jpa使用方法的几种归类
见结算项目
用jpa的都是单实体，如果需要复杂bo查询需要再dao上嫁接一个接口，其实现类用jdmctemlpate,或mybatis（用的时候还是用主的dao接口）
jpa使用大致分二种：（都是基于单个实体的），此二者都有自带分页的参数方法
1，继承JpaRepository的dao可以用@query注解 也可根据名字判别查询
2，继承JpaSpecificationExecutor实现复杂条件（有为空情况下的查询），自动有传入分页信息的接口（不必再PagingAndSortingRepository）
另：如果需要查询bo复杂bo需要再dao上嫁接一个接口，其实现类用jdmctemlpate,或mybatis（用的时候还是用主的dao接口）
1根据名称判别 实体（这种没有继承任何的是为了查询bo的嫁接接口）
public interface ISettFundRepository {
public Page<TbSettFundVo> findAll(FundQueryVo vo);
}
2@Query 只有继承了JpaRepository才有@query（）才有根据名字查询特性
2.1 实体
public interface SettFundRepository extends JpaRepository<TbSettFund, TbSettFundPK>,ISettFundRepository{
/**
* 根据类型查询单个账户 用于查询清收、利息、手续费子账户
* 手续费子账户 3
* 利息子账户 4
* 清收子账户 5
* @param custType
* @return
*/
public TbSettFund findFirstByCustType(int custType);
@Query("select t from TbSettFund t where t.id.custAcctId=?1")
public TbSettFund findByCustAcctId(String custAcctId);
}
bo
///对于有bo查询就不能用jpa了，方式1，用模版中的query,需用其他结合如jdbctemplate ，看项目中封装的PageQuery.java，此时和jpa无关，嫁接到其上而已
public class SettFundRepositoryImpl implements ISettFundRepository {
@Autowired
private PageQuery pageQuery;
@Override
public Page<TbSettFundVo> findAll(FundQueryVo vo) {
StringBuilder sb = new StringBuilder("select b.cust_name,a.* from tb_sett_fund a ,tb_sett_account b where a.cust_acct_id=b.cust_acct_id");
if (!StringUtils.isEmpty(vo.getThirdCustId())){
sb.append(" and a.third_cust_id like '%"+vo.getThirdCustId()+"%'");
}
if (!StringUtils.isEmpty(vo.getCustName())){
sb.append(" and b.cust_name like '%"+vo.getCustName()+"%'");
}
sb.append(" order by a.tran_date desc");
return pageQuery.query(sb.toString(), vo, TbSettFundVo.class);
}
}
///druid分页
private String pageSql(String sql,Pageable pageable){
return PagerUtils.limit(sql, JdbcConstants.ORACLE, pageable.getOffset(), pageable.getPageSize());
//StringBuilder sb = new StringBuilder("SELECT * FROM (SELECT row_.*, ROWNUM rownum_ FROM (");
//sb.append(sql);
//sb.append(") row_ where rownum <= ");
//sb.append(pageable.getOffset()+pageable.getPageSize());
//sb.append(") WHERE rownum_ > ");
//sb.append(pageable.getOffset());
//
//return sb.toString();
}
public <T> Page<T> query(String sql,BaseQueryVo vo,Class<T> voType) {
logger.info(sql);
Pageable pageable = vo.getPageable();
long total = count(sql);
List<T> list = jdbcTemplate.query(pageSql(sql, pageable), getMapper(voType));//////pageSql通过自己写的这个工具类分页（其实也是druid的）
Page<T> page = new PageImpl<T>(list, pageable, total);
//返回页数超出总页数 则取最后一页的数据
if (pageable.getOffset()>page.getTotalElements()){
PageRequest newPageable = new PageRequest(page.getTotalPages()-1,pageable.getPageSize());
list = jdbcTemplate.query(pageSql(sql, newPageable), getMapper(voType));
page = new PageImpl<T>(list, newPageable, total);
}
return page;
}
////返回bo的方式2，模版中query中的用rowmapper
@SuppressWarnings("unchecked")
@Override
public List<TbSettInmoney> selectInmoney(TbSettInmoney entity) {
// TODO Auto-generated method stub
// String str= "2017-04-07 00:00:00";
SimpleDateFormat SFDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String strb=SFDate.format(entity.getBeginDate());//entity.getTranDate();
String stre=SFDate.format(entity.getEndDate());//entity.getTranDate();
