1. 引入jar包
pom.xml文件
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<?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 https://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> 2.5 . 6 </version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.multi.datasource</groupId> <artifactId>demo</artifactId> <version> 0.0 . 1 -SNAPSHOT</version> <name>demo</name> <description>Demo project for Spring Boot</description> <properties> <java.version> 1.8 </java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version> 1.3 . 2 </version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version> 1.1 . 8 </version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version> 1.16 . 22 </version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <excludes> <exclude> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </exclude> </excludes> </configuration> </plugin> </plugins> </build> </project> |
2. properties配置
分别准备两个数据源
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server.port= 18888 mybatis.mapper-locations=classpath:mapper/*.xml my1.datasource.url=jdbc:mysql: //10.0.0.125:3306/wyl?autoReconnect=true my1.datasource.driverClassName=com.mysql.cj.jdbc.Driver my1.datasource.username=root my1.datasource.password= 123456 my2.datasource.url=jdbc:mysql: //10.0.0.160:3306/wyl?autoReconnect=true my2.datasource.driverClassName=com.mysql.cj.jdbc.Driver my2.datasource.username=root my2.datasource.password= 123456 |
3. 分别配置两个数据源
第一个数据源
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package com.multi.datasource.config; import com.alibaba.druid.pool.DruidDataSource; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.mybatis.spring.annotation.MapperScan; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import javax.sql.DataSource; @Configuration @MapperScan (basePackages = My1DataSourceConfig.PACKAGE, sqlSessionFactoryRef = "my1SqlSessionFactory" ) public class My1DataSourceConfig { static final String PACKAGE = "com.multi.datasource.dao.my1" ; static final String MAPPER_LOCATION = "classpath:mapper/*.xml" ; @Value ( "${my1.datasource.url}" ) private String url; @Value ( "${my1.datasource.username}" ) private String user; @Value ( "${my1.datasource.password}" ) private String password; @Value ( "${my1.datasource.driverClassName}" ) private String driverClass; @Bean (name = "my1DataSource" ) public DataSource my1DataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(driverClass); dataSource.setUrl(url); dataSource.setUsername(user); dataSource.setPassword(password); dataSource.setMaxWait(Integer.MAX_VALUE); dataSource.setTestOnBorrow( true ); dataSource.setTestOnReturn( true ); dataSource.setTestWhileIdle( true ); return dataSource; } @Bean (name = "my1TransactionManager" ) public DataSourceTransactionManager my1TransactionManager() { return new DataSourceTransactionManager(my1DataSource()); } @Bean (name = "my1SqlSessionFactory" ) public SqlSessionFactory my1SqlSessionFactory( @Qualifier ( "my1DataSource" ) DataSource my1DataSource) throws Exception { final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean(); sessionFactory.setDataSource(my1DataSource); sessionFactory.setMapperLocations( new PathMatchingResourcePatternResolver().getResources(My1DataSourceConfig.MAPPER_LOCATION)); return sessionFactory.getObject(); } } |
第二个数据源
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package com.multi.datasource.config; import com.alibaba.druid.pool.DruidDataSource; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionFactoryBean; import org.mybatis.spring.annotation.MapperScan; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.jdbc.datasource.DataSourceTransactionManager; import javax.sql.DataSource; @Configuration @MapperScan (basePackages = My1DataSourceConfig.PACKAGE, sqlSessionFactoryRef = "my1SqlSessionFactory" ) public class My1DataSourceConfig { static final String PACKAGE = "com.multi.datasource.dao.my1" ; static final String MAPPER_LOCATION = "classpath:mapper/*.xml" ; @Value ( "${my1.datasource.url}" ) private String url; @Value ( "${my1.datasource.username}" ) private String user; @Value ( "${my1.datasource.password}" ) private String password; @Value ( "${my1.datasource.driverClassName}" ) private String driverClass; @Bean (name = "my1DataSource" ) public DataSource my1DataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(driverClass); dataSource.setUrl(url); dataSource.setUsername(user); dataSource.setPassword(password); dataSource.setMaxWait(Integer.MAX_VALUE); dataSource.setTestOnBorrow( true ); dataSource.setTestOnReturn( true ); dataSource.setTestWhileIdle( true ); return dataSource; } @Bean (name = "my1TransactionManager" ) public DataSourceTransactionManager my1TransactionManager() { return new DataSourceTransactionManager(my1DataSource()); } @Bean (name = "my1SqlSessionFactory" ) public SqlSessionFactory my1SqlSessionFactory( @Qualifier ( "my1DataSource" ) DataSource my1DataSource) throws Exception { final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean(); sessionFactory.setDataSource(my1DataSource); sessionFactory.setMapperLocations( new PathMatchingResourcePatternResolver().getResources(My1DataSourceConfig.MAPPER_LOCATION)); return sessionFactory.getObject(); } } |
4. Dao目录
为了区分两个数据源,分别设置了不同的目录
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package com.multi.datasource.dao.my1; import com.multi.datasource.entity.UserEntity; import org.apache.ibatis.annotations.Mapper; @Mapper public interface Test1Mapper { UserEntity query(); } |
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package com.multi.datasource.dao.my2; import com.multi.datasource.entity.UserEntity; import org.apache.ibatis.annotations.Mapper; @Mapper public interface Test2Mapper { UserEntity query(); } |
5. Entity
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package com.multi.datasource.entity; import lombok.Data; @Data public class UserEntity { private String userName; } |
6. Mapper文件
从my1数据源查询
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<? xml version = "1.0" encoding = "UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> < mapper namespace = "com.multi.datasource.dao.my1.Test1Mapper" > < select id = "query" resultType = "com.multi.datasource.entity.UserEntity" > select user_name as userName from t_user </ select > </ mapper > |
从my2数据源查询
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<? xml version = "1.0" encoding = "UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> < mapper namespace = "com.multi.datasource.dao.my2.Test2Mapper" > < select id = "query" resultType = "com.multi.datasource.entity.UserEntity" > select user_name as userName from t_user </ select > </ mapper > |
7. Controller测试
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package com.multi.datasource.controller; import com.multi.datasource.dao.my1.Test1Mapper; import com.multi.datasource.dao.my2.Test2Mapper; import com.multi.datasource.entity.UserEntity; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import javax.annotation.Resource; @RestController public class TestController { @Resource private Test1Mapper test1Mapper; @Resource private Test2Mapper test2Mapper; @RequestMapping ( "query" ) public void query() { UserEntity user1 = test1Mapper.query(); System.out.println( "my1 dataSource:" + user1); UserEntity user2 = test2Mapper.query(); System.out.println( "my2 dataSource:" + user2); } } |
两个数据源,对应的user_name
分别是zhangsan和lisi
8. 结果验证
访问 http://localhost:18888/query
,结果如下
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原文链接:https://blog.csdn.net/CSDN_WYL2016/article/details/124086758