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Lançar exception ao inserir campo null PDO



CREATE TABLE `usuario` (
  `cod_usuario` int(9) NOT NULL AUTO_INCREMENT,
  `nom_usuario` varchar(200) NOT NULL,
  PRIMARY KEY (`cod_usuario`)
$nom_usuario = null;
    $sql = "INSERT INTO usuario (nom_usuario) values(?)";
    $stmt = $PDO->prepare($sql);
}catch(exception $e) {
    echo $e->getMessage();
$PDO = null;

Com minha coluna definida como not null, tem como o PDO validar minha variável e lançar exceção caso esteja como null?

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