如何使学说支持时间戳列？

Question

我正在尝试应用以下迁移：

Schema::table('users', function (Blueprint $table) {
    $table->timestamp('created_at')->useCurrent()->change();
});

但是artisan说：

  [Doctrine\DBAL\DBALException]
  Unknown column type "timestamp" requested. Any Doctrine type that you use has to be registered with \Doctrine\DBAL
  \Types\Type::addType(). You can get a list of all the known types with \Doctrine\DBAL\Types\Type::getTypesMap(). I
  f this error occurs during database introspection then you might have forgot to register all database types for a
  Doctrine Type. Use AbstractPlatform#registerDoctrineTypeMapping() or have your custom types implement Type#getMapp
  edDatabaseTypes(). If the type name is empty you might have a problem with the cache or forgot some mapping inform
  ation.

当我尝试安装mmerian/doctrine-timestamp（composer install mmerian/doctrine-timestamp）时，composer说：

  [InvalidArgumentException]
  Could not find package mmerian/doctrine-timestamp at any version for your minimum-stability (stable). Check the pa
  ckage spelling or your minimum-stability

我该怎么办？

使用composer require mmerian/doctrine-timestamp=dev-master，我能够安装UPD，然后可以安装软件包，然后Type::addType('timestamp', 'DoctrineTimestamp\DBAL\Types\Timestamp');在before Schema::table语句中添加，但是现在出现了另一个错误：

  [Illuminate\Database\QueryException]
  SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value for 'created_at' (SQL: ALTER TABLE u
  sers CHANGE created_at created_at INT DEFAULT 'CURRENT_TIMESTAMP' NOT NULL)

UPD我再次检查它是否适用于mmerian/doctrine-timestamp，因为那时我仅添加了文档中的第一行（或文档已更新）：

Type::addType('timestamp', 'DoctrineTimestamp\DBAL\Types\Timestamp');                                          
DB::getDoctrineConnection()->getDatabasePlatform()->registerDoctrineTypeMapping('Timestamp', 'timestamp');

但这也没有帮助。迁移成功，但列定义未更改。

Answer 1

在当前的 Laravel 版本中，您只需将以下内容添加到您的迁移中即可config/database.php更改timestamp列。

use Illuminate\Database\DBAL\TimestampType;
 
'dbal' => [
    'types' => [
        'timestamp' => TimestampType::class,
    ],
],

来源

Answer 2

如您所见，mmerian/doctrine-timestamp并不能解决问题。首先，经过这条线 $table->getColumns()['created_at']是

class Doctrine\DBAL\Schema\Column#520 (16) {
  protected $_type => class Doctrine\DBAL\Types\DateTimeType#504 (0) { }
  protected $_length => NULL
  protected $_precision => int(10)
  protected $_scale => int(0)
  protected $_unsigned => bool(false)
  protected $_fixed => bool(false)
  protected $_notnull => bool(true)
  protected $_default => string(17) "CURRENT_TIMESTAMP"
  protected $_autoincrement => bool(false)
  protected $_platformOptions => array(0) { }
  protected $_columnDefinition => NULL
  protected $_comment => NULL
  protected $_customSchemaOptions => array(0) { }
  protected $_name => string(10) "created_at"
  protected $_namespace => NULL
  protected $_quoted => bool(false)
}

并且$this->getTableWithColumnChanges($blueprint, $table)->getColumns()['created_at']是

class Doctrine\DBAL\Schema\Column#533 (16) {
  protected $_type => class DoctrineTimestamp\DBAL\Types\Timestamp#513 (0) { }
  protected $_length => NULL
  protected $_precision => int(10)
  protected $_scale => int(0)
  protected $_unsigned => bool(false)
  protected $_fixed => bool(false)
  protected $_notnull => bool(true)
  protected $_default => string(17) "CURRENT_TIMESTAMP"
  protected $_autoincrement => bool(false)
  protected $_platformOptions => array(0) { }
  protected $_columnDefinition => NULL
  protected $_comment => NULL
  protected $_customSchemaOptions => array(0) { }
  protected $_name => string(10) "created_at"
  protected $_namespace => NULL
  protected $_quoted => bool(false)
}

所以，首先我ON UPDATE在这里看不到有关零件的信息。其次，唯一的区别是$_type价值。我能确认后，这条线，$tableDiff->changedColumns['created_at']->changedProperties是

array(1) {
  [0] => string(4) "type"
}

然后，在生成 ALTER TABLE statement 时，这一切都归结为

public function getDefaultValueDeclarationSQL($field)
{
    $default = empty($field['notnull']) ? ' DEFAULT NULL' : '';
    if (isset($field['default'])) {
        $default = " DEFAULT '".$field['default']."'";
        if (isset($field['type'])) {
            if (in_array((string) $field['type'], array("Integer", "BigInt", "SmallInt"))) {
                $default = " DEFAULT ".$field['default'];
            } elseif (in_array((string) $field['type'], array('DateTime', 'DateTimeTz')) && $field['default'] == $this->getCurrentTimestampSQL()) {
                $default = " DEFAULT ".$this->getCurrentTimestampSQL();
            } elseif ((string) $field['type'] == 'Time' && $field['default'] == $this->getCurrentTimeSQL()) {
                $default = " DEFAULT ".$this->getCurrentTimeSQL();
            } elseif ((string) $field['type'] == 'Date' && $field['default'] == $this->getCurrentDateSQL()) {
                $default = " DEFAULT ".$this->getCurrentDateSQL();
            } elseif ((string) $field['type'] == 'Boolean') {
                $default = " DEFAULT '" . $this->convertBooleans($field['default']) . "'";
            }
        }
    }
    return $default;
}

在这条线附近的某个地方应该检查Timestamptype 是否'CURRENT_TIMESTAMP'变为CURRENT_TIMESTAMP. 这可能mmerian/doctrine-timestamp吗？这个问题暂时悬而未决。此检查很可能会解决我的特定问题。但现在我要摆脱这个：

DB::statement('ALTER TABLE users MODIFY COLUMN created_at
    TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP');

Answer 3

您好，您可以使用“ datetime”类型：

 Schema::table('orders', function ($table) {

        $table->datetime('pay_time')->nullable()->change();

    });