2019-01-14数据库配置流程
1.要在project对应项目的build.gradle里面配置依赖包
要在project对应项目的build.gradle 里面配置依赖包
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.0'
classpath 'org.greenrobot:greendao-gradle-plugin:3.2.0'
}
}
第二步
要在新建的module模块对应的build.gradle里面配置依赖包以及生成类的位置
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar']) testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0
compile 'org.greenrobot:greendao:3.2.0'
}第三步 在顶部声明部位 apply plugin: 'org.greenrobot.greendao'第四步 在android{}添加 daoPackage 包名可以修改 greendao{
schemaVersion 1
daoPackage 'com.jiyun.com.day07_greendao'
targetGenDir 'src/main/java'
5.配置好之后，点Sync now 就会自动下载greenDAO对应的jar包
配置好后就可以使用GreenDao进行增删改查 实体类： MyBean 使用注册的形式@Entity(nameInDb = "jia")
public class MyBean {
@Id(autoincrement = true)
private long id;
@Unique
@NotNull
@Property(nameInDb = "name")
private String name;
@Property(nameInDb = "content")
private String content;
@Property(nameInDb = "img")
private int img ;
@Generated(hash = 293826196)
public MyBean(long id, @NotNull String name, String content, int img) {
this.id = id;
this.name = name;
this.content = content;
this.img = img;
}
@Generated(hash = 1281580447)
public MyBean() {
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public int getImg() {
return img;
}
public void setImg(int img) {
this.img = img;
}
}
写完实体类之后重新编译，生成三个类 DaoMesster UserDao DaoSession 然后我们可以使用单例模式创建数据库， DaoManger public class DaoManager { private static DaoManager manager; private DaoMaster.DevOpenHelper helper; public static final String DB_NAME = "student1.db"; private DaoManager(Context context){ helper = new DaoMaster.DevOpenHelper(context,DB_NAME); } public static synchronized DaoManager getInstance(Context context){ if(manager==null) manager = new DaoManager(context); return manager; } public StudentDao getDao(){ DaoMaster master = new DaoMaster(helper.getWritableDatabase()); DaoSession daoSession = master.newSession(); StudentDao studentDao = daoSession.getStudentDao(); return studentDao; }}
