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目录首先需要引入第三方依赖只需要在配置文件中按照如下配置创建如下两个数据库entitymapper.xmlmapper层Service层下面是两个测试方法下面可以来看一下测试结果:在
在我们工作中涉及到一些场景需要我们配置多数据源的操作,之前来说我们配置数据源需要写繁琐的配置类来配置我们的数据源,哪个是默认数据源等等,而现在我们可以使用“苞米豆”为我们提供的提供的第三方工具,只需要简单配置就可以实现多数据源之间的灵活切换了!
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
<version>3.3.5</version>
</dependency>
spring:
datasource:
dynamic:
primary: master #设置默认的数据源或者数据源组,默认值即为master
strict: false #严格匹配数据源,默认false. true未匹配到指定数据源时抛异常,false使用默认数据源
datasource:
master: # 名称可以自己定义
url: jdbc:Mysql://localhost:3306/students?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8
username: root
passWord: root
driver-class-name: com.mysql.cj.jdbc.Driver
slave: # 名称可以自己定义
url: jdbc:mysql://localhost:3306/teachers?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
@Data
public class Student implements Serializable {
private Integer id;
private String name;
private Integer age;
private String sex;
private static final long serialVersionUID = 1L;
}
@Data
public class Teacher implements Serializable {
private Integer id;
private String name;
private Integer age;
private String subject;
private static final long serialVersionUID = 1L;
}
<?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.example.demo.mysql.mapper.StudentDao">
<select id="findAllStudent" resultType="com.example.demo.entity.Student">
select *
from student;
</select>
</mapper>
<?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.example.demo.mysql.mapper.TeacherDao">
<select id="findAllTeacher" resultType="com.example.demo.entity.Teacher">
select *
from teacher;
</select>
</mapper>
@Mapper
public interface StudentDao {
List<Student> findAllStudent();
}
@Mapper
public interface TeacherDao {
List<Teacher> findAllTeacher();
}
@Service
public class StudentServiceImpl implements StudentService {
@Autowired
private StudentDao studentDao;
@Override
public List<Student> findAllStudent() {
return studentDao.findAllStudent();
}
@Service
@DS("slave")
public class TeacherServiceImpl implements TeacherService {
@Autowired
private TeacherDao teacherDao;
@Override
public List<Teacher> findAllTeacher() {
return teacherDao.findAllTeacher();
}
}
@RestController
public class TestController {
@Autowired
private StudentService studentService;
@Autowired
private TeacherService teacherService;
@GetMapping("/test/1")
public List<Student> findAllStudent() {
return studentService.findAllStudent();
}
@GetMapping("/test/2")
public List<Teacher> findAllTeacher() {
return teacherService.findAllTeacher();
}
}
需要注意的一点是mapper和mapper.xml路径需一致否自会导致编译后找不到xml文件
查询学生:
查询老师:
此时不管是学生还是老师的信息是都可以查询出来的,这就全靠TeacherServiceImpl中使用的DS(“slave”)指定了数据源,假如说我们把注解去掉再来一次试试,可以看到请求报错提示students库中没有teacher这个表,所以说在我们没有指定数据源的时候,它是会自动去匹配默认的数据源来查询!
--结束END--
本文标题: 如何在Java SpringBoot项目中配置动态数据源你知道吗
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