场景：
1.我本地有localhost:3306,localhost:7306两个mysql服务
2.在两个服务中分别创建test数据库
3.在两个数据库上创建相同的user表
4.我们规定ds1为写库，ds2为读库
一、创建一个springboot项目,结构如下
二、pom.xml直接粘贴过去(了解一下jar包作用!)
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>shardingsphere_demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>shardingsphere_demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!--提供了数据源配置、事务管理、数据访问等等功能-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!--1.自动发现存在的DataSource-->
<!--2.利用SqlSessionFactoryBean创建并注册SqlSessionFactory-->
<!--3.创建并注册SqlSessionTemplate-->
<!--4.自动扫描Mappers，并注册到Spring上下文环境方便程序的注入使用-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.3</version>
</dependency>
<!--Druid为监控而生的数据库连接池，它是阿里巴巴开源平台上的一个项目-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.23</version>
</dependency>
<!--核心依赖-sharding-jdbc-->
<dependency>
<groupId>org.apache.shardingsphere</groupId>
<artifactId>sharding-jdbc-spring-boot-starter</artifactId>
<version>4.1.1</version>
</dependency>
<!-- mysql依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- 测试依赖-->
<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>
<build>
<plugins>
<!-- 打包插件-->
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<!--maven里执行测试用例的插件-->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<skipTests>true</skipTests>
</configuration>
</plugin>
</plugins>
</build>
</project>
三、创建实体类
package com.example.demo.test.entity;
public class User {
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
四、创建mapper类
package com.example.demo.test.mapper;
import com.example.demo.test.entity.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;
@Repository
@Mapper
public interface UserMapper {
@Insert("insert into user(id,name) values(#{id},#{name})")
void insertUser(User user);
@Select("select * from user where id = #{id}")
User queryUser(Long id);
}
四、修改application.properties配置文件(主要关注一下!)
#mybatis.type-aliases-package来指定POJO扫描包来让mybatis自动扫描到自定义的POJO
mybatis.type-aliases-package=com.example.demo.test
#配置数据源
spring.shardingsphere.datasource.names=ds1,ds2
#配置第一个数据源
spring.shardingsphere.datasource.ds1.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.ds1.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.ds1.url=jdbc:mysql://localhost:3306/test?serverTimezone=UTC
spring.shardingsphere.datasource.ds1.username=root
spring.shardingsphere.datasource.ds1.password=123456
#配置第二个数据源
spring.shardingsphere.datasource.ds2.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.ds2.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.ds2.url=jdbc:mysql://localhost:7306/test?serverTimezone=UTC
spring.shardingsphere.datasource.ds2.username=root
spring.shardingsphere.datasource.ds2.password=123456
#主库从库逻辑定义
spring.shardingsphere.masterslave.name=ms
spring.shardingsphere.masterslave.master-data-source-name=ds1
spring.shardingsphere.masterslave.slave-data-source-names=ds2
#显示sql
spring.shardingsphere.props.sql.show=true
五、创建测试类
package com.example.demo.test;
import com.example.demo.test.entity.User;
import com.example.demo.test.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class ShardingsphereDemoApplicationTests {
@Autowired
private UserMapper userMapper;
@Test
public void insertUser() {
User user = new User();
user.setId(1);
user.setName("xm");
userMapper.insertUser(user);
}
@Test
public void queryUser() {
User user = userMapper.queryUser(1l);
System.out.println("我要查数据啦---" + user);
}
}
七、测试
1.执行insertUser()方法
2.执行queryUser()方法
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