import org.xutils.DbManager; //导入依赖的package包/类
private DownloadManager() {
    DbManager.DaoConfig daoConfig = new DbManager.DaoConfig()
            .setDbName("download")
            .setDbVersion(1);
    db = x.getDb(daoConfig);
    try {
        List<DownloadInfo> infoList = db.selector(DownloadInfo.class).findAll();
        if (infoList != null) {
            for (DownloadInfo info : infoList) {
                if (info.getState().value() < DownloadState.FINISHED.value()) {
                    info.setState(DownloadState.STOPPED);
                }
                downloadInfoList.add(info);
            }
        }
    } catch (DbException ex) {
        LogUtil.e(ex.getMessage(), ex);
    }
}
 

import org.xutils.DbManager; //导入依赖的package包/类
TableEntity(DbManager db, Class<T> entityType) throws Throwable {
    this.db = db;
    this.entityType = entityType;
    this.constructor = entityType.getConstructor();
    this.constructor.setAccessible(true);
    Table table = entityType.getAnnotation(Table.class);
    this.name = table.name();
    this.onCreated = table.onCreated();
    this.columnMap = TableUtils.findColumnMap(entityType);

    for (ColumnEntity column : columnMap.values()) {
        if (column.isId()) {
            this.id = column;
            break;
        }
    }
}
 

import org.xutils.DbManager; //导入依赖的package包/类
@Override
public void onUpgrade(DbManager db, int oldVersion, int newVersion) {
    // TODO: ...
    // db.addColumn(...);
    // db.dropTable(...);
    // ...
    // or
    // db.dropDb();
}
 

import org.xutils.DbManager; //导入依赖的package包/类
public synchronized static DbManager getInstance(DaoConfig daoConfig) {

        if (daoConfig == null) {//使用默认配置
            daoConfig = new DaoConfig();
        }

        DbManagerImpl dao = DAO_MAP.get(daoConfig);
        if (dao == null) {
            dao = new DbManagerImpl(daoConfig);
            DAO_MAP.put(daoConfig, dao);
        } else {
            dao.daoConfig = daoConfig;
        }

        // update the database if needed
        SQLiteDatabase database = dao.database;
        int oldVersion = database.getVersion();
        int newVersion = daoConfig.getDbVersion();
        if (oldVersion != newVersion) {
            if (oldVersion != 0) {
                DbUpgradeListener upgradeListener = daoConfig.getDbUpgradeListener();
                if (upgradeListener != null) {
                    upgradeListener.onUpgrade(dao, oldVersion, newVersion);
                } else {
                    try {
                        dao.dropDb();
                    } catch (DbException e) {
                        LogUtil.e(e.getMessage(), e);
                    }
                }
            }
            database.setVersion(newVersion);
        }

        return dao;
    }
 

import org.xutils.DbManager; //导入依赖的package包/类
public DbManager.DaoConfig getDaoConfig() {
    //初始化数据库o
    DbManager.DaoConfig daoConfig = new DbManager.DaoConfig()
            .setDbName("comic_db")
            .setDbVersion(1)
            .setDbOpenListener(db -> {
                // 开启WAL, 对写入加速提升巨大
                db.getDatabase().enableWriteAheadLogging();
            })
            .setDbUpgradeListener((db, oldVersion, newVersion) -> db.getDatabase().enableWriteAheadLogging());
    return daoConfig;
}
 

import org.xutils.DbManager; //导入依赖的package包/类
public List<Child> getChildren(DbManager db) throws DbException {
    return db.selector(Child.class).where("parentId", "=", this.id).findAll();
}
 

import org.xutils.DbManager; //导入依赖的package包/类
public Parent getParent(DbManager db) throws DbException {
    return db.findById(Parent.class, parentId);
}
 

import org.xutils.DbManager; //导入依赖的package包/类
@Override
public void onDbOpened(DbManager db) {
    // 开启WAL, 对写入加速提升巨大
    db.getDatabase().enableWriteAheadLogging();
}
 

import org.xutils.DbManager; //导入依赖的package包/类
public DbManager getDb() {
    return db;
}
 

import org.xutils.DbManager; //导入依赖的package包/类
@Override
public void onDbOpened(DbManager db) {
    db.getDatabase().enableWriteAheadLogging();
}
 

import org.xutils.DbManager; //导入依赖的package包/类
public static DbManager getInstance() {
    return x.getDb(daoConfig);
}
 

import org.xutils.DbManager; //导入依赖的package包/类
private PhotoManager () {
    mConfig = new DbManager.DaoConfig();
    mDb = x.getDb(mConfig);
}
 

import org.xutils.DbManager; //导入依赖的package包/类
@Override
public void onUpgrade(DbManager db, int oldVersion, int newVersion) {

}