关于greendao

greendao官网 GitHub 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。

db相关的package及class

配置

app的build.gradle中

• apply plugin: 'org.greenrobot.greendao' // apply plugin

•   greendao{      //指定数据库schema版本号，迁移等操作会用到；      schemaVersion 1      //通过gradle插件生成的数据库相关文件的包名，默认为你的entity所在的包名；      daoPackage 'com.hyzlseries.march.claimupload.db.dao'      //自定义生成数据库文件的目录，可以将生成的文件放到我们的java目录中，而不是build中，这样就不用额外的设置资源目录了。      targetGenDir 'src/main/java'  }复制代码

• compile 'org.greenrobot:greendao:3.2.2' // add library

project的build.gradle中

• classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2' // add plugin

存储EntityA类型的数据 Entity申明

• 服务器返回的数据

`{"Rows": 0,"Results": [{"ScanTime": "2017-10-16","InsuredID": 3521,"AccountName": "李海玲","IDCardNo": "420106197412240849","InsClaimCaseID": "RSFJXYYHY171016010001","ReceiptNumber": 1,"ImgNumber": 2,"ClaimCaseState": 14,"ClaimCaseStateName": null,"Memo": null,"InsCompanyID": 1,"InsCompanyName": "中国人民人寿保险股份有限公司福建省分公司","InsCompanyCode": "RSFJ","CompanyID": 1,"CompanyName": "兴业银行股份有限公司","CompanyCode": "XYYH","APPReceiptList": [{"ReceiptID": 849,"ReceiptNo": "0124","ReceitpTime": null,"ImagePath": "/中国人民人寿保险股份有限公司福建省分公司/20171016/oth/RSFJXYYHY171016/201710161558504500385.jpg","ReceiptType": 1,"ReceiptTypeName": "发票","InsClaimCaseID": "RSFJXYYHY171016010001","Operator": 0},{"ReceiptID": 1383,"ReceiptNo": "资料","ReceitpTime": null,"ImagePath": "/中国人民人寿保险股份有限公司福建省分公司/20171016/rec/RSFJXYYHY171016/201710161555539199416.jpg","ReceiptType": 2,"ReceiptTypeName": "非发票","InsClaimCaseID": "RSFJXYYHY171016010001","Operator": 0}]}],"Total": 1,"Code": "0000","Message": "查询成功"
}
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• Entity申明

@Entity
public class ScanDetailModel {//不能用int  GreenDao的主键必须设置成包装类 Long , 大写L  参考：http://blog.csdn.net/sunsteam/article/details/52634945@Id(autoincrement = true)private Long id;@Uniqueprivate String InsClaimCaseID;private String AccountName;private String IDCardNo;private int ReceiptNumber;private String ScanTime;private int InsuredID;private int ImgNumber;private String Memo;private String InsCompanyID;private String InsCompanyCode;private String InsCompanyName;private int CompanyID;private int ClaimCaseState;private String CompanyCode;private String CompanyName;@Convert(/**指定转换器 **/converter = ModelConverent2String.class,/**指定数据库中的列字段**/columnType = String.class)private List<ReceiptModel> APPReceiptList;//案件发票集合...
}
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如上在申明EntityA的List<EntityB>属性的时候，需要指定转换器，即添加@Convert()注解。

ModelConverent2String类

/*** =============================================* 作    者：Junl(袁军亮)* 版    本：1.0* 描    述：主要是通过greenDao 提供的PropertyConverter，gson，转换对象到字符串存到数据库。* 参    考：http://blog.csdn.net/zhangle1hao/article/details/71412999  http://blog.csdn.net/zxm317122667/article/details/73528387* 创建日期：2017/11/9* 人生如诗：人生若只如初见，何事秋风悲画扇。* =============================================*/public class ModelConverent2String implements PropertyConverter<List<ReceiptModel>, String> {@Overridepublic List<ReceiptModel> convertToEntityProperty(String databaseValue) {Type type = new TypeToken<ArrayList<ReceiptModel>>() {}.getType();ArrayList<ReceiptModel> itemList = new Gson().fromJson(databaseValue, type);return itemList;}@Overridepublic String convertToDatabaseValue(List<ReceiptModel> entityProperty) {String dbString = new Gson().toJson(entityProperty);return dbString;}
}
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增删改查

/*** =============================================* 作    者：Junl(袁军亮)* 版    本：1.0* 描    述：数据库增删改查* <p>* 创建日期：2017/11/9* 人生如诗：人生若只如初见，何事秋风悲画扇。* =============================================*/public class ScanDetailDaoUtil {private static final String TAG = ScanDetailDaoUtil.class.getSimpleName();public ScanDetailDaoUtil() {}/*** 新增数据*/public static boolean insert(ScanDetailModel model) {try {boolean flag;flag = App.getDaoSession().getScanDetailModelDao().insert(model) == -1 ? false : true;return flag;} catch (Exception e) {e.printStackTrace();}return false;}/*** 查询* @param InsClaimCaseID* @return*/public static ScanDetailModel query(String InsClaimCaseID) {try {ScanDetailModel model = App.getDaoSession().getScanDetailModelDao().queryBuilder().where(ScanDetailModelDao.Properties.InsClaimCaseID.eq(InsClaimCaseID)).unique();return model;} catch (Exception e) {e.printStackTrace();}return null;}/*** @param InsClaimCaseID  案件号* @param position 要删除的位置* @return** 删除思路：查询到ModelB ---> 删除position对应的ModelA--->update*/public static boolean delete(String InsClaimCaseID , int position) {try {if (!JudgeNullUtil.iStr(InsClaimCaseID))return false;ScanDetailModel model = App.getDaoSession().getScanDetailModelDao().queryBuilder().where(ScanDetailModelDao.Properties.InsClaimCaseID.eq(InsClaimCaseID)).build().unique();if (model != null) {List<ReceiptModel> receiptList = model.getAPPReceiptList();if (JudgeNullUtil.iList(receiptList)) {receiptList.remove(position);//update(InsClaimCaseID,model);}return true;}return false;} catch (Exception e) {e.printStackTrace();}return false;}/*** 解决bug:Cannot update entity without key - was it inserted before?* blog.csdn.net/plmmmmlq/article/details/50404495* @param shop*/public static void update(String InsClaimCaseID ,ScanDetailModel shop) {try {List<ScanDetailModel> list = App.getDaoSession().getScanDetailModelDao().queryBuilder().where(ScanDetailModelDao.Properties.InsClaimCaseID.eq(InsClaimCaseID)).build().list();ScanDetailModel model = list.get(0);shop.setId(model.getId());App.getDaoSession().getScanDetailModelDao().update(shop);} catch (Exception e) {e.printStackTrace();}}
}
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碰到的问题

• 如何操作List<EntityB> 中EntityB的某一个属性，如ReceiptModel类中ReceiptNo属性更改。 解决方案： update 如update不起作用 ，可以query先拿到Entity属性值，设置完毕后再update