{"id":3572,"date":"2023-07-27T14:52:53","date_gmt":"2023-07-27T06:52:53","guid":{"rendered":"https:\/\/h5app.yimenapp.cn\/h5app\/?p=3572"},"modified":"2023-07-27T14:52:53","modified_gmt":"2023-07-27T06:52:53","slug":"app%e5%bc%80%e5%8f%91sql%e9%9c%80%e8%a6%81%e6%b3%a8%e6%84%8f%e5%93%aa%e4%ba%9b%e7%bb%86%e8%8a%82%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/h5app.yimenapp.cn\/h5app\/2023\/appkfa\/3572\/","title":{"rendered":"app\u5f00\u53d1sql\u9700\u8981\u6ce8\u610f\u54ea\u4e9b\u7ec6\u8282\uff1f"},"content":{"rendered":"

\u5728\u73b0\u4ee3\u7684\u79fb\u52a8\u5e94\u7528\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u5e38\u5e38\u9700\u8981\u4e0e\u8fdc\u7a0b\u7684\u670d\u52a1\u5668\u8fdb\u884c\u6570\u636e\u4ea4\u4e92\uff0c\u800cSQL\uff08Structured Query Language\uff0c\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff09\u5219\u662f\u6211\u4eec\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u5fc5\u4e0d\u53ef\u5c11\u7684\u4e00\u4e2a\u91cd\u8981\u5de5\u5177\u3002\u672c\u6587\u5c06\u7b80\u8981\u6982\u62ecSQL\u7684\u4e3b\u8981\u6982\u5ff5\uff0c\u5e76\u4e3aAPP<\/a>\u521d\u5b66\u8005\u63d0\u4f9b\u5165\u95e8\u7ea7\u7684\u6559\u7a0b\u3002<\/p>\n

SQL\u7b80\u4ecb<\/p>\n

SQL\u662f\u4e00\u79cd\u7528\u4e8e\u7ba1\u7406\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff08\u5982\uff1aMySQL, Oracle, Microsoft SQL Server\u7b49\uff09\u7684\u7f16\u7a0b\u8bed\u8a00\u3002\u5b83\u53ef\u4ee5\u8ba9\u6211\u4eec\u521b\u5efa\u3001\u67e5\u8be2\u3001\u4fee\u6539\u548c\u5220\u9664\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u4ee5\u53ca\u7ba1\u7406\u6570\u636e\u5e93\u7ed3\u6784\u7b49\u3002SQL\u6709\u591a\u79cd\u65b9\u8a00\uff0c\u4f46\u8fd9\u91cc\u6211\u4eec\u4e3b\u8981\u8ba8\u8bba\u5176\u901a\u7528\u7684\u7279\u6027\u3002<\/p>\n

\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08RDBMS\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u3001\u7ba1\u7406\u548c\u63d0\u4f9b\u6570\u636e\u7684\u8f6f\u4ef6\u3002\u5b83\u901a\u5e38\u5305\u62ec\u591a\u4e2a\u6570\u636e\u8868\uff0c\u6bcf\u4e2a\u8868\u6709\u4e00\u5b9a\u6570APP\u5f00\u53d1<\/a>\u91cf\u7684\u5b57\u6bb5\uff08columns\uff09\uff0c\u7528\u4e8e\u63cf\u8ff0\u6570\u636e\u7684\u4e0d\u540c\u7279\u5f81\u3002\u800c\u8868\u4e2d\u7684\u4e00\u884c\uff08row\uff09\u5219\u4ee3\u8868\u4e00\u4e2a\u6570\u636e\u9879\u3002<\/p>\n

