selectById方法

根据id，查询记录

public void updateRecycleAssayBusinessItemCharge(String Id) { AssayBusinessItemCharge assayBusinessItemCharge = assayBusinessItemChargeService.selectById(Id); assayBusinessItemCharge.setRecordStatus(RecordStatusEnum.VALID.getValue()); assayBusinessItemChargeService.update(assayBusinessItemCharge);}

selectByExample方法

根据实体字段，查询记录

public Account findByAccountName(String accountName) { AccountExample accountExample = new AccountExample(); AccountExample.Criteria criteria = accountExample.createCriteria(); criteria.andAccountNameEqualTo(accountName); List<Account> accountList = accountService.selectByExample(accountExample); if (accountList == null || accountList.size() != 1) return null; else return accountList.get(0);}

查询所有list

传一个空的实体，不要给赋字段值

public Account findByAccountName(String accountName) { AccountExample accountExample = new AccountExample(); AccountExample.Criteria criteria = accountExample.createCriteria(); List<Account> accountList = accountService.selectByExample(accountExample); if (accountList == null || accountList.size() != 1) return null; else return accountList.get(0);}

总结

以上所述是小编给大家介绍的Mybatis中的select方法，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！