Re: pl/tcl function to detect when a request has been canceled - Mailing list pgsql-hackers

On 6/8/18, 2:21 PM, "Andres Freund" <andres@anarazel.de> wrote:
    Not sure I quite understand what you mean. You're thinking of the case
    where you're processing rows one-by-one with a cursor? Or that a single
    spi call takes a long while to process the query?

The former, I believe. One example (lightly obfuscated):

spi_exec -array a "SELECT this,that from table where stuff..." {
    if {$use_cancel_pending && [cancel_pending]} {
        error "cancelled in ..."
    }
    do_something_with_array a
    more_business_code_here
    and_so_on...
}