/*
        获取Oracle服务名
        1。查询注册表，获取oracle安装根目录
            如：HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\ORACLE_HOME   REG_SZ  E:\ORACLE\ORA92
            得知oracle服务名文件所在地：根目录\network\ADMIN\tnsnames.ora
           
        2。解析该文件，该文件结构如
            # ------------------------------------------------
            PORTAL =
            (DESCRIPTION =
                (ADDRESS_LIST =
                (ADDRESS = (PROTOCOL = TCP)(HOST = 134.104.52.6)(PORT = 1521))
                )
                (CONNECT_DATA =
                (SERVICE_NAME = portal)
                )
            )

 &n

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