MyBaits多数据源配置

首先准备一个SpringBoot项目，主要依赖如下：

		<parent>
        	<groupId>org.springframework.boot</groupId>
        	<artifactId>spring-boot-starter-parent</artifactId>
        	<version>2.2.2.RELEASE</version>
        	<relativePath/> <!-- lookup parent from repository -->
    	</parent>
    
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.4</version>
        </dependency>

####注意是jdbc-url而不是url,不然会报错：Cause: java.lang.IllegalArgumentException: jdbcUrl is required with driverClassName.

spring:
  datasource:
    primary:
      driver-class-name: com.mysql.cj.jdbc.Driver
      jdbc-url: jdbc:mysql://localhost:3306/executor?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
      username: root
      password: root
    secondary:
      driver-class-name: com.mysql.cj.jdbc.Driver
      jdbc-url: jdbc:mysql://localhost:3306/halo_dev?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
      username: root
      password: root

/**
 * @author 晓果冻
 * @version 1.0
 * @date 2021/10/24 15:39
 */
@Configuration
//basePackages是接口路径
@MapperScan(basePackages = "com.cgd.xxljobexecutor.dao.executor", sqlSessionFactoryRef = "PrimarySqlSessionFactory")//basePackages:接口文件的包路径
public class PrimaryDataSourceConfig {

    @Bean(name = "PrimaryDataSource")
    // 表示这个数据源是默认数据源
    @Primary//这个一定要加，如果两个数据源都没有@Primary会报错
    @ConfigurationProperties(prefix = "spring.datasource.primary")//我们配置文件中的前缀
    public DataSource getPrimaryDateSource() {
        return DataSourceBuilder.create().build();
    }


    @Bean(name = "PrimarySqlSessionFactory")
    @Primary
    public SqlSessionFactory primarySqlSessionFactory(@Qualifier("PrimaryDataSource") DataSource datasource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        //这里需要mybatis的xml的路径
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/executor/*.xml"));
        return bean.getObject();// 设置mybatis的xml所在位置
    }

    @Bean("PrimarySqlSessionTemplate")
    // 表示这个数据源是默认数据源
    @Primary
    public SqlSessionTemplate primarySqlSessionTemplate(
            @Qualifier("PrimarySqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

/**
 * @author 晓果冻
 * @version 1.0
 * @date 2021/10/24 15:41
 */
@Configuration
@MapperScan(basePackages = "com.cgd.xxljobexecutor.dao.halo", sqlSessionFactoryRef = "SecondarySqlSessionFactory")
public class SecondaryDataSourceConfig {

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

    @Bean(name = "SecondarySqlSessionFactory")
    public SqlSessionFactory secondarySqlSessionFactory(@Qualifier("SecondaryDataSource") DataSource datasource)
            throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/halo/*.xml"));
        return bean.getObject();// 设置mybatis的xml所在位置
    }

    @Bean("SecondarySqlSessionTemplate")
    public SqlSessionTemplate secondarySqlSessionTemplate(
            @Qualifier("SecondarySqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}