MyBatis - 使用示例（三）整合SpringBoot

谁借莪１个温暖的怀抱￠ 2023-01-02 02:25 170阅读 0赞

# MyBatis - 使用示例（三）整合SpringBoot #

> 前面两篇文章简单的示意了下直接使用MyBatis和整合Spring下使用。本文讲一下如何整合SpringBoot。

## 一、MyBatis集成SpringBoot使用 ##

## （一）工程结构图 ##

先看下我工程的结构吧，如果不熟悉SpringBoot的的可以按照我这个敲一遍

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1phY2tfdHpo_size_16_color_FFFFFF_t_70_pic_center]

## （二）引入依赖 ##

<?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">
        <groupId>org.example</groupId>
        <artifactId>mubatis-springboot-demo</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>pom</packaging>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.3.RELEASE</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>mubatis-springboot-demp</artifactId>
    
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
        </properties>
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.apache.logging.log4j</groupId>
                    <artifactId>log4j-bom</artifactId>
                    <version>2.13.3</version>
                    <scope>import</scope>
                    <type>pom</type>
                </dependency>
            </dependencies>
        </dependencyManagement>
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
                <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-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.16.22</version>
                <scope>provided</scope>
            </dependency>
            
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>2.1.4</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.20</version>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid-spring-boot-starter</artifactId>
                <version>1.2.3</version>
            </dependency>
            
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper-spring-boot-starter</artifactId>
                <version>1.3.0</version>
            </dependency>
            
            
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-core</artifactId>
            </dependency>
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-api</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-web</artifactId>
            </dependency>
            <dependency> 
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-slf4j-impl</artifactId>
            </dependency>
            <dependency> 
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-1.2-api</artifactId>
            </dependency>
            <dependency> 
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-jcl</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.7</version>
            </dependency>
            
            <dependency>
                <groupId>com.lmax</groupId>
                <artifactId>disruptor</artifactId>
                <version>3.4.2</version>
            </dependency>
            
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.73</version>
            </dependency>
        </dependencies>
    
    </project>

## （三）添加mybatis-config.xml ##

这个文件是配置mybatis的一些东西，其实也可以不用的。

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
        
        
        <settings>
            
            <setting name="cacheEnabled" value="true"/>
            
            <setting name="localCacheScope" value="STATEMENT"/>
            
            
            <setting name="lazyLoadingEnabled" value="true"/>
            
            
            <setting name="aggressiveLazyLoading" value="false"/>
            
            <setting name="useColumnLabel" value="true"/>
            
            <setting name="useGeneratedKeys" value="false"/>
            
            <setting name="mapUnderscoreToCamelCase" value="true"/>
        </settings>
    </configuration>

## （四）添加application.yml ##

server:
      port: 8123
      servlet:
        context-path: /mybatis-springboot-demo
      tomcat:
        accept-count: 200
        min-spare-threads: 200
    spring:
      application:
        name: mybatis-springboot-demo
      profiles:
        active: test
      servlet:
        multipart:
          max-file-size: 100MB
          max-request-size: 100MB
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        druid:
          url: jdbc:mysql://192.168.2.2:3306/mybatis
          username: root
          password: root
          driver-class-name: com.mysql.cj.jdbc.Driver # 不配置则会根据 url 自动识别
          initial-size: 5 # 初始化时建立物理连接的个数
          min-idle: 20 # 最小连接池数量
          max-active: 20 # 最大连接池数量
          max-wait: 10000 # 获取连接时最大等待时间，单位毫秒
          validation-query: SELECT 1 # 用来检测连接是否有效的 sql
          test-while-idle: true # 申请连接的时候检测，如果空闲时间大于 timeBetweenEvictionRunsMillis，则执行 validationQuery 检测连接是否有效
          test-on-borrow: false # 申请连接时执行 validationQuery 检测连接是否有效
          min-evictable-idle-time-millis: 120000 # 连接保持空闲而不被驱逐的最小时间，单位是毫秒
          time-between-eviction-runs-millis: 3600000 # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
          filters: stat,log4j,wall # 配置过滤器，stat-监控统计，log4j-日志，wall-防御 SQL 注入
          connection-properties: 'druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000' # StatFilter配置，打开合并 SQL 功能和慢 SQL 记录
          web-stat-filter: # WebStatFilter 配置
            enabled: true
            url-pattern: '/*'
            exclusions: '*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*'
          stat-view-servlet: # StatViewServlet 配置
            enabled: true
            url-pattern: '/druid/*'
            reset-enable: false
            login-username: druid
            login-password: druid
          aop-patterns: 'com.fullmoon.study.service.*' # Spring 监控配置
    mybatis:
      type-aliases-package: cn.tzh.mybatis.entity
      mapper-locations: classpath:cn/tzh/mybatis/mapper/*.xml
      config-location: classpath:mybatis-config.xml
    pagehelper:
      helper-dialect: mysql
      reasonable: true # 分页合理化参数
      offset-as-page-num: true # 将 RowBounds 中的 offset 参数当成 pageNum 使用
      supportMethodsArguments: true # 支持通过 Mapper 接口参数来传递分页参数

