前言

Spring Boot项目使用Mybatis，既要从上游系统同步数据，又要操作本系统的数据库，所以需要引入双数据源，配置Mybatis

步骤

一、配置双数据源，连接数据库

1、禁用Spring Boot数据源的自动装配，在启动类@SpringBootApplication注解添加exclude = {DataSourceAutoConfiguration.class}

@SpringBootApplication(scanBasePackages = {"com.linkus"}, exclude = {DataSourceAutoConfiguration.class, MybatisAutoConfiguration.class})
public class Application {

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

2、application.properties配置文件添加两个数据源配置

ora.datasource.driverClassName=oracle.jdbc.OracleDriver
ora.datasource.url=jdbc:oracle:thin:@ip:port:db
ora.datasource.username=xxx
ora.datasource.password=xxx

spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://ip:port/db
spring.datasource.username=xxx
spring.datasource.password=xxx

3、添加oracle数据源配置类PrimaryDataSourceConfig，下面的pg数据源配置类DmpDataSourceConfig，添加对应数据源的bean
PrimaryDataSourceConfig

@Primary
@Bean(name = "primaryDataSource")
@ConfigurationProperties(prefix = "ora.datasource")
public DataSource oraDataSource() {
    return DruidDataSourceBuilder.create().build();
}

DmpDataSourceConfig

@Bean(name = "dmpDataSource")
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource dataSource() {
    return DruidDataSourceBuilder.create().build();
}

两个数据源添加完成

二、配置两个Mybatis

1、禁用Mybatis自动装配，启动类@SpringBootApplication注解添加exclude = {DataSourceAutoConfiguration.class, MybatisAutoConfiguration.class}

2、在application.properties配置文件添加两个Mybatis的配置和对应的配置类

主数据源的mybatis配置

# mybatis mapper.xml路径
ora.datasource.extend.mybatisMapperLocations=classpath*:mapper/crm/*.xml

主数据源的配置类

@Configuration
@ConfigurationProperties(prefix = "ora.datasource.extend")
public class PrimaryMybatisProperties {

    private String mybatisMapperLocations;

    public String getMybatisMapperLocations() {
        return mybatisMapperLocations;
    }

    public void setMybatisMapperLocations(String mybatisMapperLocations) {
        this.mybatisMapperLocations = mybatisMapperLocations;
    }
}

数据源2的配置

# mybatis mapper.xml路径
spring.datasource.extend.mybatisMapperLocations=classpath*:mapper/dmp/*.xml

数据源2的配置类

@Configuration
@ConfigurationProperties(prefix = "spring.datasource.extend")
public class DmpMybatisProperties {

    private String mybatisMapperLocations;

    public String getMybatisMapperLocations() {
        return mybatisMapperLocations;
    }

    public void setMybatisMapperLocations(String mybatisMapperLocations) {
        this.mybatisMapperLocations = mybatisMapperLocations;
    }
}

3、配置两个Mybatis的SqlSessionFactory

@Configuration
@MapperScan(basePackages = {"com.linkus.abp.mapper.crm"}, sqlSessionFactoryRef = "primarySqlSessionFactory")
@Slf4j
public class PrimaryDataSourceConfig {

    @Autowired
    private PrimaryMybatisProperties properties;

    @Primary
    @Bean(name = "primaryDataSource")
    @ConfigurationProperties(prefix = "ora.datasource")
    public DataSource oraDataSource() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "primarySqlSessionFactory")
    @Primary
    public SqlSessionFactory sqlSessionFactory(@Qualifier("primaryDataSource") DataSource dataSource) {
        try {
            SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
            sqlSessionFactoryBean.setDataSource(dataSource);
            sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                    .getResources(this.properties.getMybatisMapperLocations()));
            log.info("config primarySqlSessionFactory success.");
            return sqlSessionFactoryBean.getObject();
        } catch (Exception e) {
            log.error("config primarySqlSessionFactory failed.", e);
            e.printStackTrace();
        }
        return null;
    }

    @Bean(name = "primarySqlSessionTemplate")
    @Primary
    public SqlSessionTemplate sqlSessionTemplate(@Qualifier("primarySqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

    @Bean(name = "primaryTransactionManager")
    @Primary
    public DataSourceTransactionManager transactionManager(@Qualifier("primaryDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

}

@Configuration
@MapperScan(basePackages = {"com.linkus.abp.mapper.dmp"}, sqlSessionFactoryRef = "dmpSqlSessionFactory")
@Slf4j
public class DmpDataSourceConfig {

    @Autowired
    private DmpMybatisProperties property;

    @Bean(name = "dmpDataSource")
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource() {
        return DruidDataSourceBuilder.create().build();
    }

    @Bean(name = "dmpSqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("dmpDataSource") DataSource dataSource) {
        try {
            SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
            sessionFactory.setDataSource(dataSource);
            sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                    .getResources(this.property.getMybatisMapperLocations()));
            log.info("config dmpSqlSessionFactory success.");
            return sessionFactory.getObject();
        } catch (Exception e) {
            log.error("config dmpSqlSessionFactory failed.", e);
            e.printStackTrace();
        }
        return null;
    }

    @Bean(name = "dmpSqlSessionTemplate")
    public SqlSessionTemplate sqlSessionTemplate(@Qualifier("dmpSqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

    @Bean(name = "dmpTransactionManager")
    public DataSourceTransactionManager transactionManager(@Qualifier("dmpDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
}

两个Mybatis配置完可以工作了，如果需要分页还要配置两个Mybatis的分页