Question

PLSQL转换日期是否有可能达到毫秒数？

我试过

select to_number(TO_CHAR(sysdate, 'yyyymmddhh24miss')) * (24 * 60 * 60 * 1000) from dual;

但我回来了1743604888943174400000

与java GetTime方法不同 https://www.w3resource.com/java-tutorial/util/date/java_date_gettime.php

Answer 1

正如swmcdonnell已经说过，你的问题有点被公开： oracle systimestamp (sysdate) to milliseconds

但是你有一个理解问题。我确实将您的查询拆分为三列。

SELECT TO_CHAR (SYSDATE, 'yyyymmddhh24miss'), -- Here we convert our sysdate into a 'string'
       TO_NUMBER (TO_CHAR (SYSDATE, 'yyyymmddhh24miss')), -- this will output the resulting string as number - it will look the same as the 1st column
       TO_NUMBER (TO_CHAR (SYSDATE, 'yyyymmddhh24miss')) * (24 * 60 * 60 * 1000) -- here you calculated 20180613150101 * 24 * 60... i think that's not what you want to do
  FROM DUAL;

这没有意义。如果你想要'total-milliseconds'，你必须：

使用current_timestamp而不是sysdate
将年份（yyyy）乘以365天* 24小时* 60分钟* 60秒* 1000毫秒
将日期（DDD）乘以24小时* 60分钟* 60秒* 1000毫秒
乘以小时* 60分钟* 60秒* 1000毫秒
乘以分钟* 60秒* 1000毫秒
乘以第二个* 1000毫秒
添加ms

这会导致类似这样的事情：

SELECT to_number(TO_CHAR (CURRENT_TIMESTAMP, 'yyyy')) * 365 * 24 * 60 * 60 * 1000
     + to_number(TO_CHAR (CURRENT_TIMESTAMP, 'DDD')) * 24 * 60 * 60 * 1000
     + to_number(TO_CHAR (CURRENT_TIMESTAMP, 'HH24')) * 60 * 60 * 1000
     + to_number(TO_CHAR (CURRENT_TIMESTAMP, 'mi')) * 60 * 1000
     + to_number(TO_CHAR (CURRENT_TIMESTAMP, 'ss')) * 1000
     + to_number(TO_CHAR (CURRENT_TIMESTAMP, 'FF'))
  FROM DUAL;

..但你会怎么做呢？我不知道Java但是时间戳不应该显示为间隔。这可能类似于oracle中的interval或C＃中的时间跨度。

Answer 2

SELECT TO_NUMBER(TO_CHAR(SYSDATE,'YYYYMMDDHHMISS'))||to_number(SUBSTR(TO_CHAR (CURRENT_TIMESTAMP, 'FF'),0,2)) FROM dual;

plsql日期为毫秒数

2 个答案: