symfony - Symfony 2 onDelete setNull

Question

请问有人可以告诉我如何在 Symfony 2 中设置 onDelete: SetNull 吗？这是示例：

oneToOne:
    Company:
        targetEntity: Company
        inversedBy: id
        joinColumn:
            name: id
            referencedColumnName: contact_person
            onDelete:  ??

谢谢。

Answer 1

只需引用字符串并设置onDelete为SET NULL这样：

joinColumn:
    onDelete:  "SET NULL" 

更多选项： http: //www.doctrine-project.org/jira/browse/DDC-409