Use ST_SetAkId to set the AccessKeyId of a trajectory stored in external storage-PolarDB(PolarDB)-阿里云帮助中心

Sets the AccessKeyId of a trajectory stored in external storage.

Note

This function is expected to be deprecated in a later version. Use Cold data tiered storage for a better experience.

Syntax

trajectory ST_SetAkId(trajectory traj, text akid, bool checkvalid default true);

Parameters

Parameter	Description
traj	The trajectory object.
akid	The AccessKeyId used to access OSS.
checkvalid	Specifies whether to verify the validity. Default value: `true`. If the value is `true`, the system attempts to access OSS by using the newly set AccessKey and reports an error if the access fails.

Description

Resets the AccessKeyId used to access external storage.

To read a trajectory from OSS external storage, you must provide an AccessKey pair. Each AccessKey pair consists of an AccessKeyId and an AccessKeySecret, which can be understood as a username and a password.

Examples

SELECT ST_SetAKId(traj, '<OSS_USER>') FROM trajs;
                                                                                                                                                                                                                                               st_setakid                                                                                                                                                                                                                                               
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 {"trajectory":{"version":1,"type":"STPOINT","leafcount":6,"start_time":"Sat Jan 01 03:15:42 2000","end_time":"Sat Jan 01 05:16:43 2000","spatial":"LINESTRING(2 2 0,33.042158099636 36.832684322819 0,47.244002354518 47.230026333034 0,64.978971942887 60.618813472986 0,77.621717839502 78.012496630661 0,80 78 0)","timeline":["Sat Jan 01 03:15:42 2000","Sat Jan 01 03:39:54 2000","Sat Jan 01 04:04:06 2000","Sat Jan 01 04:28:18 2000","Sat Jan 01 04:52:31 2000","Sat Jan 01 05:16:43 2000"]}}
 {"trajectory":{"version":1,"type":"STPOINT","leafcount":6,"start_time":"Sat Jan 01 03:15:42 2000","end_time":"Sat Jan 01 05:16:43 2000","spatial":"LINESTRING(2 2 0,33.042158099636 36.832684322819 0,47.244002354518 47.230026333034 0,64.978971942887 60.618813472986 0,77.621717839502 78.012496630661 0,80 78 0)","timeline":["Sat Jan 01 03:15:42 2000","Sat Jan 01 03:39:54 2000","Sat Jan 01 04:04:06 2000","Sat Jan 01 04:28:18 2000","Sat Jan 01 04:52:31 2000","Sat Jan 01 05:16:43 2000"]}}
 {"trajectory":{"version":1,"type":"STPOINT","leafcount":6,"start_time":"Sat Jan 01 03:15:42 2000","end_time":"Sat Jan 01 05:16:43 2000","spatial":"LINESTRING(2 2,33.042158099636 36.832684322819,47.244002354518 47.230026333034,64.978971942887 60.618813472986,77.621717839502 78.012496630661,80 78)","timeline":["Sat Jan 01 03:15:42 2000","Sat Jan 01 03:39:54 2000","Sat Jan 01 04:04:06 2000","Sat Jan 01 04:28:18 2000","Sat Jan 01 04:52:31 2000","Sat Jan 01 05:16:43 2000"]}}
 TRAJECTORY EMPTY
(4 rows)