Connector for Python

1、数据库连接

import mysql.connector
config={'host':'127.0.0.1',#默认127.0.0.1
        'user':'root',
        'password':'123456',
        'port':3306 ,#默认即为3306
        'database':'test',
        'charset':'utf8'#默认即为utf8
        }
try:
  cnn=mysql.connector.connect(**config)
except mysql.connector.Error as e:
  print('connect fails!{}'.format(e))

2、创建表

sql_create_table='CREATE TABLE `student` ＼
(`id` int(10) NOT NULL AUTO_INCREMENT,＼
`name` varchar(10) DEFAULT NULL,＼
`age` int(3) DEFAULT NULL,＼
PRIMARY KEY (`id`)) ＼
ENGINE=MyISAM DEFAULT CHARSET=utf8'
cursor=cnn.cursor()
try:
  cursor.execute(sql_create_table)
except mysql.connector.Error as e:
  print('create table orange fails!{}'.format(e)) 

3、插入数据

cursor=cnn.cursor()
try:
  '第一种：直接字符串插入方式'
  sql_insert1="insert into student (name, age) values ('orange', 20)"
  cursor.execute(sql_insert1)
  '第二种：元组连接插入方式'
  sql_insert2="insert into student (name, age) values (%s, %s)"
  #此处的%s为占位符，而不是格式化字符串，所以age用%s
  data=('shiki',25)
  cursor.execute(sql_insert2,data)
  '第三种：字典连接插入方式'
  sql_insert3="insert into student (name, age) values (%(name)s, %(age)s)"
  data={'name':'mumu','age':30}
  cursor.execute(sql_insert3,data)
  #如果数据库引擎为Innodb，执行完成后需执行cnn.commit()进行事务提交
except mysql.connector.Error as e:
  print('insert datas error!{}'.format(e))
finally:
  cursor.close()
  cnn.close()

4、查询操作

cursor=cnn.cursor()
try:
  sql_query='select id,name from student where  age > %s'
  cursor.execute(sql_query,(21,))
  for id,name in cursor:
    print ('%s＼'s age is older than 25,and her/his id is %d'%(name,id))
except mysql.connector.Error as e:
  print('query error!{}'.format(e))
finally:
  cursor.close()
  cnn.close()

5、删除操作

cursor=cnn.cursor()
try:
  sql_delete='delete from student where name = %(name)s and age < %(age)s'
  data={'name':'orange','age':24}
  cursor.execute(sql_delete,data)
except mysql.connector.Error as e:
  print('delete error!{}'.format(e))
finally:
  cursor.close()
  cnn.close()