numerus/revert/import_contact.sql

-- Revert numerus:import_contact from pg

begin;

drop function if exists numerus.end_import_contacts(integer);
drop function if exists numerus.begin_import_contacts();

commit;
Allow importing contacts from Holded This allows to import an Excel file exported from Holded, because it is our own user case. When we have more customers, we will give out an Excel template file to fill out. Why XLSX files instead of CSV, for instance? First, because this is the output from Holded, but even then we would have more trouble with CSV than with XLSX because of Microsoft: they royally fucked up interoperability when decided that CSV files, the files that only other applications or programmers see, should be “localized”, and use a comma or a semicolon to separate a comma separated file depending on the locale’s decimal separator. This is ridiculous because it means that CSV files created with an Excel in USA uses comma while the same Excel but with a French locale expects the fields to be separated by semicolon. And for no good reason, either. Since they fucked up so bad, decided to add a non-standard “meta” field to specify the separator, writing a `sep=,` in the first line, but this only works for reading, because saving the same file changes the separator back to the locale-dependent character and removes the “meta” field. And since everyone expects to open spreadsheet with Excel, i can not use CSV if i do not want a bunch of support tickets telling me that the template is all in a single line. I use an extremely old version of a xlsx reading library for golang[0] because it is already available in Debian repositories, and the only thing i want from it is to convert the convoluted XML file into a string array. Go is only responsible to read the file and dump its contents into a temporary table, so that it can execute the PL/pgSQL function that will actually move that data to the correct relations, much like add_contact does but in batch. In PostgreSQL version 16 they added a pg_input_is_valid function that i would use to test whether input values really conform to domains, but i will have to wait for Debian to pick up the new version. Meanwhile, i use a couple of temporary functions, in lieu of nested functions support in PostgreSQL. Part of #45 [0]: https://github.com/tealeg/xlsx 2023-07-02 22:05:47 +00:00			`-- Revert numerus:import_contact from pg`

			`begin;`

			`drop function if exists numerus.end_import_contacts(integer);`
			`drop function if exists numerus.begin_import_contacts();`

			`commit;`