详解Mybatis中的select方法

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

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);
}

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);
}