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这两天抽空搞了一下Sharding jdbc，鉴于现在做的项目中也用到了这块(不是我搞的)，作为一名对技术痴迷的渣男，怎么可能无视它的存在，必须自己来搞一搞哈。

搞起~

项目搭建

1、新建一个spring boot工程，添加依赖

<dependencies>
<!--核心服务-->
<dependency>
<groupId>top.qrainly</groupId>
<artifactId>bj_core</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!--druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!--sharding-jdbc-->
<dependency>
<groupId>io.shardingsphere</groupId>
<artifactId>sharding-jdbc-spring-boot-starter</artifactId>
<version>3.1.0.M1</version>
</dependency>
<!--jmockdata-->
<dependency>
<groupId>com.github.jsonzou</groupId>
<artifactId>jmockdata</artifactId>
<version>4.1.2</version>
</dependency>
</dependencies>

这里友情推荐一下，依赖里用到了朋友开源的一个工具插件JMockData，此乃开发测试之利器，强烈推荐！！！

2、在master库执行sql脚本，创建用户表

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(12) NOT NULL AUTO_INCREMENT,
`username` varchar(12) NOT NULL,
`password` varchar(30) NOT NULL,
PRIMARY KEY (`id`),
KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_0`;
CREATE TABLE `user_0` (
`id` int(12) NOT NULL AUTO_INCREMENT,
`username` varchar(12) NOT NULL,
`password` varchar(30) NOT NULL,
PRIMARY KEY (`id`),
KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_1`;
CREATE TABLE `user_1` (
`id` int(12) NOT NULL AUTO_INCREMENT,
`username` varchar(12) NOT NULL,
`password` varchar(30) NOT NULL,
PRIMARY KEY (`id`),
KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_2`;
CREATE TABLE `user_2` (
`id` int(12) NOT NULL AUTO_INCREMENT,
`username` varchar(12) NOT NULL,
`password` varchar(30) NOT NULL,
PRIMARY KEY (`id`),
KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_3`;
CREATE TABLE `user_3` (
`id` int(12) NOT NULL AUTO_INCREMENT,
`username` varchar(12) NOT NULL,
`password` varchar(30) NOT NULL,
PRIMARY KEY (`id`),
KEY `idx-username` (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `user_4`;
CREATE TABLE `user_4` (
`id` INT(12) NOT NULL AUTO_INCREMENT,
`username` VARCHAR(12) NOT NULL,
`password` VARCHAR(30) NOT NULL,
PRIMARY KEY (`id`),
KEY `idx-username` (`username`)
) ENGINE=INNODB DEFAULT CHARSET=utf8;

配置主从复制的内容请参考windows上mysql的主从配置

3、配置生成dao/domain文件 mybatis-generator配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>

<context id="DB2Tables"    targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接地址账号密码-->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/bj_sharding?useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=false&amp;allowMultiQueries=true" userId="root" password="123456">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--生成Model类存放位置-->
<javaModelGenerator targetPackage="top.qrainly.sharding.jdbc.domain" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!--生成映射文件存放位置-->
<sqlMapGenerator targetPackage="top.qrainly.sharding.jdbc.dao" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--生成Dao类存放位置-->
<!-- 客户端代码，生成易于使用的针对Model对象和XML配置文件 的代码
type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象
type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口
-->
<javaClientGenerator type="XMLMAPPER" targetPackage="top.qrainly.sharding.jdbc.dao" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--生成对应表及类名-->
<table tableName="user" domainObjectName="User" mapperName="UserDAO" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true"></table>
</context>
</generatorConfiguration>

4、提供一个查询和添加的接口

controller

/**
* @author v_liuwen
* @date 2019-07-10
*/
@RestController
@RequestMapping(value = "/user")
@Slf4j
public class UserController {

@Autowired
private IUserService iUserService;

@GetMapping("/list")
public JsonResult<List<User>> list() {
List<User> userList = iUserService.findUserList();
return JsonResult.okJsonResultWithData(userList);
}

@GetMapping("/add")
public JsonResult<Boolean> add(@RequestParam(name = "user",required = false) User user) {
log.info("新增用户信息-->{}", JSONObject.toJSONString(user));
boolean result = iUserService.addUser();
return JsonResult.okJsonResultWithData(result);
}

@GetMapping("/batchAdd")
public JsonResult<Boolean> batchAdd() {
boolean result = iUserService.batchAddUser();
return JsonResult.okJsonResultWithData(result);
}
}

service

/**
* @author v_liuwen
* @date 2019-07-10
*/
@Service
@Slf4j
public class IUserServiceImpl implements IUserService {

private AtomicInteger num = new AtomicInteger(1);

