1.通过 pip 安装 pymysql
进入 cmd 输入 pip install pymysql
回车等待安装完成;
安装完成后出现如图相关信息,表示安装成功。
2.测试连接
import pymysql #导入 pymysql ,如果编译未出错,即表示 pymysql 安装成功
简单的增删改查操作
示例表结构
2.1查询操作
- import pymysql #导入 pymysql
- #打开数据库连接
- db= pymysql.connect(host="localhost",user="root",
- password="123456",db="test",port=3307)
- # 使用cursor()方法获取操作游标
- cur = db.cursor()
- #1.查询操作
- # 编写sql 查询语句 user 对应我的表名
- sql = "select * from user"
- try:
- cur.execute(sql) #执行sql语句
- results = cur.fetchall() #获取查询的所有记录
- print("id","name","password")
- #遍历结果
- for row in results :
- id = row[0]
- name = row[1]
- password = row[2]
- print(id,name,password)
- except Exception as e:
- raise e
- finally:
- db.close() #关闭连接
2.2插入操作
- import pymysql
- #2.插入操作
- db= pymysql.connect(host="localhost",user="root",
- password="123456",db="test",port=3307)
- # 使用cursor()方法获取操作游标
- cur = db.cursor()
- sql_insert ="""insert into user(id,username,password) values(4,'liu','1234')"""
- try:
- cur.execute(sql_insert)
- #提交
- db.commit()
- except Exception as e:
- #错误回滚
- db.rollback()
- finally:
- db.close()
2.3更新操作
- import pymysql
- #3.更新操作
- db= pymysql.connect(host="localhost",user="root",
- password="123456",db="test",port=3307)
- # 使用cursor()方法获取操作游标
- cur = db.cursor()
- sql_update ="update user set username = '%s' where id = %d"
- try:
- cur.execute(sql_update % ("xiongda",3)) #像sql语句传递参数
- #提交
- db.commit()
- except Exception as e:
- #错误回滚
- db.rollback()
- finally:
- db.close()
2.4删除操作
- import pymysql
- #4.删除操作
- db= pymysql.connect(host="localhost",user="root",
- password="123456",db="test",port=3307)
- # 使用cursor()方法获取操作游标
- cur = db.cursor()
- sql_delete ="delete from user where id = %d"
- try:
- cur.execute(sql_delete % (3)) #像sql语句传递参数
- #提交
- db.commit()
- except Exception as e:
- #错误回滚
- db.rollback()
- finally:
- db.close()