SpringBoot整合Mybatis

SpringBoot整合Mybatis

相关代码:
github OSCchina

引入依赖

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.2.0</version>
</dependency>

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.3</version>
</dependency>

配置数据源

在application.properties里配置mysql数据源

spring.datasource.url=jdbc:mysql://localhost:3306/SpringBootTest
spring.datasource.username=root
spring.datasource.password=1
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

使用Mybatis

1.创建实体对象

public class User implements Serializable {
private Integer userId;

private String name;

private String email;

private Integer age;

private Date birthday;
//getter/setter
}

2.配置mybatis

@Configuration//声明这是用来配置的类,用来取代xml配置
public class MybatisConfig {

/**
* 注入一个默认数据源
*/
@Autowired
private DataSource dataSource;

/**
* SqlSessionFactory配置
*
* @return
* @throws Exception
*/
@Bean
public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource);

PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
//配置mapper文件位置
sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:mapper/*.xml"));
return sqlSessionFactoryBean.getObject();
}

/**
* 配置事物管理器
*
* @return
*/
@Bean
public DataSourceTransactionManager transactionManager() {
DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();
dataSourceTransactionManager.setDataSource(dataSource);
return dataSourceTransactionManager;
}
}

@SpringBootApplication
@MapperScan(value = "com.lc.springBoot.druid.mapper")//需要扫描的mapper接口所在包
public class App {

public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}

注解说明

1.@MapperScan:配置需要扫描的mapper接口位置,除此之外,我们也可以用MapperScannerConfigurer来配置

@Configuration
//MapperScannerConfigurer执行的比较早，所以必须有下面的注解
@AutoConfigureAfter(MybatisConfig.class)
public class MapperScannerConfig {

@Bean
public MapperScannerConfigurer mapperScannerConfigurer() {
MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
mapperScannerConfigurer.setBasePackage("com.lc.springBoot.druid.mapper");
return mapperScannerConfigurer;
}
}

这里需要注意的是,如果我们使用@MapperScan的话,必须把它放在我们的启动类上,就是App这个类.

2.@Configuration:表明这是一个配置类,用来代替xml配置

配置插件

1.PageHelper分页插件配置,这里需要注意下Mybatis版本和PageHelper版本的兼容

<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.2.0</version>
</dependency>

@Bean
public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource);

PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
//配置mapper文件位置
sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:mapper/*.xml"));

//配置分页插件
PageHelper pageHelper = new PageHelper();
Properties properties = new Properties();
properties.setProperty("reasonable", "true");
properties.setProperty("supportMethodsArguments", "true");
properties.setProperty("returnPageInfo", "check");
properties.setProperty("params", "count=countSql");
pageHelper.setProperties(properties);

//设置插件
sqlSessionFactoryBean.setPlugins(new Interceptor[]{pageHelper});
return sqlSessionFactoryBean.getObject();
}