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
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()
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()
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()
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