If you are a beginner of springboot framework, and you want to using mybatis in your project.
And I have demos:
- What is the mybatis?
MyBatis 是支持定制化 SQL、存储过程以及高级映射的优秀的持久层框架。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以对配置和原生Map使用简单的 XML 或注解，将接口和 Java 的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。
-
Add dependencies to your project
<!--mybatis--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.0</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.0</version> </dependency> -
How to using mybatis?
实际中，mybatis的sqlSessionFactory对象既可以通过xml方式构造，也可以通过POJO方式构造。
String resource = "org/mybatis/example/mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
其中，mybatis-config.xml最好放在resources文件夹下
<?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>
<environments default="development">
<environment id="development">
//事务管理
<transactionManager type="JDBC"/>
//连接池
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
//映射文件
<mapper resource="org/mybatis/example/BlogMapper.xml"/>
</mappers>
</configuration>
通过sqlSessionFactory工厂类取得sqlSession
SqlSession sqlSession = SqlSessionFactory.openSession();
由于SqlSession封装了所有的面向对象执行SQL的方法，你可以通过它来执行SQL
SqlSession session = sqlSessionFactory.openSession();
try {
BlogMapper mapper = session.getMapper(BlogMapper.class);
Blog blog = mapper.selectBlog(101);
} finally {
session.close();
}
当然，以POJO方式，结合注解，在springboot中，使用起来可能更方便一些。
springboot实例：
@SpringBootApplication
@EnableAutoConfiguration
@ImportResource({"springboot-mybatis.xml"})
@PropertySource(value = "application.properties")
@ComponentScan
@MapperScan("com.jim.mybatis.mapper")
public class SpringbootMybatisApplication {
@Bean
@ConfigurationProperties(prefix="spring.datasource")
public DataSource dataSource() {
return new org.apache.tomcat.jdbc.pool.DataSource();
}
@Bean
public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource());
PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/mappers/*.xml"));
sqlSessionFactoryBean.setConfigLocation(resolver.getResource("classpath:/mybatis.config.xml"));
return sqlSessionFactoryBean.getObject();
}
@Bean
public PlatformTransactionManager transactionManager() {
return new DataSourceTransactionManager(dataSource());
}
public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisApplication.class, args);
}
}
- How to using mybatis generator plugin?
在intellj idea 中安装mybatis plugin
- Add a new method to Mapper class
- Add a SQL to mapper xml file
- call the new method in impl class
- call service in controller and return result
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