5 print(time.mktime(time.localtime())) #struct_time to timestamp 6 print('-'*20) 7 8 # 【生成struct_time时间元组】 9 # timestamp to struct_time 【本地时间】 10 print(time.localtime()) 11 print(time.localtime(time.time())) 12 print('-'*20) 13 # timestamp to struct_time ...
TIMESTAMP_ISO(expression) expression An expression that returns a value of one of the following built-in data types: a timestamp, a date, a time, a character string, or a graphic string. Ifexpressionis a character or graphic string, its value must be a valid string representation of a ...
to_timestamp(string, format)函数用于将字符串 string 按照 format 格式转换为 timestamp with time zone 类型。 SELECTto_timestamp('2020-03-15 19:08:00.678','YYYY-MM-DD HH24:MI:SS.MS');to_timestamp|---|2020-03-1519:08:00.678+08| 其中,HH24 表示 24 小时制的小时;MI 表示分钟;SS 表示...
/// Converts a UNIX nanoseconds timestamp to an ISO 8601 (RFC 3339) format string. #[inline] #[must_use] pub fn unix_nanos_to_iso8601(unix_nanos: UnixNanos) -> String { let dt = DateTime::<Utc>::from(UNIX_EPOCH + Duration::from_nanos(unix_nanos.as_u64())); dt.to_rfc3339...
>>-TIMESTAMP_ISO--(--expression--)--->< expression An expression that returns a value of one of the following built-in data types: a timestamp, a date, a time, a character string, or a graphic string. If expression is a character or graphic string, it must not be a CLOB ...
importjava.sql.Timestamp;importjava.text.ParseException;importjava.text.SimpleDateFormat;importjava.util.ArrayList;importjava.util.Date;importjava.util.List;publicclassTimeComparisonDemo{publicstaticTimestampstringToTimestamp(StringtimeStr)throwsParseException{SimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd...
TTL(Time-to-Live)机制: 基于时间戳自动删除过期桶,节省存储空间。 示例: 保留最近30天的数据: sql DELETE FROM hourly_metrics WHERE bucket_start < NOW() - INTERVAL '30 days'; 冷热数据分离: 将时间戳较早的桶迁移到低成本存储(如从SSD到HDD或S3)。
class ZoneConfig{ public static final ZoneId APP_ZONE_ID = ZoneId.of("UTC+8"); } class StudentDto{ String id; ZonedDateTime entryTime; public static updateEntity(Student student){ student.setEntryTime(LocalDateTime.ofInstant(now.toInstant(),APP_ZONE_ID)); } } class Student{ String id;...
Convert Epoch Time (seconds, ms, µs, ns) or Date-Time String Convert GMT :Tue, 29 Apr 2025 03:33:21 GMT Local Time (Your Time Zone) :4/29/2025, 11:33:21 AM Local Time Zone :Asia/Shanghai ISO-8601 Format :2025-04-29T03:33:21.940Z ...
这里不详细展开了,从to_timestamp内置函数的注释就可以看出,目前只支持前面两种日期格式,因此暂时没办法用Spark内置函数来支持更广义的字符串转timestamp功能。 Spark UDF设计 为了实现更完善的字符串转timestamp功能,我们只能通过拓展UDF的方法来实现,实现代码如下。 def main(argv: Array[String]): Unit = { val ...