SpringBoot怎么配置多数据源

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一、建库建表

1.1 创建数据库db1和数据库db2

1.2 在数据库db1中创建表db1

CREATE TABLE `db1` (  `id` int unsigned zerofill NOT NULL AUTO_INCREMENT,  `name` varchar(50) DEFAULT NULL,  `age` int unsigned zerofill DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

1.3 在数据库db2中创建表db2

CREATE TABLE `db2` (  `id` int unsigned zerofill NOT NULL AUTO_INCREMENT,  `name` varchar(50) DEFAULT NULL,  `age` int unsigned zerofill DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

二、创建springboot项目

2.1 pom.xml导入依赖

            org.springframework.boot            spring-boot-starter-web                            org.mybatis.spring.boot            mybatis-spring-boot-starter            2.1.4                            mysql            mysql-connector-java            runtime                            org.springframework.boot            spring-boot-starter-test            test                                                org.junit.vintage                    junit-vintage-engine                                                        junit            junit            test        

2.2 创建application.yml文件(与 2.3 二选一进行配置,推荐此方法)

server:  port: 8080 # 启动端口spring:  datasource:    db1: # 数据源1      jdbc-url: jdbc:mysql://localhost:3306/db1?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8      username: root      password: root      driver-class-name: com.mysql.cj.jdbc.Driver    db2: # 数据源2      jdbc-url: jdbc:mysql://localhost:3306/db2?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8      username: root      password: root      driver-class-name: com.mysql.cj.jdbc.Driver

2.3 创建application.properties文件(与 2.2 二选一进行配置)

server.port=8080      spring.datasource.db1.url=jdbc:mysql://localhost:3306/db1?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8      spring.datasource.db1.username=root      spring.datasource.db1.password=root      spring.datasource.db1.driver-class-name=com.mysql.jdbc.Driver      spring.datasource.db2.url=jdbc:mysql://localhost:3306/db2?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8      spring.datasource.db2.username=root      spring.datasource.db2.password=root      spring.datasource.db2.driver-class-name=com.mysql.jdbc.Driver

2.4 创建mapper文件

我个人是放在mapper包下，文件随便命名的
代码随便写的，测试而已

import org.apache.ibatis.annotations.Insert;import org.apache.ibatis.annotations.Mapper;/** * @Author if * @Description: What is it * @Date 2021-05-20 下午 09:52 */@Mapperpublic interface Db1Mapper {    @Insert("insert into db1(name,age) values('if',18)")    int add();}

import org.apache.ibatis.annotations.Insert;import org.apache.ibatis.annotations.Mapper;/** * @Author if * @Description: What is it * @Date 2021-05-20 下午 09:52 */@Mapperpublic interface Db2Mapper {    @Insert("insert into db2(name,age) values('fi',81)")    int add();}

2.5 创建config配置文件

我个人是放在config包下，文件随便命名的

import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.mybatis.spring.annotation.MapperScan;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.boot.jdbc.DataSourceBuilder;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;/** * @Author if * @Description: 注意以下有些文件路径需要更改 * @Date 2021-05-20 下午 09:56 */@Configuration@MapperScan(basePackages = "com.ifyyf.study.mapper.db1", sqlSessionFactoryRef = "db1SqlSessionFactory")public class Db1DataSourceConfig {    @Bean("db1DataSource")    @ConfigurationProperties(prefix = "spring.datasource.db1") //读取application.yml中的配置参数映射成为一个对象    public DataSource getDb1DataSource(){        return DataSourceBuilder.create().build();    }    @Bean("db1SqlSessionFactory")    public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();        bean.setDataSource(dataSource);        // mapper的xml形式文件位置必须要配置，不然将报错：no statement （这种错误也可能是mapper的xml中，namespace与项目的路径不一致导致）        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/db1/*.xml"));        return bean.getObject();    }    @Bean("db1SqlSessionTemplate")    public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory){        return new SqlSessionTemplate(sqlSessionFactory);    }}

import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.mybatis.spring.annotation.MapperScan;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.boot.jdbc.DataSourceBuilder;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.sql.DataSource;/** * @Author if * @Description: 注意以下有些文件路径需要更改 * @Date 2021-05-20 下午 09:56 */@Configuration@MapperScan(basePackages = "com.ifyyf.study.mapper.db2", sqlSessionFactoryRef = "db2SqlSessionFactory")public class Db2DataSourceConfig {    @Bean("db2DataSource")    @ConfigurationProperties(prefix = "spring.datasource.db2") //读取application.yml中的配置参数映射成为一个对象    public DataSource getDb2DataSource(){        return DataSourceBuilder.create().build();    }    @Bean("db2SqlSessionFactory")    public SqlSessionFactory db2SqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();        bean.setDataSource(dataSource);        // mapper的xml形式文件位置必须要配置，不然将报错：no statement （这种错误也可能是mapper的xml中，namespace与项目的路径不一致导致）        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapping/db2/*.xml"));        return bean.getObject();    }    @Bean("db2SqlSessionTemplate")    public SqlSessionTemplate db2SqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory){        return new SqlSessionTemplate(sqlSessionFactory);    }}

三、测试代码运行

3.1 测试类中测试代码

springboot项目中测试类进行测试

import com.ifyyf.study.mapper.db1.Db1Mapper;import com.ifyyf.study.mapper.db2.Db2Mapper;import org.junit.jupiter.api.Test;import org.springframework.boot.test.context.SpringBootTest;import javax.annotation.Resource;@SpringBootTestclass StudyApplicationTests {    @Resource    private Db1Mapper db1Mapper;    @Resource    private Db2Mapper db2Mapper;    @Test    void contextLoads() {        System.out.println(db1Mapper.add());        System.out.println(db2Mapper.add());    }}

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