Analysis of the scientific principle principles of ORMLITE JDBC framework in the Java library

ORMLITE is a lightweight object relationship mapping (ORM) framework for operating databases in the Java class library.It provides easy -to -use APIs to perform common database operations, such as insertion, query, update and deletion.ORMLITE also supports transaction processing so that developers can achieve atomicity and consistency in database operations. A series of interconnected database operations are performed as a unit.If any operation fails or errors, the entire transaction will be rolled back and will not be submitted.ORMLITE implements transaction processing through the following principles: 1. Define transaction processing block: In Java, we can use anonymous internal classes or Lambda expressions to define transaction processing blocks.The following is a simple example: try (ConnectionSource connectionSource = new JdbcConnectionSource(databaseUrl)) { // Starting transaction TransactionManager.callInTransaction(connectionSource, () -> { // Perform the database operation here // ... return null; }); } 2. Get the database connection: ORMLITE obtains the database connection through the `ConnectionSource` object.In transaction processing, we need to get the database connection first. 3. Open transaction: Once we get the database connection, we can call the method to start a new transaction.This method accepts an `ConnectionSource` object and a transaction processing block that implements the` Callable` interface as a parameter. 4. Perform database operation: In transaction processing blocks, we can perform any database operations, such as inserting, querying, updating and deleting.Using the DAO (data access object) provided by ORMLITE can easily perform these operations.Because the transaction processing block is executed in the same transaction, each operation will be controlled by the transaction. 5. Submit or roll back transactions: After the execution of the transaction processing block is completed, you can choose to submit or roll the transaction.If an exception is thrown in the transaction processing block, the transaction will be rolled automatically.If there is no abnormal throwing, you can manually submit the transaction by returning a result from the transaction processing block. Summarize: ORMLITE makes transaction processing very simple in the Java library.By defining transaction processing blocks, obtaining database connections, executing database operations, and submission or rollback transactions, we can ensure the atomicity and consistency of database operations.The above is an analysis of the principles of transaction processing technical principles in the ORMLITE JDBC framework in the Java library. I hope it will be helpful to you. 【Java Code Example】 The following is a simple example of using ORMLITE execution transaction processing: try (ConnectionSource connectionSource = new JdbcConnectionSource(databaseUrl)) { // Starting transaction TransactionManager.callInTransaction(connectionSource, () -> { try { // Get DAO object Dao<Account, Integer> accountDao = DaoManager.createDao(connectionSource, Account.class); Dao<Transfer, Integer> transferDao = DaoManager.createDao(connectionSource, Transfer.class); // Execute the database operation Account fromAccount = accountDao.queryForId(fromAccountId); Account toAccount = accountDao.queryForId(toAccountId); double amount = 100.0; if (fromAccount.getBalance() >= amount) { fromAccount.setBalance(fromAccount.getBalance() - amount); toAccount.setBalance(toAccount.getBalance() + amount); // Update account information accountDao.update(fromAccount); accountDao.update(toAccount); // Create a transfer record Transfer transfer = new Transfer(fromAccount, toAccount, amount, new Date()); transferDao.create(transfer); } else { throw new InsufficientBalanceException("Insufficient balance"); } // Manual submission of transactions return null; } catch (SQLException e) { // Roll back transactions throw new RuntimeException("Transaction failed", e); } }); } In the above example, we first obtained the DAO objects of the two database tables of the two database tables of the `Account` and` Transfer`, and then deducted the corresponding amount from one account according to the given transfer amount, added to the other account, and separately, respectivelyUpdate the information of the two accounts.Finally, we created a transfer record and inserted it into the `Transfer` table.If any operation fails, the transaction will be rolled back, otherwise the transaction will be submitted.