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我在运行此查询的 PostgreSQL 数据库中有三个表：

ALTER TABLE waccount ALTER COLUMN balance SET DEFAULT 0;
ALTER TABLE waccount ALTER COLUMN created SET DEFAULT now();
ALTER TABLE waccount ALTER COLUMN modified SET DEFAULT now();

现在，当我尝试INSERT使用以下代码从 Symfony2 控制器运行时：

$entity = new Account();
$form = $this->createForm(new AccountType(), $entity);
$form->handleRequest($request);

if ($form->isValid()) {
  $em = $this->getDoctrine()->getManager();
  $em->persist($entity);
  $em->flush();

  return $this->redirect($this->generateUrl('wba_show', array('id' => $entity->getAccountId())));
}

我明白了：

使用参数 [1, "01234567890121345678" 执行 'INSERT INTO waccount (account_id, account_number, bank_name, balance, created, modified, account_type) VALUES (?, ?, ?, ?, ?, ?, ?)' 时发生异常， “美国银行”，空，空，空，6]：

SQLSTATE [23502]：非空违规：7 错误：“余额”列中的空值违反非空约束详细信息：失败行包含 (1, 01234567890121345678, BankOfAmerica, 6, null, null, null)。

为什么 Symfony 或 Doctrine 不处理默认值？我做错了什么或者我错过了什么？

账户实体

这是我的帐户实体：

namespace BankBundle\Entity;
use Doctrine\ORM\Mapping as ORM;

/**
 * Account
 *
 * @ORM\Entity
 * @ORM\Table(name="waccount")
 */
class Account {

    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     * 
     */
    protected $account_id;

    /**
     *
     * @ORM\Column(type="string", length=20)
     */
    protected $account_number;

    /**
     *
     * @ORM\Column(type="string", length=150)
     */
    protected $bank_name;

    /**
     * @ORM\OneToOne(targetEntity="BankBundle\Entity\AccountType")
     * @ORM\JoinColumn(name="account_type", referencedColumnName="type_id")
     */
    protected $account_type;

    /**
     *
     * @ORM\Column(type="float")
     */
    protected $balance;

    /**
     * @var \DateTime
     * @ORM\Column(type="datetime")
     */
    protected $created;

    /**
     * @var \DateTime
     * @ORM\Column(type="datetime")
     */
    protected $modified;

    public function getAccountId() {
        return $this->account_id;
    }

    public function setAccountNumber($account_number) {
        $this->account_number = $account_number;
    }

    public function getAccountNumber() {
        return $this->account_number;
    }

    public function setAccountType($account_type) {
        $this->account_type = $account_type;
    }

    public function setBankName($bank_name) {
        $this->bank_name = $bank_name;
    }

    public function getBankName() {
        return $this->bank_name;
    }

    public function getAccountType() {
        return $this->account_type;
    }

    public function setBalance($balance) {
        $this->balance = (float) $balance;
    }

    public function getBalance() {
        return $this->balance;
    }

    public function setCreated($created) {
        $this->created = $created;
    }

    public function getCreated() {
        return $this->created;
    }

    public function setModified($modified) {
        $this->modified = $modified;
    }

    public function getModified() {
        return $this->modified;
    }

}

该表waccount存在于数据库中

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