1、在project的Gradle中配置:
buildscript {
repositories {
jcenter()
mavenCentral() // add repository
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.0'
classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2' // add plugin
}
}
2、在app的Gradle中配置:
apply plugin: 'com.android.application'
apply plugin: 'org.greenrobot.greendao' // apply plugin
dependencies {
compile 'org.greenrobot:greendao:3.2.2' // add library
}
3、在app的Gradle中配置数据库版本等信息:
greendao {
schemaVersion 1
daoPackage 'com.tao.greendao.gen'
targetGenDir 'src/main/java'
}
schemaVersion :当前的版本号;
daoPackage :由GreenDao自动生成的代码(DaoMaster,DaoSession,XXDao)所在的包名,默认的是在项目包下面新建一个gen;
targetGenDir :自动生成代码的目录。
4、自定义实体类:
@Entity
public class Student {
@Id(autoincrement = true)
private Long id;
private String sNum;
private String name;
private String age;
private String sex;
}
@Entity 标识实体类,greenDAO会映射成sqlite的一个表,表名为实体类名的大写形式
@Id 标识主键,该字段的类型为long或Long类型,autoincrement设置是否自动增长
@Property 标识该属性在表中对应的列名称,默认是实体类属性名称的大写, nameInDb设置名称
@Transient 标识该属性将不会映射到表中,也就是没有这列
@NotNull 设置表中当前列的值不可为空
@Convert 指定自定义类型(@linkPropertyConverter)
@Generated greenDAO运行所产生的构造函数或者方法,被此标注的代码可以变更或者下次运行时清除
@Index 使用@Index作为一个属性来创建一个索引;定义多列索引(@link Entity#indexes())
@JoinEntity 定义表连接关系
@JoinProperty 定义名称和引用名称属性关系
@Keep 注解的代码段在GreenDao下次运行时保持不变
1.注解实体类:默认禁止修改此类
2.注解其他代码段,默认禁止修改注解的代码段
@OrderBy 指定排序
@ToMany 定义与多个实体对象的关系
@ToOne 定义与另一个实体(一个实体对象)的关系
@Unique 向数据库列添加了一个唯一的约束
5、创建好实体类后Build->Make Project对项目进行重新构建,会在daoPackage 下自动生成代码:
@Entity
public class Student {
@Id(autoincrement = true)
private Long id;
private String sNum;
private String name;
private String age;
private String sex;
@Generated(hash = 672840549)
public Student(Long id, String sNum, String name, String age, String sex) {
this.id = id;
this.sNum = sNum;
this.name = name;
this.age = age;
this.sex = sex;
}
@Generated(hash = 1556870573)
public Student() {
}
public Long getId() {
return this.id;
}
public void setId(Long id) {
this.id = id;
}
public String getSNum() {
return this.sNum;
}
public void setSNum(String sNum) {
this.sNum = sNum;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return this.age;
}
public void setAge(String age) {
this.age = age;
}
public String getSex() {
return this.sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}
6、新建一个操作GreenDao的工具类:
/**
* 作者:WangJintao
* 时间:2017/4/6
* 邮箱:wangjintao1988@163.com
*/
public class GreenDaoManager {
private static DaoMaster mDaoMaster;
private static DaoSession mDaoSession;
private static volatile GreenDaoManager mInstance = null;
private static final String DB_NAME = "GreenDao.db";
private GreenDaoManager() {
}
public static void init(Context context) {
DaoMaster.DevOpenHelper devOpenHelper = new
DaoMaster.DevOpenHelper(context, DB_NAME);
mDaoMaster = new DaoMaster(devOpenHelper.getWritableDatabase());
mDaoSession = mDaoMaster.newSession();
}
public static GreenDaoManager getInstance() {
if (mInstance == null) {
synchronized (GreenDaoManager.class) {
if (mInstance == null) {
mInstance = new GreenDaoManager();
}
}
}
return mInstance;
}
public DaoSession getSession() {
return mDaoSession;
}
}
在Application中初始化就可以使用了。
初始化代码:GreenDaoManager.init(this);
7、增删查改操作:
a)增:
Student student = new Student();
student.setSNum(id);
student.setName(name);
student.setAge(age);
student.setSex(sex);
GreenDaoManager.getInstance().getSession().getStudentDao().insert(student);
b)删:
Student student2 = new Student();
student2.setId(_id);//数据在表中自动生成的id
student2.setSNum(id);
student2.setName(name);
student2.setAge(age);
student2.setSex(sex);
GreenDaoManager.getInstance().getSession().getStudentDao().delete(student2);
c)查:
GreenDaoManager.getInstance().getSession().getStudentDao().load(id);
d)改:
Student student3 = new Student();
student3.setId(_id);//数据在表中自动生成的id
student3.setSNum(id);
student3.setName(name);
student3.setAge(age);
student3.setSex(sex);
GreenDaoManager.getInstance().getSession().getStudentDao().update(id);