java相關：詳解Mybatis中的select方法

發布于 2020-7-3|

復制鏈接

摘記: selectById方法根據id，查詢記錄

```java

public void updateRecycleAssayBusinessItemCharge(String Id) {

AssayBusiness ..

selectById方法根據id，查詢記錄

```java

public void updateRecycleAssayBusinessItemCharge(String Id) {

AssayBusinessItemCharge assayBusinessItemCharge = assayBusinessItemChargeService.selectById(Id);

assayBusinessItemCharge.setRecordStatus(RecordStatusEnum.VALID.getValue());

assayBusinessItemChargeService.update(assayBusinessItemCharge);

}

```

selectByExample方法根據實體字段，查詢記錄

```java

public Account findByAccountName(String accountName) {

AccountExample accountExample = new AccountExample();

AccountExample.Criteria criteria = accountExample.createCriteria();

criteria.andAccountNameEqualTo(accountName);

List accountList = accountService.selectByExample(accountExample);

if (accountList == null || accountList.size() != 1)

return null;

else

return accountList.get(0);

}

```

查詢所有list傳一個空的實體，不要給賦字段值

```java

public Account findByAccountName(String accountName) {

AccountExample accountExample = new AccountExample();

AccountExample.Criteria criteria = accountExample.createCriteria();

List accountList = accountService.selectByExample(accountExample);

if (accountList == null || accountList.size() != 1)

return null;

else

return accountList.get(0);

}

```

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總結

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