Обсуждение: Change in casting behavior?

select (random( )*10)::varchar(4)
worked in 7.1.3

fails in 7.2

ERROR:  value too long for type character varying(4)

Thomas Swan writes:

> select (random( )*10)::varchar(4)
> worked in 7.1.3
>
> fails in 7.2
>
> ERROR:  value too long for type character varying(4)

Say what you really mean:

select substring(random()*10 for 4);

-- 
Peter Eisentraut   peter_e@gmx.net

Peter Eisentraut wrote:<br /><blockquote cite="midPine.LNX.4.30.0202152033550.681-100000@peter.localdomain"
type="cite"><prewrap="">Thomas Swan writes:<br /><br /></pre><blockquote type="cite"><pre wrap="">select (random(
)*10)::varchar(4)<br/>worked in 7.1.3<br /><br />fails in 7.2<br /><br />ERROR:  value too long for type character
varying(4)<br/></pre></blockquote><pre wrap=""><br />Say what you really mean:<br /><br />select substring(random()*10
for4);<br /><br /></pre></blockquote> That may be the better way to say it.  But, what I wanted to point out was that
thebehavior had changed.   Previously ::varchar(4) had worked. However, now since 7.2 only ::text or varchar(n) where
issufficiently large to hold the digits.<br /><br /> As far as I was aware the correct behavior was to truncate the
textrepresentation to fit the field size or the 'casted' size.<br /><br /> I simply thought I would mention as it
caughtme by surpris.<br /><br /> Thomas<br /><br /> 

Thomas Swan writes:

> As far as I was aware the correct behavior was to truncate the text representation to fit the
> field size or the 'casted' size.

The correct behaviour has been made even more correct in the 7.2 release.
;-)

> I simply thought I would mention as it caught me by surpris.

Should have read the release notes.

-- 
Peter Eisentraut   peter_e@gmx.net