private static synchronized DbUtils getInstance(DaoConfig daoConfig) {
DbUtils dao = daoMap.get(daoConfig.getDbName());
if (dao == null) {
dao = new DbUtils(daoConfig);
daoMap.put(daoConfig.getDbName(), 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) {
LogUtils.e(e.getMessage(), e);
}
}
}
database.setVersion(newVersion);
}
return dao;
}
private FinalDb(DaoConfig config) {
if (config == null) throw new DbException("daoConfig is null");
if (config.getContext() == null) throw new DbException("android context is null");
if (config.type == 1) {
File file = new File(config.getContext().getFilesDir(), config.getDbName());
if (!file.exists()) {
// 拷贝数据库
try {
InputStream is = config.getContext().getAssets().open(config.getDbName());
Utils.copyFile(is, file);
} catch (Exception e) {
e.printStackTrace();
}
}
this.db = SQLiteDatabase.openOrCreateDatabase(file, null);
} else if (config.getTargetDirectory() != null
&& config.getTargetDirectory().trim().length() > 0
&& config.type != 1) {
this.db = createDbFileOnSDCard(config.getTargetDirectory(), config.getDbName());
} else {
this.db =
new SqliteDbHelper(
config.getContext().getApplicationContext(),
config.getDbName(),
config.getDbVersion(),
config.getDbUpdateListener())
.getWritableDatabase();
}
this.config = config;
}