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Mybatis多数据源读写分离(注解实现)

时间:2019-09-22 14:35:25      阅读:69      评论:0      收藏:0      [点我收藏+]

标签:map   drive   表结构   classpath   int   ram   super   tco   需要   

#### Mybatis多数据源读写分离(注解实现) ------ 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 | ![file](https://img2018.cnblogs.com/blog/1602984/201909/1602984-20190922132558249-1393771686.jpg) 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-parent 2.1.4.RELEASE com.xiaobin mysql_master_slave 1.0-SNAPSHOT 1.8 1.18.6 1.3.2 1.18.6 org.springframework.boot spring-boot-starter-web org.projectlombok lombok ${lombok.version} org.springframework.boot spring-boot-starter-test org.projectlombok lombok ${lombox.version} org.mybatis.spring.boot mybatis-spring-boot-starter ${mybatis.version} mysql mysql-connector-java org.springframework.boot spring-boot-starter-jdbc com.alibaba druid-spring-boot-starter 1.1.10 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/*.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 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 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.*; /** * 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 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 ![file](https://img2018.cnblogs.com/blog/1602984/201909/1602984-20190922132558471-1360902101.jpg) ![file](https://img2018.cnblogs.com/blog/1602984/201909/1602984-20190922132558693-1674030148.jpg) #### 目录结构 ![file](https://img2018.cnblogs.com/blog/1602984/201909/1602984-20190922132558939-255963524.jpg) 源码地址(数据库需要自己创建)https://gitee.com/MyXiaoXiaoBin/learning-to-share/tree/master/mysql_master_slave ###### 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

Mybatis多数据源读写分离(注解实现)

标签:map   drive   表结构   classpath   int   ram   super   tco   需要   

原文地址:https://www.cnblogs.com/hy-xiaobin/p/11567144.html

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