spring boot 2 - 数据访问单元测试指标监控原理解析

Posted 2021-08-30 之墨_

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参考自尚硅谷语雀spring boot2教程文档

spring boot 2 - 数据访问、单元测试、指标监控、原理解析

一、[数据访问](https://www.yuque.com/atguigu/springboot/aob431)
二、[单元测试](https://www.yuque.com/atguigu/springboot/ksndgx)
三、[指标监控](https://www.yuque.com/atguigu/springboot/sgpvgn)
四、[原理解析](https://www.yuque.com/atguigu/springboot/tmvr0e)

一、数据访问

一、连接mysql

1、数据源的自动配置-HikariDataSource

1.1导入JDBC场景

指定MySql版本，才会自动导入驱动

2、自动配置原理

2.1.自动配置的类

DataSourceAutoConfiguration ：数据源的自动配置
修改数据源相关的配置：spring.datasource
数据库连接池的配置，是自己容器中没有DataSource才自动配置的
底层配置好的连接池是：HikariDataSource

@Configuration(proxyBeanMethods = false)
@Conditional(PooledDataSourceCondition.class)
@ConditionalOnMissingBean({ DataSource.class, XADataSource.class })
@Import({ DataSourceConfiguration.Hikari.class, DataSourceConfiguration.Tomcat.class,
		DataSourceConfiguration.Dbcp2.class, DataSourceConfiguration.OracleUcp.class,
		DataSourceConfiguration.Generic.class, DataSourceJmxConfiguration.class })
protected static class PooledDataSourceConfiguration

2.2自定义配置

2.3.编译测试类

2.4.测试结果

三条数据，查询正确

二、整合Driud数据源

Druid官方github地址

1、创建数据源

1.1引入starter启动器配置

1.2yaml配置文件配置

1.3测试

三、整合MyBatis

二、单元测试

三、指标监控

四、原理解析

1、Profile功能

springboot简化了profile功能，方便多环境适配

1.1.application-profile功能

默认配置文件 application.yaml；任何时候都会加载
指定环境配置文件 application-{env}.yaml
激活指定环境
1.配置文件激活
2.命令行激活：java -jar xxx.jar --spring.profiles.active=prod --person.name=haha
修改配置文件的任意值，命令行优先
默认配置与环境配置同时生效
同名配置项，profile配置优先

1.2、@Profile条件装配功能

1.3.profile分组

2、外部化配置

spring官方文档

Default properties (specified by setting SpringApplication.setDefaultProperties).
@PropertySource annotations on your @Configuration classes. Please note that such property sources are not added to the Environment until the application context is being refreshed. This is too late to configure certain properties such as logging.* and spring.main.* which are read before refresh begins.
Config data (such as application.properties files)
A RandomValuePropertySource that has properties only in random.*.
OS environment variables.
Java System properties (System.getProperties()).
JNDI attributes from java:comp/env.
ServletContext init parameters.
ServletConfig init parameters.
Properties from SPRING_APPLICATION_JSON (inline JSON embedded
in an environment variable or system property).
Command line arguments.properties attribute on your tests. Available on @SpringBootTest and the test annotations for testing a particular slice of your application.
@TestPropertySource annotations on your tests.
Devtools global settings properties in the $HOME/.config/spring-boot directory when devtools is active.