SpringBoot使用JdbcTemplate

Posted 2021-03-23 听风忆雪

 

 1.导入依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

2.创建实体类

public class Grade {

    private Integer gradeId;
    private String gradeName;

    public Grade() {

    }

    public Grade(String gradeName) {
        this.gradeName = gradeName;
    }

    public Grade(Integer gradeId, String gradeName) {
        this.gradeId = gradeId;
        this.gradeName = gradeName;
    }

    public Integer getGradeId() {
        return gradeId;
    }

    public void setGradeId(Integer gradeId) {
        this.gradeId = gradeId;
    }

    public String getGradeName() {
        return gradeName;
    }

    public void setGradeName(String gradeName) {
        this.gradeName = gradeName;
    }
}

3.配置文件

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql:///myschool
    username: root
    password: 123

##更改Tomcat端口
server:
  port: 8081
  ##指定当前工程项目访问地址
  context-path: /jdbc

4.dao层接口

public interface IGradeDao {
    public int insertGrade(Grade grade);
    public int updateGrade(Grade grade);
    public int deleteGrade(Integer id);
    public List<Grade> findAll();

}

5.dao层实现类

@Repository
public class IGradeDaoImpl implements IGradeDao {
    //导入JDBCTemplate模板
    @Resource
    private JdbcTemplate jdbcTemplate;

    @Override
    public int insertGrade(Grade grade) {
        return  jdbcTemplate.update("insert into Grade(GradeName) values(?)",grade.getGradeName());
    }

    @Override
    public int updateGrade(Grade grade) {
        return jdbcTemplate.update("update Grade set GradeName=? where GradeId=?",grade.getGradeName(),grade.getGradeId());
    }

    @Override
    public int deleteGrade(Integer id) {
        return jdbcTemplate.update("delete from Grade where GradeId=?",id);
}

    @Override
    public List<Grade> findAll() {
        //封装行数据映射
        RowMapper<Grade> rowMapper=new RowMapper<Grade>() {
            @Override
            public Grade mapRow(ResultSet rs, int rowNum) throws SQLException {
                Grade grade=new Grade(rs.getInt("GradeId"),rs.getString("GradeName"));
                return grade;
            }
        };
        return jdbcTemplate.query("select * from Grade", rowMapper);
    }
}

6.service层接口

import java.util.List;

public interface IGradeService {
    public int insertGrade(Grade grade);
    public int updateGrade(Grade grade);
    public int deleteGrade(Integer id);
    public List<Grade> findAll();
}

7.servicece层实现类

@Service("iGradeService")
public class IGradeServiceImpl implements IGradeService {
    @Resource
    private IGradeDao iGradeDao;


    @Override
    public int insertGrade(Grade grade) {
        return iGradeDao.insertGrade(grade);
    }

    @Override
    public int updateGrade(Grade grade) {
        return iGradeDao.updateGrade(grade);
    }

    @Override
    public int deleteGrade(Integer id) {
        return iGradeDao.deleteGrade(id);
    }

    @Override
    public List<Grade> findAll() {
        return iGradeDao.findAll();
    }
}

8.controller层

@RestController
public class JDBCTemplateController {
    @Resource
    private IGradeService iGradeService;


    @RequestMapping("/insertGrade")
    public int insertGrade(){
        return iGradeService.insertGrade(new Grade("S1"));
    }
    @RequestMapping("/updateGrade")
    public int updateGrade(){
        return  iGradeService.updateGrade(new Grade(6,"S2"));
    }
    @RequestMapping("/deleteGrade")
    public int deleteGrade(){
        return iGradeService.deleteGrade(6);
    }
    @RequestMapping("/findAll")
    public List<Grade> findAll(){
        return iGradeService.findAll();
    }
}

9.测试类

@SpringBootApplication
public class StartSpringBoot {
    public static void main(String[] args) {
        SpringApplication.run(StartSpringBoot.class,args);
    }
}

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