使用 Spring Data JPA 简化 JPA 开发 sample code

package footmark.springdata.jpa.service; import footmark.springdata.jpa.dao.UserDao; import footmark.springdata.jpa.domain.AccountInfo; import footmark.springdata.jpa.domain.UserInfo; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.domain.Page; import org.springframework.data.domain.Pageable; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import java.util.List; /** * Author:ZhangJianPing Time:11-9-14,下午5:10 */ @Service("userService") public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; @Transactional public AccountInfo createNewAccount(String username, String password, Integer initBalance) { AccountInfo accountInfo = new AccountInfo(); UserInfo userInfo = new UserInfo(); userInfo.setUsername(username); userInfo.setPassword(password); accountInfo.setBalance(initBalance); accountInfo.setUserInfo(userInfo); return userDao.save(accountInfo); } public AccountInfo findAccountInfoById(Long id) { return userDao.findByAccountId(id); } public List<AccountInfo> findByBalanceGreaterThan(Integer balance,Pageable pageable){ Page<AccountInfo> accounts = userDao.findByBalanceGreaterThan(balance,pageable); return accounts.getContent(); } }