springboot结合baomidou dynamic-datasourc组件实现多数据源

三方组件pom：

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>2.5.4</version>
        </dependency>

使用方式：

1、properties文件配置多数据源，设置主数据源(这里的登录信息的ip端口过滤处理了，替换成自己的即可)

spring.datasource.dynamic.primary=master
spring.datasource.dynamic.datasource.mysql.url=jdbc:mysql://.../emaotong?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8&allowMultiQueries=true
spring.datasource.dynamic.datasource.mysql.username=
spring.datasource.dynamic.datasource.mysql.password=
spring.datasource.dynamic.datasource.mysql.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.dynamic.datasource.oracle.url=jdbc:oracle:thin:@.../orcl
spring.datasource.dynamic.datasource.oracle.username=
spring.datasource.dynamic.datasource.oracle.password=
spring.datasource.dynamic.datasource.oracle.driver-class-name=oracle.jdbc.driver.OracleDriver

2、在service的对应方法上使用@DS注解指定使用的数据源，不指定则使用默认数据源

    @Override
    @DS("oracle")
    public int oracleInvoiceCount() {
        return testMapper.oracleInvoiceCount();
    }

    @Override
    @DS("mysql")
    public int mysqlInvoiceCount() {
        return testMapper.mysqlInvoiceCount();
    }

项目结构：

 全部代码：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.zhen.study</groupId>
    <artifactId>dynamic-datasource</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>dynamic-datasource</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.oracle.database.jdbc</groupId>
            <artifactId>ojdbc8</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/cn.easyproject/orai18n -->
        <dependency>
            <groupId>cn.easyproject</groupId>
            <artifactId>orai18n</artifactId>
            <version>12.1.0.2.0</version>
        </dependency>

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

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
            <version>3.3.6</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

server.port=8080
mybatis.mapper-locations=classpath:mapper/*.xml

spring.datasource.dynamic.primary=master
spring.datasource.dynamic.strict=false
spring.datasource.dynamic.datasource.mysql.url=jdbc:mysql://.../emaotong?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8&allowMultiQueries=true
spring.datasource.dynamic.datasource.mysql.username=
spring.datasource.dynamic.datasource.mysql.password=
spring.datasource.dynamic.datasource.mysql.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.dynamic.datasource.oracle.url=jdbc:oracle:thin:@.../orcl
spring.datasource.dynamic.datasource.oracle.username=
spring.datasource.dynamic.datasource.oracle.password=
spring.datasource.dynamic.datasource.oracle.driver-class-name=oracle.jdbc.driver.OracleDriver

package com.zhen.study.dynamicdatasource;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author zhen
 */
@SpringBootApplication
@MapperScan("com.zhen.study.dynamicdatasource.mapper")
public class DynamicDatasourceApplication {

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

}

package com.zhen.study.dynamicdatasource.mapper;

/**
 * @author zhen
 */
public interface TestMapper {

    /**
     * 查询oracle中发票数
     * @return
     */
    public int oracleInvoiceCount();

    /**
     * 查询mysql中发票数
     * @return
     */
    public int mysqlInvoiceCount();
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zhen.study.dynamicdatasource.mapper.TestMapper">

    <select id="oracleInvoiceCount"  resultType="java.lang.Integer">
        select count(*) from so_saleinvoice
    </select>

    <select id="mysqlInvoiceCount"  resultType="java.lang.Integer">
        select count(*) from sale_invoice
    </select>

</mapper>

package com.zhen.study.dynamicdatasource.service;

/**
 * @author zhen
 */
public interface TestService {
    /**
     * 查询oracle中发票数
     * @return
     */
    public int oracleInvoiceCount();

    /**
     * 查询mysql中发票数
     * @return
     */
    public int mysqlInvoiceCount();
}

package com.zhen.study.dynamicdatasource.service.impl;

import com.baomidou.dynamic.datasource.annotation.DS;
import com.zhen.study.dynamicdatasource.mapper.TestMapper;
import com.zhen.study.dynamicdatasource.service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author zhen
 */
@Service
public class TestServiceImpl implements TestService {
    @Autowired
    private TestMapper testMapper;

    @Override
    @DS("oracle")
    public int oracleInvoiceCount() {
        return testMapper.oracleInvoiceCount();
    }

    @Override
    @DS("mysql")
    public int mysqlInvoiceCount() {
        return testMapper.mysqlInvoiceCount();
    }
}