Symfony 2 onDelete setNull

Question

请有人告诉我如何在Symfony 2中设置onDelete:SetNull？这是一个例子:

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