Spring Boot 整合mybatis 使用多数据源

本人想要实现一个项目里面多个数据库源连接，所以就尝试写一个demo，不多说，先贴结构，再贴代码，可以根据以下的顺序，直接copy解决问题。

首先，dao和resource下的mappers可以用mybatis-generator-maven-plugin插件自动生成，用法可以自己查看，这里不说了。

1.Application.java源码

@SpringBootApplication(exclude = {
        DataSourceAutoConfiguration.class
})
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

exlude实现不自动注入spring.mybatis默认的配置信息

2.config包

a.DataSourceConfig.java

@Configuration
public class DataSourceConfig {
    @Bean(name = "HTTags")
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource.HTTags")
    public DataSource dataSourceA() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "DBHTNews")
    @ConfigurationProperties(prefix = "spring.datasource.DBHTNews")
    public DataSource dataSourceB() {
        return DataSourceBuilder.create().build();
    }
}

我这里需要实现两个不同的库之间的操作，所以建立这个DataSourceConfig，从application.properties里面读取不同配置信息，返回新的DataSource。

b.MybatisDataBaseAConfig.java

@Configuration
@MapperScan(basePackages = {"com.htsec.sync.tag.manager.dao.httags"}, sqlSessionFactoryRef = "sqlSessionFactory1", sqlSessionTemplateRef = "sqlSessionTemplate1")
public class MybatisDataBaseAConfig {

    @Autowired
    @Qualifier("HTTags")
    private DataSource ds1;

    /**
     * //参数传入：@Qualifier("httags") DataSource ds1
     *
     * @return
     * @throws Exception
     */
    @Bean
    public SqlSessionFactory sqlSessionFactory1() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(ds1);
        //添加XML目录
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        try {
            //解决org.apache.ibatis.binding.BindingException: Invalid bound statement (not found):异常
            factoryBean.setMapperLocations(resolver.getResources("classpath:mappers/httags/*.xml"));
            return factoryBean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * //参数传入：@Qualifier("sqlSessionFactory1") SqlSessionFactory sqlSessionFactory
     *
     * @return
     * @throws Exception
     */
    @Bean
    public SqlSessionTemplate sqlSessionTemplate1() throws Exception {
        SqlSessionTemplate sessionTemplate = new SqlSessionTemplate(sqlSessionFactory1());
        return sessionTemplate;
    }
}

此处注意有坑，一定把mappersan写好，还要注意resource下的mappers地址配置。

c.MybatisDataBaseBConfig.java

@Configuration
@MapperScan(basePackages = {"com.htsec.sync.tag.manager.dao.htnews"}, sqlSessionFactoryRef = "sqlSessionFactory2", sqlSessionTemplateRef = "sqlSessionTemplate2")
public class MybatisDataBaseBConfig {

    @Autowired
    @Qualifier("DBHTNews")
    private DataSource ds1;

    /**
     * //参数传入：@Qualifier("httags") DataSource ds1
     *
     * @return
     * @throws Exception
     */
    @Bean
    public SqlSessionFactory sqlSessionFactory2() throws Exception {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(ds1);
        //添加XML目录
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        try {
            factoryBean.setMapperLocations(resolver.getResources("classpath:mappers/htnews/*.xml"));
            return factoryBean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * //参数传入：@Qualifier("sqlSessionFactory1") SqlSessionFactory sqlSessionFactory
     *
     * @return
     * @throws Exception
     */
    @Bean
    public SqlSessionTemplate sqlSessionTemplate2() throws Exception {
        SqlSessionTemplate sessionTemplate = new SqlSessionTemplate(sqlSessionFactory2());
        return sessionTemplate;
    }
}

sqlSessionFactory和sqlSessionTemplate命名一定要和上面那个不一样。

3.application.properties

# HTTags
spring.datasource.HTTags.url=jdbc:sqlserver://x.x.x.x:1433;DatabaseName=HTTags
spring.datasource.HTTags.username=sa
spring.datasource.HTTags.password=password
spring.datasource.HTTags.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver

# DBHTNews
spring.datasource.DBHTNews.url=jdbc:sqlserver://x.x.x.x:1433;DatabaseName=HTNews
spring.datasource.DBHTNews.username=sa
spring.datasource.DBHTNews.password=password
spring.datasource.DBHTNews.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver

4.pom.xml

<dependencies>
        <!-- springframework -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <!-- spring boot test -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <!-- org.mybatis.spring.boot -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.0</version>
        </dependency>

        <!-- sql server jdbc -->
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>sqljdbc4</artifactId>
            <version>4.0</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
            </plugin>
        </plugins>
    </build>

就这么多吧。