GreenDao的介绍
greenDao是一个将对象映射到SQLite数据库中的轻量且快速的ORM解决方案，为android移动开发而产生的一个库。关于greenDAO的概念可以看官网greenDAO，Github。
GreenDao优势
- Maximum performance (probably the fastest ORM for Android); our benchmarks are open sourced too
- Easy to use powerful APIs covering relations and joins
- Small library size (<100KB) to keep your build times low and to avoid the 65k method limit
- Database encryption: greenDAO supports SQLCipher to keep your user’s data safe
- Strong community: More than 5.000 GitHub stars show there is a strong and active community
GreenDao环境配置
1.首先在Android studio 项目的project的build.grad 文件中添加
// In your root build.gradle file:
buildscript {
repositories {
jcenter()
mavenCentral() <-- add repository
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.0'
classpath 'org.greenrobot:greendao-gradle-plugin:3.2.1' <-- add plugin
}
}
2.在module的build.gradle文件中添加greenDAO的插件，并引入相关类库
// In your app projects build.gradle file:
apply plugin: 'com.android.application'
apply plugin: 'org.greenrobot.greendao' <-- apply plugin
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
greendao {
schemaVersion 1//版本信息
/**
* 输出dao的数据库操作实体类文件夹（相对路径 包名+自定义路径名称，包将创建于包名的直接路径下）
*/
daoPackage 'com.yushu.greendao.model.greendao'
/**
* greenDao实体类包文件夹
*/
targetGenDir 'src/main/java'
}
}
dependencies {
compile 'org.greenrobot:greendao:3.2.0' <-- add library
}
3 .在项目包下创建实体类
@Entity
public class User {
@Id
private Long id;//@Id必须为Long
@Unique
private long identity;//身份唯一
@Property(nameInDb = "NAME")
private String name;//改变列名
@NotNull
private int age;//不能为空
@Transient
private String hobby;//不存储到数据库
}
4.编译项目MakeProject
编译项目后，User实体类会自动编译，生成get、set方法并且会在 daoPackage 'com.yushu.greendao.model.greendao'目录下生成三个文件；
QQ截图20170318162643.png
GreenDao的使用
//创建dbmanager类初始化数据库
DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(getApplicationContext(), "user.db", null);
DaoMaster daoMaster = new DaoMaster(devOpenHelper.getWritableDb());
DaoSession daoSession = daoMaster.newSession();
// 获取userDao
userDao = daoSession.getUserDao();
增删改查：
1. 增
User mUser = new User((long) 2, "123412412412", "yuShu", 18);
userDao.insert(mUser);
2. 删
userDao.deleteByKey((long) 2);
// userDao.delete(mUser);
3. 改
User mUser = new User((long) 2, "123412412412", "yuShu", 25);
userDao.update(mUser);
4. 查
userDao.loadAll()//查询所有
QueryBuilder<User> qb = userDao.queryBuilder();
qb.where(UserDao.Properties.Age.eq(18)).orderAsc(UserDao.Properties.Age);
List<User> list = qb.list();
代码混淆
-keep class org.greenrobot.greendao.**{*;}
-keepclassmembers class * extends org.greenrobot.greendao.AbstractDao {
public static java.lang.String TABLENAME;
}
-keep class **$Properties