## （五）添加log4j2.xml ##

<?xml version="1.0" encoding="UTF-8"?>
    <configuration status="INFO" monitorInterval="30">
        <appenders>
            
            
            <Console name="Console" target="SYSTEM_OUT">
                
                <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
                
                <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"/>
            </Console>
            
            <RollingFile name="RollingFile" fileName="logs/trace.log" append="true" filePattern="logs/$${date:yyyy-MM}/trace-%d{yyyy-MM-dd}-%i.log.gz">
                
                <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
                
                <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"/>
                <Policies>
                    <TimeBasedTriggeringPolicy/>
                    <SizeBasedTriggeringPolicy size="100 MB"/>
                </Policies>
            </RollingFile>
            
            <RollingFile name="RollingErrorFile" fileName="logs/error.log" append="true" filePattern="logs/$${date:yyyy-MM}/error-%d{yyyy-MM-dd}-%i.log.gz">
                
                <ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/>
                
                <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"/>
                <Policies>
                    <TimeBasedTriggeringPolicy/>
                    <SizeBasedTriggeringPolicy size="100 MB"/>
                </Policies>
            </RollingFile>
        </appenders>
        <loggers>
            
            <logger name="org.springframework" level="INFO"/>
            <logger name="org.mybatis" level="INFO"/>
            <root level="INFO" includeLocation="true">
                <appender-ref ref="Console"/>
                <appender-ref ref="RollingFile"/>
                <appender-ref ref="RollingErrorFile"/>
            </root>
        </loggers>
    </configuration>

## （六）创建UserMapper和映射mapper.xml ##

package cn.tzh.mybatis.mapper;
    
    import cn.tzh.mybatis.entity.User;
    import org.apache.ibatis.annotations.Mapper;
    import org.apache.ibatis.annotations.Param;
    
    /** * @author tzh * @date 2020/12/28 14:29 */
    @Mapper
    public interface UserMapper { 
    
        /** * 查询用户 * * @param id id * @return {@link User} * @author tzh * @date 2020/12/30 */
        User selectUser(@Param("id") Long id);
    }

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    
    
    <mapper namespace="cn.tzh.mybatis.mapper.UserMapper">
        
        <cache/>
        
        <select id="selectUser" resultType="User">
            select *
            from user
            where id = #{id}
        </select>
    </mapper>

## （七）创建service层、controller层、User实体 ##

package cn.tzh.mybatis.entity;
    
    import lombok.Data;
    
    import java.io.Serializable;
    
    /** * @author tzh * @date 2020/12/28 14:32 */
    @Data
    public class User implements Serializable { 
    
        private static final long serialVersionUID = 2296136623557481394L;
        private Long id;
        private String userName;
        private Integer age;
        private String phone;
        private String desc;
    }

package cn.tzh.mybatis.service;
    
    import cn.tzh.mybatis.entity.User;
    
    /** * @author tzh * @date 2020/12/31 11:42 */
    public interface UserService { 
    
        /** * 根据用户id查询用户详情 * * @param id 用户id * @return {@link User} * @author tzh * @date 2020/12/31 */
        User selectUser(Long id);
    }

package cn.tzh.mybatis.service.impl;
    
    import cn.tzh.mybatis.entity.User;
    import cn.tzh.mybatis.mapper.UserMapper;
    import cn.tzh.mybatis.service.UserService;
    import org.springframework.stereotype.Service;
    
    import javax.annotation.Resource;
    
    /** * @author tzh * @date 2020/12/31 11:44 */
    @Service
    public class UserServiceImpl implements UserService { 
    
        @Resource
        private UserMapper userMapper;
    
    
        @Override
        public User selectUser(Long id) { 
            return userMapper.selectUser(id);
        }
    }

package cn.tzh.mybatis.controller;
    
    import cn.tzh.mybatis.entity.User;
    import cn.tzh.mybatis.service.UserService;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.annotation.Resource;
    
    /** * @author tzh * @date 2020/12/31 11:39 */
    @RestController
    @RequestMapping("/user")
    public class UserController { 
    
        @Resource
        private UserService userService;
    
        @GetMapping("/getUser")
        public User getUser(Long id) { 
            return userService.selectUser(id);
        }
    }

## （八）创建启动类 ##

package cn.tzh.mybatis;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.transaction.annotation.EnableTransactionManagement;
    
    /** * @author tzh * @date 2020/12/31 15:51 */
    @SpringBootApplication
    @EnableTransactionManagement
    @MapperScan("cn.tzh.mybatis.mapper")
    public class Application { 
        public static void main(String[] args) { 
            SpringApplication.run(Application.class, args);
        }
    }

## （九）启动项目 ##

用postman调用 发现没问题

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1phY2tfdHpo_size_16_color_FFFFFF_t_70_pic_center 1]

\--------------最后感谢大家的阅读，愿大家技术越来越流弊！--------------

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1phY2tfdHpo_size_16_color_FFFFFF_t_70]

\--------------也希望大家给我点支持，谢谢各位大佬了！！！--------------

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