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[文章] 你的2019总结来了吗？【有奖征文】

你的年终总结写了吗？后面得写代码去实现抽奖的功能了。这一次，我们走一次人工流程。后面再用代码实现。要不要要来个抽奖呢？要的，为了拉低概率，赶紧参与吧！

2019-12-22 20:36 · 总结2019 / 展望2020 / 征文活动 / 程序员日常

[文章] 【总结2019 展望2020】（技术教程）简述GreenDao的一般使用步骤

简述GreenDao的一般使用步骤1.在bulid.gradle（Module:app）中添加greendao如下配置(添加依赖)greendao{schemaVersion1//TODO数据库版本号daoPackage'com.example.smart.greendaodemo.db'//TODO设置DaoMaster、DaoSession、Dao包名targetGenDir'src/main/java'//TODO设置DaoMaster、DaoSession、Dao目录}2.编写MyApplication继承至Applicationimportandroid.app.Application;importandroid.database.sqlite.SQLiteDatabase;importcom.example.smart.greendaodemo.db.DaoMaster;importcom.example.smart.greendaodemo.db.DaoSession;publicclassMyApplicationextendsApplication{privateDaoSessiondaoSession;publicstaticMyApplicationmyApplication;publicstaticMyApplicationgetInstance(){returnmyApplication;}@OverridepublicvoidonCreate(){super.onCreate();initGreenDao();}/***初始化GreenDao*/privatevoidinitGreenDao(){DaoMaster.DevOpenHelperopenHelper=newDaoMaster.DevOpenHelper(this,"Info.db");SQLiteDatabasedb=openHelper.getWritableDatabase();DaoMasterdaoMaster=newDaoMaster(db);daoSession=daoMaster.newSession();myApplication=this;}/***获取DaoSession**@return*/publicDaoSessiongetDaoSession(){returndaoSession;}}3.在AndroidManifest.xml清单文件中的application节点添加name属性，并指定为MyApplication的类名.包名。4.生成Bean类importorg.greenrobot.greendao.annotation.Entity;importorg.greenrobot.greendao.annotation.Generated;importorg.greenrobot.greendao.annotation.Id;importorg.greenrobot.greendao.annotation.Unique;//TODO在Bean类中需要在类中添加如下注解@EntitypublicclassGreenDaoBean{@Unique@IdprivateStringname;privateStringsex;privateintage;privateStringphone;//TODO如下构造方法皆为自动生成，一般不用自己生成@Generated(hash=1389179617)publicGreenDaoBean(Stringname,Stringsex,intage,Stringphone){this.name=name;this.sex=sex;this.age=age;this.phone=phone;}//TODO如下构造方法皆为自动生成，一般不用自己生成@Generated(hash=826843181)publicGreenDaoBean(){}publicStringgetName(){returnname;}publicvoidsetName(Stringname){this.name=name;}publicStringgetSex(){returnsex;}publicvoidsetSex(Stringsex){this.sex=sex;}publicintgetAge(){returnage;}publicvoidsetAge(intage){this.age=age;}publicStringgetPhone(){returnphone;}publicvoidsetPhone(Stringphone){this.phone=phone;}//TODO看自己需不需要toString@OverridepublicStringtoString(){return"GreenDaoBean{"+"name='"+name+'\''+",sex='"+sex+'\''+",age="+age+",phone='"+phone+'\''+'}';}}5.使用时需要做的事情（固定写法）privateMyApplicationmyApplication=MyApplication.getInstance();privateDaoSessiondaoSession;privateList<GreenDaoBean>greenDaoBeans=newArrayList<>();@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_my_green_dao);daoSession=myApplication.getDaoSession();//TODO与数据库的相关操作请放到子线程中执行！（对数据库的操作为耗时操作）newThread(newRunnable(){@Overridepublicvoidrun(){greenDaoBeans=daoSession.getGreenDaoBeanDao().loadAll();}}).start();}

2019-12-27 13:28 · 数据库操作 / 总结2019 / 展望2020