1、安装 pymysql 库
pip install pymysql
2、操作Mysql数据库
import pymysql # 打开数据库链接 db = pymysql.connect(host='数据库IP', port='3306', user='用户名', passwd='密码' , database='数据库') # 使用cursor()方法获取操作游标 cursor = db.cursor() # 使用execute()方法执行SQL语句 cursor.execute('SQL语句') # 使用 fetchone() 方法获取一条数据 data_one = cursor.fetchone() # 使用 fetchall()方法获取所有数据 data_all = cursor.fetchall() # 除了查询,其他修改操作(增,删,改) try: # 执行SQL语句 cursor.execute('SQL语句') # 提交到数据库执行 db.commit() except: # 发生错误时回滚 db.rollback() # 最后操作 cursor.close() # 关闭游标 db.close() # 关闭数据库
3、可以封装成类,和对应的方法
import pymysql class DBConnection: def __init__(self, ip='', port=3306, user='root', passwd='123456', db=''): self.ip = ip self.port = port self.user = user self.passwd = passwd self.db = db # 连接数据库 def getCon(self): try: conn =pymysql.connect( host=self.ip, port=self.port, user=self.user, passwd=self.passwd, database=self.db) return conn except pymysql.Error as e: print(f'mysqldb error :{e}') #查 def select(self, sql): try: con = self.getCon() cur = con.cursor() # 创建游标 cur.execute(sql) # 执行语句 result = cur.fetchall() # 匹配所有 return result except pymysql.Error as e: print(f'mysqldb error :{e}') finally: cur.close() con.close() # 改 def update(self, sql): try: con = self.getCon() cur = con.cursor() cur.execute(sql) con.commit() # 提交事务 except pymysql.Error as e: con.rollback() print(f'mysqldb error :{e}') finally: cur.close() con.close() # 增 def insert(self, sql): try: con = self.getCon() cur = con.cursor() cur.execute(sql) con.commit() except pymysql.Error as e: con.rollback() print(f'mysqldb error :{e}') finally: cur.close() con.close() # 删 def delete(self, sql): try: con = self.getCon() cur = con.cursor() cur.execute(sql) con.commit() except pymysql.Error as e: con.rollback() print(f'mysqldb error :{e}') finally: cur.close() con.close()