Python mysql-connector<\/h1>\n
\u641e\u61c2Python mysql-connector\u7684\u57fa\u672c\u64cd\u4f5c<\/span>\n <\/div>\n
\n MySQL \u662f\u6700\u6d41\u884c\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u672c\u7ae0\u8282\u6211\u4eec\u4e3a\u5927\u5bb6\u4ecb\u7ecd\u4f7f\u7528 mysql-connector \u6765\u8fde\u63a5\u4f7f\u7528 MySQL\uff0c mysql-connector \u662f MySQL \u5b98\u65b9\u63d0\u4f9b\u7684\u9a71\u52a8\u5668\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 pip \u547d\u4ee4\u6765\u5b89\u88c5 mysql-connector\uff1a\n <\/div>\n
 python -m pip install mysql-connector
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u6d4b\u8bd5 mysql-connector \u662f\u5426\u5b89\u88c5\u6210\u529f\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u4ee5\u4e0a\u4ee3\u7801\uff0c\u5982\u679c\u6ca1\u6709\u4ea7\u751f\u9519\u8bef\uff0c\u8868\u660e\u5b89\u88c5\u6210\u529f\u3002\n  <\/div>\n\n   \u6ce8\u610f\uff1a<\/span>\u5982\u679c\u4f60\u7684 MySQL \u662f 8.0 \u7248\u672c\uff0c\u5bc6\u7801\u63d2\u4ef6\u9a8c\u8bc1\u65b9\u5f0f\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u9700\u8981\u5148\u4fee\u6539 my.ini \u914d\u7f6e\uff1a\n  <\/div>\n\n [mysqld]
 default_authentication_plugin=mysql_native_password
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u7136\u540e\u5728 mysql \u4e0b\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u6765\u4fee\u6539\u5bc6\u7801\uff1a\n  <\/div>\n\n ALTER USER 'root'<\/span>@'localhost'<\/span> IDENTIFIED with <\/span>mysql_native_password BY '\u65b0\u5bc6\u7801'<\/span>;
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u521b\u5efa\u6570\u636e\u5e93\u8fde\u63a5<\/h2>\n\n    \u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u6765\u8fde\u63a5\u6570\u636e\u5e93\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>, # \u6570\u636e\u5e93\u4e3b\u673a\u5730\u5740
<\/span>   user=\"yourusername\"<\/span>, # \u6570\u636e\u5e93\u7528\u6237\u540d
<\/span>   passwd=\"yourpassword\"<\/span> # \u6570\u636e\u5e93\u5bc6\u7801
<\/span> )
  
 print(mydb)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u521b\u5efa\u6570\u636e\u5e93<\/h2>\n\n    \u521b\u5efa\u6570\u636e\u5e93\u4f7f\u7528 \"CREATE DATABASE\" \u8bed\u53e5\uff0c\u4ee5\u4e0b\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a test_db \u7684\u6570\u636e\u5e93\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>
 )
  
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"CREATE DATABASE test_db\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u521b\u5efa\u6570\u636e\u5e93\u524d\u6211\u4eec\u4e5f\u53ef\u4ee5\u4f7f\u7528 \"SHOW DATABASES\" \u8bed\u53e5\u6765\u67e5\u770b\u6570\u636e\u5e93\u662f\u5426\u5b58\u5728\uff1a\n  <\/div>\n\n \n      \n        # \u8f93\u51fa\u6240\u6709\u6570\u636e\u5e93\u5217\u8868\uff1a \n      <\/div> import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>
 )
  
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"SHOW DATABASES\"<\/span>)
  
 for <\/span><\/span>x in <\/span>mycursor:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6216\u8005\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u8fde\u63a5\u6570\u636e\u5e93\uff0c\u5982\u679c\u6570\u636e\u5e93\u4e0d\u5b58\u5728\uff0c\u4f1a\u8f93\u51fa\u9519\u8bef\u4fe1\u606f\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u521b\u5efa\u6570\u636e\u8868<\/h2>\n\n    \u521b\u5efa\u6570\u636e\u8868\u4f7f\u7528 \"CREATE TABLE\" \u8bed\u53e5\uff0c\u521b\u5efa\u6570\u636e\u8868\u524d\uff0c\u9700\u8981\u786e\u4fdd\u6570\u636e\u5e93\u5df2\u5b58\u5728\uff0c\u4ee5\u4e0b\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a sites \u7684\u6570\u636e\u8868\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"CREATE TABLE sites (name VARCHAR(255), url VARCHAR(255))\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6211\u4eec\u4e5f\u53ef\u4ee5\u4f7f\u7528 \"SHOW TABLES\" \u8bed\u53e5\u6765\u67e5\u770b\u6570\u636e\u8868\u662f\u5426\u5df2\u5b58\u5728\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"SHOW TABLES\"<\/span>)
  
