Project Directory
Maven Dependency
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.fool</groupId>
<artifactId>hellosharding-table-rw</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.12.RELEASE</version>
<relativePath/>
</parent>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.3.1</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.6</version>
</dependency>
<dependency>
<groupId>org.apache.shardingsphere</groupId>
<artifactId>sharding-jdbc-spring-boot-starter</artifactId>
<version>4.1.1</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
DB Schema
schema.sql
CREATE TABLE `tb_user` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(30) DEFAULT NULL,
`password` varchar(30) DEFAULT NULL,
`age` int(10) unsigned DEFAULT NULL,
`create_by` varchar(30) NOT NULL,
`update_by` varchar(30) NOT NULL,
`create_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`update_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `tb_user0` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(30) DEFAULT NULL,
`password` varchar(30) DEFAULT NULL,
`age` int(10) unsigned DEFAULT NULL,
`create_by` varchar(30) NOT NULL,
`update_by` varchar(30) NOT NULL,
`create_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`update_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `tb_user1` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(30) DEFAULT NULL,
`password` varchar(30) DEFAULT NULL,
`age` int(10) unsigned DEFAULT NULL,
`create_by` varchar(30) NOT NULL,
`update_by` varchar(30) NOT NULL,
`create_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`update_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
CREATE TABLE `tb_user2` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(30) DEFAULT NULL,
`password` varchar(30) DEFAULT NULL,
`age` int(10) unsigned DEFAULT NULL,
`create_by` varchar(30) NOT NULL,
`update_by` varchar(30) NOT NULL,
`create_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
`update_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
Note：tb_user 只是用来做 MyBatis ORM 使用，另外需要额外创建两个库 test_master、test_slave
application.properties
server.port=8080
logging.level.org.fool.shardingtablerw=debug
mybatis.mapper-locations=classpath:mapper/**/*.xml
spring.shardingsphere.datasource.names=master,slave0
# master
spring.shardingsphere.datasource.master.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.master.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.master.url=jdbc:mysql://localhost:3306/test_master?characterEncoding=utf-8&serverTimezone=Asia/Shanghai
spring.shardingsphere.datasource.master.username=root
spring.shardingsphere.datasource.master.password=123456
# slave
spring.shardingsphere.datasource.slave0.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.slave0.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.slave0.url=jdbc:mysql://localhost:3306/test_slave?characterEncoding=utf-8&serverTimezone=Asia/Shanghai
spring.shardingsphere.datasource.slave0.username=root
spring.shardingsphere.datasource.slave0.password=123456
# sharding table
spring.shardingsphere.sharding.tables.tb_user.actual-data-nodes=master.tb_user$->{0..2}
spring.shardingsphere.sharding.tables.tb_user.table-strategy.inline.sharding-column=id
spring.shardingsphere.sharding.tables.tb_user.table-strategy.inline.algorithm-expression=tb_user$->{id % 3}
spring.shardingsphere.sharding.tables.tb_user.key-generator.column=id
spring.shardingsphere.sharding.tables.tb_user.key-generator.type=SNOWFLAKE
## R/W Splitting
spring.shardingsphere.sharding.master-slave-rules.master.master-data-source-name=master
spring.shardingsphere.sharding.master-slave-rules.master.slave-data-source-names=slave0
spring.shardingsphere.props.sql.show=true
Note: 这里为了方便查看测试效果，并没有实现主从部署，而是在同一个服务器实例中创建两个数据库来模拟主从数据库。
MyBatis-Plus Code Generator
CodeGenerator.java
package org.fool.shardingtablerw.generator;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.FileOutConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.TemplateConfig;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
import java.util.ArrayList;
import java.util.List;
public class CodeGenerator {
private static final String BASE_PACKAGE = "org.fool.shardingtablerw";
private static final String DB_URL = "jdbc:mysql://localhost:3306/test_master?useUnicode=true&useSSL=false&characterEncoding=utf8";
