项目依赖springboot2+mybatis+mysql
首先在mysql中创建数据库db1和db2，然后分别在两个数据库中创建表student1和studnet2并插入演示数据
create DATABASE db1;
use db1;
create table student1(
name varchar(100) not null,
age int
);
insert into student1(name,age) values('张三',18);
create DATABASE db2;
use db2;
create table student2(
name varchar(100) not null,
age int
);
insert into student2(name,age) values('李四',20);
创建springboot项目并导入mybatis和mysql依赖
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
项目结构
application.properties配置数据源
spring.datasource.db1.jdbc-url=jdbc:mysql://localhost:3306/db1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.db1.username=root
spring.datasource.db1.password=root
spring.datasource.db1.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.db2.jdbc-url=jdbc:mysql://localhost:3306/db2?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.db2.username=root
spring.datasource.db2.password=root
spring.datasource.db2.driver-class-name=com.mysql.cj.jdbc.Driver
MybatisMysqlOneConfig.java
package com.example.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 org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.example.mapper.db1", sqlSessionTemplateRef = "db1SessionTemplate")
public class MybatisMysqlOneConfig {
@Bean(name = "db1")
@Primary
@ConfigurationProperties(prefix = "spring.datasource.db1")
public DataSource db1() {
return DataSourceBuilder.create().build();
}
@Bean
@Primary
public SqlSessionFactory db1SessionFactory(@Qualifier("db1") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
//添加XML目录
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:/mapper/db1/**/*Mapper.xml"));
return bean.getObject();
}
@Bean
@Primary
public DataSourceTransactionManager db1TransactionManager(@Qualifier("db1") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean
@Primary
public SqlSessionTemplate db1SessionTemplate(@Qualifier("db1SessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
MybatisMysqlTwoConfig.java
package com.example.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 org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
@Configuration
@MapperScan(basePackages = "com.example.mapper.db2", sqlSessionTemplateRef = "db2SessionTemplate")
public class MybatisMysqlTwoConfig {
@Bean(name = "db2")
@ConfigurationProperties(prefix = "spring.datasource.db2")
public DataSource db2() {
return DataSourceBuilder.create().build();
}
@Bean
public SqlSessionFactory db2SessionFactory(@Qualifier("db2") DataSource dataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:/mapper/db2/**/*Mapper.xml"));
return bean.getObject();
}
@Bean
public DataSourceTransactionManager db2TransactionManager(@Qualifier("db2") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean
public SqlSessionTemplate db2SessionTemplate(@Qualifier("db2SessionFactory") SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
这里用了两个数据库进行演示，如果还要其它的可以继续按上面示例增加类和application.properties数据库配置，@Primary只需指定其中一个数据库就行
Student.java
package com.example.entity;
public class Student {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}
StudentDB1Mapper.java
package com.example.mapper.db1;
import com.example.entity.Student;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface StudentDB1Mapper {
@Select("select * from student1")
List<Student> getStudents();
}
StudentDB2Mapper.java
package com.example.mapper.db2;
import com.example.entity.Student;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface StudentDB2Mapper {
@Select("select * from student2")
List<Student> getStudents();
}
StudentService.java
package com.example.Service;
import com.example.entity.Student;
import com.example.mapper.db1.StudentDB1Mapper;
import com.example.mapper.db2.StudentDB2Mapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class StudentService {
@Autowired
private StudentDB1Mapper studentDB1Mapper;
@Autowired
private StudentDB2Mapper studentDB2Mapper;
public void getStudents() {
List<Student> students1 = studentDB1Mapper.getStudents();
List<Student> students2 = studentDB2Mapper.getStudents();
System.out.println("数据源DB1:" + students1);
System.out.println("数据源DB2:" + students2);
}
}
StudentController.java
package com.example.controller;
import com.example.Service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class StudentController {
@Autowired
private StudentService studentService;
@RequestMapping("/getStudents")
public void getStudents() {
studentService.getStudents();
}
}
最后启动项目，浏览器访问http://localhost:8080/getStudents看打印结果
