Mybatis注解实现多数据源读写分离详解
人气:0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=utf8 mybatis: 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 @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<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) @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; /** * 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 @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; /** * 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 @RequestMapping public 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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