d\u4ee4<\/h2>\n
\u5728MySQL\u4e2d\uff0c\u4fee\u6539\u8868\u5b57\u6bb5\u4e3b\u8981\u4f7f\u7528ALTER TABLE\u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u6dfb\u52a0\u3001\u522a\u9664\u6216\u4fee\u6539\u8868\u4e2d\u7684\u5b57\u6bb5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u64cd\u4f5c\u793a\u4f8b\uff1a<\/p>\n
3.1 \u4fee\u6539\u5b57\u6bb5\u540d\u7a31<\/h3>\n
\u5982\u679c\u9700\u8981\u4fee\u6539\u5b57\u6bb5\u7684\u540d\u7a31\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n
ALTER TABLE table_name CHANGE old_column_name new_column_name column_type;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5c07\u540d\u70ba\u201cage\u201d\u7684\u5b57\u6bb5\u6539\u70ba\u201cuser_age\u201d\uff0c\u4e26\u5c07\u5176\u985e\u578b\u8a2d\u7f6e\u70baINT\uff1a<\/p>\n
ALTER TABLE users CHANGE age user_age INT;<\/code><\/pre>\n
3.2 \u4fee\u6539\u5b57\u6bb5\u985e\u578b<\/h3>\n
\u5982\u679c\u9700\u8981\u66f4\u6539\u5b57\u6bb5\u7684\u6578\u64da\u985e\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n
ALTER TABLE table_name MODIFY column_name new_column_type;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5c07\u201cuser_age\u201d\u5b57\u6bb5\u7684\u985e\u578b\u5f9eINT\u6539\u70baVARCHAR(3)\uff1a<\/p>\n
ALTER TABLE users MODIFY user_age VARCHAR(3);<\/code><\/pre>\n
3.3 \u6dfb\u52a0\u65b0\u5b57\u6bb5<\/h3>\n
\u5982\u679c\u9700\u8981\u5728\u8868\u4e2d\u6dfb\u52a0\u65b0\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n
ALTER TABLE table_name ADD new_column_name column_type;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5411\u201cusers\u201d\u8868\u4e2d\u6dfb\u52a0\u4e00\u500b\u540d\u70ba\u201cemail\u201d\u7684VARCHAR\u5b57\u6bb5\uff1a<\/p>\n
ALTER TABLE users ADD email VARCHAR(255);<\/code><\/pre>\n
3.4 \u522a\u9664\u5b57\u6bb5<\/h3>\n
\u5982\u679c\u9700\u8981\u522a\u9664\u67d0\u500b\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n
ALTER TABLE table_name DROP COLUMN column_name;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u522a\u9664\u201cemail\u201d\u5b57\u6bb5\uff1a<\/p>\n
ALTER TABLE users DROP COLUMN email;<\/code><\/pre>\n
4. \u9a57\u8b49\u4fee\u6539<\/h2>\n
\u5b8c\u6210\u4fee\u6539\u5f8c\uff0c\u61c9\u8a72\u6aa2\u67e5\u8868\u7d50\u69cb\u4ee5\u78ba\u4fdd\u4fee\u6539\u5df2\u6210\u529f\u61c9\u7528\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u67e5\u770b\u8868\u7684\u7d50\u69cb\uff1a<\/p>\n
DESCRIBE table_name;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u67e5\u770b\u201cusers\u201d\u8868\u7684\u7d50\u69cb\uff1a<\/p>\n
DESCRIBE users;<\/code><\/pre>\n
5. \u6e2c\u8a66\u6578\u64da\u5b8c\u6574\u6027<\/h2>\n
\u5728\u4fee\u6539\u5b57\u6bb5\u5f8c\uff0c\u61c9\u8a72\u9032\u884c\u6e2c\u8a66\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6b63\u78ba\u6027\u3002\u9019\u5305\u62ec\u6aa2\u67e5\u6578\u64da\u662f\u5426\u80fd\u5920\u6b63\u78ba\u63d2\u5165\u3001\u66f4\u65b0\u548c\u67e5\u8a62\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728MySQL\u4e2d\u4fee\u6539\u8868\u5b57\u6bb5\u662f\u4e00\u500b\u76f8\u5c0d\u7c21\u55ae\u7684\u904e\u7a0b\uff0c\u4f46\u9700\u8981\u8b39\u614e\u64cd\u4f5c\u4ee5\u907f\u514d\u6578\u64da\u4e1f\u5931\u6216\u932f\u8aa4\u3002\u901a\u904e\u4e0a\u8ff0\u6b65\u9a5f\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u9032\u884c\u5b57\u6bb5\u7684\u4fee\u6539\u3002\u82e5\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u6216\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3MySQL\u4fee\u6539\u8868\u5b57\u6bb5\u7684\u5be6\u969b\u64cd\u4f5c\u6d41\u7a0b\uff0c\u5305\u62ec\u8a9e\u6cd5\u3001\u6b65\u9a5f\u53ca\u6ce8\u610f\u4e8b\u9805\uff0c\u8f15\u9b06\u638c\u63e1\u6578\u64da\u5eab\u7ba1\u7406\u6280\u5de7\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-77218","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77218","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=77218"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77218\/revisions"}],"predecessor-version":[{"id":77219,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77218\/revisions\/77219"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=77218"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=77218"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=77218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}