大致的步骤分为以下几部：
一、搭建springboot环境，这里不做介绍。
二、假设需要同时支持mysql和oracle数据库，我的配置文件如下：
三、通过spring加载多数据源，代码如下：
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import javax.sql.DataSource;
@Configuration
public class DataSourceConfig {
@Bean(name ="jpaDataSource")
@Qualifier("jpaDataSource")
@Primary
@ConfigurationProperties(prefix ="spring.datasource.mysql")
public DataSource jpaDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name ="mybatisDataSource")
@Qualifier("mybatisDataSource")
@ConfigurationProperties(prefix ="spring.datasource.mysql")
public DataSource mybatisDataSource() {
return DataSourceBuilder.create().build();
}
}
至此，jpa和mybatis均能加载，接下来分表配置jap和mybatis各自的启动类。
四、jpa启动类
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
/**
* Created by dingwei.
**/
@Configuration
@EnableJpaRepositories(entityManagerFactoryRef ="jpaEntityManagerFactory",
transactionManagerRef ="jpaTransactionManager",
basePackages ="com.ztsmart.search.core.repository")
@EnableTransactionManagement
public class JPAConfig {
@Autowired
@Qualifier("jpaDataSource")
private DataSourcejpaDataSource;
@Bean(name ="jpaEntityManager")
@Primary
public EntityManager entityManager() {
return entityManagerFactory().getObject().createEntityManager();
}
@Bean(name ="jpaEntityManagerFactory")
@Primary
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
HibernateJpaVendorAdapter japVendor =new HibernateJpaVendorAdapter();
japVendor.setGenerateDdl(false);
LocalContainerEntityManagerFactoryBean entityManagerFactory =new LocalContainerEntityManagerFactoryBean();
entityManagerFactory.setDataSource(jpaDataSource);
entityManagerFactory.setJpaVendorAdapter(japVendor);
entityManagerFactory.setPackagesToScan("com.ztsmart.search.*.entity");
return entityManagerFactory;
}
@Bean(name ="jpaTransactionManager")
@Primary
public PlatformTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
JpaTransactionManager manager =new JpaTransactionManager();
manager.setEntityManagerFactory(entityManagerFactory);
return manager;
}
@Bean
public BeanPostProcessor persistenceTranslation() {
return new PersistenceAnnotationBeanPostProcessor();
}
}
注：basePackages为你的repository所在包，可配置多个包；PackagesToScan必须扫描到实体类。
四、mybatis启动类
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
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 org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages ="com.ztsmart.search.*.mapper", sqlSessionFactoryRef ="mybatisSessionFactory")
@EnableTransactionManagement
public class MybatisDataSourceConfig {
private static final StringMAPPER_LOCATION ="classpath*:mybatis/*.xml";
@Autowired
@Qualifier("mybatisDataSource")
private DataSourcemybatisDataSource;
@Bean(name ="mybatisTransactionManager")
public DataSourceTransactionManager masterTransactionManager() {
return new DataSourceTransactionManager(mybatisDataSource);
}
@Bean(name ="mybatisSessionFactory")
public SqlSessionFactory mybatisSessionFactory()
throws Exception {
//解决查询返回结果含null没有对应字段值问题
org.apache.ibatis.session.Configuration configuration =new org.apache.ibatis.session.Configuration();
configuration.setCallSettersOnNulls(true);
//configuration.setMapUnderscoreToCamelCase(true);
final SqlSessionFactoryBean sessionFactory =new SqlSessionFactoryBean();
sessionFactory.setDataSource(mybatisDataSource);
sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
.getResources(MybatisDataSourceConfig.MAPPER_LOCATION));
sessionFactory.setConfiguration(configuration);
return sessionFactory.getObject();
}
@Bean
public SqlSessionTemplate sqlSessionTemplate()throws Exception {
return new SqlSessionTemplate(mybatisSessionFactory());
}
}
注：这里basePackages需扫描到相关的mapper，可配置多个。相关的xml文件必须放置到resources/mybatis文件中，这样各模块下的xml均能扫描。
至此，支持jap和mybatis配置完成，如果需同时支持多数源需修改第三步加载配置源启动类即可。