由于服务没有做微服务部署，需要在后台管理系统访问其他服务的库，所以需要用到动态数据源切换
引入依赖
mybatis-plus动态数据源依赖
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
<version>3.5.1</version>
</dependency>更改配置
spring:
application:
name: appName
datasource:
dynamic:
# 指定默认数据源
primary: aaaa1
strict: false
datasource:
# 配置第一个数据源
aaaa1:
driverClassName: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://host:3306/xxx?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true
username: username
password: password
# 配置第二个数据源
aaaa2:
driverClassName: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://host:3306/xxx?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true
username: username
password: password
druid:
# 初始连接数
initialSize: 5
# 最小连接池数量
minIdle: 10
# 最大连接池数量
maxActive: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
minEvictableIdleTimeMillis: 300000
# 配置一个连接在池中最大生存的时间，单位是毫秒
maxEvictableIdleTimeMillis: 900000
# 配置检测连接是否有效
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
webStatFilter:
enabled: true
statViewServlet:
enabled: true
# 设置白名单，不填则允许所有访问
allow:
url-pattern: /druid/*
# 控制台管理用户名和密码
# login-username: login-username
# login-password: login-password
filter:
stat:
enabled: true
# 慢SQL记录
log-slow-sql: true
slow-sql-millis: 1000
merge-sql: true
wall:
config:
multi-statement-allow: true配置类
package com.ruoyi.framework.config;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import com.ruoyi.common.utils.StringUtils;
import org.apache.ibatis.io.VFS;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.boot.autoconfigure.SpringBootVFS;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.util.ClassUtils;
import javax.sql.DataSource;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
/**
* Mybatis支持*匹配扫描包
*
* @author ruoyi
*/
@Configuration
public class MyBatisConfig {
@Autowired
private Environment env;
static final String DEFAULT_RESOURCE_PATTERN = "**/*.class";
public static String setTypeAliasesPackage(String typeAliasesPackage) {
ResourcePatternResolver resolver = (ResourcePatternResolver) new PathMatchingResourcePatternResolver();
MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resolver);
List<String> allResult = new ArrayList<String>();
try {
for (String aliasesPackage : typeAliasesPackage.split(",")) {
List<String> result = new ArrayList<String>();
aliasesPackage = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX
+ ClassUtils.convertClassNameToResourcePath(aliasesPackage.trim()) + "/" + DEFAULT_RESOURCE_PATTERN;
Resource[] resources = resolver.getResources(aliasesPackage);
if (resources != null && resources.length > 0) {
MetadataReader metadataReader = null;
for (Resource resource : resources) {
if (resource.isReadable()) {
metadataReader = metadataReaderFactory.getMetadataReader(resource);
try {
result.add(Class.forName(metadataReader.getClassMetadata().getClassName()).getPackage().getName());
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
}
if (result.size() > 0) {
HashSet<String> hashResult = new HashSet<String>(result);
allResult.addAll(hashResult);
}
}
if (allResult.size() > 0) {
typeAliasesPackage = String.join(",", (String[]) allResult.toArray(new String[0]));
} else {
throw new RuntimeException("mybatis typeAliasesPackage 路径扫描错误,参数typeAliasesPackage:" + typeAliasesPackage + "未找到任何包");
}
} catch (IOException e) {
e.printStackTrace();
}
return typeAliasesPackage;
}
public Resource[] resolveMapperLocations(String[] mapperLocations) {
ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();
List<Resource> resources = new ArrayList<Resource>();
if (mapperLocations != null) {
for (String mapperLocation : mapperLocations) {
try {
Resource[] mappers = resourceResolver.getResources(mapperLocation);
resources.addAll(Arrays.asList(mappers));
} catch (IOException e) {
// ignore
}
}
}
return resources.toArray(new Resource[resources.size()]);
}
@Bean
public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
String typeAliasesPackage = env.getProperty("mybatis.typeAliasesPackage");
String mapperLocations = env.getProperty("mybatis.mapperLocations");
String configLocation = env.getProperty("mybatis.configLocation");
typeAliasesPackage = setTypeAliasesPackage(typeAliasesPackage);
VFS.addImplClass(SpringBootVFS.class);
// 注意这里使用的是MybatisSqlSessionFactoryBean而不是SqlSessionFactoryBean
final MybatisSqlSessionFactoryBean sessionFactory = new MybatisSqlSessionFactoryBean();
sessionFactory.setDataSource(dataSource);
sessionFactory.setTypeAliasesPackage(typeAliasesPackage);
sessionFactory.setMapperLocations(resolveMapperLocations(StringUtils.split(mapperLocations, ",")));
sessionFactory.setConfigLocation(new DefaultResourceLoader().getResource(configLocation));
sessionFactory.setPlugins(new MybatisSqlLoggerInterceptor());
return sessionFactory.getObject();
}
}添加注解
@DS注解我一般放在dao层，因为觉得这样更合理,如果使用了BaseMapper的批量处理以及接口操作，可以将注解放在service层解决找不到数据库问题
启动测试
问题：
动态数据源切换时效
当服务层接口添加事务注解，动态数据源切换就会失效，并且会使用默认的主数据源
批量处理接口异常
当dao层具体实现继承了BaseMapper并且服务处使用IService去实现，在批量处理时候就会出现异常，此时可以通过更改配置解决
使用 MybatisSqlSessionFactoryBean 替换 SqlSessionFactoryBean
参开原文：mybatis-plus框架TABLE_INFO_CACHE获取不到对应的TableInfo对象_error: can not execute. because can not find cache-CSDN博客
另一种方式实现(未测试)：https://www.cnblogs.com/zhaww/p/12706941.html
根据Mybatis-plus配置动态数据源-从数据库获取源_mybatis plus 拦截器怎么获取当前数据库类型-CSDN博客
工作笔记，持续更新完善中
