框架：SpringBoot + Mybatis + Activiti7
思路：
单独给mybatis和activiti配置datasource
Mybati配置单数据源方法
单数据源只需要在yml中配置
url: jdbc:mysql://localhost:3306/localtest?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useSSL=false&nullCatalogMeansCurrent=true driver-class-name: com.mysql.cj.jdbc.Driver username: root password: 123456
Mybati配置双数据源方法
给每个mybatis配置类分别设置数据源，然后使用MapperScan声明作用的mapper路径
此时url需要写成jdbc-url，不然会报错，欲知为何，待我看懂ConfigurationProperties咋起作用的
// 声明businessDataSource只作用于mapper路径下 @Configuration @MapperScan(basePackages = "com.rsb.activitispringboot.mapper", sqlSessionFactoryRef = "businessSqlSessionFactory") public class MybatisConfig { @Bean(name = "businessDataSource") @ConfigurationProperties(prefix = "spring.datasource.master") public DataSource businessDataSource() { return DataSourceBuilder.create().build(); } @Bean(name = "businessSqlSessionFactory") public SqlSessionFactory bizSqlSessionFactory(@Qualifier("businessDataSource") DataSource dataSource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(dataSource); bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/*.xml")); return bean.getObject(); } @Bean(name = "businessSqlSessionTemplate") public SqlSessionTemplate bizSqlSessionTemplate(@Qualifier("businessSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception { return new SqlSessionTemplate(sqlSessionFactory); } }
activiti和mybaits分别配置数据源
activiti自己继承了mybaits，其mapper没有暴露，所以不能使用以上方法配置。
ativiti7有一个配置数据源的类ProcessEngineAutoConfiguration
@Bean @ConditionalOnMissingBean // 不存在SpringProcessEngineConfiguration的bean的时候，才会注册这个bean public SpringProcessEngineConfiguration springProcessEngineConfiguration( DataSource dataSource, PlatformTransactionManager transactionManager, SpringAsyncExecutor springAsyncExecutor, ActivitiProperties activitiProperties, ProcessDefinitionResourceFinder processDefinitionResourceFinder, @Autowired(required = false) List\<ProcessEngineConfigurationConfigurer> processEngineConfigurationConfigurers, @Autowired(required = false) List\<ProcessEngineConfigurator> processEngineConfigurators) throws IOException { conf.setDataSource(dataSource); //...}也就是说同时存在mybaits的BusinessDatasource和ActivitiDatSource，而IOC容器单例模式不能有两个相同的bean，除非name不同，所以就有2种思路。
- mybatis配置别名，activiti不配置
- activiti配置别名，mybaits配置/不配置
1) mybatis配置别名，activiti不配置，这种方式简单，不用实现activiti的复杂编码。优先加载activiti的数据源
@Primary其作用与功能，当有多个相同类型的bean时，使用@Primary来赋予bean更高的优先级
@Configuration @MapperScan(basePackages = "com.rsb.activitispringboot.mapper", sqlSessionFactoryRef = "businessSqlSessionFactory") public class MybatisConfig { @Bean(name = "businessDataSource") @ConfigurationProperties(prefix = "spring.datasource.master") public DataSource businessDataSource() { return DataSourceBuilder.create().build(); } @Bean(name = "businessSqlSessionFactory") public SqlSessionFactory bizSqlSessionFactory(@Qualifier("businessDataSource") DataSource dataSource) throws Exception { SqlSessionFactoryBean bean = new SqlSessionFactoryBean(); bean.setDataSource(dataSource); bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/*.xml")); return bean.getObject(); } @Bean(name = "businessSqlSessionTemplate") public SqlSessionTemplate bizSqlSessionTemplate(@Qualifier("businessSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception { return new SqlSessionTemplate(sqlSessionFactory); } } @Configuration public class ActivitiConfig{ @Bean @Primary @ConfigurationProperties(prefix = "spring.activiti.datasource") public DataSource activitiDataSource() { return DataSourceBuilder.create().build(); } }2) activiti配置别名，mybaits不配置 / 不配置
mybatis配置同上，可以使用Qualifier 也可以使用@Primary，建议@Qualifier，清晰明了
