如何在房间数据库中启动两个查询

Question

我想知道如何在Room数据库Dao中触发两个查询。

@Dao
public interface AttendanceDao {

    @Query("Select * from Mattendance where Date = :date AND studentId = :id")
    Mattendance getAttendanceByDate(Date date, int id);

@Entity
public class Mattendance {

    @PrimaryKey(autoGenerate = true)
    int id;

    int studentId;
    int batchId;
    String studentName;
    String batchName;
    String status;
    Date date;

    public Mattendance(int studentId, int batchId, String studentName, String batchName, String status, Date date) {
        this.studentId = studentId;
        this.batchId = batchId;
        this.studentName = studentName;
        this.batchName = batchName;
        this.status = status;
        this.date = date;
    }

all Getters And setters 
didn't added because stackoverflow showing error of to much of code and lesser information
}

我还在这里添加了出勤实体类，供您参考

我不知道如何触发两个查询。

Answer 1

这应该对您有帮助。

@Transaction允许您创建一个函数并在一个调用中调用多个查询。

https://developer.android.com/reference/android/arch/persistence/room/Transaction