package com.kucun.Service;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.util.*;
import java.util.stream.Collectors;
import javax.persistence.EntityNotFoundException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.ExampleMatcher;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Service;
import com.kucun.data.entity.*;
import com.kucun.dataDo.*;
@Service
public class AppService {
// 自动注入所有依赖
@Autowired private KucunRepository kucunRepository;
@Autowired private DynamicRepositoryService repositoryService;
@Autowired private EntityDependencyService dependencyService;
/**
* 获取所有实体类型的数据
* @return 包含所有实体数据的Map
*/
public Information getAllData() {
Map<String, Object> response = new HashMap<>();
repositoryService.getRepositoryNameMap().forEach((key, repo) ->
response.put(key + "s", repo.findAll())
);
return Information.NewSuccess(response);
}
/**
* 获取指定实体类型的所有数据
* @param entityName 实体名称
* @return 实体数据列表
*/
public Information getEntityData(String entityName) {
JpaRepository<?, ?> repo = repositoryService.getJpaRepository(entityName);
return Information.NewSuccess(repo.findAll());
}
/**
* 添加新实体
* @param entity 要添加的实体对象
* @return 添加结果
*/
public Information addEntity(Object entity) {
try {
// 处理关联字段
handleAssociations(entity);
// 获取对应的Repository并保存
JpaRepository<Object, Serializable> repo =
(JpaRepository<Object, Serializable>) repositoryService.getJpaRepository(entity.getClass());
Object savedEntity = repo.save(entity);
// 如果是板材，初始化库存
if (savedEntity instanceof Bancai) {
initializeKucunForBancai((Bancai) savedEntity);
}
return Information.NewSuccess(savedEntity);
} catch (Exception ex) {
return Information.Newfail(500, "创建失败: " + ex.getMessage(), null);
}
}
/**
* 更新实体
* @param entity 包含ID的实体对象
* @return 更新结果
*/
public Information updateEntity(Object entity) {
if (entity == null) {
return Information.Newfail(403, "参数为空", null);
}
try {
// 获取ID字段
Field idField = entity.getClass().getDeclaredField("id");
idField.setAccessible(true);
Object idValue = idField.get(entity);
if (idValue == null) {
return Information.Newfail(403, "ID为空", null);
}
// 获取Repository和现有实体
JpaRepository<Object, Serializable> repo =
(JpaRepository<Object, Serializable>) repositoryService.getJpaRepository(entity.getClass());
Object existingEntity = repo.findById((Serializable) idValue)
.orElseThrow(() -> new RuntimeException("实体不存在"));
// 复制非空属性并保存
copyNonNullProperties(entity, existingEntity);
return Information.NewSuccess(repo.save(existingEntity));
} catch (Exception ex) {
return Information.Newfail(500, "更新失败: " + ex.getMessage(), null);
}
}
/**
* 删除实体
* @param entity 要删除的实体
* @return 删除结果
*/
public Information deleteEntity(EntityBasis entity) {
if (entity == null) {
return Information.NewFail("删除对象不能为空");
}
try {
String entityName = entity.getClass().getSimpleName().toLowerCase();
JpaRepository<Object, Serializable> repo =
(JpaRepository<Object, Serializable>) repositoryService.getJpaRepository(entityName);
// 先加载完整实体（关键步骤）
Object fullEntity = repo.findById(entity.getId())
.orElseThrow(() -> new EntityNotFoundException("实体不存在"));
System.out.println("// 获得实体");
if(entity instanceof Bancai) {
if(((Bancai)fullEntity).getKucun()!=null&&((Bancai)fullEntity).getKucun().getShuliang()>0) {
return Information.NewFail("库存不为零，无法删除");
}
}
System.out.println("// 检查库存");
// 检查依赖关系
if (dependencyService.hasDependencies(entity.getClass(), entity.getId())) {
return Information.NewFail("该记录已被引用，无法删除");
}
System.out.println("// 检查依赖关系");
// 使用实体对象删除（触发级联操作）
repo.delete(fullEntity);
return Information.NewSuccess("删除成功");
} catch (Exception e) {
return Information.NewFail("删除错误: " + e.getMessage());
}
}
/**
* 动态查询实体
* @param entity 包含查询条件的实体对象
* @return 查询结果
*/
public <T> Information queryEntity(T entity) {
if (entity == null) {
return Information.NewFail("查询参数不能为空");
}
try {
JpaRepository<T, ?> repo = (JpaRepository<T, ?>) repositoryService.getJpaRepository(entity.getClass());
Example<T> example = Example.of(entity, ExampleMatcher.matching()
