SpringBoot01

Spring+Mybatis+MP

使用SpringBoot实现增删改查

1.编写pom文件

  <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.6.3</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.6.3</version>
            <scope>test</scope>
        </dependency>

        <!--简化代码的工具包-->
        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
            <scope>provided</scope>
        </dependency>
        <!--mybatis-plus的springboot支持-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.29</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.4</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.3.15</version>

        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.6.4</version>
            </plugin>
        </plugins>
    </build>

2.编写mapper接口

public interface StudentMapper extends BaseMapper<Student> {
}

3.编写实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
@TableName("students")//表名
public class Student {
    @TableId(type = IdType.AUTO)//告诉下面的字段为id
    private String stuNum;
    private String stuName;
    private String stuGender;
    private int stuAge;
}

4.编写application.properties文件

spring.application.name = springboot-mybatis
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?serverTimezone=GMT%2b8
spring.datasource.username=root
spring.datasource.password=297999

5.编写or4j.peoperties文件

log4j.rootLogger=DEBUG,A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=[%t] [%c]-[%p] %m%n

6.编写测试文件

@RunWith(SpringRunner.class)
@SpringBootTest
public class StudentTest {
    @Autowired
    StudentMapper mapper;
    @Test
    public void testSelect(){
        List<Student> students = mapper.selectList(null);
        for (Student student:students) {
            System.out.println(student);
        }
    }

}

6.测试结果

7.测试其他增删改查
7.1.1 查询单个用户

    @Test
//查询一个学生信息
    public void testOneSelect(){
        Student student = mapper.selectById(2021001);
        System.out.println(student);
    }

7.1.2测试结果

7.2.1 添加用户

    @Test
//添加一个学生信息
    public void testInsert(){
        mapper.insert(new Student("2021005", "文文", "女", 18));
    }

7.2.2测试结果

7.3.1测试修改用户信息

 @Test
//修改学生信息
    public void testUpdate(){
        QueryWrapper<Student> studentQueryWrapper = new QueryWrapper<Student>();
        studentQueryWrapper.eq("stu_num","2021005");
        mapper.update(new Student("2021005","文文","女",21),studentQueryWrapper);
    }

7.3.2测试结果

7.4.1 测试删除用户信息

    @Test
//删除学生信息
    public void testDelect() {
        QueryWrapper<Student> studentQueryWrapper = new QueryWrapper<Student>();
        studentQueryWrapper.eq("stu_num","2021005");
        mapper.delete(studentQueryWrapper);
    }