在Jpa框架下拼接原生sql 并执行的操作
利用jpa的entityManager 执行sql 并执行
其中：
EntityManager.createNativeQuery(SQL)
返回的是Object对象
entityManager.createNativeQuery(SQL,WebInfo.class)
返回的是映射后的实例对象
Query.getSingleResult()执行SQL语句，返回一个查询结果，常用的还有以下方法
Query.getResultList()执行SQL语句，返回一个List集合
Query.getFirstResult()执行SQL语句，返回一个系列结果集合的第一个
直接上例子：
1、EntityManager.createNativeQuery(SQL)返回的是Object对象
entityManager.createNativeQuery(SQL,WebInfo.class)返回的是映射后的实例对象
public List<User> getByCompanyFinanceRoleManager(Long companyID , String authorityName){
StringBuffer querySql = new StringBuffer("select a.* from art_user a , art_user_authority b where a.id = b.user_id and a.company_id = :companyId " +
" and b.authority_name = :authorityName");
Query query = entityManager.createNativeQuery(querySql.toString() , User.class);
query.setParameter("companyId" , companyID);
query.setParameter("authorityName" , authorityName);
List<User> list = query.getResultList();
return list;
}
2、Query.getSingleResult() 执行SQL语句，返回一个查询结果
public Long getByFinanceRoleApplicationCount(ApplicationSearchParamDTO param){
StringBuffer queryCount = new StringBuffer("select count(er.id) from atl_application er , atl_loan_application b where er.application_oid = b.application_oid and er.status not in (1010 ,1011)");
getSql(queryCount , param);
Query count = entityManager.createNativeQuery(queryCount.toString() );
setQueryParam(count , param);
Object obj = count.getSingleResult();
Long countNum = ((BigInteger) obj).longValue();
return countNum;
}
public void getSql(StringBuffer querySql , ApplicationSearchParamDTO param ){
//公司oid
if (!StringUtils.isEmpty(param.getCompanyOID())) {
querySql.append(" and er.company_oid = :companyOID ");
}
//申请人oid
if (CollectionUtils.isNotEmpty(param.getApplicantOIDs())){
querySql.append(" and er.applicant_oid in ( :applicantOID ) ");
}
if (!StringUtils.isEmpty(param.getBusinessCode())){
querySql.append(" and b.business_code like CONCAT('%' , :businessCode , '%') ");
}
if (CollectionUtils.isNotEmpty(param.getDepartmentOIDs()) && CollectionUtils.isNotEmpty(param.getFinanceRoleCorporationOids()) && CollectionUtils.isEmpty(param.getCorporationOIDs())) {
querySql.append(" and ( b.department_oid in ( :departmentOID ) or er.corporation_oid in ( :corporationOID ) OR b.department_oid is null OR er.corporation_oid is null )");
}else if(CollectionUtils.isNotEmpty(param.getDepartmentOIDs()) && CollectionUtils.isEmpty(param.getCorporationOIDs())){
querySql.append(" and ( b.department_oid in ( :departmentOID ) OR b.department_oid is null ) ");
}else if(CollectionUtils.isNotEmpty(param.getFinanceRoleCorporationOids()) && CollectionUtils.isEmpty(param.getCorporationOIDs())){
querySql.append(" and ( er.corporation_oid in ( :corporationOID ) OR er.corporation_oid is null ) ");
}
if (CollectionUtils.isNotEmpty(param.getCorporationOIDs())){
querySql.append(" and er.corporation_oid in ( :corporationOID ) ");
}
//开始时间
if (param.getStartDate() != null) {
querySql.append(" and er.last_modified_date >= :startDate ");
}
//结束时间
if (param.getEndDate() != null) {
querySql.append(" and er.last_modified_date <= :endDate ");
}
//单据类型
if (CollectionUtils.isNotEmpty(param.getType())) {
querySql.append(" and er.type in ( :type ) ");
}
//单据状态
if (CollectionUtils.isNotEmpty(param.getStatus())) {
querySql.append(" and er.status in ( :status )");
}
/* //申请单oid
if (CollectionUtils.isNotEmpty(param.getApplicationOIDs())) {
querySql.append(" and er.application_oid in ( :applicationOID )");
}*/
//反选
if(CollectionUtils.isNotEmpty(param.getExcludedApplicationOIDs())){
querySql.append(" and er.application_oid not in ( :excludedApplicationOID )");
}
}
3、Query.getResultList()
public List<DepartmentDTO> getDepartmentsOfReportLine(UUID reportLineOID) {
String sql = "SELECT d.department_oid, d.`name` FROM art_department d INNER JOIN art_report_obj ro on ro.obj_oid = d.department_oid AND ro.obj_type = '2' "
+ "and ro.report_line_oid = '" + reportLineOID + "'";
Query query = entityManager.createNativeQuery(sql);
List<DepartmentDTO> list = new ArrayList<>();
List<Object[]> rtList = query.getResultList();
for (Object[] objects : rtList) {
DepartmentDTO departmentDTO = new DepartmentDTO();
departmentDTO.setDepartmentOID(UUID.fromString(objects[0].toString()));
departmentDTO.setName(objects[1].toString());
list.add(departmentDTO);
}
return list;
}
```
直接参考例子，拼接正确sql 即可。
Springboot JPA执行原生SQL，自定义SQL占位符增加参数
JPA 实际上就是 Hibernate 的封装，根据Interface 方法名，生成对应的方法，也支持Query注解的方式和原生SQL，原生SQL如下：
1、注解@Query方式执行原生SQL语句：
@Query(value = "select * from table_car_mark limit 0,10",nativeQuery = true)
List<CarsMark> findTop10();
注解的方式需要增加一个“nativeQuery=true”来表示是原生 SQL
2、EntityManager.Query 方式：
String sql = "insert t_car_mark_v2(id,car_mark,trigger_event,operate_state,gps_time,gps_longtitude,gps_latitude,gps_speed,gps_direction,gps_state) VALUES(1379000,204819,4,1,20121101012203,116.4130173,39.8860664,0,0,1),(1378501,162481,4,0,20121101012202,116.3074417,39.8848457,54,240,1)";
Query query = em.createNativeQuery(sql);
3、复杂原生SQL，占位式：
...
import javax.persistence.EntityManager;
import javax.persistence.Query;
....
@Autowired
private EntityManager em;
String sql = "insert t_car_mark_v2(id,car_mark,trigger_event,operate_state,gps_time,gps_longtitude,gps_latitude,gps_speed,gps_direction,gps_state) values(?,?,?,?,?,?,?,?,?)";
query = em.createNativeQuery(sql);
query.setParameter(1,1);
query.setParameter(2,'values');
query.setParameter(3,1);
query.setParameter(4,1);
query.setParameter(5,'values');
query.setParameter(6,'values');
query.setParameter(7,'values');
query.setParameter(8,'values');
query.setParameter(9,'values');
query.executeUpdate();
使用 query.setParameter(index,parms);方式对“?”进行参数占位补充。
Note：
返回值：由于是一个insert操作，另外成功则返回操作的条数，没有做数据改变则返回 0 。
如果出现 “jpa Executing an update/delete query ”异常，那么是因为你没有添加事物和“@Modifying”比较，把注解加上就可以。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持无名。