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首頁 云數據庫 RDS RDS PostgreSQL數據庫 時空引擎（GanosBase） Trajectory SQL參考 SQL參考手冊 屬性元數據 ST_attrType

ST_attrType

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獲得軌跡屬性類型。

語法

text ST_attrType(trajectory traj, integer index) ;
text ST_attrType(trajectory traj, text name) ;

參數

參數名稱

描述

traj

軌跡對象。

i?ndex

索引軌跡項。

name

屬性名稱。

描述

返回描述屬性類型的字符串為以下幾種之一：

  • integer

  • float

  • string

  • timestamp

  • bool

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]}}}}'::trajectory a)
Select st_attrType(a, 0) from traj;
 st_attrtype 
-------------
 integer
(1 row)

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]}}}}'::trajectory a)
Select st_attrType(a, 'velocity') from traj;
 st_attrtype 
-------------
 integer
(1 row)