checking presence of table columns in mysql

[Brian Tafoya]

Use the "SHOW TABLE STATUS;" SQL statement and it will display all of the
tables within the selected database. You will find information on
DBI/DBD::mysql in the Perldocs, or on www.perldoc.org

Brian

----- Original Message -----
From: "Lynn David Newton" <lynn.newton@cox.net>
To: <plug-discuss@lists.plug.phoenix.az.us>
Sent: Tuesday, February 11, 2003 6:51 AM
Subject: Re: checking presence of table columns in mysql


>
>   >> Since there seems to be some mysql expertise on
>   >> the list: Does anyone know of a SQL based way to
>   >> check for the existence of a particular column by
>   >> name? This came up in work today. I've never been
>   >> able to do it. I'm not so sure it's possible.
>
>   George> Not purely sql, but close:
>   George> mysql -uwhomever -ppassword -hhost database -e "describe table"
| grep
>   George> fieldnamee
>
>   George> For example:
>   George> $ mysql -uuser -ppassword -haaron database -e "describe day" |
grep -c
>   George> create_ts
>   George> 1
>
> Right, I've done that. That's something that's simple
> in the shell. I was looking for something that works
> through Perl. Yeah, I could run system("blah blah") and
> munge the data, but that's so primitive.
>
> As it turns out, the statement handle attributes in DBI
> inherit all the metadata one is likely to be interested
> in: number of fields, field names, field types, etc.
> That's the sophisticated way to go.
>
> Thanks for your suggestion.
>
> --
> Lynn David Newton
> Phoenix, AZ
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