ShardingSphere's public table combat (7)

概述

场景

• What is a common table？
  存储固定数据的表,The data in the table is seldom change,查询时经常进行关联,比如字典表.
• Each database to create the same structure of common table.

SpringBoot环境搭建

参考ShardingSphere之水平分表实战（三）

建表

In multiple databases are created the same common table structure.

CREATE TABLE `t_udict` (
  `dictid` BIGINT(11) NOT NULL PRIMARY KEY,
  `ustatus` varchar(255) DEFAULT NULL,
  `uvalue` varchar(255) DEFAULT NULL
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4;

application.properties配置

# 配置公共表
spring.shardingsphere.sharding.broadcast-tables=t_udict
spring.shardingsphere.sharding.tables.t_udict.key-generator.column=dictid
spring.shardingsphere.sharding.tables.t_udict.key-generator.type=SNOWFLAKE

编写代码

package com.study.shardingjdbcdemo.entity;

import lombok.Data;

import javax.persistence.Id;
import javax.persistence.Table;

@Data
@Table(name = "t_udict")
public class Udict {
    
    @Id
    private Long dictid;

    private String ustatus;

    private String uvalue;
}

package com.study.shardingjdbcdemo.mapper;

import com.study.shardingjdbcdemo.entity.Udict;
import org.springframework.stereotype.Repository;
import tk.mybatis.mapper.common.Mapper;

@Repository
public interface UdictMapper extends Mapper<Udict> {
    
}

测试代码

@Test
    public void addCommon() {
    
        Udict udict = new Udict();
        udict.setUvalue("已启用");
        udict.setUstatus("a");
        udictMapper.insertSelective(udict);
    }

    @Test
    public void deleteCommon() {
    
        udictMapper.deleteByPrimaryKey(760236497562501121l);
    }