GreenDao

最新推荐文章于 2024-07-15 21:52:53 发布

三生烟火,一世迷离

最新推荐文章于 2024-07-15 21:52:53 发布

阅读量123

点赞数

CC 4.0 BY-SA版权

文章标签： GreenDao

本文链接：https://blog.youkuaiyun.com/qq_43143422/article/details/85274840

本文介绍了一个使用GreenDao框架进行数据库操作的MainActivity示例，包括插入、删除、更新和查询等基本操作，展示了如何在Android应用中高效地管理数据库。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

MainActivity

package com.zjh.administrat.greendaodemo;

import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import org.greenrobot.greendao.query.QueryBuilder;

import java.util.List;

import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends AppCompatActivity {
    private TextBeanDao mDao;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        dataBase();

    }

    private void dataBase() {
        DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this, "user");
        SQLiteDatabase database = helper.getWritableDatabase();
        DaoMaster daoMaster = new DaoMaster(database);
        DaoSession daoSession = daoMaster.newSession();
        mDao = daoSession.getTextBeanDao();
    }

    @OnClick({R.id.insert, R.id.delete, R.id.update, R.id.query})
    public void onClick(View view){
        switch (view.getId()){
            case R.id.insert:
                for (int i = 0; i < 20; i++) {
                    TextBean textBean = new TextBean();
                    textBean.setId((long) i);
                    textBean.setName("百度醋业委会"+i);
                    mDao.insertOrReplace(textBean);
                }
                break;
            case R.id.delete:
                mDao.deleteByKey((long) 9);
                break;
            case R.id.update:
                TextBean textBean = new TextBean();
                textBean.setId((long) 9);
                textBean.setName("第十一"+100);
                mDao.update(textBean);
                break;
            case R.id.query:
                QueryBuilder builder = mDao.queryBuilder();
                List list = builder.where(TextBeanDao.Properties.Id.eq(9))
                      .orderAsc(TextBeanDao.Properties.Id)
                      .list();
                for (Object o : list){
                    if (o instanceof TextBean){
                        Toast.makeText(this, ((TextBean) o).getName(), Toast.LENGTH_SHORT).show();
                    }
                }
                break;
            default:
                    break;
        }
    }

}

TextBean自定义

@Entity
public class TextBean {
    @Id(autoincrement = true)
    private Long id;
    private String name;
    . . . . . . 自动生成

依赖

//本目录下
apply plugin: 'org.greenrobot.greendao'

greendao {
    schemaVersion 1//数据库版本号
    daoPackage '包名.greendao'//设置DaoMaster、DaoSession、Dao包名
    targetGenDir 'src/main/java'//设置DaoMaster、DaoSession、Dao目录
}

 // add plugin放根目录
classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2'