private static final String[] INCLUDE_TABLES = {"tb_user"};
public static void main(String[] args) {
// 代码生成器
AutoGenerator mpg = new AutoGenerator();
// 全局配置
GlobalConfig gc = new GlobalConfig();
String projectPath = System.getProperty("user.dir");
gc.setOutputDir(projectPath + "/src/main/java");
gc.setAuthor("admin");
gc.setOpen(false);
gc.setFileOverride(true);
gc.setIdType(IdType.AUTO);
gc.setDateType(DateType.ONLY_DATE);
mpg.setGlobalConfig(gc);
// 数据源配置
DataSourceConfig dsc = new DataSourceConfig();
dsc.setUrl(DB_URL);
dsc.setDriverName("com.mysql.cj.jdbc.Driver");
dsc.setUsername("root");
dsc.setPassword("123456");
dsc.setDbType(DbType.MYSQL);
mpg.setDataSource(dsc);
// 包配置
PackageConfig pc = new PackageConfig();
pc.setParent(BASE_PACKAGE);
pc.setEntity("entity");
pc.setMapper("mapper");
mpg.setPackageInfo(pc);
// 自定义配置
InjectionConfig cfg = new InjectionConfig() {
@Override
public void initMap() {
// to do nothing
}
};
// 如果模板引擎是 freemarker
String templatePath = "/templates/mapper.xml.ftl";
// 自定义输出配置
List<FileOutConfig> focList = new ArrayList<>();
// 自定义配置会被优先输出
focList.add(new FileOutConfig(templatePath) {
@Override
public String outputFile(TableInfo tableInfo) {
// 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
return projectPath + "/src/main/resources/mapper/" + pc.getModuleName()
+ "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
}
});
/*
cfg.setFileCreate(new IFileCreate() {
@Override
public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
// 判断自定义文件夹是否需要创建
checkDir("调用默认方法创建的目录，自定义目录用");
if (fileType == FileType.MAPPER) {
// 已经生成 mapper 文件判断存在，不想重新生成返回 false
return !new File(filePath).exists();
}
// 允许生成模板文件
return true;
}
});
*/
cfg.setFileOutConfigList(focList);
mpg.setCfg(cfg);
// 配置模板
TemplateConfig templateConfig = new TemplateConfig();
templateConfig.setService(null);
templateConfig.setServiceImpl(null);
templateConfig.setController(null);
templateConfig.setXml(null);
mpg.setTemplate(templateConfig);
// 策略配置
StrategyConfig strategy = new StrategyConfig();
strategy.setNaming(NamingStrategy.underline_to_camel);
strategy.setColumnNaming(NamingStrategy.underline_to_camel);
strategy.setEntityLombokModel(true);
strategy.setEntitySerialVersionUID(false);
strategy.setInclude(INCLUDE_TABLES);
strategy.setTablePrefix("tb_");
mpg.setStrategy(strategy);
mpg.setTemplateEngine(new FreemarkerTemplateEngine());
mpg.execute();
}
}
Note: User.java、UserMapper.java、UserMapper.xml 运行 CodeGenerator 的 main 方法后自动生成。
SRC
Application.java
package org.fool.shardingtablerw;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("org.fool.shardingtablerw.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
UserService.java
package org.fool.shardingtablerw.service;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import lombok.extern.slf4j.Slf4j;
import org.fool.shardingtablerw.entity.User;
import org.fool.shardingtablerw.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;
@Service
@Slf4j
public class UserService {
@Autowired
private UserMapper userMapper;
@Transactional(rollbackFor = Exception.class)
public int addUser(User user) {
user.setCreateBy("admin");
user.setUpdateBy("admin");
log.info("user: {}", user);
return userMapper.insert(user);
}
public List<User> getAllUsers() {
return userMapper.selectList(Wrappers.lambdaQuery());
}
}
UserController.java
package org.fool.shardingtablerw.controller;
import lombok.extern.slf4j.Slf4j;
import org.fool.shardingtablerw.entity.User;
import org.fool.shardingtablerw.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
import java.util.Random;
@RestController
@Slf4j
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/get")
public List<User> get() {
return userService.getAllUsers();
}
@PostMapping("/add/{count}")
public String add(@PathVariable int count) {
int result = 0;
for (int i = 0; i < count; i++) {
User user = new User();
user.setUsername("username" + i);
user.setPassword("password" + i);
user.setAge(new Random().nextInt(100));
result += userService.addUser(user);
}
return result == count ? "SUCCESS" : "FAILURE";
}
}
Test
add
curl --location --request POST 'http://localhost:8080/add/100'
Note: add to master
get
http://localhost:8080/get
Note：逻辑 SQL 是一条，实际上拆分成了 3 条 SQL 分别去查询 test_slave 数据库中的 3 张表
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
