SpringBoot整合MyBatis

  由于公司项目微服务采用的springBoot框架，感觉这玩意在了解之后着实好用。本文将分为三个步骤构建一个SpringBoot整合Mybatis的小项目。

---

1.配置依赖

    <dependencies>
         <dependency>
             <groupId>org.springframework.bootgroupId>
              <artifactId>spring-boot-starter-webartifactId>
             dependency>

        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <scope>runtimescope>
        dependency>
        
        <dependency>
            <groupId>org.mybatis.spring.bootgroupId>
            <artifactId>mybatis-spring-boot-starterartifactId>
            <version>1.1.1version>
        dependency>

        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druidartifactId>
            <version>1.0.18version>
        dependency>
        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>fastjsonartifactId>
            <version>1.1.43version>
        dependency>
        
        <dependency>
            <groupId>com.mangofactorygroupId>
            <artifactId>swagger-springmvcartifactId>
            <version>0.9.5version>
        dependency>
    dependencies>

本文采用的阿里的druid数据源，大家如果不想引用可以使用默认的数据源org.apache.tomcat.jdbc.pool.DataSource。因为mybatis-spring-boot-starter已经集成了mybatis，所以不需要额外引入mybatis的包。

2.数据源配置

package com.example.myproject.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import com.alibaba.druid.pool.DruidDataSource;

@Configuration
/**
 * 这种注解方式也是可行的
 * @MapperScan(value="com.example.myproject.mapper",basePackages="com.example.myproject.mapper",sqlSessionFactoryRef = "sqlSessionFactory")
 *  扫描mapper包,并引入对应的sqlSessionFactory
 */
@MapperScan("com.example.myproject.mapper")
public class RepositoryConfig {

    /**
     * 读取application.properties里面的数据源信息，并赋值给数据源配置
     * */
    @Bean
    @ConfigurationProperties(prefix="jdbc")
    public DruidDataSource dataSource() {
        String driverClassName = null;
        String url = null;
        String userName = null;
        String password = null;

        final DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driverClassName);
        dataSource.setUrl(url);
        dataSource.setUsername(userName);
        dataSource.setPassword(password);
        return dataSource;
    }

    /**
     * 设置SqlSessionFactory配置
     * */
    @Bean
    public SqlSessionFactory sqlSessionFactory() throws Exception {

        SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
        ssfb.setDataSource(dataSource());
        ssfb.setMapperLocations(new      PathMatchingResourcePatternResolver().getResources("classpath:mapper/**/*.xml"));

        return ssfb.getObject();
    }

    /**
     * 事务配置
     * */
    @Bean
    public PlatformTransactionManager transactionManager() {
        return new DataSourceTransactionManager(dataSource());
    }

}

---

application.properties配置

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1/test?useUnicode=true&characterEncoding=utf-8
jdbc.userName=root
jdbc.password=admin

其实到这步就已经大功告成了,其他的配置如同我们用xml配置一样.

3.其他代码

Controller代码块

@RestController
public class UserController {

    @Autowired
    private UserService UserService;

    @RequestMapping("/getUser")
    public User getUser(Integer id){
        return UserService.getUser(id);
    }

}

Service代码块

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public User getUser(Integer id) {
        return userMapper.getUser(id);
    }

}

mapper代码块

namespace="com.example.myproject.mapper.UserMapper">


    <select id="getUser" resultType="com.example.myproject.model.User" parameterType="int">
        select
         id,
         name,
         age
        from user
        where id = #{id}
    select>

4.总结

在使用springBoot整合mybatis的时候,大多时候采用注解的方式,当然你也可以用xml配置的方式,然后用@importSource引入.当然采用注解的方式可以更直接的OOP也去除了繁杂的xml配置更加契合了springBoot的设计初衷.在配置的时候可以多联想当初Spring整合mybatis的配置,其实一切就会都变得非常简单了!