Re: Querying the schema for column widths - what syntax do I use?

Richard Huxton wrote:
> Howard Wilkinson wrote:
>> I am working on some upgrades to the MyDNS open source product. I
>> have some expertise in MySQL but am not overly familiar with
>> PostgreSQL and need some guidance on how to query the schema for the
>> maximum size of data a column can hold.
>
> Unless you're after PG-specific stuff, it's probably best to use the
> information-schema.
>
> http://www.postgresql.org/docs/8.3/static/information-schema.html
>
> This has a standard layout cross-database, so will help you to extend
> you app across other systems. I think it's supported in the latest
> version of MySQL too.
>
SO I can do something like this?

select character_maximum_length from information_schema.columns where
table_name='rr' and column_name='data';

Yes?

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Howard Wilkinson

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