.withIgnoreNullValues()
.withStringMatcher(ExampleMatcher.StringMatcher.CONTAINING));
return Information.NewSuccess(repo.findAll(example));
} catch (Exception e) {
return Information.NewFail("查询失败: " + e.getMessage());
}
}
// ====================== 私有辅助方法 ======================
/**
* 为板材初始化库存
* @param bancai 板材对象
*/
private void initializeKucunForBancai(Bancai bancai) throws Exception {
Kucun kucun = new Kucun(null, bancai, 0);
bancai.setKucun(kucunRepository.save(kucun));
}
/**
* 处理实体关联关系
* @param entity 要处理的实体
*/
private void handleAssociations(Object entity) throws Exception {
for (Field field : entity.getClass().getDeclaredFields()) {
field.setAccessible(true);
Object value = field.get(entity);
if (value == null) continue;
// 处理 JPA 实体关联
if (value instanceof EntityBasis) {
EntityBasis associated = (EntityBasis) value;
JpaRepository<Object, Serializable> repo =
(JpaRepository<Object, Serializable>) repositoryService.getJpaRepository(associated.getClass().getSimpleName().toLowerCase());
// 只处理已存在实体（不创建新关联）
if (associated.getId() != null) {
Object managedEntity = repo.findById(associated.getId())
.orElseThrow(() -> new RuntimeException("关联实体不存在"));
field.set(entity, managedEntity);
}
}
// 处理集合关联
else if (value instanceof Collection) {
List<Object> managedEntities = new ArrayList<>();
for (Object item : (Collection<?>) value) {
if (item instanceof EntityBasis) {
EntityBasis eb = (EntityBasis) item;
JpaRepository<Object, Serializable> repo =
(JpaRepository<Object, Serializable>) repositoryService.getJpaRepository(eb.getClass().getSimpleName().toLowerCase());
if (eb.getId() != null) {
managedEntities.add(repo.findById(eb.getId())
.orElseThrow(() -> new RuntimeException("关联实体不存在")));
}
}
}
if (!managedEntities.isEmpty()) {
field.set(entity, managedEntities);
}
}
}
}
/**
* 复制非空属性
* @param source 源对象
* @param target 目标对象
*/
private void copyNonNullProperties(Object source, Object target) throws IllegalAccessException {
for (Field field : source.getClass().getDeclaredFields()) {
field.setAccessible(true);
Object value = field.get(source);
// 跳过关联字段和ID字段
if (value != null &&
!(value instanceof EntityBasis) &&
!(value instanceof Collection) &&
!field.getName().equals("id")) {
try {
Field targetField = target.getClass().getDeclaredField(field.getName());
targetField.setAccessible(true);
targetField.set(target, value);
} catch (NoSuchFieldException ignored) {}
}
}
}
}删除错误: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement"2025-06-17 14:05:00.014 INFO 6936 --- [nio-8080-exec-3] o.a.c.c.C.[.[localhost].[/KuCun2] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2025-06-17 14:05:00.014 INFO 6936 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2025-06-17 14:05:00.014 DEBUG 6936 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : Detected StandardServletMultipartResolver
2025-06-17 14:05:00.032 DEBUG 6936 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : enableLoggingRequestDetails='false': request parameters and headers will be masked to prevent unsafe logging of potentially sensitive data
2025-06-17 14:05:00.034 INFO 6936 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : Completed initialization in 20 ms
2025-06-17 14:05:00.065 DEBUG 6936 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : POST "/KuCun2/app/delete/bancai", parameters={}
2025-06-17 14:05:00.085 DEBUG 6936 --- [nio-8080-exec-3] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to com.kucun.controller.AppController#deleteEntity(String, Map)
2025-06-17 14:05:00.199 DEBUG 6936 --- [nio-8080-exec-3] m.m.a.RequestResponseBodyMethodProcessor : Read "application/json;charset=UTF-8" to [{id=9}]
2025-06-17 14:05:00.333 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : select bancai0_.id as id1_0_0_, bancai0_.caizhi_id as caizhi_i3_0_0_, bancai0_.houdu as houdu2_0_0_, bancai0_.kucun_id as kucun_id4_0_0_, bancai0_.mupi1_id as mupi5_0_0_, bancai0_.mupi2_id as mupi6_0_0_ from bancai bancai0_ where bancai0_.id=?