SQL\u7684\u4e3b\u8981\u64cd\u4f5c<\/p>\n

1. \u6570\u636e\u67e5\u8be2\uff08SELECT\uff09<\/p>\n

SELECT\u8bed\u53e5\u662fSQL\u7684\u57fa\u77f3\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u6570\u636e\u3002\u6211\u4eec\u53ef\u4ee5\u57fa\u4e8e\u4e0d\u540c\u7684\u6761\u4ef6\u3001\u6392\u5e8f\u89c4\u5219\u548c\u9650\u5236\u6570\u91cf\u7b49\u8fdb\u884c\u67e5\u627e\u3002<\/p>\n

\u793a\u4f8b\uff1a<\/p>\n

“`<\/p>\n

SELECT first_name, last_name, age FROM users WHERE age > 18 ORDER BY last_name LIMIT 10;<\/p>\n

“`<\/p>\n

2. \u6570\u636e\u63d2\u5165\uff08INSERT\uff09<\/p>\n

INSERT\u8bed\u53e5\u7528\u4e8e\u5411\u6570\u636e\u5e93\u4e2d\u63d2\u5165\u65b0\u6570\u636e\uff0c\u53ef\u4ee5\u63d2\u5165\u5355\u4e2a\u8bb0\u5f55\u6216\u6279\u91cf\u63d2\u5165\u591a\u4e2a\u8bb0\u5f55\u3002<\/p>\n

\u793a\u4f8b\uff1a<\/p>\n

“`<\/p>\n

INSERT INTO users (first_name, last_name, age) VALUES (‘John’, ‘Doe’, 25);<\/p>\n

“`<\/p>\n

3. \u6570\u636e\u66f4\u65b0\uff08UPDATE\uff09<\/p>\n

UPDATE\u8bed\u53e5\u7528\u4e8e\u4fee\u6539\u6570\u636e\u5e93\u4e2d\u73b0\u6709\u6570\u636e\u7684\u503c\u3002\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u6765\u66f4\u65b0\u4e00\u4e2a\u6216\u591a\u4e2a\u5b57\u6bb5\u3002<\/p>\n

\u793a\u4f8b\uff1a<\/p>\n

“`<\/p>\n

UPDATE users SET age = 26 WHERE first_name = ‘John’ AND last_name = ‘Doe’;<\/p>\n

“`<\/p>\n

4. \u6570\u636e\u5220\u9664\uff08DELETE\uff09<\/p>\n

DELETE\u8bed\u53e5\u7528\u4e8e\u4ece\u6570\u636e\u5e93\u4e2d\u5220\u9664\u6570\u636e\u3002\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u6765\u5220\u9664\u4e00\u884c\u6216\u591a\u884c\u6570\u636e\u3002<\/p>\n

\u793a\u4f8b\uff1a<\/p>\n

“`<\/p>\n

DELETE FROM users WHERE id = 1;<\/p>\n

“`<\/p>\n

5. \u8868\u7ed3\u6784\u7ba1\u7406<\/p>\n

\u9664\u4e86\u6570\u636e\u64cd\u4f5c\u5916\uff0cSQL\u8fd8\u53ef\u4ee5\u8ba9\u6211\u4eec\u7ba1\u7406\u6570\u636e\u5e93\u8868\u7ed3\u6784\uff0c\u5305\u62ec\u521b\u5efa\u3001\u4fee\u6539\u548c\u5220\u9664\u8868\u3002<\/p>\n

\u793a\u4f8b\uff1a<\/p>\n

“`<\/p>\n

CREATE TABLE users (id INT PRIMARY KEY, first_name VARCHAR(50), last_name VARCHAR(50), age INT);<\/p>\n

