{"id":187922,"date":"2024-11-11T18:18:22","date_gmt":"2024-11-11T10:18:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187922\/"},"modified":"2024-11-11T18:18:23","modified_gmt":"2024-11-11T10:18:23","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9c%80%e5%b8%b8%e7%94%a8%e7%9a%84%e5%85%ab%e7%a8%ae%e5%9f%ba%e7%a4%8e%e8%aa%9e%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187922\/","title":{"rendered":"\u6578\u64da\u5eab\u6700\u5e38\u7528\u7684\u516b\u7a2e\u57fa\u790e\u8a9e\u6cd5"},"content":{"rendered":"

\u6578\u64da\u5eab\u6700\u5e38\u7528\u7684\u516b\u7a2e\u57fa\u790e\u8a9e\u6cd5<\/h1>\n

\u5728\u73fe\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u666e\u904d\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9084\u662f\u500b\u4eba\u958b\u767c\u8005\uff0c\u638c\u63e1\u6578\u64da\u5eab\u7684\u57fa\u672c\u8a9e\u6cd5\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u6578\u64da\u5eab\u4e2d\u6700\u5e38\u7528\u7684\u516b\u7a2e\u57fa\u790e\u8a9e\u6cd5\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u6578\u64da\u5eab\u3002<\/p>\n

1. SELECT \u8a9e\u6cd5<\/h2>\n

SELECT \u8a9e\u6cd5\u662f\u7528\u4f86\u67e5\u8a62\u6578\u64da\u5eab\u4e2d\u6578\u64da\u7684\u57fa\u672c\u8a9e\u6cd5\u3002\u5b83\u53ef\u4ee5\u9078\u64c7\u7279\u5b9a\u7684\u5217\u6216\u6574\u500b\u8868\u683c\u7684\u6578\u64da\u3002<\/p>\n