 for <\/span><\/span>x in <\/span>mycursor:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u4e3b\u952e\u8bbe\u7f6e<\/h3>\n\n    \u521b\u5efa\u8868\u7684\u65f6\u5019\u6211\u4eec\u4e00\u822c\u90fd\u4f1a\u8bbe\u7f6e\u4e00\u4e2a\u4e3b\u952e\uff08PRIMARY KEY\uff09\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 \"INT AUTO_INCREMENT PRIMARY KEY\" \u8bed\u53e5\u6765\u521b\u5efa\u4e00\u4e2a\u4e3b\u952e\uff0c\u4e3b\u952e\u8d77\u59cb\u503c\u4e3a 1\uff0c\u9010\u6b65\u9012\u589e\u3002
\n   
 \u5982\u679c\u6211\u4eec\u7684\u8868\u5df2\u7ecf\u521b\u5efa\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528 ALTER TABLE \u6765\u7ed9\u8868\u6dfb\u52a0\u4e3b\u952e\uff1a\n  <\/div>\n\n \n      \n        \"brown\">\"brown\">\"brown\">\"brown\">\"brown\">\"brown\">\"brown\">\"codebox codeshow\"> \n       
 \n       \n         \"code\"> \n        
 \n        
 import <\/span><\/span>mysql.connector

  

 mydb = mysql.\"mediumblue\"<\/span><\/span><\/span>>connector.connect<\/span><\/span>( \n        
 \n        
   host= \n        \"localhost\"<\/span><\/span>, \n        
 \n        
   user= \n        \"root\"<\/span><\/span>, \n        
 \n        
   passwd= \n        \"123456\"<\/span><\/span>, \n        
 \n        
   database= \n        \"test_db\"<\/span><\/span> \n        
 \n        
 ) \n        
 \n        
 mycurs \n        or <\/span><\/span>= mydb. \n        cursor<\/span><\/span>() \n        
 \n        
   \n        
 \n        
 mycursor. \n        execute<\/span><\/span>( \n        \"ALTER TABLE sites ADD COLUMN id INT AUTO_INCREMENT PRIMARY KEY\"<\/span><\/span>) \n        
 \n        
 \n        
 \n       <\/div> \n       
 \n      <\/div>
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u5982\u679c\u4f60\u8fd8\u672a\u521b\u5efa sites \u8868\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u521b\u5efa\u3002\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"CREATE TABLE sites (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255), url VARCHAR(255))\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u63d2\u5165\u6570\u636e<\/h2>\n\n    \u63d2\u5165\u6570\u636e\u4f7f\u7528 \"INSERT INTO\" \u8bed\u53e5\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"INSERT INTO sites (name, url) VALUES (%s, %s)\"<\/span>
 val = (\"Lidihuo\"<\/span>, \"https:\/\/www.lidihuo.com\"<\/span>)
 mycursor.execute<\/span>(sql, val)
  
 mydb.commit<\/span>() # \u6570\u636e\u8868\u5185\u5bb9\u6709\u66f4\u65b0\uff0c\u5fc5\u987b\u4f7f\u7528\u5230\u8be5\u8bed\u53e5
<\/span>  
 print(mycursor.rowcount, \"\u8bb0\u5f55\u63d2\u5165\u6210\u529f\u3002\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u6279\u91cf\u63d2\u5165<\/h3>\n\n    \u6279\u91cf\u63d2\u5165\u4f7f\u7528 executemany() \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u5143\u7ec4\u5217\u8868\uff0c\u5305\u542b\u4e86\u6211\u4eec\u8981\u63d2\u5165\u7684\u6570\u636e\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"INSERT INTO sites (name, url) VALUES (%s, %s)\"<\/span>
 val = [
   ('Google'<\/span>, 'https:\/\/www.google.com'<\/span>),
   ('Github'<\/span>, 'https:\/\/www.github.com'<\/span>),
   ('Taobao'<\/span>, 'https:\/\/www.taobao.com'<\/span>),
   ('stackoverflow'<\/span>, 'https:\/\/www.stackoverflow.com\/'<\/span>)
 ]
  
