fuquanapi/src/main/java/com/example/webapi/service/SupplyVarietyService.java

package com.example.webapi.service;

import com.example.webapi.dto.SupplyVarietyQueryDTO;
import com.example.webapi.entity.SupplyVariety;
import com.example.webapi.repository.SupplyVarietyRepository;
import com.example.webapi.util.PageUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.ExampleMatcher;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;

import java.util.Optional;

@Service
public class SupplyVarietyService {

    @Autowired
    private SupplyVarietyRepository repository;

    public Page<SupplyVariety> findAll(Pageable pageable) {
        return repository.findAll(pageable);
    }

    /**
     * 根据条件查询供应标识品种信息（分页）
     * 
     * @param queryDTO 查询条件（包含分页参数）
     * @return 分页结果
     */
    public Page<SupplyVariety> findByConditions(SupplyVarietyQueryDTO queryDTO) {
        // 从QueryDTO中提取分页参数
        Pageable pageable = PageUtil.createPageable(queryDTO);
        
        // 创建实体对象作为查询条件
        SupplyVariety probe = new SupplyVariety();
        
        // 设置查询条件（只设置非空值）
        if (queryDTO.getSupplyId() != null) {
            probe.setSupplyId(queryDTO.getSupplyId());
        }
        if (queryDTO.getGood() != null) {
            probe.setGood(queryDTO.getGood());
        }
        if (queryDTO.getActive() != null) {
            probe.setActive(queryDTO.getActive());
        }
        
        // 创建ExampleMatcher，配置精确匹配
        ExampleMatcher matcher = ExampleMatcher.matching()
                .withIgnoreNullValues();  // 忽略空值
        
        // 创建Example对象
        Example<SupplyVariety> example = Example.of(probe, matcher);
        
        // 执行查询
        return repository.findAll(example, pageable);
    }

    public Optional<SupplyVariety> findById(Integer id) {
        return repository.findById(id);
    }

    public SupplyVariety save(SupplyVariety entity) {
        return repository.save(entity);
    }

    public void deleteById(Integer id) {
        repository.deleteById(id);
    }
}