greenDao的使用与封装

1. greenDao的使用步骤：

第一步：在项目的.gradle文件里面添加

buildscript {repositories {mavenCentral()jcenter()}dependencies {classpath 'com.android.tools.build:gradle:2.3.0'classpath 'org.greenrobot:greendao-gradle-plugin:3.0.0'// NOTE: Do not place your application dependencies here; they belong// in the individual module build.gradle files}}

第二步：在moddle的.gradle文件里面添加


apply plugin: 'org.greenrobot.greendao'
android {compileSdkVersion 26defaultConfig {applicationId "com.example.administrator.myapplication"minSdkVersion 15targetSdkVersion 26versionCode 1versionName "1.0"testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'}}
//    greendao{
//        schemaVersion 2
//        schemaVersion 2 //数据库版本号
//        daoPackage 'com.dianchou.dcw.recorddb'// 设置DaoMaster、DaoSession、Dao 包名
//        targetGenDir 'src/main/java'//设置DaoMaster、DaoSession、Dao目录
//    }greendao {schemaVersion 1daoPackage 'com.example.administrator.myapplication.recorddb'targetGenDir 'src/main/java'}
}

依赖里面添加：

dependencies {implementation fileTree(dir: 'libs', include: ['*.jar'])implementation 'com.jakewharton:butterknife:8.8.1'annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'implementation 'com.android.support.constraint:constraint-layout:1.0.2'testImplementation 'junit:junit:4.12'androidTestImplementation 'com.android.support.test:runner:0.5'androidTestImplementation 'com.android.support.test.espresso:espresso-core:2.2.2'implementation 'com.android.support:appcompat-v7:26.1.0'//数据库compile 'org.greenrobot:greendao:3.0.1'compile 'org.greenrobot:greendao-generator:3.0.0'
}

第三步：添加Bean类，用User举例子，一定要记得注解@Entity

@Entity
public class User {@Id(autoincrement = true)//设置自增长private Long id;@Index(unique = true)//设置唯一性private String perNo;//人员编号private String name;//人员姓名private String sex;//人员姓名
}

第四步：编译项目，User实体类会自动编译，生成get、set方法并且会在com.example.john.greendaodemo.gen目录下生成三个文件；在我们Make Project后，实体内的变化如下所示：

@Entity
public class PersonInfor {@Id(autoincrement = true)//设置自增长private Long id;@Index(unique = true)//设置唯一性private String perNo;//人员编号private String name;//人员姓名private String sex;//人员姓名@Generated(hash = 1311768890)public PersonInfor(Long id, String perNo, String name, String sex) {this.id = id;this.perNo = perNo;this.name = name;this.sex = sex;}@Generated(hash = 1362534400)public PersonInfor() {}public Long getId() {return this.id;}public void setId(Long id) {this.id = id;}public String getPerNo() {return this.perNo;}public void setPerNo(String perNo) {this.perNo = perNo;}public String getName() {return this.name;}public void setName(String name) {this.name = name;}public String getSex() {return this.sex;}public void setSex(String sex) {this.sex = sex;}
}

2.封装数据库操作类

一 .因为我们对数据库的操作无非就是增删改查四个操作，所以我们将他们简单封装一下。

public class DbController {/*** Helper*/private DaoMaster.DevOpenHelper mHelper;//获取Helper对象/*** 数据库*/private SQLiteDatabase db;/*** DaoMaster*/private DaoMaster mDaoMaster;/*** DaoSession*/private DaoSession mDaoSession;/*** 上下文*/private Context context;/*** dao*/private PersonInforDao personInforDao;private static DbController mDbController;/*** 获取单例*/public static DbController getInstance(Context context){if(mDbController == null){synchronized (DbController.class){if(mDbController == null){mDbController = new DbController(context);}}}return mDbController;}/*** 初始化* @param context*/public DbController(Context context) {this.context = context;mHelper = new DaoMaster.DevOpenHelper(context,"person.db", null);mDaoMaster =new DaoMaster(getWritableDatabase());mDaoSession = mDaoMaster.newSession();personInforDao = mDaoSession.getPersonInforDao();}/*** 获取可读数据库*/private SQLiteDatabase getReadableDatabase(){if(mHelper == null){mHelper = new DaoMaster.DevOpenHelper(context,"person.db",null);}SQLiteDatabase db =mHelper.getReadableDatabase();return db;}/*** 获取可写数据库* @return*/private SQLiteDatabase getWritableDatabase(){if(mHelper == null){mHelper =new DaoMaster.DevOpenHelper(context,"person.db",null);}SQLiteDatabase db = mHelper.getWritableDatabase();return db;}/*** 会自动判定是插入还是替换* @param personInfor*/public void insertOrReplace(PersonInfor personInfor){personInforDao.insertOrReplace(personInfor);}/**插入一条记录，表里面要没有与之相同的记录** @param personInfor*/public long insert(PersonInfor personInfor){return  personInforDao.insert(personInfor);}/*** 更新数据* @param personInfor*/public void update(PersonInfor personInfor){PersonInfor mOldPersonInfor = personInforDao.queryBuilder().where(PersonInforDao.Properties.Id.eq(personInfor.getId())).build().unique();//拿到之前的记录if(mOldPersonInfor !=null){mOldPersonInfor.setName("张三");personInforDao.update(mOldPersonInfor);}}/*** 按条件查询数据*/public List<PersonInfor> searchByWhere(String wherecluse){List<PersonInfor>personInfors = (List<PersonInfor>) personInforDao.queryBuilder().where(PersonInforDao.Properties.Name.eq(wherecluse)).build().unique();return personInfors;}/*** 查询所有数据*/public List<PersonInfor> searchAll(){List<PersonInfor>personInfors=personInforDao.queryBuilder().list();return personInfors;}/*** 删除数据*/public void delete(String wherecluse){personInforDao.queryBuilder().where(PersonInforDao.Properties.Name.eq(wherecluse)).buildDelete().executeDeleteWithoutDetachingEntities();}

二. 看看我们的MainActivity

public class MainActivity extends AppCompatActivity {private Button Add,Delete,Update,Search;private DbController mDbController;private PersonInfor personInfor1,personInfor2,personInfor3,personInfor4;private long insertTipId;private TextView dataArea;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mDbController = DbController.getInstance(MainActivity.this);initView();Envent();similateData();}private void similateData() {personInfor1 = new PersonInfor(null,"001","王大宝","男");personInfor2 = new PersonInfor(null,"002","李晓丽","女");personInfor3 = new PersonInfor(null,"003","王麻麻","男");personInfor4 = new PersonInfor(null,"004","王大锤","女");}private void Envent() {Add.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//AddmDbController.insertOrReplace(personInfor1);mDbController.insertOrReplace(personInfor2);mDbController.insertOrReplace(personInfor3);mDbController.insertOrReplace(personInfor4);showDataList();}});Delete.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//DeletemDbController.delete("王麻麻");showDataList();}});Update.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//UpdatemDbController.update(personInfor1);showDataList();}});Search.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//SearchshowDataList();}});}private void showDataList() {StringBuilder sb = new StringBuilder();List<PersonInfor>personInfors = mDbController.searchAll();for(PersonInfor personInfor:personInfors){// dataArea.setText("id:"+p);sb.append("id:").append(personInfor.getId()).append("perNo:").append(personInfor.getPerNo()).append("name:").append(personInfor.getName()).append("sex:").append(personInfor.getSex()).append("\n");}dataArea.setText(sb.toString());}private void initView() {Add = findViewById(R.id.Add);Delete = findViewById(R.id.Delete);Update = findViewById(R.id.Update);Search = findViewById(R.id.Search);dataArea= findViewById(R.id.tips);}
}

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