 mycursor.executemany<\/span>(sql, val)
  
 mydb.commit<\/span>() # \u6570\u636e\u8868\u5185\u5bb9\u6709\u66f4\u65b0\uff0c\u5fc5\u987b\u4f7f\u7528\u5230\u8be5\u8bed\u53e5
<\/span>  
 print(mycursor.rowcount, \"\u8bb0\u5f55\u63d2\u5165\u6210\u529f\u3002\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u5982\u679c\u6211\u4eec\u60f3\u5728\u6570\u636e\u8bb0\u5f55\u63d2\u5165\u540e\uff0c\u83b7\u53d6\u8be5\u8bb0\u5f55\u7684 ID \uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"INSERT INTO sites (name, url) VALUES (%s, %s)\"<\/span>
 val = (\"Zhihu\"<\/span>, \"https:\/\/www.zhihu.com\"<\/span>)
 mycursor.execute<\/span>(sql, val)
  
 mydb.commit<\/span>()
  
 print(\"1 \u6761\u8bb0\u5f55\u5df2\u63d2\u5165, ID:\"<\/span>, mycursor.lastrowid)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u67e5\u8be2\u6570\u636e<\/h2>\n\n    \u67e5\u8be2\u6570\u636e\u4f7f\u7528 SELECT \u8bed\u53e5\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"SELECT * from <\/span>sites\"<\/span>)
  
 myresult = mycursor.fetchall<\/span>() # fetchall() \u83b7\u53d6\u6240\u6709\u8bb0\u5f55
<\/span>  
 for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u4ee3\u7801\uff0c\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a\n  <\/div>\n\n (1, 'Lidihuo'<\/span>, 'https:\/\/www.lidihuo.com'<\/span>)
 (2, 'Google'<\/span>, 'https:\/\/www.google.com'<\/span>)
 (3, 'Github'<\/span>, 'https:\/\/www.github.com'<\/span>)
 (4, 'Taobao'<\/span>, 'https:\/\/www.taobao.com'<\/span>)
 (5, 'stackoverflow'<\/span>, 'https:\/\/www.stackoverflow.com\/'<\/span>)
 (6, 'Zhihu'<\/span>, 'https:\/\/www.zhihu.com'<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u4e5f\u53ef\u4ee5\u8bfb\u53d6\u6307\u5b9a\u7684\u5b57\u6bb5\u6570\u636e\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"SELECT name, url from <\/span>sites\"<\/span>)
  
 myresult = mycursor.fetchall<\/span>()
  
 for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c:\n  <\/div>\n\n ('Lidihuo'<\/span>, 'https:\/\/www.lidihuo.com'<\/span>)
 ('Google'<\/span>, 'https:\/\/www.google.com'<\/span>)
 ('Github'<\/span>, 'https:\/\/www.github.com'<\/span>)
 ('Taobao'<\/span>, 'https:\/\/www.taobao.com'<\/span>)
 ('stackoverflow'<\/span>, 'https:\/\/www.stackoverflow.com\/'<\/span>)
 ('Zhihu'<\/span>, 'https:\/\/www.zhihu.com'<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u5982\u679c\u6211\u4eec\u53ea\u60f3\u8bfb\u53d6\u4e00\u6761\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528 fetchone() \u65b9\u6cd5\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"SELECT * from <\/span>sites\"<\/span>)
  
 myresult = mycursor.fetchone<\/span>()
  
 print(myresult)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\n  <\/div>\n\n (1, 'Lidihuo'<\/span>, 'https:\/\/www.lidihuo.com'<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u4e5f\u53ef\u4ee5\u4f7f\u7528\u901a\u914d\u7b26 %\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"SELECT * from <\/span>sites WHERE url LIKE '<\/span>%oo%'\"<\/span>
  
 mycursor.execute<\/span>(sql)
  
 myresult = mycursor.fetchall<\/span>()
  
