2019独角兽企业重金招聘Python工程师标准>>> 
参考：https://www.jianshu.com/p/735852145580
maven依赖
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.2.0
mysql
mysql-connector-java
5.1.39
com.alibaba
druid
1.0.18
在application.yml文件中配置两个数据源；如
spring:
datasource:
url: jdbc:mysql://aaaaaaaaa/aaaaaaaaaa?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: aaaaa
password: aaaaaaaaaa
driver-class-name: com.mysql.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
改为：
spring:
datasource:
aaaa:
url: jdbc:mysql://aaaaaaaaaaa/aaaaaaaa?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: aaaaaaaaa
driver-class-name: com.mysql.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
bbbb:
url: jdbc:mysql://bbbbbbbbbbbbbb/bbbbbbbb?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: bbbbbbb
driver-class-name: com.mysql.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
这一步没什么好说的，毕竟两个数据源肯定有两套配置文件，加载的时候区分就好。
application.yaml的话：
# master 数据源配置
master.datasource.url=jdbc:mysql://localhost:3306/springbootdb?useUnicode=true&characterEncoding=utf8
master.datasource.username=root
master.datasource.password=321
master.datasource.driverClassName=com.mysql.jdbc.Driver
# second 数据源配置
second.datasource.url=jdbc:mysql://localhost:3306/springbootdb_second?useUnicode=true&characterEncoding=utf8
second.datasource.username=root
second.datasource.password=321
second.datasource.driverClassName=com.mysql.jdbc.Driver加载bean
第一个数据源：
@Configuration
@MapperScan(basePackages = MasterDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterDataSourceConfig {
// 精确到 master 目录，以便跟其他数据源隔离
static final String PACKAGE = "org.spring.springboot.dao.master";
static final String MAPPER_LOCATION = "classpath:mapper/master/*.xml";
//这里重点说一下，因为自己掉坑里了,我是mapper文件夹下有两个文件夹aa,bb,这里必须填到具体的文件夹，如mapper/aa或mapper/bb
@Value("${master.datasource.url}")
private String url;
@Value("${master.datasource.username}")
private String user;
@Value("${master.datasource.password}")
private String password;
@Value("${master.datasource.driverClassName}")
private String driverClass;
@Bean(name = "masterDataSource")
@Primary
public DataSource masterDataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(driverClass);
dataSource.setUrl(url);
dataSource.setUsername(user);
dataSource.setPassword(password);
return dataSource;
}
@Bean(name = "masterTransactionManager")
@Primary
public DataSourceTransactionManager masterTransactionManager() {
return new DataSourceTransactionManager(masterDataSource());
}
@Bean(name = "masterSqlSessionFactory")
@Primary
public SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource masterDataSource)
throws Exception {
final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
sessionFactory.setDataSource(masterDataSource);
sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
.getResources(MasterDataSourceConfig.MAPPER_LOCATION));
return sessionFactory.getObject();
}
}第二个数据源SecondDataSourceConfig的配置如下:
@Configuration
// 扫描 Mapper 接口并容器管理
@MapperScan(basePackages = SecondDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "secondSqlSessionFactory")
public class SecondDataSourceConfig {
// 精确到 cluster 目录，以便跟其他数据源隔离
static final String PACKAGE = "com.springboot.dao.second";
static final String MAPPER_LOCATION = "classpath:mapper/second/*.xml";
@Value("${second.datasource.url}")
private String url;
@Value("${second.datasource.username}")
private String user;
@Value("${second.datasource.password}")
private String password;
@Value("${second.datasource.driverClassName}")
private String driverClass;
@Bean(name = "secondDataSource")
public DataSource clusterDataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(driverClass);
dataSource.setUrl(url);
dataSource.setUsername(user);
dataSource.setPassword(password);
return dataSource;
}
@Bean(name = "secondTransactionManager")
public DataSourceTransactionManager clusterTransactionManager() {
return new DataSourceTransactionManager(clusterDataSource());
}
@Bean(name = "secondSqlSessionFactory")
public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("secondDataSource") DataSource clusterDataSource)
throws Exception {
final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
sessionFactory.setDataSource(clusterDataSource);
sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
.getResources(SecondDataSourceConfig.MAPPER_LOCATION));
return sessionFactory.getObject();
}
}
剩下的就没啥了，博主讲的很详细，我说一下自己遇见的坑吧：
1，
static final String MAPPER_LOCATION = "classpath:mapper/second/*.xml";我第一次这里配的不详细，我没有配到了master/和second/，只配到mapper/，以为会自动向下扫描，结果并没有。。。
2，@primary
DataSourceTransactionManager SqlSessionFactory 都没有加@primary或者都加了
结论：连个配置类只有一个类可以加，springboot会优先选择这个