It is indeed an interaction between Ima::DBI's use of prepare_cached and SQLite's changed error. Invalidating the $dbh->{CachedKids} is a passable work-around. I tried and failed to globally turn caching off in Ima::DBI::set_sql, but that probably would have caused performance issues anyway. I'm still not sure exactly which change revealed this problem.

DBD::SQLite seems to be the correct place to address this issue. Does anyone else have an opinion on that matter? Is there a better forum for DBD::SQLite discussions? The only other seems to be RT. 
$dbh->{CachedKids} = {}; # after ANALYZE or similar

# from the example
$dbh->prepare_cached('select "hello" from a');
print Dump $dbh->{CachedKids},"\n";
$dbh->{CachedKids} = {};
$dbh->do("analyze");
my $sth = $dbh->prepare_cached('select "hello" from a');
print "got ", $dbh->selectrow_array($sth), "\n";

[download]
A section of the DBI_TRACE from my main application 
 T  <- prepare_cached('SELECT me.id
FROM   step me
WHERE  ( me.message = ? )  
' undef ...)= DBIx::ContextualFetch::st=HASH(0x8e09f38) at DBI.pm line
+ 381
 T  <- FETCH('Active')= '' at DBI.pm line 1139
 T  <- FETCH('Taint')= 1 at ContextualFetch.pm line 50
    <- STORE('Taint' 0)= 1 at ContextualFetch.pm line 51
    !! ERROR: 1 'database schema has changed(1) at dbdimp.c line 421' 
+(err#0)
    <- execute('Removing duplicates')= undef at ContextualFetch.pm lin
+e 52
       ERROR: 1 'database schema has changed(1) at dbdimp.c line 421' 
+(err#0)
    <> FETCH('Statement')= 'SELECT me.id
FROM   step me
WHERE  ( me.message = ? )  
' ('Statement' from cache) at DBI.pm line 1143
Val::Step can't SELECT me.id
FROM   step me
WHERE  ( me.message = ? )  
: DBD::SQLite::st execute failed: database schema has changed(1) at db
+dimp.c line 421 [for Statement "SELECT me.id
FROM   step me
WHERE  ( me.message = ? )  
"] at /usr/share/perl5/DBIx/ContextualFetch.pm line 52.
 at bin/validate.pl line 196

[download]

In reply to Re: Upgraded SQLite: "database changed" error by bsb
in thread Upgraded SQLite: "database changed" error by bsb

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