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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);}


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