可空约束对mysql表中的列没有任何影响

Question

我创建了以下域类

class User implements Serializable {

private static final long serialVersionUID = 1

String username
String password
String mobile
String email
boolean enabled = true
boolean accountExpired
boolean accountLocked
boolean passwordExpired

static belongsTo = [organization  : Organization,
                    branch        : Branch,
                    student       : Student]

Set<Role> getAuthorities() {
    (UserRole.findAllByUser(this) as List<UserRole>)*.role as Set<Role>
}

static constraints = {
    password blank: false, password: true
    username blank: false, unique: true
    organization nullable: true
    branch nullable: true
    student nullable: true
    email nullable: true
    mobile nullable: true
} }

但是当我在mysql中检查User表时，它仍显示分支，组织和学生NOT NULL

我在相关域中维护了hasOne关联。例如

class Organization { ... static hasOne = [user: User] }

我怀疑，是否有一个对此有任何影响

Answer 1

hasOne创建非空约束。您必须在相关域中使用hasMany关系才能使用null。