 for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\n  <\/div>\n\n (1, 'Lidihuo'<\/span>, 'https:\/\/www.lidihuo.com'<\/span>)
 (2, 'Google'<\/span>, 'https:\/\/www.google.com'<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u4e3a\u4e86\u9632\u6b62\u6570\u636e\u5e93\u67e5\u8be2\u53d1\u751f SQL \u6ce8\u5165\u7684\u653b\u51fb\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 %s \u5360\u4f4d\u7b26\u6765\u8f6c\u4e49\u67e5\u8be2\u7684\u6761\u4ef6\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"SELECT * from <\/span>sites WHERE name = %s\"<\/span>
 na = (\"Lidihuo\"<\/span>, )
  
 mycursor.execute<\/span>(sql, na)
  
 myresult = mycursor.fetchall<\/span>()
  
 for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u6392\u5e8f<\/h2>\n\n    \u67e5\u8be2\u7ed3\u679c\u6392\u5e8f\u53ef\u4ee5\u4f7f\u7528
\n   ORDER BY<\/b> \u8bed\u53e5\uff0c\u9ed8\u8ba4\u7684\u6392\u5e8f\u65b9\u5f0f\u4e3a\u5347\u5e8f\uff0c\u5173\u952e\u5b57\u4e3a
\n   ASC<\/b>\uff0c\u5982\u679c\u8981\u8bbe\u7f6e\u964d\u5e8f\u6392\u5e8f\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u5173\u952e\u5b57
\n   DESC<\/b>\u3002\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"SELECT * from <\/span>sites ORDER BY name\"<\/span>
  
 mycursor.execute<\/span>(sql)
  
 myresult = mycursor.fetchall<\/span>()
  
 for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"SELECT * from <\/span>sites ORDER BY name\"<\/span>
  
 mycursor.execute<\/span>(sql)
  
 myresult = mycursor.fetchall<\/span>()
  
 for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\nLimit<\/h2>\n\n    \u5982\u679c\u6211\u4eec\u8981\u8bbe\u7f6e\u67e5\u8be2\u7684\u6570\u636e\u91cf\uff0c\u53ef\u4ee5\u901a\u8fc7 \"LIMIT\" \u8bed\u53e5\u6765\u6307\u5b9a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"SELECT * from <\/span>sites LIMIT 3\"<\/span>)
  
 myresult = mycursor.fetchall<\/span>()
  
 for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\n  <\/div>\n\n (1, 'Lidihuo'<\/span>, 'https:\/\/www.lidihuo.com'<\/span>)
 (2, 'Google'<\/span>, 'https:\/\/www.google.com'<\/span>)
 (3, 'Github'<\/span>, 'https:\/\/www.github.com'<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u4e5f\u53ef\u4ee5\u6307\u5b9a\u8d77\u59cb\u4f4d\u7f6e\uff0c\u4f7f\u7528\u7684\u5173\u952e\u5b57\u662f OFFSET\uff1a\u4ece\u7b2c\u4e8c\u6761\u5f00\u59cb\u8bfb\u53d6\u524d 3 \u6761\u8bb0\u5f55\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 mycursor.execute<\/span>(\"SELECT * from <\/span>sites LIMIT 3 OFFSET 1\"<\/span>) # 0 \u4e3a \u7b2c\u4e00\u6761\uff0c1 \u4e3a\u7b2c\u4e8c\u6761\uff0c\u4ee5\u6b64\u7c7b\u63a8
<\/span>  
 myresult = mycursor.fetchall<\/span>()
  
 for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\n  <\/div>\n\n (2, 'Google'<\/span>, 'https:\/\/www.google.com'<\/span>)
 (3, 'Github'<\/span>, 'https:\/\/www.github.com'<\/span>)
 (4, 'Taobao'<\/span>, 'https:\/\/www.taobao.com'<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u5220\u9664\u8bb0\u5f55<\/h2>\n\n    \u5220\u9664\u8bb0\u5f55\u4f7f\u7528
\n   \"DELETE FROM\"<\/b>\u8bed\u53e5,\u5220\u9664 name \u4e3a stackoverflow \u7684\u8bb0\u5f55\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"DELETE from <\/span>sites WHERE name = '<\/span>stackoverflow'\"<\/span>
  
 mycursor.execute<\/span>(sql)
  
 mydb.commit<\/span>()
  
