Re^5: DBI, and date type SQLite

[NetWallah]

in reply to Re^4: DBI, and date type SQLite
in thread DBI, and date type SQLite

Hola, Nando ..

Disclaimer : I'm neither a DBA nor a DBI expert but...
It seems to me that the binding for "ORDER BY xxx", the xxx needs to be a FIELD-NAME, not a value, so, the resolution of the variable at that location should be completed before the "prepare" is executed. In other words, I don't think that can be bound to a "?" for "execute-time" binding.

Other style comments : (You did not ask, but this is a perl website, and sometimes we provide unsolicited advice that you are free to reject):

In your table row filling code, you add "\n", which will be ignored in HTML. I would suggest:

print
    $q->start_table({-border=>'1', -align=>'center',-cellpadding=>'6'}
+),"\n\n";
while ( @data = $sth->fetchrow_array()){
  print
    $q->start_Tr,"\n", # This '\n' is useful only in case someone read
+s the HTML source 
    map ({ td({-align=>'left'},decode("utf-8",$_) )."\n" } @data),
    $q->end_Tr,"\n";
}
print $q->end_table,"\n";

(Untested)

Another thing that would help is if you provided the SQL schema, including just a few records of your Sqlite db, so that we could recreate your problem.

Also, passing along something I just learned:
the parameter for 'julianday' is TEXT, not a 'DATE' type. Hopefully, your sqlite database has the fields defined as TEXT fields, and the bind parameter is also a date in text form.
In my tests, the dash (-) separator works, but slash (/) does not.

[NetWallah]

I guess I was mistaken about the "ORDER BY ?" provided at run-time - it seems to work fine.

The following code does deliver selected records:

Read more... (5 kB)

[Corion]

Using a placeholder within the ORDER BY clause happens to work with for example MySQL, but is not supported everywhere. Specifically when preparing a statement, the database driver must be enabled to create a query plan for the statement, whether placeholders are present or not. Placeholders for (e.g.) the table name or the order by clause prevent that.

[nando]

Thank you. There are many details to consider ... Therefore it is very interesting ;)

NetWallah has proven that we can use placeholder with SQLite driver in clause ORDER BY