在开发中,动态数据源配置还是用的比较多的,比如在多数据源使用方面,又或者是在多个DB之间切换方面。这里给出一个动态数据源的配置方案,两个DB均以mysql为例。
多数据源配置引入
mybatis和mysql在springboot中的引入这里就不在说了,不了解的可以参见springboot中mysql与mybatis的引入。
数据源配置如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
|
datasource:
master:
type: com.alibaba.druid.pool.DruidDataSource
jdbc-url: jdbc:mysql://127.0.0.1:3306/sbac_master?autoReconnect=true&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
username: root
password: 1234
driver-class-name: com.mysql.cj.jdbc.Driver
log:
type: com.alibaba.druid.pool.DruidDataSource
jdbc-url: jdbc:mysql://127.0.0.1:3306/sbac_log?autoReconnect=true&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
username: root
password: 1234
driver-class-name: com.mysql.cj.jdbc.Driver
|
mybatis的配置引入如下:
1
2
3
|
mybatis:
config-location: classpath:mybatis-config.xml
mapper-locations: classpath:com/lazycece/sbac/mysql/data/dao/*/mapper/*.xml
|
这里已然使用的是springboot的自动配置功能配置mybatis信息,只是手动指定了数据源的。如下所示,指定了master和log两个数据源,设置master为默认数据源:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
@Configuration
public class MultiDataSource {
public static final String MASTER_DATA_SOURCE = "masterDataSource" ;
public static final String LOG_DATA_SOURCE = "logDataSource" ;
@Bean (name = MultiDataSource.MASTER_DATA_SOURCE)
@ConfigurationProperties (prefix = "datasource.master" )
public DataSource masterDataSource() {
return DataSourceBuilder.create().build();
}
@Bean (name = MultiDataSource.LOG_DATA_SOURCE)
@ConfigurationProperties (prefix = "datasource.log" )
public DataSource logDataSource() {
return DataSourceBuilder.create().build();
}
@Primary
@Bean (name = "dynamicDataSource" )
public DynamicDataSource dataSource() {
DynamicDataSource dynamicDataSource = new DynamicDataSource();
dynamicDataSource.setDefaultTargetDataSource(masterDataSource());
Map<Object, Object> dataSourceMap = new HashMap<>( 4 );
dataSourceMap.put(MASTER_DATA_SOURCE, masterDataSource());
dataSourceMap.put(LOG_DATA_SOURCE, logDataSource());
dynamicDataSource.setTargetDataSources(dataSourceMap);
return dynamicDataSource;
}
}
|
动态数据源路由实现
引入了配置信息之后,便是该说如何实现多数据源切换了。我们是通过实现AbstractRoutingDataSource类的determineCurrentLookupKey方法来实现数据源的动态路由,设置ThreadLocal线程保护变量存储数据源key,确保线程间不受影响。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
package com.lazycece.sbac.mysql.multi.config;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
/**
* @author lazycece
*/
public class DynamicDataSource extends AbstractRoutingDataSource {
private static final Logger LOGGER = LoggerFactory.getLogger(DynamicDataSource. class );
private static final ThreadLocal<String> DATA_SOURCE_KEY = new ThreadLocal<>();
static void changeDataSource(String dataSourceKey) {
DATA_SOURCE_KEY.set(dataSourceKey);
}
static void clearDataSource() {
DATA_SOURCE_KEY.remove();
}
@Override
protected Object determineCurrentLookupKey() {
String key = DATA_SOURCE_KEY.get();
LOGGER.info( "current data-source is {}" , key);
return key;
}
}
|
随后,便是用AOP的方式来实现数据源的动态切换,注解和切面定义如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
@Documented
@Inherited
@Retention (RetentionPolicy.RUNTIME)
@Target ({ElementType.METHOD, ElementType.TYPE})
public @interface DataSource {
String value();
}
@Component
@Aspect
public class DataSourceConfig {
@Before ( "@annotation(dataSource)" )
public void beforeSwitchDataSource(DataSource dataSource) {
DynamicDataSource.changeDataSource(dataSource.value());
}
@After ( "@annotation(DataSource)" )
public void afterSwitchDataSource() {
DynamicDataSource.clearDataSource();
}
}
|
动态数据源切换使用
动态数据源切换只需要在业务中使用@DataSource注解来标明需要使用的数据源即可,如下所示(这里只贴出关键代码):
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
@Service
public class DynamicDataSourceServiceImpl implements DynamicDataSourceService {
@Resource
private UserDao userDao;
@Resource
private SystemLogDao systemLogDao;
@Override
@DataSource (value = MultiDataSource.MASTER_DATA_SOURCE)
public void addUserInfo(User user) {
userDao.insert(user);
}
@Override
@DataSource (value = MultiDataSource.MASTER_DATA_SOURCE)
public User getUserInfo(String username) {
return userDao.findByUsername(username);
}
@Override
@DataSource (value = MultiDataSource.LOG_DATA_SOURCE)
public void addSystemLog(SystemLog systemLog) {
systemLogDao.insert(systemLog);
}
@Override
@DataSource (value = MultiDataSource.LOG_DATA_SOURCE)
public List<SystemLog> getSystemLogInfo(Date beginTime, Date endTime) {
return systemLogDao.findByCreateTime(beginTime, endTime);
}
}
|
案例源码
案例源码地址: https://github.com/lazycece/springboot-actual-combat/tree/master/springboot-ac-mysql/springboot-ac-mysql-multi
到此这篇关于springboot中mybatis多数据源动态切换实现的文章就介绍到这了,更多相关springboot mybatis多数据源动态切换内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家!
原文链接:https://juejin.cn/post/6987013765480841246