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Mybatis注解实现多数据源读写分离详解

2020年02月13日 编程语言 ⁄ 共 8021字 ⁄ 字号 评论关闭

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

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.4.RELEASE</version> </parent> <groupId>com.xiaobin</groupId> <artifactId>mysql_master_slave</artifactId> <version>1.0-SNAPSHOT</version> <properties> <java.version>1.8</java.version> <lombok.version>1.18.6</lombok.version> <mybatis.version>1.3.2</mybatis.version> <lombox.version>1.18.6</lombox.version> </properties> <dependencies> <!-- 添加web启动坐标 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 添加lombok工具坐标 --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${lombok.version}</version> </dependency> <!-- 添加springboot 测试坐标 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> </dependency> <!-- 添加lombox 测试坐标 --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${lombox.version}</version> </dependency> <!-- 添加mybatis依赖坐标 --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>${mybatis.version}</version> </dependency> <!-- 添加mysql驱动器坐标 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <!-- 添加druid数据源坐标 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.10</version> </dependency> <!-- 添加AOP坐标 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> </dependencies></project>

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=utf8mybatis: mapper-locations: classpath:mapper/*.xml

多数据源配置类

package com.xiaobin.config;import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.stereotype.Component;import javax.sql.DataSource;import java.util.HashMap;import java.util.Map;/** * 创建时间: 2019/9/22 11:42 * 备注:多数据源配置信息 * 码农自学交流小群:260532022,欢迎大家的加入,分享学习是一件开心事 **/@Configuration@Componentpublic 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<Object, Object> 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;/** * 创建时间: 2019/9/22 11:51 * 备注:动态数据源 * 码农自学交流小群:260532022,欢迎大家的加入,分享学习是一件开心事 **/public class DynamicDataSource extends AbstractRoutingDataSource { private static final ThreadLocal<String> contextHolder = new ThreadLocal<>(); public DynamicDataSource(DataSource defaultTargetDataSource, Map<Object, Object> 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.*;/** * 创建时间: 2019/9/22 11:53 * 备注:自定义数据源选择注解 * 码农自学交流小群:260532022,欢迎大家的加入,分享学习是一件开心事 **/@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @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;/** * 创建时间: 2019/9/22 11:54 * 备注: * 码农自学交流小群:260532022,欢迎大家的加入,分享学习是一件开心事 **/@Aspect@Componentpublic 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;/** * 创建时间: 2019/9/22 11:17 * 备注: * 码农自学交流小群:260532022,欢迎大家的加入,分享学习是一件开心事 **/@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;/** * 创建时间: 2019/9/22 12:08 * 备注: * 码农自学交流小群:260532022,欢迎大家的加入,分享学习是一件开心事 **/@RestController@RequestMappingpublic class UserController { @Autowired private UserMapper userMapper; @GetMapping("/{name}/list") public List<TUser> 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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