Spring Boot 整合Mybatis (一)

新建spring-boot项目，相关依赖

        <dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<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>1.3.2</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

使用Druid 连接池 引入依赖

		<!--引入druid-->
		<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.10</version>
		</dependency>

编写Druid配置类

也可以在配置文件中直接配置

@Configuration
public class DruidConfig {

    //关联yml文件中的配置项
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druid() {

        return  DruidDataSourceBuilder.create().build();

    }

    //配置druid 的监控
//    1.配置管理后台的servlet
    @Bean
    public ServletRegistrationBean startViewServlet() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");

        Map<String, String> map = new HashMap<>();
        map.put("loginUsername", "admin");
        map.put("loginPassword", "123456");
        map.put("allow", "");//默认允许所有访问
//        map.put("deny" , "192.168.11.72");
        bean.setInitParameters(map);
        return bean;
    }

    //2.配置一个web监控的filter
    @Bean
    public FilterRegistrationBean webStatFilter() {
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());

        Map<String, String> map = new HashMap<>();
        map.put("exclusions", "*.js,*.css,/druid/*");

        bean.setInitParameters(map);
        bean.setUrlPatterns(Arrays.asList("/*"));
        return bean;
    }

}

配置文件中配置的相关属性

#   application.yml文件采用yml文件格式配置

spring:
  datasource:
#   数据源基本配置
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.11.72:3306/boot08
#    type: com.alibaba.druid.pool.DruidDataSource
#   数据源其他配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
#   配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

mybatis相关配置可以使用配置类或者配置文件

public class MybtisConfig {

    //开启驼峰
    public ConfigurationCustomizer configurationCustomizer(){
        return new ConfigurationCustomizer() {
            @Override
            public void customize(Configuration configuration) {
                configuration.setMapUnderscoreToCamelCase(true);
            }
        };
    }
}

mapper.class文件

//@Mapper
public interface DepartmentMapper {

    @Select("select * from department")
    public List<Department> getList();

}


@MapperScan(value = "com.wgm")
@SpringBootApplication
public class BootmybatisApplication {

注意，使用@Mapper注解扫描当前接口 ，或者是使用@MapperScan注解扫描包 都会添加到容器中

这种方式，sql语句可以直接写在方法上

或者使用配置文件相关方式，即传统的配置mybatis-config.xml ,/mapper/*.xml

配置文件中需要修改

mybatis:
  config-location: classpath:mybatis/mybatis-config.xml
  mapper-locations: classpath:mybatis/mapper/*.xml

文件目录