 print(mycursor.rowcount, \" \u6761\u8bb0\u5f55\u5220\u9664\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n   \u6ce8\u610f\uff1a<\/span>\u8981\u614e\u91cd\u4f7f\u7528\u5220\u9664\u8bed\u53e5\uff0c\u5220\u9664\u8bed\u53e5\u8981\u786e\u4fdd\u6307\u5b9a\u4e86 WHERE \u6761\u4ef6\u8bed\u53e5\uff0c\u5426\u5219\u4f1a\u5bfc\u81f4\u6574\u8868\u6570\u636e\u88ab\u5220\u9664\u3002\n  <\/div>\n\n    \u4e3a\u4e86\u9632\u6b62\u6570\u636e\u5e93\u67e5\u8be2\u53d1\u751f SQL \u6ce8\u5165\u7684\u653b\u51fb\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 %s \u5360\u4f4d\u7b26\u6765\u8f6c\u4e49\u5220\u9664\u8bed\u53e5\u7684\u6761\u4ef6\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"DELETE from <\/span>sites WHERE name = %s\"<\/span>
 na = (\"stackoverflow\"<\/span>, )
  
 mycursor.execute<\/span>(sql, na)
  
 mydb.commit<\/span>()
  
 print(mycursor.rowcount, \" \u6761\u8bb0\u5f55\u5220\u9664\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u66f4\u65b0\u8868\u6570\u636e<\/h2>\n\n    \u6570\u636e\u8868\u66f4\u65b0\u4f7f\u7528
\n   \"UPDATE\"<\/b> \u8bed\u53e5,\u5c06 name \u4e3a Zhihu \u7684\u5b57\u6bb5\u6570\u636e\u6539\u4e3a ZH\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"UPDATE sites SET name = '<\/span>ZH' WHERE name = '<\/span>Zhihu'\"<\/span>
  
 mycursor.execute<\/span>(sql)
  
 mydb.commit<\/span>()
  
 print(mycursor.rowcount, \" \u6761\u8bb0\u5f55\u88ab\u4fee\u6539\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\n   \u6ce8\u610f\uff1a<\/span>UPDATE \u8bed\u53e5\u8981\u786e\u4fdd\u6307\u5b9a\u4e86 WHERE \u6761\u4ef6\u8bed\u53e5\uff0c\u5426\u5219\u4f1a\u5bfc\u81f4\u6574\u8868\u6570\u636e\u88ab\u66f4\u65b0\u3002\n  <\/div>\n\n    \u4e3a\u4e86\u9632\u6b62\u6570\u636e\u5e93\u67e5\u8be2\u53d1\u751f SQL \u6ce8\u5165\u7684\u653b\u51fb\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 %s \u5360\u4f4d\u7b26\u6765\u8f6c\u4e49\u66f4\u65b0\u8bed\u53e5\u7684\u6761\u4ef6\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"UPDATE sites SET name = %s WHERE name = %s\"<\/span>
 val = (\"Zhihu\"<\/span>, \"ZH\"<\/span>)
  
 mycursor.execute<\/span>(sql, val)
  
 mydb.commit<\/span>()
  
 print(mycursor.rowcount, \" \u6761\u8bb0\u5f55\u88ab\u4fee\u6539\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n\u5220\u9664\u8868<\/h2>\n\n    \u5220\u9664\u8868\u4f7f\u7528
\n   \"DROP TABLE\"<\/b> \u8bed\u53e5\uff0c
\n   IF EXISTS<\/b> \u5173\u952e\u5b57\u662f\u7528\u4e8e\u5224\u65ad\u8868\u662f\u5426\u5b58\u5728\uff0c\u53ea\u6709\u5728\u5b58\u5728\u7684\u60c5\u51b5\u624d\u5220\u9664\uff1a\n  <\/div>\n\n import <\/span>mysql.connector
  
 mydb = mysql.connector.connect<\/span>(
   host=\"localhost\"<\/span>,
   user=\"root\"<\/span>,
   passwd=\"123456\"<\/span>,
   database=\"test_db\"<\/span>
 )
 mycursor <\/span>= mydb.cursor<\/span>()
  
 sql = \"DROP TABLE if <\/span>EXISTS sites\"<\/span> # \u5220\u9664\u6570\u636e\u8868 sites
<\/span>  
 mycursor.execute<\/span>(sql)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n <\/body>
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