SELECT column1, column2 FROM table_name;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u540d\u70ba “users” \u7684\u8868\u4e2d\u9078\u64c7 “name” \u548c “email” \u5169\u500b\u6b04\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n
SELECT name, email FROM users;<\/code><\/pre>\n
2. INSERT \u8a9e\u6cd5<\/h2>\n
INSERT \u8a9e\u6cd5\u7528\u65bc\u5411\u6578\u64da\u5eab\u4e2d\u63d2\u5165\u65b0\u6578\u64da\u3002\u9019\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u975e\u5e38\u5e38\u898b\u7684\u4e00\u500b\u6b65\u9a5f\u3002<\/p>\n
INSERT INTO table_name (column1, column2) VALUES (value1, value2);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5411 “users” \u8868\u4e2d\u63d2\u5165\u4e00\u500b\u65b0\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
INSERT INTO users (name, email) VALUES ('John Doe', 'john@example.com');<\/code><\/pre>\n
3. UPDATE \u8a9e\u6cd5<\/h2>\n
UPDATE \u8a9e\u6cd5\u7528\u65bc\u66f4\u65b0\u6578\u64da\u5eab\u4e2d\u5df2\u5b58\u5728\u7684\u6578\u64da\u3002\u9019\u5c0d\u65bc\u7dad\u8b77\u6578\u64da\u7684\u6e96\u78ba\u6027\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n
UPDATE table_name SET column1 = value1 WHERE condition;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u66f4\u65b0 “users” \u8868\u4e2d\u67d0\u500b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
UPDATE users SET email = 'john.doe@example.com' WHERE name = 'John Doe';<\/code><\/pre>\n
4. DELETE \u8a9e\u6cd5<\/h2>\n
DELETE \u8a9e\u6cd5\u7528\u65bc\u522a\u9664\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u3002\u4f7f\u7528\u6642\u9700\u8b39\u614e\uff0c\u4ee5\u514d\u8aa4\u522a\u91cd\u8981\u6578\u64da\u3002<\/p>\n
DELETE FROM table_name WHERE condition;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664 “users” \u8868\u4e2d\u540d\u70ba “John Doe” \u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
DELETE FROM users WHERE name = 'John Doe';<\/code><\/pre>\n
5. CREATE TABLE \u8a9e\u6cd5<\/h2>\n
CREATE TABLE \u8a9e\u6cd5\u7528\u65bc\u5275\u5efa\u65b0\u7684\u6578\u64da\u8868\u3002\u9019\u662f\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\u7684\u7b2c\u4e00\u6b65\u3002<\/p>\n
CREATE TABLE table_name (column1 datatype, column2 datatype);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5275\u5efa\u4e00\u500b\u540d\u70ba “users” \u7684\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
CREATE TABLE users (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(100), email VARCHAR(100));<\/code><\/pre>\n
6. ALTER TABLE \u8a9e\u6cd5<\/h2>\n
ALTER TABLE \u8a9e\u6cd5\u7528\u65bc\u4fee\u6539\u5df2\u5b58\u5728\u7684\u6578\u64da\u8868\u7d50\u69cb\uff0c\u4f8b\u5982\u6dfb\u52a0\u6216\u522a\u9664\u6b04\u4f4d\u3002<\/p>\n
ALTER TABLE table_name ADD column_name datatype;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5411 “users” \u8868\u4e2d\u6dfb\u52a0\u4e00\u500b “age” \u6b04\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
ALTER TABLE users ADD age INT;<\/code><\/pre>\n
7. DROP TABLE \u8a9e\u6cd5<\/h2>\n
DROP TABLE \u8a9e\u6cd5\u7528\u65bc\u522a\u9664\u6574\u500b\u6578\u64da\u8868\u53ca\u5176\u6240\u6709\u6578\u64da\u3002\u9019\u662f\u4e00\u500b\u4e0d\u53ef\u9006\u7684\u64cd\u4f5c\u3002<\/p>\n
DROP TABLE table_name;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664 “users” \u8868\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
DROP TABLE users;<\/code><\/pre>\n
8. JOIN \u8a9e\u6cd5<\/h2>\n
JOIN \u8a9e\u6cd5\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u67e5\u8a62\u6578\u64da\uff0c\u6839\u64da\u76f8\u95dc\u6b04\u4f4d\u9032\u884c\u9023\u63a5\u3002\u9019\u5c0d\u65bc\u8907\u96dc\u67e5\u8a62\u975e\u5e38\u6709\u7528\u3002<\/p>\n
SELECT columns FROM table1 JOIN table2 ON table1.column = table2.column;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e “users” \u8868\u548c “orders” \u8868\u4e2d\u67e5\u8a62\u7528\u6236\u53ca\u5176\u8a02\u55ae\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
SELECT users.name, orders.order_id FROM users JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u638c\u63e1\u9019\u516b\u7a2e\u57fa\u790e\u8a9e\u6cd5\u662f\u5b78\u7fd2\u548c\u4f7f\u7528\u6578\u64da\u5eab\u7684\u57fa\u790e\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u67e5\u8a62\u3001\u63d2\u5165\u3001\u66f4\u65b0\u9084\u662f\u522a\u9664\uff0c\u9019\u4e9b\u8a9e\u6cd5\u90fd\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u4e86\u89e3\u6578\u64da\u5eab\u7684\u57fa\u672c\u64cd\u4f5c\u5f8c\uff0c\u60a8\u53ef\u4ee5\u66f4\u597d\u5730\u5229\u7528 \u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u63d0\u4f9b\u7684\u8cc7\u6e90\uff0c\u63d0\u5347\u696d\u52d9\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u6578\u64da\u5eab\u6700\u5e38\u7528\u7684\u516b\u7a2e\u57fa\u790e\u8a9e\u6cd5\uff0c\u63d0\u5347\u60a8\u7684\u6578\u64da\u7ba1\u7406\u6280\u80fd\uff0c\u8f15\u9b06\u638c\u63e1\u67e5\u8a62\u3001\u66f4\u65b0\u548c\u6578\u64da\u64cd\u4f5c\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-187922","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187922","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=187922"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187922\/revisions"}],"predecessor-version":[{"id":187923,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/187922\/revisions\/187923"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=187922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=187922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=187922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}