PHP MySQL PDO SQLSTATE[HY000]: General error - php

Question

Please help fix "SQLSTATE[HY000]: General error:" in the following PHP script. Also, refer to the MySQL script in case.
<?php
# MySQL
$host = 'localhost';
$username = 'root';
$password = '';
$dbname = 'procdb';
try {
$pdo = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected to MySQL Server successfully." . "\n";
$sql = "CALL prepend('abcdefg', #inOutParam);";
$stmt = $pdo->query($sql);
do {
$rows = $stmt->fetchAll(PDO::FETCH_NUM);
if ($rows) {
foreach($rows as $row) {
print($row[0] . "\n");
}
}
} while ($stmt->nextRowset());
} catch (PDOException $e) {
#die("Could not connect to the database $dbname :" . $e->getMessage());
$error = $e->getMessage();
echo $error . "\n";
} catch (Exception $e) {
$error = $e->getMessage();
echo $error . "\n";
} finally {
$pdo = null;
echo "Connection closed." . "\n";
}
?>
Here's the MySQL Script:
DROP DATABASE IF EXISTS procdb;
DELIMITER $$
CREATE DATABASE procdb;$$
DELIMITER ;
USE procdb;
DROP PROCEDURE IF EXISTS prepend;
DELIMITER $$
CREATE PROCEDURE prepend
(
IN inParam VARCHAR(255),
INOUT inOutParam INT
)
BEGIN
DECLARE z INT;
SET z = inOutParam + 1;
SET inOutParam = z;
SELECT inParam;
SELECT CONCAT('zyxw', inParam);
END;$$
DELIMITER ;
USE procdb;
CALL prepend('abcdefg', #inOutParam);
/*
# Output
// (FieldName1 and its value)
inParam
'abcdefg'
// (FieldName2 and its value)
CONCAT('zyxw', inParam)
'zyxwabcdefg'
*/
What is the cause of the error? Note that adding "$stmt->close();" or "$stmt->closeCursor();" did not help.
Please help.
Thanks

Answer 1

Try this, line
$rows = $stmt->fetchAll(PDO::FETCH_NUM);
Outside While loop
try {
$pdo = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected to MySQL Server successfully." . "\n";
$sql = "CALL prepend('abcdefg', #inOutParam);";
$stmt = $pdo->query($sql);
$rows = $stmt->fetchAll(\PDO::FETCH_ASSOC);
foreach ($rows as $row) {
foreach ($row as $col) {
print $col . "\n";
}
}
$stmt->nextRowset();
$rows = $stmt->fetchAll(\PDO::FETCH_ASSOC);
foreach ($rows as $row) {
foreach ($row as $col) {
print $col . "\n";
}
}
} catch (PDOException $e) {
#die("Could not connect to the database $dbname :" . $e->getMessage());
$error = $e->getMessage();
echo $error . "\n";
} catch (Exception $e) {
$error = $e->getMessage();
echo $error . "\n";
} finally {
$pdo = null;
echo "Connection closed." . "\n";
}