PDO Update Help executing pdo update - php

Question

The function is pretty straightforward:
The variables: $table is the table which the update is taking place
and $fields are the fields in the table,
and $values are generated from a post and put into the $values array
and $where is the value of the id of the index field of the table
and $indxfldnm is the index field name
function SQLUpdate($table,$fields,$values,$where,$indxfldnm) {
//Connect to DB
$dbaddr = DB_HOST;
$dbusr = DB_USER;
$dbpwd = DB_PASSWORD;
$dbname = DB_DATABASE;
$db = new PDO('mysql:host='.$dbaddr .';dbname='.$dbname.';charset=UTF8', $dbusr, $dbpwd);
//build the fields
$buildFields = '';
if (is_array($fields)) {
//loop through all the fields
foreach($fields as $key => $field) :
if ($key == 0) {
//first item
$buildFields .= $field;
} else {
//every other item follows with a ","
$buildFields .= ', '.$field;
}
endforeach;
} else {
//we are only inserting one field
$buildFields .= $fields;
}
//build the values
$buildValues = '';
if (is_array($values)) {
//loop through all the values
foreach($values as $key => $value) :
if ($key == 0) {
//first item
$buildValues .= '?';
} else {
//every other item follows with a ","
$buildValues .= ', ?';
}
endforeach;
} else {
//we are only updating one field
$buildValues .= ':value';
}
$sqlqry = 'UPDATE '.$table.' SET ('.$buildFields.' = '.$buildValues.') WHERE `'.$indxfldnm.'` = \''.$where.'\');';
$prepareUpdate = $db->prepare($sqlqry);
//execute the update for one or many values
if (is_array($values)) {
$prepareUpdate->execute($values);
} else {
$prepareUpdate->execute(array(':value' => $values));
}
//record and print any DB error that may be given
$error = $prepareUpdate->errorInfo();
if ($error[1]) print_r($error);
echo $sqlqry;
return $sqlqry;
}
So far so good
However its not working
there is something wrong with transferring the values into the fields in a proper update statement
but I'm not so good with pdo and setting it up
a little help to fix the code to bind the parameters to the values in an update would
be greatly appreciated
Thank you

Answer 1

Try getting this in your function
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";
// Prepare statement
$stmt = $conn->prepare($sql);
// execute the query
$stmt->execute();
// echo a message to say the UPDATE succeeded
echo $stmt->rowCount() . " records UPDATED successfully";
}
catch(PDOException $e)
{
echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>

Answer 2

Changed Code to a different build:
This eliminated the multiple-value problem
function SQLUpdate($table,$fields,$values,$where,$indxfldnm) {
$dbdata = array();
$i=0;
foreach ($fields as $fld_nm)
{
if ($i > 0) {
$dbdata[$fld_nm] = $values[$i]; }
$i++;
} //end foreach
$buildData = '';
foreach ($dbdata as $key => $val) {
if (empty($val)) {$buildData .= '`'.$key.'` = \'NULL\', ';} else {
$buildData .= '`'.$key.'` = \''.$val.'\', ';}
}
$buildData = substr($buildData,0,-2);
$dbaddr = DB_HOST;
$dbusr = DB_USER;
$dbpwd = DB_PASSWORD;
$dbname = DB_DATABASE;
$prepareUpdate ='';
try {
$db = new PDO('mysql:host='.$dbaddr .';dbname='.$dbname.';charset=UTF8', $dbusr, $dbpwd);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->exec("SET CHARACTER SET utf8");
$sqlqry = 'UPDATE '.$table.' SET '.$buildData.' WHERE `'.$indxfldnm.'` = \''.$where.'\';';
$prepareUpdate = $db->exec($sqlqry);
//execute the update for one or many values
}
catch(PDOException $e)
{
$e->getMessage();
print_r($e);
}
return $sqlqry;
}
//END: SQLUpdate