springBoot多数据源使用、配置

又参加了一个新的项目，虽然是去年做的项目，拿来复用改造，但是也学到了很多。这个项目会用到其他项目的数据，如果调用他们的接口取数据，我还是觉得太麻烦了。打算直接配置多数据源。

然后去另一个数据库系统中取出数据。

所以就去了解和学习了一下

druid和dynamic配合的多数据源，用起来还是挺简单的：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>dsjyTest</artifactId><version>1.0-SNAPSHOT</version><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.8</version><relativePath/></parent><dependencies><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.5.3.1</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--      druid连接池  --><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.22</version></dependency><!--        mysql驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.29</version></dependency><!-- dynamic多数据源 --><dependency><groupId>com.baomidou</groupId><artifactId>dynamic-datasource-spring-boot-starter</artifactId><version>3.1.1</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.30</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><version>2.7.17</version></dependency></dependencies><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties></project>
v

然后就是写application：

spring:datasource:dynamic:#默认主库，平时默认查询这个库primary: masterstrict: falsedatasource:#数据源名称1master:type: com.alibaba.druid.pool.DruidDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://192.168.126.153:3306/dsjy?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTCusername: rootpassword: 123456#数据源名称2device:type: com.alibaba.druid.pool.DruidDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTCusername: rootpassword: 123456

就是配置两个数据库信息，后续使用@DS("数据源名称")

将数据源配置到bean中：

package com.dsjy.config;import javax.annotation.Resource;
import javax.sql.DataSource;import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;import com.baomidou.dynamic.datasource.DynamicRoutingDataSource;
import com.baomidou.dynamic.datasource.provider.DynamicDataSourceProvider;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceAutoConfiguration;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceProperties;/*** 动态数据源配置** @author admin*/
@Configuration
@AutoConfigureBefore({DynamicDataSourceAutoConfiguration.class, SpringBootConfiguration.class})
public class DataSourceConfiguration {@Resourceprivate DynamicDataSourceProperties properties;/*** 将动态数据源设置为首选的* 当spring存在多个数据源时, 自动注入的是首选的对象*/@Primary@Beanpublic DataSource dataSource(DynamicDataSourceProvider dynamicDataSourceProvider) {DynamicRoutingDataSource dataSource = new DynamicRoutingDataSource();dataSource.setPrimary(properties.getPrimary());dataSource.setStrict(properties.getStrict());dataSource.setStrategy(properties.getStrategy());dataSource.setProvider(dynamicDataSourceProvider);dataSource.setP6spy(properties.getP6spy());dataSource.setSeata(properties.getSeata());return dataSource;}}

druid监控页面配置：

package com.dsjy.config;import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;@Configuration
public class DruidConfig {/*** 配置Druid的监控* 配置一个管理后台的Servlet* @return*/@Beanpublic ServletRegistrationBean statViewServlet(){ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");Map<String, String> initParams = new HashMap<>(4);//配置druid页面监控的账户密码initParams.put("loginUsername", "sh");initParams.put("loginPassword","123456");bean.setInitParameters(initParams);return bean;}/*** 配置一个web监控的filter* @return*/@Beanpublic FilterRegistrationBean webStatFilter(){FilterRegistrationBean bean = new FilterRegistrationBean();bean.setFilter(new WebStatFilter());Map<String, String> initParams = new HashMap<>(16);initParams.put("exclusions","*.js,*.css,/druid/*");bean.setInitParameters(initParams);bean.setUrlPatterns(Arrays.asList("/*"));return  bean;}
}

配置了druid之后，项目运行起来就能访问,http://127.0.0.1:8080/druid,可以看见有两个数据源可以使用。

package com.dsjy.mapper;import com.baomidou.dynamic.datasource.annotation.DS;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.dsjy.entity.UserEntity;/*** @program: springBoot* @author: quxiao* @create: 2024-06-12 15:36**/
public interface UserMapper extends BaseMapper<UserEntity> {@DS("master")String selectNumber1();@DS("device")String selectNumber2();
}

使用@DS("数据源名称") ，就能指定使用某一个数据源。还可以使用