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首先需要建立兩個(gè)庫(kù)進(jìn)行測(cè)試,我這里使用的是master_test和slave_test兩個(gè)庫(kù),兩張庫(kù)都有一張同樣的表(偷懶,喜喜),表結(jié)構(gòu)
表名 t_user
| 字段名 | 類型 | 備注 |
| :------: | :------: | :------: |
| id | int | 主鍵自增ID |
| name | varchar | 名稱 |
表中分別添加兩條不同數(shù)據(jù),方便測(cè)試
主數(shù)據(jù)庫(kù)記錄name為xiaobin,從庫(kù)為xiaoliu
開(kāi)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啟動(dòng)坐標(biāo) --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 添加lombok工具坐標(biāo) --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${lombok.version}</version> </dependency> <!-- 添加springboot 測(cè)試坐標(biāo) --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> </dependency> <!-- 添加lombox 測(cè)試坐標(biāo) --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${lombox.version}</version> </dependency> <!-- 添加mybatis依賴坐標(biāo) --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>${mybatis.version}</version> </dependency> <!-- 添加mysql驅(qū)動(dòng)器坐標(biāo) --> <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數(shù)據(jù)源坐標(biāo) --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.10</version> </dependency> <!-- 添加AOP坐標(biāo) --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> </dependencies> </project>
動(dòng)態(tài)數(shù)據(jù)源配置
這里使用的數(shù)據(jù)源為druid,實(shí)現(xiàn)數(shù)據(jù)源之間的切換用@DataSource自定義注解,配置Aop進(jìn)行切換
application.yml 配置文件
spring: datasource: type: com.alibaba.druid.pool.DruidDataSource druid: xiaobin-master: # 主數(shù)據(jù)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: # 從數(shù)據(jù)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
多數(shù)據(jù)源配置類
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; /** * 創(chuàng)建時(shí)間: 2019/9/22 11:42 * 備注:多數(shù)據(jù)源配置信息 * 碼農(nóng)自學(xué)交流小群:260532022,歡迎大家的加入,分享學(xué)習(xí)是一件開(kāi)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); } }
動(dòng)態(tài)數(shù)據(jù)源切換類
package com.xiaobin.config; import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; import org.springframework.lang.Nullable; import javax.sql.DataSource; import java.util.Map; /** * 創(chuàng)建時(shí)間: 2019/9/22 11:51 * 備注:動(dòng)態(tài)數(shù)據(jù)源 * 碼農(nóng)自學(xué)交流小群:260532022,歡迎大家的加入,分享學(xué)習(xí)是一件開(kāi)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(); } }
自定義@DataSource注解
在需要切換數(shù)據(jù)的Dao添加此注解
package com.xiaobin.annotation; import java.lang.annotation.*; /** * 創(chuàng)建時(shí)間: 2019/9/22 11:53 * 備注:自定義數(shù)據(jù)源選擇注解 * 碼農(nóng)自學(xué)交流小群:260532022,歡迎大家的加入,分享學(xué)習(xí)是一件開(kāi)心事 **/ @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface DataSource { String name() default ""; }
Aop切面類配置
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; /** * 創(chuàng)建時(shí)間: 2019/9/22 11:54 * 備注: * 碼農(nóng)自學(xué)交流小群:260532022,歡迎大家的加入,分享學(xué)習(xí)是一件開(kāi)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(); } } }
啟動(dòng)配置注解信息,重要(不然運(yùn)行會(huì)報(bào)錯(cuò))
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; /** * 創(chuàng)建時(shí)間: 2019/9/22 11:17 * 備注: * 碼農(nóng)自學(xué)交流小群:260532022,歡迎大家的加入,分享學(xué)習(xí)是一件開(kāi)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); } }
測(cè)試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; /** * 創(chuàng)建時(shí)間: 2019/9/22 12:08 * 備注: * 碼農(nóng)自學(xué)交流小群:260532022,歡迎大家的加入,分享學(xué)習(xí)是一件開(kāi)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(); } } }
效果圖
更具路徑傳值,進(jìn)行主從數(shù)據(jù)源切換
目錄結(jié)構(gòu)
源碼地址(數(shù)據(jù)庫(kù)需要自己創(chuàng)建)https://gitee.com/MyXiaoXiaoB...
總結(jié)
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