1、使用
1.1 简单使用
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import pymysql # 创建连接 con = pymysql.connect( host = 'localhost' , port = 3306 , user = 'root' , password = '123456' , database = 'test' , charset = 'utf8' ) # 创建游标 cursor = con.cursor() # 执行新增SQL,返回受影响行数 row1 = cursor.execute( "insert into user (username, password) values ('username3','password3')" ) print (row1) # 执行更新SQL,返回受影响行数 row2 = cursor.execute( "update user set password = '123456' where id > 2;" ) # 执行查询SQL res = cursor.execute( "SELECT * FROM user;" ) result = cursor.fetchall() for info in result: print (info[ 0 ], info[ 1 ]) # 提交,不然无法保存新增或者更新的数据 con.commit() # 关闭游标 cursor.close() # 关闭连接 con.close() |
注意:数据库表中存在中文时,创建连接需要指定charset='utf8'
,否则中文显示会乱码。 其中cursor.fetchall()
是获取所有结果集,如果只有一条结果集,可以使用cursor.fetchone()
。
1.2 封装工具类
为了使用方便,可以直接封装成工具类:
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import pymysql class MysqlHelper: def __init__( self , config): self .host = config[ "host" ] self .port = config[ "port" ] self .user = config[ "user" ] self .password = config[ "password" ] self .db = config[ "db" ] self .charset = config[ "charset" ] self .con = None self .cursor = None def create_con( self ): """ 创建连接 """ try : self .con = pymysql.connect(host = self .host, port = self .port, user = self .user, password = self .password, database = self .db, charset = 'utf8' ) self .cursor = self .con.cursor() return True except Exception as e: print (e) return False # def close_con( self ): """ 关闭链接 """ if self .cursor: self .cursor.close() if self .con: self .con.close() # sql执行 def execute_sql( self , sql): """ 执行插入/更新/删除语句 """ try : self .create_con() print (sql) self .cursor.execute(sql) self .con.commit() except Exception as e: print (e) finally : self .close_con() def select( self , sql, * args): """ 执行查询语句 """ try : self .create_con() print (sql) self .cursor.execute(sql, args) res = self .cursor.fetchall() return res except Exception as e: print (e) return False finally : self .close_con() |
使用工具类:
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config = { "host" : 'localhost' , "port" : 3306 , "user" : 'root' , "password" : '123456' , "db" : 'test' , "charset" : 'utf8' } db = MysqlHelper(config) db.execute_sql( "insert into user (username, password) values ('username4','password4')" ) db.select( "SELECT * FROM user;" ) |
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原文链接:https://juejin.cn/post/7003200519103578126