getting lastInsertId from PDO class - php

Question

I'm using this class to connect to database. It works just fine, except I couldn't get the lastInsertId().
<?php
class connDB
{
public function connDB()
{
require_once( 'dbconfig/config.php' );
$this->confPDO = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_PERSISTENT => false,
PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES UTF8"
);
try
{
$this->dbc = new PDO( "mysql:host=$this->dbHost;dbname=$this->dbName",
$this->dbUser, $this->dbPass, $this->confPDO );
}
catch( PDOException $errMsg )
{
return false;
}
}
public function exec( $sql, array $params = array() )
{
try
{
$this->stmt = $this->dbc->prepare( $sql );
if ( count( $params ) > 0 )
{
foreach ( $params as $k=>$v )
{
$this->bind($k, $v);
}
}
return $this->stmt->execute();
}
catch( PDOException $errMsg )
{
$this->dbc = null;
return false;
}
}
public function bind( $param, $value, $type = null )
{
if ( is_null( $type ) )
{
switch ( true )
{
// Boolen parameter
case is_bool( $value ):
$type = PDO::PARAM_BOOL;
break;
// Integer parameter
case is_int( $value ):
$type = PDO::PARAM_INT;
break;
// Null parameter
case is_null( $value ):
$type = PDO::PARAM_NULL;
break;
// String parameter
default:
$type = PDO::PARAM_STR;
}
}
$this->stmt->bindValue( $param, $value, $type );
}
public function single()
{
return $this->stmt->fetch(PDO::FETCH_ASSOC);
}
public function resultset()
{
return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
}
public function rowCount()
{
return $this->stmt->rowCount();
}
}
Usage: [SELECT]
$sql = "SELECT * FROM < table >";
$db->exec($sql, $params);
$rows = $db->resultset();
foreach ($rows as $row)
{
echo $row['< column >'] . "\n";
}
Usage: [INSERT]
$sql = "INSERT INTO < table > (< column_1 >, < column_2 >, ... ) VALUES
(:valuename_1,
:valuename_2, ...)";
$params = array(':valuename_1' => 'value', ':valuename_2' => 'value', ...);
$db->exec($sql, $params);
I tried to do it this way:
include_once'classe.php';
$db = new connDB();
$sql = "INSERT INTO < table > (< column_1 >, < column_2 >, ... ) VALUES
(:valuename_1,
:valuename_2, ...)";
$params = array(':valuename_1' => 'value', ':valuename_2' => 'value', ...);
$db->exec($sql, $params);
$id = $db->lastInsertId();
I am getting an error:
Fatal error: Call to undefined method connDB::lastInsertId() in
I've tried adding a method into the class:
public function lastinsert()
{
// Return result
return $this->stmt->lastInsertId();
}
Then I called it like this this:
$db = new connDB();
$id = $db->lastinsert();
The error this time was
Fatal error: Call to undefined method PDOStatement::lastInsertId() in

Answer 1

There is no lastInsertId() method in your class.
You need to add it to the connDB class.
you need to call $dbc, not $stmt to get lastInsertId();
$this->dbc->lastInsertId();
as this function belongs to PDO class, not PDO statement class
Also, this piece of code may cause the problem
catch( PDOException $errMsg )
{
$this->dbc = null;
return false;
}
}
Make your exec() function this way
public function exec( $sql, array $params = array() )
{
$this->stmt = $this->dbc->prepare( $sql );
foreach ( $params as $k=>$v )
{
$this->bind($k, $v);
}
return $this->stmt->execute();
}

Answer 2

Using the same database class and was able to use lastInsertId like this:
$db = new connDB();
...
$_SESSION['users_id'] = $db->dbc->lastInsertId('id');

Answer 3

If you are using the model's save function:
$row->save();
You can use:
return $row->save();
which returns the id