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土豆 edited this page Jul 20, 2017 · 26 revisions

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Welcome everyone to use Druid, FAQ answers here, we want to help.

1. What is Druid?

Druid is the best database connection pool in JAVA. Druid provides powerful monitoring and extended functionality.

2. Where to download?

3. how to get the source code

Driud is an open source project, hosting on github, source code repository: https://github.com/alibaba/druid

4. maven config

since 0.1.18, druid deploy to maven central repository, so you only need to add the dependency to the pom.xml, such as:

	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid</artifactId>
		<version>${druid-version}</version>
	</dependency>

5. how to use Druid's monitoring feature?

Druid monitoring feature is implementation by filter-chain, if you want turn on, config StatFilter, look here : https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE_StatFilter

6. how to use Druid buit-in monitoring page

built-in monitoring page is a Servlet, configuration see here : https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE_StatViewServlet%E9%85%8D%E7%BD%AE

7. how to configure Web and Spring related monitoring？

8. how to configure the defense against SQL injection attacks

Druid provides WallFilter, it is based on the SQL semantic analysis to defense SQL injection attacks, see here : https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE-wallfilter

9. DruidDataSource reference configuration

different needs of different business scenarios, you can use our reference configuration, but it recommended that you carefully read the documentation to understand clearly do custom configuration.

https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE_DruidDataSource%E5%8F%82%E8%80%83%E9%85%8D%E7%BD%AE

10. I would like to logging SQL execution, how to config?

Druid provides Log4jFilter/CommonsLogFilter/Slf4jFilter, see here : https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE_LogFilter

11. my program may be have connection leaks, how to do?

Druid offers a variety of means to monitoring connection leaks, see here : https://github.com/alibaba/druid/wiki/%E8%BF%9E%E6%8E%A5%E6%B3%84%E6%BC%8F%E7%9B%91%E6%B5%8B

12. Solve the problem of excessive memory footprint Oracle PSCache

Connect to an Oracle database, other connection pool will exist the problem of excessive memory usage, Druid is the only connection pool to solve this problem. see here : http://code.alibabatech.com/wiki/pages/viewpage.action?pageId=6951277

13. Druid and other connection pool comparison?

14. what to pay attention to migration from other connection pool?

15. Similar Jboss DataSource ExceptionSorter in Druid

ExceptionSorter is one of the outstanding features of JBoss DataSource, Druid has the same funtion of ExceptionSorter, but do not have to manually configure it take effect automatically. see here : http://code.alibabatech.com/wiki/display/Druid/ExceptionSorter

16. why maxIdle properties is useless?

the maxIdle property for Druid compatible with DBCP, maxIdle is a confusing concept. the connection pool should only maxPoolSize and minPoolSize，druid retain only maxActive and minIdle, respectively the equivalent maxPoolSize and minPoolSize.

17. To use DruidDataSource in JNDI?

DruidDataSource support JNDI, see here : http://code.alibabatech.com/wiki/pages/viewpage.action?pageId=2916633
the concrete implementation of the class is this : com.alibaba.druid.pool.DruidDataSourceFactory, you can read the code to deep understanding.

18. my application has been used DBCP, is dead code written, how to replacement for Druid?

Druid provides a completely smooth migration DBCP way.

In this usage, making Druid can be used in existing applications such as sonar, sonar is web application written in ruby, write dead DBCP, only through this method to replace.

19. I'd like try a version of snapshots, how to do?

see here : http://code.alibabatech.com/mvn/snapshots/com/alibaba/druid/

20. Some SQL execution is very slow, and I hope that a log record, how to do?

In StatFilter slow SQL execution logging configuration, see here : https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE_StatFilter

21. I want to encrypt the database password, how to do?

DBA does not want to directly write the password in the config file, Druid provide the features that encrypted database password. see here : https://github.com/alibaba/druid/wiki/%E4%BD%BF%E7%94%A8ConfigFilter

22. How to participate in the development of Druid?

Druid is an open source project, hosted on github.com, you can "pull request". see here : https://github.com/alibaba/druid/wiki/%E5%A6%82%E4%BD%95%E5%8F%82%E4%B8%8E

23. Welcome discuss and improvement !

(Welcome to join QQ Group: 240619787 for discuss and study Druid)

24. How to integrate the Druid connection pool and monitoring in Spring Boot project?

Use Druid Spring Boot Starter，Documentation：https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter

25. How to add custom WallConfig, Filter in the Spring Boot ?

  1. add configuration properties
spring.datasource.druid.wall.config.multiStatementAllow=false
spring.datasource.druid.wall.config.truncateAllow=true
... other
  1. Use Druid Spring Boot Starter DruidDataSourceBuilder 
@Bean
@ConfigurationProperties("spring.datasource.druid.wall.config")
public WallConfig wallConfig(){
    return new WallConfig();
}

@Bean
public WallFilter wallFilter(){
    WallFilter filter = new WallFilter();
    filter.setConfig(wallConfig());
    filter.setDbType("mysql");
    return filter;
}

@Bean
public DataSource dataSource(Environment env){
    DruidDataSource dataSource = DruidDataSourceBuilder
            .create()
            .build(env,"spring.datasource.druid.");
    List<Filter> filters = new ArrayList<>();
    filters.add(wallFilter());
    dataSource.setProxyFilters(filters);
    return dataSource;
}
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