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官方文档参考

val db = Room.databaseBuilder(            this,            DaoFactory::class.java, "application_db_11"        ).allowMainThreadQueries()            .build()        val dao = db.StudentDao()//        dao.insertStudent(Student(1, "hello world", "aaa"))        Log.i("studentInfo ", dao.getAll().toString())

实体类:

package com.lyr.myapplication.db.entityimport androidx.room.ColumnInfoimport androidx.room.Entityimport androidx.room.PrimaryKey/** * @Author  lyr * @create 2020/10/15 14:15 */@Entity(tableName = "t_student")data class Student(    @PrimaryKey    val id: Int,    @ColumnInfo    val studentName: String,    @ColumnInfo    val content: String)

定义：

package com.lyr.myapplication.db.daoimport androidx.room.Daoimport androidx.room.Insertimport androidx.room.Queryimport com.lyr.myapplication.db.entity.Student/** * @Author  lyr * @create 2020/10/15 14:26 */@Daointerface StudentDao{
       @Query("select * from t_student")    fun  getAll():List
   
        @Insert    fun  insertStudent(vararg  students:Student)}
   

抽象工厂：

package com.lyr.myapplication.dbimport androidx.room.Databaseimport androidx.room.RoomDatabaseimport com.lyr.myapplication.db.dao.StudentDaoimport com.lyr.myapplication.db.entity.Student/** * @Author  lyr * @create 2020/10/15 14:28 */@Database(entities = arrayOf(Student::class),version = 1)abstract class DaoFactory: RoomDatabase (){
       abstract fun StudentDao():StudentDao}

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