@Configuration public class ActivitiConfig extends AbstractProcessEngineAutoConfiguration { @Bean("activitiDataSource") @ConfigurationProperties(prefix = "spring.activiti.datasource") public DataSource activitiDataSource() { return DataSourceBuilder.create().build(); } @Bean("activitiTransactionManager") public PlatformTransactionManager txManager(@Qualifier("activitiDataSource") DataSource dataSource) { return new DataSourceTransactionManager(dataSource); } @Bean public SpringProcessEngineConfiguration springProcessEngineConfiguration( @Qualifier("activitiDataSource") DataSource dataSource, @Qualifier("activitiTransactionManager") PlatformTransactionManager transactionManager, SpringAsyncExecutor springAsyncExecutor, ActivitiProperties activitiProperties, ProcessDefinitionResourceFinder processDefinitionResourceFinder, @Autowired(required = false) List\<ProcessEngineConfigurationConfigurer> processEngineConfigurationConfigurers, @Autowired(required = false) List\<ProcessEngineConfigurator> processEngineConfigurators) throws IOException { SpringProcessEngineConfiguration conf = new SpringProcessEngineConfiguration(); conf.setConfigurators(processEngineConfigurators); configureProcessDefinitionResources(processDefinitionResourceFinder,conf); conf.setDataSource(dataSource); conf.setTransactionManager(transactionManager); if (springAsyncExecutor != null) { conf.setAsyncExecutor(springAsyncExecutor); } conf.setDeploymentName(activitiProperties.getDeploymentName()); conf.setDatabaseSchema(activitiProperties.getDatabaseSchema()); >> conf.setDatabaseSchemaUpdate(activitiProperties.getDatabaseSchemaUpdate()); conf.setDbHistoryUsed(activitiProperties.isDbHistoryUsed()); conf.setAsyncExecutorActivate(activitiProperties.isAsyncExecutorActivate()); if (!activitiProperties.isAsyncExecutorActivate()) { ValidatorSet springBootStarterValidatorSet = new ValidatorSet("activiti-spring-boot-starter"); springBootStarterValidatorSet.addValidator(new AsyncPropertyValidator()); if (conf.getProcessValidator() == null) { ProcessValidatorImpl processValidator = new ProcessValidatorImpl(); processValidator.addValidatorSet(springBootStarterValidatorSet); conf.setProcessValidator(processValidator); } else { conf.getProcessValidator().getValidatorSets().add(springBootStarterValidatorSet); } } conf.setMailServerHost(activitiProperties.getMailServerHost()); conf.setMailServerPort(activitiProperties.getMailServerPort()); conf.setMailServerUsername(activitiProperties.getMailServerUserName()); conf.setMailServerPassword(activitiProperties.getMailServerPassword()); conf.setMailServerDefaultFrom(activitiProperties.getMailServerDefaultFrom()); conf.setMailServerUseSSL(activitiProperties.isMailServerUseSsl()); conf.setMailServerUseTLS(activitiProperties.isMailServerUseTls()); conf.setUserGroupManager(userGroupManager); conf.setHistoryLevel(activitiProperties.getHistoryLevel()); conf.setCopyVariablesToLocalForTasks(activitiProperties.isCopyVariablesToLocalForTasks()); conf.setSerializePOJOsInVariablesToJson(activitiProperties.isSerializePOJOsInVariablesToJson()); conf.setJavaClassFieldForJackson(activitiProperties.getJavaClassFieldForJackson()); if (activitiProperties.getCustomMybatisMappers() != null) { conf.setCustomMybatisMappers( getCustomMybatisMapperClasses(activitiProperties.getCustomMybatisMappers())); } if (activitiProperties.getCustomMybatisXMLMappers() != null) { conf.setCustomMybatisXMLMappers(new HashSet<>(activitiProperties.getCustomMybatisXMLMappers())); } if (activitiProperties.getCustomMybatisXMLMappers() != null) { conf.setCustomMybatisXMLMappers(new HashSet<> activitiProperties.getCustomMybatisXMLMappers())); } if (activitiProperties.isUseStrongUuids()) { conf.setIdGenerator(new StrongUuidGenerator()); } if (activitiProperties.getDeploymentMode() != null) { conf.setDeploymentMode(activitiProperties.getDeploymentMode()); } conf.setActivityBehaviorFactory(new DefaultActivityBehaviorFactory()); if (processEngineConfigurationConfigurers != null) { for (ProcessEngineConfigurationConfigurer processEngineConfigurationConfigurer : processEngineConfigurationConfigurers) { processEngineConfigurationConfigurer.configure(conf); } } return conf; } private void configureProcessDefinitionResources( ProcessDefinitionResourceFinder processDefinitionResourceFinder, SpringProcessEngineConfiguration conf) throws IOException { List<Resource> procDefResources = processDefinitionResourceFinder.discoverProcessDefinitionResources(); if (!procDefResources.isEmpty()) { conf.setDeploymentResources(procDefResources.toArray(new Resource\[0])); } } }
