带有时区名称zone vs offset的Oracle时间戳

这很容易测试

 create table foo ( tswtz TIMESTAMP WITH TIME ZONE);
    /

insert into foo values (TO_TIMESTAMP_TZ ('21-FEB-2009 18:00:00 -5:00', 'DD-MON-YYYY HH24:MI:SS TZH:TZM'));


insert into foo values (TO_TIMESTAMP_TZ ('21-FEB-2009 18:00:00 EST', 'DD-MON-YYYY HH24:MI:SS TZR'));
    select tswtz, extract(timezone_abbr from tswtz), extract(TIMEZONE_REGION from tswtz)
from foo;


TSWTZ         EXTRACT(TIMEZONE_ABBRFROMTSWTZ) EXTRACT(TIMEZONE_REGIONFROMTSWTZ)                                
------------- ------------------------------- ---------------------------------------------------------------- 
21-FEB-09 06.00.00.000000000 PM -05:00   UNK                          UNKNOWN                                                          
21-FEB-09 06.00.00.000000000 PM EST      EST                             EST                                                              

2 rows selected

我发现打开连接时在ODP.NET中设置时区和格式似乎可以解决这个问题:

OracleGlobalization info = conn.GetSessionInfo();
info.TimeZone = "Pacific/Auckland";
info.TimeStampFormat = "DD-MON-YYYY HH:MI:SS.FF AM";
info.TimeStampTZFormat = "DD-MON-YYYY HH:MI:SS.FF AM TZR";
conn.SetSessionInfo(info);