Hibernate: select bancai0_.id as id1_0_0_, bancai0_.caizhi_id as caizhi_i3_0_0_, bancai0_.houdu as houdu2_0_0_, bancai0_.kucun_id as kucun_id4_0_0_, bancai0_.mupi1_id as mupi5_0_0_, bancai0_.mupi2_id as mupi6_0_0_ from bancai bancai0_ where bancai0_.id=?
// 获得实体
// 检查库存
2025-06-17 14:05:00.391 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : select count(chanpin_zu0_.id) as col_0_0_ from chanpin_zujian chanpin_zu0_ where chanpin_zu0_.bancai_id=?
Hibernate: select count(chanpin_zu0_.id) as col_0_0_ from chanpin_zujian chanpin_zu0_ where chanpin_zu0_.bancai_id=?
2025-06-17 14:05:00.399 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : select count(dingdan_ch0_.id) as col_0_0_ from dingdan_chanpin_zujian dingdan_ch0_ where dingdan_ch0_.bancai_id=?
Hibernate: select count(dingdan_ch0_.id) as col_0_0_ from dingdan_chanpin_zujian dingdan_ch0_ where dingdan_ch0_.bancai_id=?
2025-06-17 14:05:00.402 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : select count(kucun0_.id) as col_0_0_ from kucun kucun0_ where kucun0_.bancai_id=?
Hibernate: select count(kucun0_.id) as col_0_0_ from kucun kucun0_ where kucun0_.bancai_id=?
2025-06-17 14:05:00.405 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : select count(jinhuo0_.id) as col_0_0_ from jinhuo jinhuo0_ where jinhuo0_.bancai_id=?
Hibernate: select count(jinhuo0_.id) as col_0_0_ from jinhuo jinhuo0_ where jinhuo0_.bancai_id=?
// 检查依赖关系
2025-06-17 14:05:00.429 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : select caizhi0_.id as id1_1_0_, caizhi0_.name as name2_1_0_ from caizhi caizhi0_ where caizhi0_.id=?
Hibernate: select caizhi0_.id as id1_1_0_, caizhi0_.name as name2_1_0_ from caizhi caizhi0_ where caizhi0_.id=?
2025-06-17 14:05:00.448 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : select mupi0_.id as id1_9_0_, mupi0_.name as name2_9_0_, mupi0_.you as you3_9_0_ from mupi mupi0_ where mupi0_.id=?
Hibernate: select mupi0_.id as id1_9_0_, mupi0_.name as name2_9_0_, mupi0_.you as you3_9_0_ from mupi mupi0_ where mupi0_.id=?
2025-06-17 14:05:00.479 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : delete from bancai where id=?
Hibernate: delete from bancai where id=?
2025-06-17 14:05:00.483 DEBUG 6936 --- [nio-8080-exec-3] org.hibernate.SQL : delete from caizhi where id=?
Hibernate: delete from caizhi where id=?
2025-06-17 14:05:00.505 WARN 6936 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 1451, SQLState: 23000
2025-06-17 14:05:00.505 ERROR 6936 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.SqlExceptionHelper : Cannot delete or update a parent row: a foreign key constraint fails (`stock`.`bancai`, CONSTRAINT `FKaqqiwbo1buldyylxfd10t6s9i` FOREIGN KEY (`caizhi_id`) REFERENCES `caizhi` (`id`))
2025-06-17 14:05:00.506 INFO 6936 --- [nio-8080-exec-3] o.h.e.j.b.internal.AbstractBatchImpl : HHH000010: On release of batch it still contained JDBC statements
2025-06-17 14:05:00.565 DEBUG 6936 --- [nio-8080-exec-3] m.m.a.RequestResponseBodyMethodProcessor : Using 'application/json', given [*/*] and supported [application/json, application/*+json, application/json, application/*+json]
2025-06-17 14:05:00.566 DEBUG 6936 --- [nio-8080-exec-3] m.m.a.RequestResponseBodyMethodProcessor : Writing [com.kucun.data.entity.Information@56c5a0dc]
2025-06-17 14:05:00.582 DEBUG 6936 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : Completed 200 OK
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本文介绍了一种在使用SSH框架进行客户信息及关联联系人删除操作时出现的异常情况及其解决方案。异常主要表现为HTTP状态500错误，具体原因是未在hbm.xml文件中正确配置级联删除选项。文章提供了正确的配置示例。
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