Android – 绿道多重交易

我在greendao示例中有多个事务的问题我已经有两个名称簿和type_book的表。

我已经有这样的代码：

SQLiteDatabase db = bookMasterDao.getDatabase(); db.beginTransaction(); try { bookMasterDao.insert(bookMaster); idBook = bookMaster.getId().intValue(); db.setTransactionSuccessful(); } catch (Exception ex) { System.out.println("Error insert book master " + ex); } finally { db.endTransaction(); } SQLiteDatabase dbTypeBook = typeBookMasterDao.getDatabase(); dbTypeBook.beginTransaction(); try { typeBookMasterDao.insert(bookMaster); dbTypeBook.setTransactionSuccessful(); } catch (Exception ex) { System.out.println("Error insert type book" + ex); } finally { dbTypeBook.endTransaction(); } 

我想如果事务类型书故障插入，事务簿主要回滚我的意思是取消插入数据书主。 如何进行这样的交易？

任何想法，参考和例子非常有用，谢谢你。

Answer 1

我想你误解了原则。 尝试创建db，启动事务，用daoMaster包装数据库，使用session进行插入，然后设置事务成功。 看看代码。

 SQLiteDatabase db = openOrCreateDatabase("db", MODE_PRIVATE, null); DaoMaster.createAllTables(db, true); db.beginTransaction(); try { DaoMaster daoMaster = new DaoMaster(db); DaoSession daoSession = daoMaster.newSession(); Book book = new Book(); Book2 book2 = new Book2(); //insert on specific session daoSession.getBookDao().insert(book); //set some relation to inserted book book2.setBook(book); //if this fails, book and book2 won't be in db //insert withou specific session daoSession.insert(book2); db.setTransactionSuccessful(); } catch (Exception ex) { ex.printStackTrace(); } finally { db.endTransaction(); db.close(); }