HI, Btw, you can do the above scenario with the external script, by making a shell script that writes to a named pipe. It will block until something reads from the pipe, which would be the CONNECT engine. Once the pipe closes (because CONNECT has finished) just loop and write to the pipe again. --Justin On Sat, Jun 13, 2015 at 5:03 PM, Justin Swanhart <greenlion@gmail.com> wrote:
Hi,
What would really be nice is a CONNECT storage type that could execute a program and read the output. For security, it would only run executables owned by the user the database is running as, setuid the user the database is running as, or executable files could be restricted to those in the data directory, but it could never follow symlinks. You could have something like: create table test ( ... ) engine=CONNECT readonly=1 -- must be true header=1 table_type=exec_program option_list='output=csv' FILE_NAME="process_flatfile.sh /path/to/flatfile.txt"
This would execute the shell script, which would format the output, and return the data as CSV, as specified in option_list.
Regards,
On Sat, Jun 13, 2015 at 4:20 PM, Justin Swanhart <greenlion@gmail.com> wrote:
Hi,
If it it read only, why don't you just import it with load data infile periodically, such as every 30 seconds? Load into new table then swap, just like you would a materialized view. LOAD DATA INFILE handles fixed width files if you do: LOAD DATA INFILE ... FIELDS DELIMITED BY '';
If the fixed with LOAD DATA INFILE won't work, then just load the file with a delimiter that does not exist in the file, so that all lines are treated as a single value. Use the LOAD DATA ... SET syntax combined with SUBSTR() to extract the columns. It isn't too difficult to make it work, but it might require a little trial and error.
Here is a very old blog post with a trick to get "top" like output in the database without having to run the "top" tool. It uses the LOAD DATA ... SET technique, so it will give you something to go on: http://swanhart.livejournal.com/131541.html and http://swanhart.livejournal.com/131788.html
Regards,
--Justin
On Sat, Jun 13, 2015 at 4:05 PM, Roberto Spadim <roberto@spadim.com.br> wrote:
I was trying the HEADER=1 but don`t work, check what i`m trying to do:
create table teste( ticker char(68) not null, ts timestamp not null field_format='II', (this should be a time64_t value) bid double not null, ask double not null, last double not null, volume bigint not null, unknown char(2) not null ) engine=CONNECT readonly=1 header=1 table_type=bin offset=432 (this don`t exists) option_list='eof=1' lrecl =110 (record size) FILE_NAME='/home/mysql/data/ticks.dat'
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