SpringBoot2 学习10 集成Mybatis

忘是亡心i 2021-08-20 00:42 421阅读 0赞

# 使用 mybatis generator 自动生成代码 #

参考：  
Mybatis 自动生成代码 mybatis generator  
https://blog.csdn.net/h356363/article/details/90649491

# 项目代码结构 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2gzNTYzNjM_size_16_color_FFFFFF_t_70]

# 配置POM 文件 #

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>SpringBoot2</artifactId>
            <groupId>zz</groupId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>SpringBootMybatis</artifactId>
    
    
        
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            
            <dependency> <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <optional>true</optional>
            </dependency>
    
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.15</version>
            </dependency>
    
            
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.1</version>
            </dependency>
            
        </dependencies>
    
        <repositories>
            <repository>
                <id>alimaven</id>
                <name>aliyun maven</name>
                <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            </repository>
        </repositories>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

# application.properties #

server.port=9018
    server.servlet.context-path=/mybatisdemo
    spring.datasource.url = jdbc:mysql://localhost:3306/java10?useSSL=false&serverTimezone=Asia/Shanghai
    spring.datasource.username = root
    spring.datasource.password = Java20190713*yy
    spring.datasource.driverClassName = com.mysql.cj.jdbc.Driver
    
    mybatis.typeAliasesPackage=org.spring.springboot.domain
    #mybatis.mapperLocations=classpath:com/zz/mapping/*.xml,com/zz/EDGE/mapping/*.xml,com/zz/jwh/mapping/*.xml,com/zz/hc/mapping/*.xml,com/zz/simpleSpade/mapping/*.xml,com/zz/lsw/mapping/*.xml,com/zz/wsq/mapping/*.xml,com/zz/zcj/mapping/*.xml
    mybatis.mapperLocations=classpath:mapping/*.xml

# 启动类配置Mapper路径 #

package com.zz;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.scheduling.annotation.EnableScheduling;
    /**
     * 右键--》run as application  运行正启动类的main方法，就可以启动这个springboot项目。
    SpringBoot 自带了 tomcat， 运行这个main方法 的时候，会同时启动tomcat
     * @author jiyu
     *
     */
    @SpringBootApplication
    @MapperScan("com.zz.mapper")
    public class App {
    
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		SpringApplication.run(App.class, args);
    	}
    
    }

# 测试 #

![在这里插入图片描述][20190904214702342.png]

对应controller

package com.zz.controller;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletRequest;
    
    import com.zz.util.KeyUtil;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.zz.entity.User;
    import com.zz.service.UserService;
    
    @RestController
    @RequestMapping("user")
    public class UserController {
    	@Resource
    	UserService userService;
    	@RequestMapping("add/{name}/{pwd}")
    	public User add(@PathVariable("name") String uname,@PathVariable("pwd") String pwd){
    		User user=new User();
    		user.setPasswd(pwd);
    		user.setUsername(uname);
    		user.setId(KeyUtil.genUniqueKey());
    		userService.add(user);
    		return user;
    	}
    
    
    	@RequestMapping("all")
    	public List<User> getAll(){
    
    		List<User> userlist=new ArrayList<>();
    		return userlist;
    	}
    	
    
    
    }

# 手动添加MyBatis方法，两种方式 #

*  第一种方式： 添加一个xml文件节点和接口方法  
    mapping/UserMapper.xml

<select id="selectAll"  resultMap="BaseResultMap">
        select
        <include refid="Base_Column_List" />
        from t_user
    
      </select>

com.zz.mapper.UserMapper

List<User> selectAll();

*  第二种方式： 只修改接口  
    采用了注解 @Select

@Select("select * from t_user where username=#{name}")
        User selectByName(String name);

接口参考：

package com.zz.mapper;
    
    import com.zz.entity.User;
    import org.apache.ibatis.annotations.Select;
    
    import java.util.List;
    
    public interface UserMapper {
        int deleteByPrimaryKey(String id);
    
        int insert(User record);
    
        int insertSelective(User record);
    
        User selectByPrimaryKey(String id);
    
        List<User> selectAll();
    
        int updateByPrimaryKeySelective(User record);
    
        int updateByPrimaryKey(User record);
        @Select("select * from t_user where username=#{name}")
        User selectByName(String name);
    
        /**
         * @Insert("insert into student(sno,sname,ssex) values(#{sno},#{name},#{sex})")
         * 	int add(Student student);
         *
         *        @Update("update student set sname=#{name},ssex=#{sex} where sno=#{sno}")
         *     int update(Student student);
         *
         *    @Delete("delete from student where sno=#{sno}")
         *     int deleteBysno(String sno);
         *
         *    @Select("select * from student where sno=#{sno}")
         *    @Results(id = "student",value= {
         *         @Result(property = "sno", column = "sno", javaType = String.class),
         *          @Result(property = "name", column = "sname", javaType = String.class),
         *          @Result(property = "sex", column = "ssex", javaType = String.class)
         *    })
         *     Student queryStudentBySno(String sno);
         */
    }

完整源码：

https://gitee.com/bseaworkspace/springboot2all

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2gzNTYzNjM_size_16_color_FFFFFF_t_70]: /images/20210726/833f4f7255fa4def9bef2b4c126cec9a.png
[20190904214702342.png]: /images/20210726/5df14d6505d8491e8d2d973f4eae723b.png