教你使用springboot配置多数据源

教你使用springboot配置多数据源

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

ushttp://ername: 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

*/

@Mapper

public 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

*/

@Mapper

public 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;NWMtctGRY

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("dbhttp://1SqlSessionFactory")

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;

@SpringBootTest

class StudyApplicationTests {

@Resource

private Db1Mapper db1Mapper;

@Resource

private Db2Mapper db2Mapper;

@Test

void contextLoads() {

System.out.println(db1Mapper.add());

System.out.println(db2Mapper.add());

}

}

3.2 运行结果

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