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src/main/java/com/example/service/DoctorPatientService.java

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+package com.example.service;
+
+import cn.hutool.core.date.DateUtil;
+import cn.hutool.core.util.ObjectUtil;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.example.common.Result;
+import com.example.entity.Doctor;
+import com.example.entity.DoctorPatient;
+import com.example.entity.Patient;
+import com.example.mapper.DoctorMapper;
+import com.example.mapper.DoctorPatientMapper;
+import com.example.mapper.PatientMapper;
+import jakarta.annotation.Resource;
+import org.springframework.stereotype.Service;
+
+import java.util.Date;
+import java.util.List;
+
+@Service
+public class DoctorPatientService {
+
+    @Resource
+    private DoctorPatientMapper doctorPatientMapper;
+    
+    @Resource
+    private DoctorMapper doctorMapper;
+    
+    @Resource
+    private PatientMapper patientMapper;
+
+    /**
+     * 新增医生患者关系
+     * @param doctorPatient 关系信息
+     */
+    public void add(DoctorPatient doctorPatient) {
+        // 检查医生ID是否存在
+        Doctor doctor = doctorMapper.selectById(doctorPatient.getDoctorId());
+        if (ObjectUtil.isEmpty(doctor)) {
+            throw new RuntimeException("医生不存在");
+        }
+        
+        // 检查患者ID是否存在
+        Patient patient = patientMapper.selectById(doctorPatient.getPatientId());
+        if (ObjectUtil.isEmpty(patient)) {
+            throw new RuntimeException("患者不存在");
+        }
+        
+        // 检查关系是否已存在
+        LambdaQueryWrapper<DoctorPatient> queryWrapper = new LambdaQueryWrapper<>();
+        queryWrapper.eq(DoctorPatient::getDoctorId, doctorPatient.getDoctorId())
+                .eq(DoctorPatient::getPatientId, doctorPatient.getPatientId())
+                .eq(DoctorPatient::getStatus, "正常");
+        
+        if (doctorPatientMapper.selectCount(queryWrapper) > 0) {
+            throw new RuntimeException("医生和患者关系已存在");
+        }
+        
+        // 设置默认值
+        doctorPatient.setRelationshipStart(new Date());
+        doctorPatient.setStatus("正常");
+        doctorPatient.setCreateTime(new Date());
+        
+        doctorPatientMapper.insert(doctorPatient);
+    }
+    
+    /**
+     * 更新医生患者关系
+     * @param doctorPatient 关系信息
+     */
+    public void update(DoctorPatient doctorPatient) {
+        DoctorPatient dbDoctorPatient = doctorPatientMapper.selectById(doctorPatient.getId());
+        if (ObjectUtil.isEmpty(dbDoctorPatient)) {
+            throw new RuntimeException("关系不存在");
+        }
+        
+        doctorPatientMapper.updateById(doctorPatient);
+    }
+    
+    /**
+     * 删除医生患者关系
+     * @param id 关系ID
+     */
+    public void delete(Integer id) {
+        doctorPatientMapper.deleteById(id);
+    }
+    
+    /**
+     * 结束医生患者关系
+     * @param id 关系ID
+     */
+    public void endRelationship(Integer id) {
+        DoctorPatient doctorPatient = doctorPatientMapper.selectById(id);
+        if (ObjectUtil.isEmpty(doctorPatient)) {
+            throw new RuntimeException("关系不存在");
+        }
+        
+        doctorPatient.setStatus("已结束");
+        doctorPatientMapper.updateById(doctorPatient);
+    }
+    
+    /**
+     * 根据医生ID查询患者
+     * @param doctorId 医生ID
+     * @param name 患者姓名（可选）
+     * @return 患者列表
+     */
+    public List<DoctorPatient> selectByDoctorId(Integer doctorId, String name) {
+        return doctorPatientMapper.selectByDoctorId(doctorId, name);
+    }
+    
+    /**
+     * 根据患者ID查询医生
+     * @param patientId 患者ID
+     * @param name 医生姓名（可选）
+     * @return 医生列表
+     */
+    public List<DoctorPatient> selectByPatientId(Integer patientId, String name) {
+        return doctorPatientMapper.selectByPatientId(patientId, name);
+    }
+}