idea+springboot+mybatis整合及注意

你的名字 2022-05-17 00:24 256阅读 0赞

1：首先pom.xml导入jdbc和mybatis和druid相关依赖

<dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.44</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.31</version>
    </dependency>
    
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.1.1</version>

2：application.yml中加入

spring:
        datasource:
              driver-class-name: com.mysql.jdbc.Driver
              url: jdbc:mysql://localhost:3306/database?useUnicode\=true&characterEncoding\=UTF-8
              username: root
              password: root
              type: com.alibaba.druid.pool.DruidDataSource
              filters: stat
              maxActive: 20
              initialSize: 1
              maxWait: 60000
              minIdle: 1
              timeBetweenEvictionRunsMillis: 60000
              minEvictableIdleTimeMillis: 300000
              validationQuery: select 'x'
              testWhileIdle: true
              testOnBorrow: false
              testOnReturn: false
              poolPreparedStatements: true
              maxOpenPreparedStatements: 20

如果你是application.properties也是一样的，直接把冒号改成.就行，如：

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.url=jdbc:mysql://localhost:3306/database?useUnicode\\=true&characterEncoding\\=UTF-8

..............................................

依次如下

以下皆为案例演示，通过案例了解。

先贴User

package com.nework.course01.domain;
    import io.swagger.annotations.ApiModel;
    import io.swagger.annotations.ApiModelProperty;
    
    import java.util.Date;
    
    
    public class User {
     
        private String uuid;
      
        private String username;
       
        private String password;
      
        private String isRoot;
     
        private Date registerDate;
     
        private Integer status;
    
        public User() {
        }
    
        public User(String uuid, String username, String password) {
            this.uuid = uuid;
            this.username = username;
            this.password = password;
        }
    
        public String getUuid() {
            return uuid;
        }
    
        public void setUuid(String uuid) {
            this.uuid = uuid;
        }
    
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
    
        public String getIsRoot() {
            return isRoot;
        }
    
        public void setIsRoot(String isRoot) {
            this.isRoot = isRoot;
        }
    
        public Date getRegisterDate() {
            return registerDate;
        }
    
        public void setRegisterDate(Date registerDate) {
            this.registerDate = registerDate;
        }
    
        public Integer getStatus() {
            return status;
        }
    
        public void setStatus(Integer status) {
            this.status = status;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "uuid='" + uuid + '\'' +
                    ", username='" + username + '\'' +
                    ", password='" + password + '\'' +
                    ", isRoot='" + isRoot + '\'' +
                    ", registerDate=" + registerDate +
                    ", status=" + status +
                    '}';
        }
    }

3：以UserMapper为例

package com.nework.course01.mapper;
    
    import com.nework.course01.domain.User;
    import org.apache.ibatis.annotations.*;
    import org.springframework.stereotype.Component;
    
    import java.util.List;
    
    @Mapper
    @Component(value ="userMapper")
    public interface UserMapper {
    
        @Select("select * from user where username=#{username}")
            //@Result 修饰返回的结果集，关联实体类属性和数据库字段一一对应，如果实体类属性和数据库属性名保持一致，就不需要这个属性来修饰。
        User findUserByUsername(@Param("username")String username);
    
        @Select("select * from user where username=#{username} and password=#{password}")
        User findUserByUsernameAndPassword(@Param("username")String username,@Param("password")String password);
    
        @Select("select * from user")
        @Results({
                @Result(property = "uuid",  column = "uuid", javaType = String.class),
                @Result(property = "username", column = "username",javaType = String.class),
                @Result(property = "password", column = "password",javaType = String.class),
                @Result(property = "isRoot", column = "isRoot",javaType = String.class),
                @Result(property = "registerDate", column = "registerDate",javaType = java.util.Date.class),
                @Result(property = "status", column = "status",javaType = Integer.class),
        })
        List<User> findAllUser();
    
        @Insert("insert into user(uuid,username,password,isRoot,registerDate,status) " +
                " values(#{uuid}, #{username}, #{password},#{isRoot},#{registerDate},#{status})")
        void saveUser(@Param("user")User user);
    
        @Delete("delete from user where uuid =#{uuid}")
        void deleteUserByUUID(@Param("uuid")String uuid);
    
        @Update("update user set password=#{password},status=#{status} where uuid=#{uuid}")
        void updateUser(@Param("user")User user);
    }

注意：这里UserMapper里的方法需要用@Param("形参名")进行修饰，不然会报错，如下：

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.BindingException: Parameter 'username' not found. Available parameters are [1, 0, param1, param2]

4：以UserService 为例

package com.nework.course01.service;
    
    import com.nework.course01.domain.User;
    
    import java.util.List;
    
    public interface UserService {
        User findUserByUsername(String username);
        User findUserByUsernameAndPassword(String username,String Password);
        List<User> findAllUser();
        String saveUser(User user);
        void deleteUserByUUID(String uuid);
        void updateUser(User user);
    }

5：以UserServiceImpl 为例

package com.nework.course01.service.impl;
    
    import com.nework.course01.domain.User;
    import com.nework.course01.mapper.UserMapper;
    import com.nework.course01.service.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    
    import java.util.List;
    
    @Service("userService")
    public class UserServiceImpl implements UserService {
    
        @Autowired
        private UserMapper userMapper;
    
        @Transactional(readOnly = true)
        @Override
        public User findUserByUsername(String username) {
            return userMapper.findUserByUsername(username);
        }
    
        @Override
        public User findUserByUsernameAndPassword(String username, String Password) {
            return userMapper.findUserByUsernameAndPassword(username,Password);
        }
    
        @Transactional(readOnly = true)
        @Override
        public List<User> findAllUser() {
            return userMapper.findAllUser();
        }
    
        @Transactional
        @Override
        public String saveUser(User user) {
            userMapper.saveUser(user);
            return user.getUuid();
        }
    
        @Transactional
        @Override
        public void deleteUserByUUID(String uuid) {
            userMapper.deleteUserByUUID(uuid);
        }
    
        @Transactional
        @Override
        public void updateUser(User user) {
            userMapper.updateUser(user);
        }
    }

6：以SystemController 为例

package com.nework.course01.controller;
    
    
    import com.nework.course01.domain.User;
    import com.nework.course01.service.UserService;
    import com.nework.course01.util.JsonResult;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.*;
    
    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @Controller
    @RequestMapping("/system")
    public class SystemController {
    
        Logger logger = LoggerFactory.getLogger(getClass());
    
        @Resource(name = "userService")
        UserService userService;
    
        @GetMapping("/login")
        @ResponseBody
        public String login( @RequestParam String username, @RequestParam String password){
          User user= userService.findUserByUsernameAndPassword(username,password);
           logger.info("{}",user);
        }

@GetMapping("/add")
     @ResponseBody
    public void addUser() {
        User user = new User();
        user.setStatus(1);
        user.setUuid(UUID.randomUUID().toString().replace("-", ""));
        user.setRegisterDate(new Date());
        user.setPassword("123456");
        user.setIsRoot("0");
        user.setUsername("haha");
        String uuid = userService.saveUser(user);
        logger.info("增加成功：uuid：{}", uuid);
     }
    
    }

这样基本就配置完成了，当然还有复杂的sql语句需要拼接，注解模式是难以操作的，该怎么做呢，等下次更新，谢谢。