Question

我是SQLite和ActiveAndroid的新手。

我正在努力推出应用更新并需要迁移我的数据库。某些表已添加或删除了列等。在ActiveAndroid中，通过编写迁移脚本来执行模式迁移。在处理基本数据类型时，我很容易理解如何执行此操作，但我很困惑如何添加映射到其他对象/类的列。

例如，下面是现有的模型：

@Table(name = "GatewayDevices", id = BaseColumns._ID)
public class GatewayDevice extends Model {

    private static final String TAG = GatewayDevice.class.getSimpleName();


    @Column(name = "identifier", unique = true, onUniqueConflict = Column.ConflictAction.REPLACE, notNull = true)
    private String identifier;

    @Column(name = "deviceType", notNull = true)
    private String deviceType;

    @Column(name = "name")
    private String name; 

    public GatewayDevice() {
        super();
    }

    ...

}

我正在更新它：

@Table(name = "GatewayDevices", id = BaseColumns._ID)
public class GatewayDevice extends Model {

    private static final String TAG = GatewayDevice.class.getSimpleName();


    @Column(name = "identifier", unique = true, onUniqueConflict = Column.ConflictAction.REPLACE, notNull = true)
    private String identifier;

    @Column(name = "deviceType", notNull = true)
    private String deviceType;

    @Column(name = "name")
    private String name;

    @Column(name = "controller", onUpdate = Column.ForeignKeyAction.CASCADE, onDelete = Column.ForeignKeyAction.CASCADE)
    private Controller controller;


    public GatewayDevice() {
        super();
    }

    ...

}

如何使用基本ALTER TABLE GatewayDevice ADD COLUMN controller <type>结构添加此列？

Answer 1

您可以为Controller类编写自己的序列化程序，并进行迁移

ALTER TABLE GatewayDevice ADD COLUMN控制器TEXT

（字符串类型）

ActiveAndroid模式迁移添加作为对象的列

1 个答案: