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python 3.6 +pyMysql 操作mysql数据库(实例讲解)
版本信息：python:3.6 mysql:5.7 pyMysql:0.7.11
#################################################################
#author: 陈月白
#_blogs: http://www.cnblogs.com/chenyuebai/
#################################################################
# -*- coding: utf-8 -*-
class MysqlTools():
"""
连接mysql
库、表操作
"""
def __init__(self,host,dbname,user,passwd,charset="utf8"):
self.host = host
self.dbname = dbname
self.user = user
self.passwd = passwd
self.charset = charset
def connectMysqlDatabase(self):
"""连接db"""
try:
#连接db
connect = pymysql.connect(host=self.host,user=self.user,passwd=self.passwd,db=self.dbname,charset=self.charset)
cursor = connect.cursor()
databaseConnectInfo = self.user + "@" + "self.host" + "/" + self.dbname
print("INFO:connect database %s success."%databaseConnectInfo)
return connect,cursor
except:
traceback.print_exc()
print("ERROR:FUNCTION connectMysqlDatabase connect mysql database failed.")
def executeSqlLine(self,sqlLine):
"""执行单条sql语句"""
if sqlLine and isinstance(sqlLine,str):
print("INFO:now start connect mysql dababase.")
connect,cursor = self.connectMysqlDatabase()
executeResult = ""
try:
#游标执行sql
cursor.execute(sqlLine)
executeResult = cursor.fetchall() #获取所有执行结果
cursor.close() #关闭游标
connect.commit() #确认提交
print("INFO:execute sql sucess. sqlLine = ", sqlLine)
except Exception as e:
print("ERROR：execute sql failed.errorInfo =",e)
print("ERROR:FUNCTION executeSql execute failed.sqlLine =",sqlLine)
connect.rollback() #回滚db
return str(e) + " sqlLine = " + sqlLine
#断开连接
connect.close()
print("INFO:connect closed.\n")
return executeResult
else:
print("ERROR:param sqlLine is empty or type is not str.sqlLine = ",sqlLine)
def executeBatchSql(self,sqlList):
"""
批量执行sql
exp: executeBatchSql([sql_1,
sql_2,
sql_3,
......
])
"""
finalResultList = []
if sqlList:
for sql in sqlList:
executeResult = self.executeSqlLine(sql)
finalResultList.append(executeResult)
else:
print("ERROR:param sqlList is empty.")
return finalResultList
测试代码：
# -*- coding: utf-8 -*-
from my_code.work_tools import WorkTools
mysql = WorkTools.MysqlTools("localhost","testdbname","rootuername","passwd")
#执行单行sql
ret1 = mysql.executeSqlLine("show databases")
#批量执行
ret2 = mysql.executeBatchSql([
"show databases",
"show tables",
"update students_info set name = '王大花D' where id = 2",
"select * from students_info",
"error sql test" #异常sql测试
])
print("ret1 = ",ret1)
print("---------------------")
for i in ret2:
print(i)
测试表：
执行结果：
ret1 = (('information_schema',), ('mysql',), ('performance_schema',), ('sakila',), ('sys',), ('testdb',), ('world',))
---------------------
(('information_schema',), ('mysql',), ('performance_schema',), ('sakila',), ('sys',), ('testdb',), ('world',))
(('students_info',),)
()
((1, '陈月白', 'male', 25, '20176666', '1351234'), (2, '王大花D', 'female', 19, '19920816', '10086'), (3, '李强新', 'male', 18, '19941025', '10000'), (4, '王鹏', 'male', 20, '19970405', '10010'), (5, '钟齐', 'male', 22, '19970420', '123456789'), (6, '王大花', 'female', 15, '19981024', '12345678'))
(1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'error sql test' at line 1") sqlLine = error sql test
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