How to manage values of 'special' time with the charger

Hi all

I want to import data from Google Transit in a DB Oracle (version 11).
My goal is to import the arrival_time and departure_time as a TIMESTAMP type attributes
The file to be imported has the following structure:

trip_id arrival_time departure_time, stop_id, stop_sequence, stop_headsign, pickup_type, drop_off_type, shape_dist_traveled
3307886, 06:33:00, 06:33:00, 6606, 4,.
3307886, 06: 34:50, 06: 34:50, 6596, 5.
3307886, 06: 36:09, 06: 36:09, 6611, 6,.
3307886, 06: 37:00, 06: 37:00, 6604, 7,.
3307886, 06: 37:42, 06: 37:42, 6601, 8.
3307886, 06: 38:24, 06: 38:24, 6612, 9,.
...........................
* 3348800, 24: 47:03: 24: 47:03, 3031, 61, *.
* 3348800, 24: 48:00: 24: 48:00, 4823, 62, *.

The problem is that "BOLD" marked lines have a time value greater than 24, and this is not possible with the charger.

In this case in the imported value the day must be incremented by 1 and time must begin with previousHours % 24.
for example

+ 3307886, 06:33:00,-> 3307886,'1970-01-01-06: 33:00 ',... +.
+ 3348800: 24: 47:03-> 3348800,'1970-01-02-00: 47:03',... +.

Thank you very much

is there a way to do this with sql loader? If so, is there a way to say that for the charger?

Thanks a lot for your help

was soon Markus

Published by: markusin on January 20, 2010 12:26 AM

Published by: markusin on January 20, 2010 12:26 AM

Hello Markus.
If you download files from the server that depends on the database, using external tables is an excellent choice. If you download files from a server that is remote from the database, external tables is not an option and you need to use SQL * Loader.

In both cases, you can create a function to be used for the processing of these data.

Your command file may look like this (untested)

LOAD DATA
APPEND
INTO TABLE target_table
FIELDS TERMINATED BY ','
TRAILING NULLCOLS
(  trip_id
 , arrival_time         "CONVERT_TIME(:arrival_time)"
 , departure_time       "CONVERT_TIME(:departure_time)"
 , stop_id
 , stop_sequence
 , stop_headsign
 , pickup_type
 , drop_off_type
 , shape_dist_traveled
)

Your function might look like this

CREATE OR REPLACE FUNCTION  convert_time
  (p_time_string  VARCHAR2)
  RETURN  TIMESTAMP
IS
  r_timestamp            TIMESTAMP;
  v_day_increment        PLS_INTEGER  := 0;
  v_hour_part            VARCHAR2(2);
  v_rest_of_time_string  VARCHAR2(6);
BEGIN
  v_hour_part           := SUBSTR(p_time_string, 1, 2);
  v_rest_of_time_string := SUBSTR(p_time_string, 3, 6);
  IF  v_hour_part = '24'
  THEN
    v_day_increment := 1;
    v_hour_part     := '00';
  END IF;
  r_timestamp := TO_TIMESTAMP(v_hour_part||v_rest_of_time_string, 'HH24:MI:SS') + v_day_increment;
  RETURN  r_timestamp;
END;
/

During testing, I found that the current month and year will be used for the timestamp instead of Jan 1970.

Hope this helps,
Luke

Please check the answer as helpful or response, if it is so. If this is not the case, further clarification.
Try to always provide create table and table insert to help members of the forum to help you.

Tags: Database

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