select方法怎么在Mybatis中使用?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
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);
}
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