可空约束没有在MySQL表的列中的任何影响

Question

我有创建以下域类

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，当我检查MySQL的用户表，它显示仍不分支，组织和学生NULL

我在相关域中维护了一个关联。例如

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

我怀疑，是否有hasOne对

Answer 1

hasOne任何影响创建一个NOT NULL约束。您必须在相关的域中使用hasMany关系，以使其不工作。