Trajectory参考的事件函数ST_eventTime_云数据库 RDS(RDS)-阿里云帮助中心

获得轨迹指定索引事件时间。

语法

timestamp ST_eventTime(trajectory traj, integer index) ;

参数

参数名称	描述
traj	轨迹对象。
index	事件索引序号。

示例

With traj AS (
  select '{"trajectory":{"version":1,"type":"STPOINT","leafcount":2,"start_time":"2010-01-01 11:30:00","end_time":"2010-01-01 12:30:00","spatial":"SRID=4326;LINESTRING(1 1,3 5)","timeline":["2010-01-01 11:30:00","2010-01-01 12:30:00"],"attributes":{"leafcount":2,"velocity":{"type":"integer","length":4,"nullable":true,"value":[1,null]},"speed":{"type":"float","length":8,"nullable":true,"value":[null,1.0]},"angel":{"type":"string","length":64,"nullable":true,"value":["test",null]}, "tngel2":{"type":"timestamp","length":8,"nullable":true,"value":["2010-01-01 12:30:00",null]},"bearing":{"type":"bool","length":1,"nullable":true,"value":[null,true]}},"events":[{"1":"Fri Jan 01 14:30:00 2010"}]}}'::trajectory a)
Select st_eventTime(a, 0 ) from traj;
    st_eventtime     
---------------------
 2010-01-01 14:30:00
(1 row)