List<TbSettInmoney> tb= jdbcTemplate.query("select * from TB_SETT_INMONEY t where t.acct_date>=to_date (? , 'YYYY-MM-DD HH24:MI:SS' ) and t.acct_date<=to_date (? , 'YYYY-MM-DD HH24:MI:SS' )", new Object[]{strb,stre},new RowMapper(){
@Override
public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
// TODO Auto-generated method stub
TbSettInmoney tb= new TbSettInmoney();
tb.setInId(rs.getLong("IN_ID"));
tb.setCcyCode(rs.getString("CCY_CODE"));
tb.setCounterId(rs.getString("COUNTER_ID"));
tb.setSupAcctId(rs.getString("SUP_ACCT_ID"));
tb.setInAcctId(rs.getString("IN_ACCT_ID"));
tb.setInAcctIdName(rs.getString("IN_ACCT_ID_NAME"));
tb.setLogNo(rs.getString("LOG_NO"));
tb.setTranStatus(rs.getInt("TRAN_STATUS"));
// tb.setCustFlag(rs.getInt("CUST_FLAG"));
// tb.setTranDate(rs.getDate("TRAN_DATE"));
return tb;
}
});
System.out.println(tb.size());
return tb;
}
2.2
public interface SettPlatInfoRepository extends JpaRepository<TbSettPlatInfo, Long> {
@Query("select t from TbSettPlatInfo t where t.infoId=(select max(s.infoId) from TbSettPlatInfo s)")
public List<TbSettPlatInfo> findTbSettPlatInfo();
}
3 复杂查询 JpaSpecificationExecutor 实体（只有继承了JpaSpecificationExecutor才有Specification方法）
public interface SettAccountRepository extends JpaRepository<TbSettAccount, TbSettAccountPK>,JpaSpecificationExecutor<TbSettAccount> {
@Query("select t from TbSettAccount t where t.id.custAcctId=?1")
public TbSettAccount findByCustAcctId(String custAcctId);
@Query("select t from TbSettAccount t where t.id.thirdCustId=?1")
public TbSettAccount findByThirdCustId(String thirdCustId);
@Query(value="select u.customer_key from tb_cus_firm u where u.customer_id=?1",nativeQuery=true)
public Long thirdIdSize(String thirdCustId);
/**
* 根据customer_key获得组织机构代码证
* @param customerKey
* @return
*/
@Query(value="select u.papers_num from tb_cus_firm_affix_chg u where u.customer_key=?1 and u.affix_kind='E'",nativeQuery=true)
public String getOrgCode(long customerKey);
}
@RequestMapping("accountList1")
@ResponseBody
public Page<TbSettAccount> findAll(){
Page<TbSettAccount> pages = null;
Pageable page = new PageRequest(0,10);
pages = settAccountService.findAll(page);
List<TbSettAccount> list = pages.getContent();///////////spring的自带分页
return pages;
}
@Override
public Page<TbSettAccount> findAll(Pageable pageable) {
Specification<TbSettAccount> spec = new Specification<TbSettAccount>(){
@Override
public Predicate toPredicate(Root<TbSettAccount> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
Expression<String> custId = root.get("id").get("thirdCustId").as(String.class);
List<Predicate> list = new ArrayList<Predicate>();
Predicate p = cb.equal(custId, "E00000062");
list.add(p);
Predicate p1 = cb.equal(root.get("idCode").as(String.class), "12343011-9");
// list.add(p1);
Predicate[] predicates = new Predicate[list.size()];
// return query.where(list.toArray(predicates)).getRestriction();
return null;
}};
Page<TbSettAccount> page = settAccountRepository.findAll(spec, pageable);
// Page<TbSettAccount> page = settAccountRepository.findAll(pageable);
List<TbSettAccount> list = page.getContent();
for (TbSettAccount account:list){
account.setFund(settFundService.findByCustAcctId(account.getId().getCustAcctId()));
}
return page;
}
参考：
http://www.cnblogs.com/jiangxiaoyaoblog/p/5635152.html
http://blog.****.net/lsk12162012/article/details/50442792