idea2023 springboot2.7.5+mybatisplus3.5.2+jsp 初学单表增删改查

创建项目

修改pom.xml 为2.7.5
引入mybatisplus
2.1 修改pom.xml

<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.5.2</version></dependency><!--mysql驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.29</version></dependency><!--C标签库得使用--><dependency><groupId>jstl</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!--如下是为了配置，可以正常访问jsp--><dependency><groupId>org.apache.tomcat.embed</groupId><artifactId>tomcat-embed-jasper</artifactId></dependency>

2.2 修改application.properties 如下内容：

server.port=8081
spring.datasource.url=jdbc:mysql://localhost:3306/jdbc08
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
mybatis.mapper-locations=classpath:mapper/*.xml

2.3src下的实体类
配置表名
配置主键

@Data
@TableName("tb_dept")
public class DeptBean implements Serializable {@TableId(value = "did", type = IdType.ASSIGN_ID)private int did;private String dname;}

2.4 src下的mapper

@Mapper
public interface DeptMapper extends BaseMapper<DeptBean> {}

2.5 src下的service

@Service
public class DeptService {@Autowiredprivate DeptMapper deptMapper;public void addDeptService(DeptBean name){deptMapper.insert(name);}public void delDeptService(int did){deptMapper.deleteById(did);}public void updateDeptService(DeptBean deptBean){deptMapper.updateById(deptBean);}public DeptBean byidDeptService(int did){return deptMapper.selectById(did);}public List<DeptBean> allDeptService(){return deptMapper.selectList(null);}}

2.6 src下的controller

@Controller
public class DeptController {@Autowiredprivate DeptService deptService;@RequestMapping("addDept")public String addDept(DeptBean dname){deptService.addDeptService(dname);return "allDept";}@RequestMapping("allDept")public String allDept(Model model){model.addAttribute("alldept",deptService.allDeptService());return "deptAll.jsp";}@RequestMapping("byidDept")public String byidDept(int id ,Model model){System.out.println(id);model.addAttribute("byidDept",deptService.byidDeptService(id));return "deptUpdate.jsp";}@RequestMapping("delDept")public String delDept(int id){deptService.delDeptService(id);return "allDept";}@RequestMapping("updateDept")public String updateDept(DeptBean deptBean){deptService.updateDeptService(deptBean);return "allDept";}
}