将POJO添加到Room数据库表中

问题描述

我有一个POJO类OfflineDataRequestInfo，我想将其插入数据库表作为OfflineData的一部分，而error: Cannot figure out how to save this field into database. You can consider adding a type converter for it. private final com.i6systems.offlineservicelibrary.offlineDatabase.OfflineDataRequestInfo requestInfojsonx = null;是我的实体。但是我得到一个错误

我该如何解决这个问题

data class OfflineDataRequestInfo ( val status: String,val userId: String,val fuelOrderId: String,val timeStamp: String,val fuelOrder: String ) @Entity data class OfflineData ( @PrimaryKey(autoGenerate = true) val uid: Int = 0,@ColumnInfo(name = "request_info_json") val requestInfoJson: String?,@ColumnInfo(name="request_code") val requestCode: String?,@ColumnInfo(name="request_info_jsonx") val requestInfojsonx: OfflineDataRequestInfo )

这是我的代码

suspend fun insertOfflineData(requestInfoJson: String,requestCode: String,offlineDataRequestInfo: OfflineDataRequestInfo): Long {
        var result: Long = 0
        result = OfflineDatabaseManager.getInstance(app.applicationContext).insertOfflineData(
            OfflineData(
                0,requestInfoJson,requestCode,offlineDataRequestInfo
            ))
        return result
    }

offlineHelper.insertOfflineData(
                    inPositionApiData.toString(),"notifyInPosition",OfflineDataRequestInfo(
                    "in-position",action.userId,id,action.timestamp.toString(),fuelOrderData.toString()
                ))

这不是我要插入的

$users = DB::table('users')
                ->whereIn('id',[1,2,3])
                ->get();

解决方法

我看到您有两种解决方法：

1. 为对象TypeConverter写一个OfflineDataRequestInfo
2. 添加注释@Embedded

@Embedded
@ColumnInfo(name="request_info_jsonX") 
val requestInfoJsonX: OfflineDataRequestInfo