Question

我想在PageRequest中制作一个JdbcTemplate。我不想做的是使用JPA。我搜索了近4个小时但找不到任何有用的东西。请告诉我们我，如果可能，我该怎么办

修改我想从Oracle重新加载数据，但不想使用JPARepository 这是我的代码。这是我的控制器

@RestController
@RequestMapping(value = "/admin")
public class OrderController {

@Autowired
private OrderService orderService;

@RequestMapping(value = "/reload", method = RequestMethod.GET)
public List<Order> reload(){
    return  orderService.reload();
}

这是我的服务

@Service
public class OrderService {

@Autowired
private OrderRepository orderRepository;

public List<Order> reload(){
    return orderRepository.reload();
}

这是我的存储库

@Repository
public interface OrderRepository {

public List<Order> reload();
}

这是我的repositoryImpl类

 @Repository
 public class OrderRepositoryImpl implements OrderRepository{

@Autowired
private JdbcTemplate jdbcTemplate; 
@Override
public List<Order> reload(){

}

Answer 1

Using spring-data-commons

import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.repository.support.PageableExecutionUtils;
import org.springframework.data.repository.support.PageableExecutionUtils.TotalSupplier;

/**
 * @param content list from jdbcTemplate
 * @param pageNum : zero-based, if null default to zero
 * @param pageSize : if null default list size
 * @return Page object (zero-based)
 */
public static <T> Page<T> pagingList(List<T> content, Integer pageNum, Integer pageSize){
    Assert.notNull(content, "List content must not be null!");
    pageNum = (pageNum == null) ? 0 : pageNum;
    pageSize = (pageSize == null) ? content.size() : pageSize;

    PageRequest pageable = new PageRequest(pageNum, pageSize);

    //System.out.println(" ======== PAGEABLE ========= ");
    //System.out.println(" pageable.getOffset     : " + pageable.getOffset());
    //System.out.println(" pageable.getPageNumber : " + pageable.getPageNumber());
    //System.out.println(" pageable.getPageSize   : " + pageable.getPageSize());

    TotalSupplier totalSupplier = new TotalSupplier() {

        @Override
        public long get() {
            return content.size();
        }
    };

    int fromOffset = pageable.getOffset();
    int toOffset =  Math.min(content.size(), fromOffset + pageSize);
    List<T> listPaging = new ArrayList<>();
    if(fromOffset < toOffset){
        listPaging = content.subList(fromOffset, toOffset);
    }
    return PageableExecutionUtils.getPage(listPaging, pageable, totalSupplier);
}

Above code does :

Accept list from jdbcTemplate
Create PageRequest object (with pageNum and pageSize)
Create subList from original list start from element fromOffset and toOffset

Be aware for huge size of list, not yet testing it.

Reference : Github spring-data-jpa

如何在Spring启动时使用JdbcTemplate进行Pagerequest

1 个答案: