What is the role of junit rollback in springboot

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

Pom introduces dependencies

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

<dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-test</artifactid>
      <scope>test</scope>
    </dependency>

Database original data

Original data

Writing unit test

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)
@SpringBootTest
public class QuoteApplicationTests {

  @Autowired
  private IAreaService areaService;

  @Test
  public void contextLoads() {
  }

  @Test
  public void testUpdate(){
    Area area = new Area();
    area.setCode("001003");
    area.setName("洛阳市");
    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("郑州市123");
    Integer result = areaService.update(area);
    Assert.assertEquals(1, (long)result);
  }

}

Result Data

Result data

Conclusion

It can be seen that the data of code=001001 has not changed , and the data with code=001003 was modified successfully. Looking back at the code:

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

@Rollback indicates that the transaction is rolled back after execution. It supports passing in a parameter value, and the default is true. That is, rollback, false does not rollback.

This annotation also supports annotations on classes. If so, it will be effective for the entire class method.

Annotation on class

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