python 3.6 +pyMysql 操作mysql数据库(实例讲解)

################################################################# #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

# -*- coding: utf-8 -*-from my_code.work_tools import WorkToolsmysql = WorkTools.MysqlTools("localhost","testdbname","rootuername","passwd")#执行单行sqlret1 = 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)

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