Room Data base config insert update delete

for use room data base in android you need to setup faw things

• first you have to add two deandancy in your gradel file 

implementation "android.arch.persistence.room:runtime:1.0.0-beta2"annotationProcessor "android.arch.persistence.room:compiler:1.0.0-beta2"

then make a entity class and dao class in your file structure 

Data base class 

package com.plzf1.rollearn.database;

import android.arch.persistence.room.Database;

import android.arch.persistence.room.RoomDatabase;

@Database(entities = User.class , version = 1)

public abstract class MyDataBase extends RoomDatabase {

    public abstract UserDao userDao();

}

Entity Class

android.arch.persistence.room.ColumnInfo;

import android.arch.persistence.room.Entity;

import android.arch.persistence.room.PrimaryKey;

@Entity(tableName = "user")

public class User

{

    @PrimaryKey(autoGenerate = true)

    private int userid;

    @ColumnInfo(name = "user_name")

    private  String username;

    @ColumnInfo(name = "user_mobile")

    private String mobile;

    @ColumnInfo(name = "user_balance")

    private int userblance;

    public int getUserid() {

        return userid;

    }

    public void setUserid(int userid) {

        this.userid = userid;

    }

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    public String getMobile() {

        return mobile;

    }

    public void setMobile(String mobile) {

        this.mobile = mobile;

    }

    public int getUserblance() {

        return userblance;

    }

    public void setUserblance(int userblance) {

        this.userblance = userblance;

    }

}

User Dao

package com.plzf1.rollearn.database;
import android.arch.persistence.room.Dao;import android.arch.persistence.room.Insert;import android.arch.persistence.room.Query;import android.arch.persistence.room.Update;
@Daopublic interface UserDao {


    @Insert    void insert(User user);
    @Update    void updateAmout(User user);
    @Query("SELECT * FROM user WHERE userid=:id")
    void loadSingle(String id);}