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环境说明
- Spring Boot 1.5.17.RELEASE
或Spring Boot 2.1.0.RELEASE - MySQL v5.6.19
- PostgreSQL v10.4
无特殊说明，以下所说的环境均指
Spring Boot 2.1.0.RELEASE，如果使用的是Spring Boot 1.5.17.RELEASE这个版本，只需要调整下面有做说明的几处地方
连接配置
在application.yml中定义如下信息：
spring:
jpa:
hibernate:
# 多数据源下，该属性不生效，需要在配置中额外指定，这里仅表示普通定义
ddl-auto: create-drop
properties:
hibernate:
show_sql: true
format_sql: true
jdbc:
lob:
non_contextual_creation: true
open-in-view: false
# 定义不同数据源的连接信息
datasource:
hikari:
mysql:
# Spring Boot 1.0+ 版本：使用spring.datasource.url
# Spring Boot 2.0+ 版本：使用spring.datasource.hikari.jdbc-url
jdbc-url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT%2B8
username: root
password: root
# Spring Boot 1.0+ 版本：使用com.mysql.jdbc.Driver
# Spring Boot 2.0+ 版本：使用com.mysql.cj.jdbc.Driver
driver-class-name: com.mysql.cj.jdbc.Driver
postgres:
jdbc-url: jdbc:postgresql://localhost:5432/postgres
username: postgres
password: postgres
driver-class-name: org.postgresql.Driver
配置数据源
根据上面定义的配置信息，配置这两个数据源：
// Spring Boot 1.0+ ，DataSourceBuilder所在包位置为：org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder
// Spring Boot 2.0+ ，DataSourceBuilder所在包位置为：org.springframework.boot.jdbc.DataSourceBuilder
@Configuration
public class DataSourceConfig {
@Primary
@Bean
@ConfigurationProperties("spring.datasource.hikari.mysql")
public DataSource mysqlDataSource() {
return DataSourceBuilder.create().build();
}
@Bean
@ConfigurationProperties("spring.datasource.hikari.postgres")
public DataSource postgresDataSource() {
return DataSourceBuilder.create().build();
}
}
Mybatis 支持
添加 mysql 对应数据源的 Mybatis 支持：
@Configuration
@MapperScan(
// 数据层所在包位置
basePackages = "cn.mariojd.springboot.multiple.datasource.mybatis.mysql.mapper",
sqlSessionTemplateRef = "mybatisMysqlSqlSessionTemplate")
public class MybatisMysqlDataSourceConfig {
@Resource
@Qualifier("mysqlDataSource")
private DataSource dataSource;
@Bean
@Primary
public SqlSessionFactory mybatisMysqlSqlSessionFactory() throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource);
// 如果是xml形式，需要在此处指定mapper位置
// factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mysql/mapper/*.xml"));
return factoryBean.getObject();
}
@Bean
@Primary
public DataSourceTransactionManager mybatisMysqlTransactionManager() {
return new DataSourceTransactionManager(dataSource);
}
@Bean
@Primary
public SqlSessionTemplate mybatisMysqlSqlSessionTemplate(@Qualifier("mybatisMysqlSqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
添加 postgres 对应数据源的 Mybatis 支持：
@Configuration
@MapperScan(
// 数据层所在包位置
basePackages = "cn.mariojd.springboot.multiple.datasource.mybatis.postgres.mapper",
sqlSessionTemplateRef = "mybatisPostgresSqlSessionTemplate")
public class MybatisPostgresDataSourceConfig {
@Resource
@Qualifier("postgresDataSource")
private DataSource dataSource;
@Bean
public SqlSessionFactory mybatisPostgresSqlSessionFactory() throws Exception {
SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
factoryBean.setDataSource(dataSource);
// 如果是xml形式，需要在此处指定mapper位置
// factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/postgres/mapper/*.xml"));
return factoryBean.getObject();
}
@Bean
public DataSourceTransactionManager mybatisPostgresTransactionManager() {
return new DataSourceTransactionManager(dataSource);
}
@Bean
public SqlSessionTemplate mybatisPostgresSqlSessionTemplate(@Qualifier("mybatisPostgresSqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
相关定义
mysql 对应的数据源配置中，定义了实体 Boy 和对应的数据层接口 BoyMapper：
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Boy {
private Integer id;
private String name;
}
public interface BoyMapper {
@Insert("INSERT INTO boy(id,name) VALUES(#{boy.id},#{boy.name})")
@Options(useGeneratedKeys = true, keyProperty = "boy.id")
int insert(@Param("boy") Boy boy);
@Select("SELECT id,name FROM boy")
@Results({
@Result(property = "id", column = "id", javaType = Integer.class, jdbcType = JdbcType.INTEGER),
@Result(property = "name", column = "name", javaType = String.class, jdbcType = JdbcType.VARCHAR),
})
List<Boy> findAll();
}
postgres 对应的数据源配置中，定义了实体 Girl 和对应的数据层接口 GirlMapper：
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Girl {
private Integer id;
private String name;
}
public interface GirlMapper {
@Insert("INSERT INTO girl(id,name) VALUES(#{girl.id},#{girl.name})")
@Options(useGeneratedKeys = true, keyProperty = "girl.id")
int insert(@Param("girl") Girl girl);
@Select("SELECT id,name FROM girl")
@Results({
@Result(property = "id", column = "id", javaType = Integer.class, jdbcType = JdbcType.INTEGER),
@Result(property = "name", column = "name", javaType = String.class, jdbcType = JdbcType.VARCHAR),
})
List<Girl> findAll();
}
单元测试
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootMybatisMultipleDataSourceTest {
@Resource
private BoyMapper boyMapper;
@Resource
private GirlMapper girlMapper;
@Test
public void test() {
boyMapper.insert(new Boy(1, "大肖"));
boyMapper.insert(new Boy(2, "大熊"));
Assert.assertEquals(2, boyMapper.findAll().size());
girlMapper.insert(new Girl(1, "小红"));
girlMapper.insert(new Girl(2, "小花"));
Assert.assertEquals(2, girlMapper.findAll().size());
}
}
示例源码
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