springboot+mybatis多數據源配置

配置文件

pom包依賴配置：

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>${mybatis-spring-boot-starter.version}</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>${druid.version}</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>${mysql-connector-java.version}</version>
</dependency>
<properties>
    <mysql-connector-java.version>5.1.34</mysql-connector-java.version>
    <druid.version>1.0.18</druid.version>
    <mybatis-spring-boot-starter.version>1.1.1</mybatis-spring-boot-starter.version>
</properties>

數據庫配置：

druid.url=jdbc:mysql://localhost:3306/test1?useSSL=false&useUnicode=true&characterEncoding=utf-8
druid.driver-class=com.mysql.jdbc.Driver
druid.username=root
druid.password=root

druid2.url=jdbc:mysql://localhost:3306/test2?useSSL=false&useUnicode=true&characterEncoding=utf-8
druid2.driver-class=com.mysql.jdbc.Driver
druid2.username=root
druid2.password=root

一個test1庫和一個test2庫，其中test1位主庫，在使用的過程中必須指定主庫，不然會報錯。

數據源配置@Configuration

@MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")
public class DataSource1Config {

    @Bean(name = "test1DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "test1SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
        return bean.getObject();
    }

    @Bean(name = "test1TransactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "test1SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

@Configuration
@MapperScan(basePackages = "com.neo.mapper.test2", sqlSessionTemplateRef  = "test2SqlSessionTemplate")
public class DataSource1Config {


    @Bean(name = "test2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test2")
    @Primary
    public DataSource testDataSource() {
        return DataSourceBuilder.create().build();
    }


    @Bean(name = "test2SqlSessionFactory")
    @Primary
    public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource) throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test2/*.xml"));
        return bean.getObject();
    }


    @Bean(name = "test2TransactionManager")
    @Primary
    public DataSourceTransactionManager testTransactionManager(@Qualifier("test2DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }


    @Bean(name = "test2SqlSessionTemplate")
    @Primary
    public SqlSessionTemplate testSqlSessionTemplate(@Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }


}

最關鍵的地方就是這塊了，一層一層注入,先創建DataSource，在創建SqlSessionFactory在創建事務，最後包裝到SqlSessionTemplate中。其中需要制定分庫的mapper文件地址，以及分庫到層代碼。

@MapperScan(basePackages = "com.neo.mapper.test1", sqlSessionTemplateRef  = "test1SqlSessionTemplate")
@MapperScan(basePackages = "com.neo.mapper.test2", sqlSessionTemplateRef  = "test2SqlSessionTemplate")

這塊的註解就是指明瞭掃描dao層，並且給dao層注入指定的SqlSessionTemplate。所有@Bean都需要按照命名指定正確。

啓動測試

@SpringBootApplication
public class Application {
    /**
     * 方法描述:啓動程序
     * 
     * @author leon 2018年3月23日 下午8:07:50
     * @param args
     */
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}