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()
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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()
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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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到此这篇关于Python pymysql
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原文链接:https://juejin.cn/post/7003200519103578126