ALTER TABLE users ADD email VARCHAR(100);<\/p>\n

DROP TABLE users;<\/p>\n

“`<\/p>\n

\u6570\u636e\u5e93\u8fde\u63a5\u4e0e\u67e5\u8be2<\/p>\n

\u5728\u79fb\u52a8\u5e94\u7528\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u5728\u5ba2\u6237\u7aef\uff08\u5982\uff1aiOS\/Android\u5e94\u7528\uff09\u4e0e\u670d\u52a1\u5668\u7aef\uff08\u5982\uff1aNode.js\/Python\u7b49\u670d\u52a1\u5668\u7a0b\u5e8f\uff09\u4e4b\u95f4\u5efa\u7acb\u8fde\u63a5\uff0c\u4ee5\u4fbf\u5728\u8fdc\u7a0b\u6570\u636e\u5e93\u4e2d\u6267\u884cSQL\u67e5\u8be2\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7API\uff08\u5e94\u7528\u7a0b\u5e8f\u63a5\u53e3\uff09\u6216\u8005SDK\uff08\u8f6f\u4ef6\u5f00\u53d1\u5de5\u5177\u5305\uff09\u7b49\u6765\u5b9e\u73b0\u3002\u8fd9\u91cc\u4ee5Python\u4e3a\u4f8b\u7b80\u8981\u8bf4\u660e\uff1a<\/p>\n

1. \u5b89\u88c5MySQL Connector<\/p>\n

“`<\/p>\n

pip install mysql-connector-python<\/p>\n

“`<\/p>\n

2. \u8fde\u63a5\u6570\u636e\u5e93<\/p>\n

“`python<\/p>\n

import mysql.connector<\/p>\n

cnx = mysql.connector.connect(user=’username’, password=’password’,<\/p>\n

host=’hostname’, database=’database_name’)<\/p>\n

“`<\/p>\n

3. \u67e5\u8be2\u6570\u636e<\/p>\n

“`python<\/p>\n

cursor = cnx.cursor()<\/p>\n

q<\/p>\n

<\/figure>\n<\/p>\n

uery = “SELECT first_name, last_name, age FROM users WHERE age > 18”<\/p>\n

cursor.execute(query)<\/p>\n

for row in cursor:<\/p>\n

print(row)<\/p>\n

cursor.close()<\/p>\n

cnx.close()<\/p>\n

“`<\/p>\n

\u603b\u7ed3<\/p>\n

\u4ee5\u4e0a\u4fbf\u662f\u5173\u4e8eAPP\u5f00\u53d1\u4e2d\u5982\u4f55\u4f7f\u7528SQL\u7684\u7b80\u5355\u6559\u7a0b\u3002\u5e0c\u671b\u5bf9\u521d\u5b66\u8005\u6709\u6240\u5e2e\u52a9\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u6839\u636e\u81ea\u8eab\u9700\u6c42\u6765\u8c03\u6574\u67e5\u8be2\u8bed\u53e5\uff0c\u5e76\u5c06\u6570\u636e\u5e93\u64cd\u4f5c\u4e0e\u7a0b\u5e8f\u4ee3\u7801\u76f8\u7ed3\u5408\uff0c\u4ee5\u4fbf\u66f4\u597d\u5730\u4e3a\u7528\u6237\u63d0\u4f9b\u6570\u636e\u670d\u52a1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728\u73b0\u4ee3\u7684\u79fb\u52a8\u5e94\u7528\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u5e38\u5e38\u9700\u8981\u4e0e\u8fdc\u7a0b\u7684\u670d\u52a1\u5668\u8fdb\u884c\u6570\u636e\u4ea4\u4e92\uff0c\u800cSQL\uff08Structured Query Language\uff0c\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff09\u5219\u662f\u6211\u4eec\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u5fc5\u4e0d\u53ef\u5c11\u7684\u4e00\u4e2a\u91cd\u8981\u5de5\u5177\u3002\u672c\u6587\u5c06\u7b80\u8981\u6982<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3680,759,7056,7055,4117],"topic":[],"class_list":{"0":"post-3572","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-appkfa","7":"tag-app","8":"tag-759","9":"tag-7056","11":"tag-4117"},"_links":{"self":[{"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/posts\/3572","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/comments?post=3572"}],"version-history":[{"count":0,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/posts\/3572\/revisions"}],"wp:attachment":[{"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/media?parent=3572"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/categories?post=3572"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/tags?post=3572"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/topic?post=3572"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}