Unable to retrieve data from SQLite using PHP - php

Question

This is my first try to use SQLite, I am trying to retrieve data from SQLite but am not getting success neither its throwing any exceptions.
my respective code is as follows:
$sql_query = "SELECT * FROM `item` WHERE combo LIKE '" . $value . "' LIMIT 1;";
try {
/*** connect to SQLite database ***/
$dbh = new PDO("sqlite:src/mydb.s3db");
foreach ($dbh->query($sql_query) as $row) {
$name = $row['name'];
echo "name".$name;
$style = $row['style'];
echo $style;
$appr = $row['appr'];
echo $appr;
$style = $row['style'];
echo $style;
}
} catch(PDOException $e) {
//echo $e -> getMessage();
echo "problem with DB";
echo "<br>";
}
Kindly guide me through this.
Thank you.
//phpnifo();
PDO
PDO support enabled |
PDO drivers mysql, sqlite, sqlite2
pdo_sqlite
PDO Driver for SQLite 3.x enabled |
PECL Module version (bundled) 1.0.1 $Id: pdo_sqlite.c 293036 2010-01-03 09:23:27Z sebastian $
SQLite Library 3.3.7

Answer 1

a) Tell PDO that you want it to use exceptions for reporting errors
$dbh = new PDO("sqlite::memory:");
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
b) instead of putting the payload paraemters into the sql statement use prepared parametrized statements
try {
$stmt = $dbh->prepare( 'SELECT * FROM `item` WHERE combo LIKE ? LIMIT 1' );
$stmt->execute( array($value) );
foreach( $stmt as $row ) { ...
c) If you still don't get any output try code that unconditionally prints something. E.g. a SELECT Count(*) will always return at least one record (if no error occurs).
$stmt = $dbh->prepare( 'SELECT Count(*) as cnt FROM `item` WHERE combo LIKE ?' );
$stmt->execute( array($value) );
foreach( $stmt as $row ) {
echo 'Count: ', $row['cnt'], "\n";
}
$stmt = null;
edit: self-contained example
<?php
ini_set('display_errors', true);
error_reporting(E_ALL);
echo "start\n";
try {
$dbh = new PDO("sqlite::memory:");
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
setup($dbh);
$stmt = $dbh->prepare('SELECT * FROM item WHERE combo LIKE ? LIMIT 1');
$stmt->execute( array('comboB') );
foreach( $stmt as $row ) {
echo
$row['name'], " ",
$row['style'], " ",
$row['appr'], "\n"
;
}
}
catch(Exception $ex) {
var_dump($ex);
}
echo "done.\n";
function setup($dbh) {
$dbh->exec('
CREATE TABLE item (
combo TEXT,
name TEXT,
style TEXT,
appr TEXT
)
');
$stmt = $dbh->prepare('INSERT INTO item (combo,name,style,appr) VALUES (?,?,?,?)');
$stmt->execute( array('comboA','nameA','styleA','apprA') );
$stmt->execute( array('comboB','nameB','styleB','apprB') );
$stmt->execute( array('comboC','nameC','styleC','apprC') );
}