SpringBoot使用mybatis,发生:Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured
最近,配置项目,使用SpringBoot2.2.1,配置mybatis访问db,配好后,使用自定义的数据源。启动发生:
APPLICATION FAILED TO START
*************************** Description: Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured. Reason: Failed to determine a suitable driver class Action: Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).
虽然,我知道,是因为我没有在application.yml文件中配置:spring.datasource。但是因为我是自定义的数据源,配置项不在spring.datasource,所以希望,不配置spring.datasource,也能启动项目。单纯在@SpringBootApplication(exclude = {DataSourceAutoConfigure.class})中排除DataSourceAutoConfigure是不行的。
下面是解决方案:
方案1:
在自定义数据源中,添加自定义自动配置类。见下面的例子:
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy; import javax.annotation.Resource;
import javax.sql.DataSource;
import java.util.Properties; /**
* 自定义自动配置类
* 1. 自定义数据源,自定义数据源是为了,防止因为没有在配置文件中,配置spring.datasource,
* 出现:Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
* 2. 切面类,用来切换主从数据源
*
*/
@EnableAspectJAutoProxy
@Configuration
public class CustomDataSourceAutoConfiguration { @Bean
@ConditionalOnMissingBean
public DataSource defaultDataSource() {
return new CustomDataSource());
}
} @Bean
@ConditionalOnBean({DataSource.class})
public CustomDataSourceAspect CustomDsAspect() {
return new CustomDataSourceAspect();
}
}
别忘了,在META-INF/spring.factories文件中配置:
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.xxx.framework.datasource.masterslave.CustomDataSourceAutoConfiguration
方案2:
在启动类上,添加如下代码:
import com.lzj.framework.datasource.multi.MultiDatabaseMapperFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration; @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
@MapperScan(basePackages = {"com.xxx.test.dao"}, factoryBean = MultiDatabaseMapperFactoryBean.class)
public class LzjFrameworkTestApplication { public static void main(String[] args) {
SpringApplication.run(LzjFrameworkTestApplication.class, args);
} }
第一要在@SpringBootApplication中排除DataSourceAutoConfiguration类的配置;第二,要配置@MapperScan,在参数中指出,扫描标准@Mapper注解的dao接口的包位置,和自定义factoryBean的实现类。factoryBean需要自己实现,需要继承MapperFactoryBean接口。
当然,你要是不使用数据库,只需把DataSourceAutoConfiguration排除就可以了。
项目,就可以正常启动了。
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