需求
最近有一个需求，需要把安某服务器中MySQL中的数据导入到另一个MySQL中，当时感觉导出到xxx.sql，然后导入进新的数据库，发现MySQL导出到xxx.sql已经实现不了了，每次导出都会卡住，时间继续，但是导出条数一直不变，后来就想了个比较 笨的方法，就是查数据库1，然后插入数据库2，所以需要SpringBoot整合多数据源，从而记录搭建环境的过程。
源码下载
SpringBoot MyBatis MySQL
https://github.com/cbeann/Demooo/tree/master/springboot-2database-demo
项目目录
核心代码
pom.xml
代码语言：javascript复制<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</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>2.1.3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>application.yml
代码语言：javascript复制erver:
port: 8080
spring:
datasource:
db2:
jdbc-url: jdbc:mysql://127.0.0.1:3306/db2?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=GMT+8
username: root
password: 123456
driver-class-name: com.mysql.cj.jdbc.Driver
db1:
jdbc-url: jdbc:mysql://127.0.0.1:3306/db1?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=GMT+8
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver配置两个数据源
代码语言：javascript复制package com.example.springboot2databasedemo.config;
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.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
/**
* @author chaird
* @create 2020-10-30 14:21
*/
@Configuration
@MapperScan(
basePackages = "com.example.springboot2databasedemo.dao.db1", // 扫描的dao包
sqlSessionFactoryRef = "db1SqlSessionFactory")
public class DataSourceConfig1 {
@Primary // 表示这个数据源是默认数据源, 这个注解必须要加，因为不加的话spring将分不清楚那个为主数据源（默认数据源）
@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();
}
@Primary
@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*:mapper/db1/*.xml")); 扫描的daoXML包
return bean.getObject();
}
@Primary
@Bean("db1SqlSessionTemplate")
public SqlSessionTemplate db1SqlSessionTemplate(
@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}package com.example.springboot2databasedemo.config;
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 chaird
* @create 2020-10-30 14:22
*/
@Configuration
@MapperScan(basePackages = "com.example.springboot2databasedemo.dao.db2", sqlSessionFactoryRef = "db2SqlSessionFactory")
public class DataSourceConfig2 {
@Bean("db2DataSource")
@ConfigurationProperties(prefix = "spring.datasource.db2")
public DataSource getDb1DataSource(){
return DataSourceBuilder.create().build();
}
@Bean("db2SqlSessionFactory")
public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/db2/*.xml"));
return bean.getObject();
}
@Bean("db2SqlSessionTemplate")
public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db2SqlSessionFactory") SqlSessionFactory sqlSessionFactory){
return new SqlSessionTemplate(sqlSessionFactory);
}
}其他的也就没啥的，亲测可用
未解决的问题
如下图所示，其实我是注入了2个StudentDao 1和2，如果我在不同的包下定义相同的StudentDao，那怎么实现？？？
代码语言：javascript复制//@Service
public class StudentService {
@Autowired private StudentDao1 studentDaoDb1;
@Autowired private StudentDao2 studentDaoDb2;
public void transform(int id) {
Student student = studentDaoDb1.selectByPrimaryKey(1);
studentDaoDb2.insert(student);
System.out.println("0ver");
}
}
