Java 房间数据库实体初始化
我们有以下Json和模型类。如何在此Json上启动Room实体数据库Java 房间数据库实体初始化,java,android,mvvm,android-sqlite,android-room,Java,Android,Mvvm,Android Sqlite,Android Room,我们有以下Json和模型类。如何在此Json上启动Room实体数据库 { "ResultResponse": "Success", "OTPValue": "3239", "EmployeeInfo": [ { "EmployeeCode": "EMP001", "Name": "Natheem", "ContactNo": "9952265503", "
{
"ResultResponse": "Success",
"OTPValue": "3239",
"EmployeeInfo": [
{
"EmployeeCode": "EMP001",
"Name": "Natheem",
"ContactNo": "9952265503",
"AlternativeContactNo": "9952265502",
"Age": "22",
"DOB": "1995-10-08T00:00:00",
"ImagePath": "C:\\FaceTag\\FaceTag\\Images\\EMP001\\natheem.jpg",
"Latitude": "1.104492000000000e+001",
"Longitude": "7.701183000000000e+001",
"Address1": "45, Bharathiyar Nagar",
"Address2": "Coimbatore",
"City": "Coimbatore",
"State": "Tamilnadu",
"Country": "India",
"Zip": "641001",
"IsSupervisor": false,
"FormId": 0
}
],
"AdditionalField": null,
"FieldControl": null
}
我的实体类是
@Entity(tableName = "tbl_device_register")
public class DeviceRegister {
@PrimaryKey(autoGenerate = true)
private int id;
@SerializedName("ResultResponse")
@Expose
private String resultResponse;
@SerializedName("OTPValue")
@Expose
private String oTPValue;
@SerializedName("EmployeeInfo")
@Expose
private List<EmployeeInfo> employeeInfo = null;
@SerializedName("AdditionalField")
@Expose
private Object additionalField;
@SerializedName("FieldControl")
@Expose
private Object fieldControl;
@实体(tableName=“tbl\U设备\U寄存器”)
公共类设备注册器{
@PrimaryKey(自动生成=真)
私有int-id;
@SerializedName(“ResultResponse”)
@暴露
私有字符串resultResponse;
@SerializedName(“OTPValue”)
@暴露
私有字符串oTPValue;
@SerializedName(“EmployeeInfo”)
@暴露
私有列表employeeInfo=null;
@SerializedName(“附加字段”)
@暴露
私有对象附加字段;
@SerializedName(“FieldControl”)
@暴露
私有对象控制;
如何分配外键,以及如何处理表关系。大多数教程都是关于基础知识的。谢谢
添加ForeignKey意味着我们在该实体和
在这个参数中,我们声明parentColumns,它是
User类和childColumns中id列的名称,它是
Repo类中用户id列的名称
外键结构为
@Entity(foreignKeys =
[
ForeignKey(
entity = SOURCECLASSNAME::class,
parentColumns = arrayOf("id"),
childColumns = arrayOf("id"),
onDelete = ForeignKey.CASCADE
)
], indices = [Index(value = "id")]
)
确保在下面导入
import static android.arch.persistence.room.ForeignKey.CASCADE;
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