一、背景

在SpringBoot Mybatis 项目中，需要连接多个数据源，连接多个数据库，需要连接一个MySQL数据库和一个Oracle数据库

二、依赖 pom.xml

 <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- MySQL -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.26</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- Oracle -->
        <dependency>
            <groupId>com.oracle.database.jdbc</groupId>
            <artifactId>ojdbc8</artifactId>
            <version>19.8.0.0</version>
        </dependency>

        <!-- Redis -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.4.4</version>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.persistence</groupId>
            <artifactId>javax.persistence-api</artifactId>
            <version>2.2</version>
        </dependency>
        <!--swagger2-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!--swagger-ui-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>


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

    </dependencies>

三、项目结构

四、application.yml

spring.datasource.url数据库的JDBC URL

spring.datasource.jdbc-url用来重写自定义连接池

Hikari没有url属性，但是有jdbcUrl属性，在这中情况下必须使用jdbc_url

server:
  port: 8080

spring:
  datasource:
    primary:
      jdbc-url: jdbc:mysql://localhost:3306/database_name
      username: root
      password: 123456
      driver-class-name: com.mysql.cj.jdbc.Driver

    secondary:
      jdbc-url: jdbc:oracle:thin:@localhost:1521/ORCL
      username: root
      password: 123456
      driver-class-name: oracle.jdbc.driver.OracleDriver

五、MySQL配置类

MysqlDataSourceConfig

使用注解@Primary配置默认数据源

package com.example.multipledata.config.mysqlconfig;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;


@Configuration
@MapperScan(basePackages = MysqlDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "mysqlSqlSessionFactory")
public class MysqlDataSourceConfig {
   
    static final String PACKAGE = "com.example.multipledata.mapper.mysqlmapper";

    static final String MAPPER_LOCATION = "classpath*:mapper/mysqlmapper/*.xml";

    @Primary
    @Bean(name = "mysqlDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.primary")
    public DataSource mysqlDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "mysqlTransactionManager")
    public DataSourceTransactionManager mysqlTransactionManager() {
        return new DataSourceTransactionManager((mysqlDataSource()));
    }

    @Primary
    @Bean(name = "mysqlSqlSessionFactory")
    public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("mysqlDataSource") DataSource mysqlDatasource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(mysqlDatasource);
        sessionFactory.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources(MysqlDataSourceConfig.MAPPER_LOCATION)
        );
        return sessionFactory.getObject();
    }
}

六、Oracle配置类

OracleDataSourceConfig

package com.example.multipledata.config.oracleconfig;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

@Configuration
@MapperScan(basePackages = OracleDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "oracleSqlSessionFactory")
public class OracleDataSourceConfig {

    static final String PACKAGE = "com.example.multipledata.mapper.oraclemapper";

    static final String MAPPER_LOCATION = "classpath*:mapper/oraclemapper/*.xml";

    @Bean(name = "oracleDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.secondary")
    public DataSource oracleDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "oracleTransactionManager")
    public DataSourceTransactionManager oracleTransactionManager() {
        return new DataSourceTransactionManager(oracleDataSource());
    }

    @Bean(name = "oracleSqlSessionFactory")
    public SqlSessionFactory oracleSqlSessionFactory(@Qualifier("oracleDataSource") DataSource oracleDataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(oracleDataSource);
        sessionFactory.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources(OracleDataSourceConfig.MAPPER_LOCATION)
        );
        return sessionFactory.getObject();
    }
}

原文地址：

https://www.cnblogs.com/windy-xmwh/p/14748567.html

SpringBoot Mybatis 多数据源 MySQL+Oracle