Mybatis是常用的持久层框架，体验Spring Boot的同时不免需要将Mybatis整合进去

引入maven依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.1.RELEASE</version>
</parent>
<dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.1.1</version>
    </dependency>
    <dependency>
      <groupId>com.zaxxer</groupId>
      <artifactId>HikariCP</artifactId>
      <version>2.5.1</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.35</version>
    </dependency>
  </dependencies>

本文用的是HikariCP连接池，也可以使用其他连接池

数据源属性

在application.properties中添加

datasource.pool.jdbcUrl=jdbc:mysql://
datasource.pool.username=root
datasource.pool.password=
datasource.pool.maximumPoolSize=100

配置一个Mybatis配置

@Configuration
@EnableTransactionManagement
public class MybatisConfig {
    @Bean
    @ConfigurationProperties(prefix = "datasource.pool")
    public DataSource dataSource(){
        return new HikariDataSource();
    }
    @Bean
    public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        return sqlSessionFactoryBean.getObject();
    }
}

@EnableTransactionManagement开启事务管理

配置mapper

@Mapper
public interface StudentMapper {
    @Select("select * from student")
    @ResultType(value = Student.class)
    List<Student> getAll();
}

@ComponentScan会自动扫描@Mapper注解的类
也可以用@MapperScan来指定

@MapperScan(basePackages = "com.drafthj.test")
public class MybatisConfig {
        ...
}

接下来就可以直接使用Mapper类来操作了

@Autowired
private StudentMapper studentMapper;

使用xml文件配置

1、可以在application.properties中mybatis.config-location=来指定文件位置
2、sqlSessionFactoryBean.setConfigLocation()