ChannelDbHelper.java
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package com.wd.room;
import android.content.Context;
import com.wd.room.dao.ChannelDao;
import com.wd.room.entity.ChannelBean;
import java.util.ArrayList;
import java.util.List;
/**
* 需要异步操作数据库
*
* @author : wd
* @since: 2023/3/10
*/
public class ChannelDbHelper {
public static ChannelDbHelper instance;
/**
* 不对外暴露
*/
private static ChannelDao dao;
public static ChannelDbHelper getInstance(Context context){
if (null == instance){
synchronized (ChannelDbHelper.class){
if (null == instance){
instance = new ChannelDbHelper();
build(context);
}
}
}
return instance;
}
private static void build(Context context){
dao = RoomUtils.getInstance().getChannelDao(context);
}
public synchronized void save(List<ChannelBean> channelEntities) {
try{
dao.insertOrUpdate(channelEntities);
}catch (IllegalStateException e){
e.printStackTrace();
}
}
// public synchronized List<ChannelBean> searchAllSelectLocalChannel() {
// try{
// return dao.queryAllBySelectCategoryType(1,"3");
// }catch (IllegalStateException e){
// return new ArrayList<>();
// }
// }
/**
* 查询“我的频道”栏目所有频道数据
* @return
*/
public synchronized List<ChannelBean> searchAllSelectChannel() {
try{
return dao.queryAllBySelect(1);
}catch (IllegalStateException e){
return new ArrayList<>();
}
}
/**
* 查询 非我的频道 栏目频道数据
* @return
*/
public synchronized List<ChannelBean> searchAllUnSelectChannel() {
try{
return dao.queryAllBySelect(0);
}catch (IllegalStateException e){
return new ArrayList<>();
}
}
// public synchronized List<ChannelBean> searchAllUnSelectRightChannel() {
// try{
// return dao.queryAllBySelectUnCategoryType(0,"3");
// }catch (IllegalStateException e){
// return new ArrayList<>();
// }
// }
public synchronized void deleteAll() {
try{
dao.clear();
}catch (IllegalStateException e){
e.printStackTrace();
}
}
// public synchronized List<ChannelBean> searchAllLeftChannel() {
// try{
// return dao.searchAllByCategoryType("3");
// }catch (IllegalStateException e){
// return new ArrayList<>();
// }
// }
//
// public synchronized List<ChannelBean> searchChannelByName(String name) {
// try{
// return dao.searchChannelByName(name);
// }catch (IllegalStateException e){
// return new ArrayList<>();
// }
// }
//
// public synchronized ChannelBean searchLeftChannelById(String channelId) {
// try{
// return dao.searchByIdCategoryType(channelId,"3");
// }catch (IllegalStateException e){
// return null;
// }
// }
// public synchronized List<ChannelBean> searchAllUnSelectLeftChannel() {
// try{
// return dao.queryAllBySelectCategoryType(0,"3");
// }catch (IllegalStateException e){
// return new ArrayList<>();
// }
// }
public synchronized boolean hasData(){
try{
return null != dao.getFisrtData();
}catch (IllegalStateException e){
return false;
}
}
public synchronized List<ChannelBean> getData(){
try{
return dao.getData();
}catch (IllegalStateException e){
return new ArrayList<>();
}
}
}