首先需要建立两个库进行测试，我这里使用的是master_test和slave_test两个库，两张库都有一张同样的表（偷懒，喜喜），表结构
表名 t_user
| 字段名 | 类型 | 备注 |
| :------: | :------: | :------: |
| id | int | 主键自增ID |
| name | varchar | 名称 |
表中分别添加两条不同数据，方便测试
主数据库记录name为xiaobin，从库为xiaoliu
开始使用Springboot 整合mybatis，首先引入pom文件
4.0.0 org.springframework.boot spring-boot-starter-parent2.1.4.RELEASE com.xiaobin mysql_master_slave1.0-SNAPSHOT 1.8 1.18.6 1.3.2 1.18.6 org.springframework.boot spring-boot-starter-weborg.projectlombok lombok${lombok.version} org.springframework.boot spring-boot-starter-testorg.projectlombok lombok${lombox.version} org.mybatis.spring.boot mybatis-spring-boot-starter${mybatis.version} mysql mysql-connector-javaorg.springframework.boot spring-boot-starter-jdbccom.alibaba druid-spring-boot-starter1.1.10 org.springframework.boot spring-boot-starter-aop
动态数据源配置
这里使用的数据源为druid，实现数据源之间的切换用@DataSource自定义注解，配置Aop进行切换
application.yml 配置文件
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
druid:
xiaobin-master: # 主数据源
driverClassName: com.mysql.jdbc.Driver
username: root
password: root
url: jdbc:mysql://localhost:3306/master_test?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8
xiaobin-slave: # 从数据源
driverClassName: com.mysql.jdbc.Driver
username: root
password: root
url: jdbc:mysql://localhost:3306/slave_test?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8
mybatis:
mapper-locations: classpath:mapper
@Configuration
@Component
public class DynamicDataSourceConfig {
@Bean
@ConfigurationProperties("spring.datasource.druid.xiaobin-master")
public DataSource xiaobinMasterDataSource(){
return DruidDataSourceBuilder.create().build();
}
@Bean
@ConfigurationProperties("spring.datasource.druid.xiaobin-slave")
public DataSource xiaobinSlaveDataSource(){
return DruidDataSourceBuilder.create().build();
}
@Bean
@Primary
public DynamicDataSource dataSource(DataSource xiaobinMasterDataSource, DataSource xiaobinSlaveDataSource) {
Map targetDataSources = new HashMap<>();
targetDataSources.put("xiaobin-master",xiaobinMasterDataSource);
targetDataSources.put("xiaobin-slave", xiaobinSlaveDataSource);
return new DynamicDataSource(xiaobinMasterDataSource, targetDataSources);
}
}
动态数据源切换类
package com.xiaobin.config;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
import org.springframework.lang.Nullable;
import javax.sql.DataSource;
import java.util.Map;
public class DynamicDataSource extends AbstractRoutingDataSource {
private static final ThreadLocal contextHolder = new ThreadLocal<>();
public DynamicDataSource(DataSource defaultTargetDataSource, Map targetDataSources) {
super.setDefaultTargetDataSource(defaultTargetDataSource);
super.setTargetDataSources(targetDataSources);
super.afterPropertiesSet();
}
@Override
protected Object determineCurrentLookupKey() {
return getDataSource();
}
public static void setDataSource(String dataSource) {
contextHolder.set(dataSource);
}
public static String getDataSource() {
return contextHolder.get();
}
public static void clearDataSource() {
contextHolder.remove();
}
}
自定义@DataSource注解
在需要切换数据的Dao添加此注解
package com.xiaobin.annotation;
import java.lang.annotation.*;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@documented
public @interface DataSource {
String name() default "";
}
Aop切面类配置
package com.xiaobin.aspect;
import com.xiaobin.annotation.DataSource;
import com.xiaobin.config.DynamicDataSource;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
@Aspect
@Component
public class DataSourceAspect {
@Pointcut("@annotation(com.xiaobin.annotation.DataSource)")
public void dataSourcePointCut() {
}
@Around("dataSourcePointCut()")
public Object around(ProceedingJoinPoint point) throws Throwable {
MethodSignature signature = (MethodSignature) point.getSignature();
Method method = signature.getMethod();
DataSource dataSource = method.getAnnotation(DataSource.class);
if(dataSource == null){
DynamicDataSource.setDataSource("xiaobin-master");
}else {
DynamicDataSource.setDataSource(dataSource.name());
}
try {
return point.proceed();
} finally {
DynamicDataSource.clearDataSource();
}
}
}
启动配置注解信息，重要（不然运行会报错）
package com.xiaobin;
import com.xiaobin.config.DynamicDataSourceConfig;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.context.annotation.import;
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
@MapperScan(basePackages = "com.xiaobin.mapper")
@import({DynamicDataSourceConfig.class})
public class StartApp {
public static void main(String[] args) {
SpringApplication.run(StartApp.class);
}
}
测试controller
package com.xiaobin.api;
import com.xiaobin.Entity.TUser;
import com.xiaobin.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
@RequestMapping
public class UserController {
@Autowired
private UserMapper userMapper;
@GetMapping("/{name}/list")
public List list(@PathVariable("name")String name){
if(name.equals("master")){
return userMapper.queryAllWithMaster();
}else{
return userMapper.queryAllWithSlave();
}
}
}
效果图
更具路径传值，进行主从数据源切换
目录结构
源码地址（数据库需要自己创建）https://gitee.com/MyXiaoXiaoB...
总结
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