Re^6: DBI, and date type SQLite

in reply to Re^5: DBI, and date type SQLite
in thread DBI, and date type SQLite

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:

use CGI;
use DBI;
use Encode;

my $q = CGI->new;

my $fecha= $q->param('theDate');

my $orden= $q->param('orden');

print $q->header, $q->start_html(-lang=>'es-SP',-title=> 'Reservas CPA
+'), $q->h2({-align=>'CENTER'},decode("utf-8","Reservas para el día: "
+)."$fecha ordenadas por $orden\n\n");

my $dbh = DBI->connect("dbi:SQLite:dbname=cpa-simple.db", "", "", {Rai
+seError =>1 } );

my $sth = $dbh->prepare( q ( select   
  id_reserva,activo,tipo_reserva,entidad_nombre_reserva,nombre,apellid
+os,telefono,inicio_reserva,
  fin_reserva,periodicidad,horai,
  horaf,nombre_admin 
from reserva,activos,nombre,administ 
where reserva.activos_reserva_id=activos.id_activos 
  and reserva.nombre_reserva_id=nombre.id_dni and reserva.administ_res
+erva_id=administ.id_administ 
  and julianday( ? ) between julianday ( inicio_reserva ) and julianda
+y ( fin_reserva ) 
order by ?)) or 
 die "No puedo preparar la sentencia: " .$dbh->errstr;

my @data;

$sth->execute("$fecha","$orden") or die "Algo está pasando... ¡Llama a
+ los bomberos!: " . $sth->errstr;
my @datautf8;
print
    $q->start_table({-border=>'1', -align=>'center',-cellpadding=>'6'}
+),"\n\n",
    $q->start_Tr,
    map ({$q->td({align=>'center'},$q->b(decode("utf-8",$_))) . "\n"}
          qw|Núm. Material Carácter Entidad Nombre Apellidos Teléfono 
+|,"Inicio de reserva","Fin de reserva",
             "Periódica","Hora inicio","Hora finalización","Administra
+dor"
         ),
    $q->end_Tr,"\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 ({ $q->td({-align=>'left'},decode("utf-8",$_) )."\n" } @data),
    $q->end_Tr,"\n";
}
print $q->end_table,"\n",
      $q->end_html,"\n";
$sth->finish;

$dbh->disconnect;

exit 0;
[download]

when run from the command line like this:

\test>perl dbtest.pl theDate=2011-12-25 orden=id_reserva
Content-Type: text/html; charset=ISO-8859-1

<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
         "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="es-SP" xml:lang="es-S
+P">
<head>
<title>Reservas CPA</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1
+" />
</head>
<body>
Wide character in print at dbtest.pl line 11.
<h2 align="CENTER">Reservas para el d&#8745;&#9488;&#9564;a: 2011-12-2
+5 ordenadas por id_reserva

</h2><table align="center" border="1" cellpadding="6">

Wide character in print at dbtest.pl line 33.
.... 8< snip --- 8<----
....
<tr>
<td align="left">39</td>
<td align="left">CANON FS-2
<td align="left">particular
<td align="left">DGA</td>
<td align="left">David</td>
<td align="left">Divo</td>
<td align="left">111222336<
<td align="left">2011-12-21
<td align="left">2012-03-04
<td align="left">7</td>
<td align="left">8</td>
<td align="left">21</td>
<td align="left">Alberto</t
</tr>
</table>

</body>
</html>
[download]

"XML is like violence: if it doesn't solve your problem, use more."

Comment on Re^6: DBI, and date type SQLite Select or Download Code

Replies are listed 'Best First'.
Re^7: DBI, and date type SQLite by Corion (Patriarch) on Oct 10, 2011 at 06:25 UTC
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.	[reply]
Re^8: DBI, and date type SQLite by nando (Acolyte) on Oct 10, 2011 at 06:52 UTC
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	[reply]

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