What is the function of junit rollback in springboot

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Junit is used in springboot to write unit tests, and the test results do not affect the database.

Pom introduces dependency

If it is a project generated by IDE, the package has been introduced by default.

Org.springframework.boot spring-boot-starter-test test

Database raw data

raw data

Write unit tests

Package com.mos.quote;import com.mos.quote.model.Area;import com.mos.quote.service.IAreaService;import org.junit.Assert;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.annotation.Rollback;import org.springframework.test.context.junit4.SpringRunner;import org.springframework.transaction.annotation.Transactional;import java.util.List @ RunWith (SpringRunner.class) @ SpringBootTestpublic class QuoteApplicationTests {@ Autowired private IAreaService areaService; @ Testpublic void contextLoads () {} @ Testpublic void testUpdate () {Area area = new Area (); area.setCode ("001003"); area.setName ("Luoyang"); Integer result = areaService.update (area); Assert.assertEquals (1, (long) result);} @ Test @ Transactional @ Rollback public void testUpdate4Rollback () {Area area = new Area () Area.setCode ("001001"); area.setName ("Zhengzhou 123"); Integer result = areaService.update (area); Assert.assertEquals (1, (long) result);}

Result data

Result data

Conclusion

You can see that the data in code=001001 has not changed, while the data in code=001003 has been modified successfully. Look back at the code:

@ Transactional indicates that the method as a whole is a transaction

@ Rollback means that the transaction is rolled back. You can pass a parameter value. By default, true is rolled back, and false does not roll back.

This annotation also supports annotations to the class, which, if so, is valid for the entire class method.

Comment on class

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