java框架如何支持分布式数据库系统的构建

import org.springframework.data.jdbc.core.JdbcOperations;

public class DistributedDatabaseService {

  private JdbcOperations jdbcOperations;

  public void transferFunds(Account fromAccount, Account toAccount, long amount) {
    // 启动一个事务
    try {
      jdbcOperations.execute("BEGIN");

      // 扣除资金
      long fromAccountBalance = jdbcOperations.queryForObject(
          "SELECT balance FROM accounts WHERE id = ?",
          Long.class,
          fromAccount.getId());
      fromAccountBalance -= amount;
      jdbcOperations.update(
          "UPDATE accounts SET balance = ? WHERE id = ?",
          fromAccountBalance,
          fromAccount.getId());

      // 增加资金
      long toAccountBalance = jdbcOperations.queryForObject(
          "SELECT balance FROM accounts WHERE id = ?",
          Long.class,
          toAccount.getId());
      toAccountBalance += amount;
      jdbcOperations.update(
          "UPDATE accounts SET balance = ? WHERE id = ?",
          toAccountBalance,
          toAccount.getId());

      // 提交事务
      jdbcOperations.execute("COMMIT");
    } catch (Exception e) {
      // 处理错误并回滚事务
      jdbcOperations.execute("ROLLBACK");
      throw e;
    }
  }
}