GreenDao3.2的简单应用

1.在app-->src-->main下也就是与java文件夹同级目录下建立一个java-gen目录

2.在Project的build.gradle中添加模块1代码

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
   // ext.kotlin_version = '1.2.10'
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
      //  classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
       // classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
       // classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.0'//模块1
    }
}

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

3.在APP的build.gradle中添加1-3块代码

    apply plugin: 'org.greenrobot.greendao' //第一块

    android {

        greendao {//第二块
            schemaVersion 1 //数据库版本
            daoPackage 'ljcdada.cn.henchats.gen' //java-gen 下的包名 改成自己的
            targetGenDir 'src/main/java-gen'
        }
    }

dependencies {

    compile 'org.greenrobot:greendao:3.2.0'//第三块

}

4.点击Sync New

5.新建数据库表格的实体类如：

@Entity
public class textTable {
    @Id(autoincrement = true)
    private Long id;
    private String title;
    private String messages;
    private Date date;
}

6.点击Build-->Mack Project

7.查看java-gen目录变化，查看自动生成的文件，这样数据库就初步搭建完成了

8.附上数据库工具类

public class GreenDaoManager {
    private DaoMaster mDaoMaster;
    private DaoSession mDaoSession;

    private GreenDaoManager() {
        init();
    }

    /**
     * 静态内部类，实例化对象使用
     */
    private static class SingleInstanceHolder {
        private static final GreenDaoManager INSTANCE = new GreenDaoManager();
    }

    /**
     * 对外唯一实例的接口
     *
     * @return
     */
    public static GreenDaoManager getInstance() {
        return SingleInstanceHolder.INSTANCE;
    }

    /**
     * 初始化数据
     */
    private void init() {
        DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(MyApplication.getInstance().getApplicationContext(),
                "user");
        mDaoMaster = new DaoMaster(devOpenHelper.getWritableDatabase());
        mDaoSession = mDaoMaster.newSession();
    }

    public DaoMaster getmDaoMaster() {
        return mDaoMaster;
    }

    public DaoSession getmDaoSession() {
        return mDaoSession;
    }

    public DaoSession getNewSession() {
        mDaoSession = mDaoMaster.newSession();
        return mDaoSession;
    }
}

9.增加数据--->new一个实体类添加就可以了

textTable tb = new textTable();
tb.setTitle(title);
tb.setMessages(mes);
//   SimpleDateFormat formatter = new SimpleDateFormat ("yyyy年MM月dd日 HH:mm:ss ");
Date curDate = new Date(System.currentTimeMillis());//获取当前时间
tb.setDate(curDate);
GreenDaoManager.getInstance().getNewSession().insertOrReplace(tb);

10.查询数据--->数组

private List<textTable> list = GreenDaoManager.getInstance().getNewSession().queryBuilder(textTable.class).list();

11.条件查询

private List<textTable> tb= GreenDaoManager.getInstance().getNewSession().queryBuilder(textTable.class).where(textTableDao.Properties.Id.eq(id)).list();

12.修改数据--->传入单条修改过的数据就可以了

GreenDaoManager.getInstance().getNewSession().update(tb.get(0));

13.删除单条记录--->传入单条要删除的数据就可以了

GreenDaoManager.getInstance().getNewSession().delete(list.get(i));

14.清空表

GreenDaoManager.getInstance().getNewSession().deleteAll(textTable .class);

好了，就这么多，哪里有什么不对的地方请多多指教。^_^