Greg Smith wrote: > A web site doc comment from user skong today points out a small issue > around the sample INSTR function given in plpgsql-porting.html that I > can't confirm (none of those dirty Oracle instances here today), but it > sounds legit. > > A look at Oracle's documentation on the INSTR function at > http://docs.oracle.com/cd/B28359_01/olap.111/b28126/dml_functions_1103.h tm > says that the 3rd input, position to start searching, cannot be zero. > skong says that Oracle will just return a 0 if you give it that invalid > input. > > The INSTR implementation in the docs will instead search backwards from > the end of the string if you tell it to start at 0, same as if you gave > it a negative input. I think it's therefore possible to get the plpgsql > version to return a value in cases Oracle would instead return 0. Seems > like a straightforward thing to confirm and change the sample to do > differently; just have to add an explicit test for a 0 value of beg_index.
I can confirm that Oracle returns 0 if the third argument to INSTR is 0. Yours, Laurenz Albe -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
