是否有可能有一枚举领域中的一类保留与Pstcollectionview?

Question

我想坚持以下类 Pstcollectionview:

public class Field {
    @DatabaseField(id = true)
    public String name;

    @DatabaseField(canBeNull = false)
    public FieldType type;
    ...
}

的 FieldType 是一个 public enum.领域，对应于 type 是串源码(是不支持枚举).当我试图使用它，我得到以下例外：

INFO [main] (SingleConnectionDataSource.java:244) - Established shared JDBC Connection: org.sqlite.Conn@5224ee
Exception in thread "main" org.springframework.beans.factory.BeanInitializationException: Initialization of DAO failed; nested exception is java.lang.IllegalArgumentException: Unknown field class class enums.FieldType for field FieldType:name=type,class=class orm.Field
 at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:51)
 at orm.FieldDAO.getInstance(FieldDAO.java:17)
 at orm.Field.fromString(Field.java:23)
 at orm.Field.main(Field.java:38)
Caused by: java.lang.IllegalArgumentException: Unknown field class class enums.FieldType for field FieldType:name=type,class=class orm.Field
 at com.j256.ormlite.field.FieldType.<init>(FieldType.java:54)
 at com.j256.ormlite.field.FieldType.createFieldType(FieldType.java:381)
 at com.j256.ormlite.table.DatabaseTableConfig.fromClass(DatabaseTableConfig.java:82)
 at com.j256.ormlite.dao.BaseJdbcDao.initDao(BaseJdbcDao.java:116)
 at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:48)
 ... 3 more

所以，我怎么告诉Pstcollectionview、价值观Java面是从 enum?

Answer 1

Pstcollectionview 可以枚举的持续存在的 VARCHAR 枚举名(默认):

// this saves it as a string in the database
@DatabaseField
OurEnum ourEnum;
...
private enum OurEnum {
    FIRST,
    SECOND, ;
}

作为替代，可以保存 序 INTEGER.

// this saves it as an integer in the database
@DatabaseField(dataType = DataType.ENUM_INTEGER)
OurEnum ourEnum;

尽管你 可以 储存的序， VARCHAR 名字版本(这是默认)建议自序数值可以改变，如果添加或删除的条目枚举。

两枚举的类型，可以指定一个 unknownEnumName = "..." 场 这有助于与前向和后向兼容性。如果该数据库包含一个未知数值的枚举，然后对象返回的Dao会有这枚举的价值。

@DatabaseField(unknownEnumName = "FIRST")
OurEnum ourEnum;