@Resource
private UserDAO userDAO;

@Override
public boolean addUser() {
User user = JMockData.mock(User.class);
int i = userDAO.insertSelective(user);
if(i == 1){
return true;
}
return false;
}

@Override
public List<User> findUserList() {
List<User> userList = userDAO.findUserList();
return userList;
}

@Override
public boolean batchAddUser() {
try{
for (int i =100;i<150;i++){
User user = JMockData.mock(User.class);
user.setId(num.getAndIncrement());
userDAO.insertSelective(user);
}
return true;
}catch (Exception e){
log.error("批量插入失败  失败原因-->{}",e.getMessage());
return false;
}
}
}

5、配置文件(重点在这里)

基础配置-->application.yml

server:
port: 8018

spring:
application:
name: bj-sharding-jdbc
main:
allow-bean-definition-overriding: true
profiles:
# rw-读写分离配置  table-数据分表+读写分离   dt-分库分表+读写分离
active: dt
mybatis:
mapper-locations: classpath:/top/qrainly/**/dao/**/*.xml

读写分离配置-->application-rw.yml

sharding:
jdbc:
dataSource:
names: db-test0,db-test1
db-test0:
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/bj_sharding?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
username: root
password: 123456
maxPoolSize: 20
db-test1:
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3307/bj_sharding?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
username: root
password: 123456
maxPoolSize: 20
config:
# 仅配置读写分离时打开此配置
masterslave:
# 配置从库选择策略，提供轮询与随机，这里选择用轮询//random 随机 //round_robin 轮询
load-balance-algorithm-type: round_robin
name: db1s2
master-data-source-name: db-test0
slave-data-source-names: db-test1
props:
sql:
# 开启SQL显示，默认值: false，注意：仅配置读写分离时不会打印日志！！！
show: true

数据分表+读写分离配置-->application-table.yml

sharding:
jdbc:
dataSource:
names: db-test0,db-test1
db-test0:
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/bj_sharding?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
username: root
password: 123456
maxPoolSize: 20
db-test1:
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3307/bj_sharding?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
username: root
password: 123456
maxPoolSize: 20
config:
# 配置数据分表
sharding:
tables:
user:
table-strategy:
standard:
sharding-column: id
precise-algorithm-class-name: top.qrainly.sharding.jdbc.config.MyPreciseShardingAlgorithm
# 读取ds_0数据源的user_0、user_1、user_2、user_3
actual-data-nodes: ds_0.user_$->{0..3}
master-slave-rules:
ds_0:
master-data-source-name: db-test0
slave-data-source-names: db-test1
props:
sql:
# 开启SQL显示，默认值: false，注意：仅配置读写分离时不会打印日志！！！
show: true

分库分表+读写分离配置-->application-dt.yml

---
sharding:
jdbc:
datasource:
names: ds-master-0,ds-master-1,ds-master-0-slave-0,ds-master-1-slave-0
# 主库0
ds-master-0:
password: 123456
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/bj_sharding?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
username: root
# 主库0-从库0
ds-master-0-slave-0:
password: 123456
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3307/bj_sharding?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
username: root
# 主库1
ds-master-1:
password: 123456
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/bj_sharding1?useUnicode=true&characterEncoding=utf8&tinyInt1isBit=false&useSSL=false&serverTimezone=GMT
username: root
# 主库1-从库0
ds-master-1-slave-0:
password: 123456
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3307/bj_sharding1?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&serverTimezone=GMT
username: root
config:
sharding:
tables:
user:
table-strategy:
inline:
sharding-column: id
algorithm-expression: user_$->{id % 5}
key-generator-column-name: id
actual-data-nodes: ds_$->{0..1}.user_$->{0..4}
default-database-strategy:
inline:
# 置的分库的字段，本案例是根据id进行分
sharding-column: id
# 置的分库的逻辑，根据id%2进行分
algorithm-expression: ds_$->{id % 2}
master-slave-rules:
ds_1:
slave-data-source-names: ds-master-1-slave-0
master-data-source-name: ds-master-1
ds_0:
slave-data-source-names: ds-master-0-slave-0
master-data-source-name: ds-master-0

注：分库分表配置下需要在@SpringBootApplication上添加参数exclude={DataSourceAutoConfiguration.class}

ok，切换spring.profiles.active在不同配置模式下耍吧！

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