如何在复合键方案中构造迁移SQLMap

Question

如果表有复合主键，我们如何实例化MigrateSQLMap？

Answer 1

当MigrateSQLMap采用数组时，您可以在源定义中设置多个字段：

// The source ID here is the one retrieved from each data item in the XML file, and
// used to identify specific items
$this->map = new MigrateSQLMap($this->machineName,
  array(
    'vendor_code' => array(
      'type' => 'varchar',
      'length' => 250,
      'not null' => TRUE,
    ),
    'client_code' => array(
      'type' => 'varchar',
      'length' => 250,
      'not null' => TRUE,
    ),
  ),
  MigrateDestinationEntityAPI::getKeySchema('vendor')
);

在上面的代码中，* vendor_code *和* client_code *是复合键的组成部分。