python3使用cx_Oracle连接oracle时，怎么传参sid或service_name

使用cx_Oracle.makedsn连接oracle数据库时，如果用Service name不用SID，应该如下传参。

dns_tns=cx_Oracle.makedsn('host',port,service_name='service_name')

如果用SID不用Service name，应该如下传参。

dns_tns=cx_Oracle.makedsn('host',port,'sid_info')

或

dns_tns=cx_Oracle.makedsn('host',port,sid='sid_info')

import cx_Oracle as cx
from quartz.comm.config import confSql
class OraclePy():
    def __init__(self,userName,password,host,port,connType,service_name): # 标识是根据SID还是SERVICE_NAME连接
        self.userName = userName
        self.password = password
        self.host = host
        self.port = port
        if (connType == 'SID'):
            self.con = cx.connect(self.userName, self.password, cx.makedsn(self.host, self.port, service_name))
            self.cursor = self.con.cursor()
        elif(connType == "SERVICE_NAME"):
            dns_tns = cx.makedsn(self.host, self.port, service_name=service_name)
            self.con = cx.connect(self.userName,self.password,dns_tns)
            self.cursor = self.con.cursor()
        else:print("不支持的数据库连接方式，当前只支持SID和SERVICE_NAME")

    # 批量执行增删改sql
    def executeSqls(self,sqls):
        for sql in sqls:
            self.cursor.execute(sql)
            self.con.commit()
        # self.cursor.close
        # self.con.close


    # 更新交易表
    def updateTxnCtrl(self,sql,idTxn):
        sql = sql.replace("IDTXN",str(idTxn))
        self.cursor.execute(sql)
        self.con.commit()
    def updateTxnCtrl1(self,sql,tunnelValue,idTxn):
        sql = sql.replace('tunnelValue',str(tunnelValue)).replace("IDTXN",str(idTxn))
        self.cursor.execute(sql)
        self.con.commit()
        # self.cursor.close
        # self.con.close

        # 更新交易表
    def updateTxnCtrl2(self, sql,value1 , value2, idTxn):
        sql = sql.replace('tunnelValue1', str(value1)).replace('tunnelValue2', str(value2)).replace("IDTXN",str(idTxn))
        self.cursor.execute(sql)
        self.con.commit()
        # self.cursor.close
        # self.con.close
    # 查询清分明细表
    def ClrTxnListQuery(self,sql,idTxn):
        sql = sql.replace('idTxn',str(idTxn))
        self.cursor.execute(sql)
        col = []
        resultSets = []
        for i in self.cursor.description:
            col.append(i[0])
        for data in self.cursor.fetchall():
            list2 = (list(data))
            resultSets.append(dict(map(lambda x, y: [x, y], col, list2)))
        return resultSets

    def T_RPT_INAMT(self,sql):
        self.cursor.execute(sql)
        col = []
        resultSets = []
        for i in self.cursor.description:
            col.append(i[0])
        for data in self.cursor.fetchall():
            list2 = (list(data))
            resultSets.append(dict(map(lambda x, y: [x, y], col, list2)))
        return resultSets

    # 关闭数据连接
    def disConnection(self):
        self.cursor.close
        self.con.close

if __name__ == '__main__':
    #conn = OraclePy('partner','partner','192.168.127.121',1530,'SID','billdb')
    conn = OraclePy('QAMODIFY', 'bfjwc0qocjp0dlgf', '192.168.6.42', 1530, 'SERVICE_NAME', 'vposdbtaf')
    sql = "select t.* from expt t "
    TrptInamt = conn.T_RPT_INAMT(sql)
    print(len(TrptInamt))
    print(TrptInamt)
    conn.disConnection()