[ic] [import] update not overwrite

[interchange-users@icdevgroup.org (Kevin Walsh)]

> 
> I am trying to do a multiple checkbox add (results.html) to space delimited
> field in arbitrary db via a second receiving page and [import] tag. I was
> advised that this [import] tag I speak of will work as a faux update =>
> appending data to a field based on an existing "code".
> 
> [search-region stuff]
> 
> <FORM ACTION="[process-target]" METHOD="POST">
> [search-list]
>     stuff here
> <INPUT TYPE=checkbox NAME=media_add VALUE="[item-code] ">
>     stuff here
> [/search-list]
> 
> ...
> 
> ------------------
> Then in add_media.html I have:
> ------------------
>
> [flag type=write table=mediabox]
> [import table=mediabox type=LINE continue=NOTES]
> code: [cgi boxcode]
> parent: [cgi data session username]
> media: [cgi media_add]
> [/import]
>
> I have to pass ALL columns in mediabox that I wish not to be overwritten,
> because this will overwrite. Also, in the space separated area I get
> 
> da00001 &#0;da00002 &#0;da00003
> 
> I see my sku, followed by a space, then a &#0;  What is that?
> 
The "&#0;" is an encoded NULL character.  Multiple (stacked)
instances of a single CGI variable will be separated with a
single NULL.

Change this line:

    <INPUT TYPE=checkbox NAME=media_add VALUE="[item-code] ">

...to this:

    <INPUT TYPE=checkbox NAME=media_add VALUE="[item-code]">

(remove the space)

Then change this line in your [import]:

    media: [cgi media_add]

...to use the "null_to_space" filter, like this:

    media: [cgi name="media_add" filter="null_to_space" keep=1]

That will give you a list of "media_add" CGI variables, separated
with a single space.

>
> Can anybody confirm if [import] will act like an update, and not a complete
> overwrite?
>
I'm sure someone will correct me if I'm wrong, but I'm reasonably
sure that the [import] tag will overwrite any column you specify
with the new value you supply.

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