Java ShardingJDBC實戰演練

 <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-jdbc-core-spring-boot-starter</artifactId>
            <version>5.0.0-beta</version>
        </dependency>

#端口
server.port=8080
 
# 數據源ds0
spring.shardingsphere.datasource.name=ds0
# 數據源ds0的配置
spring.shardingsphere.datasource.ds0.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.ds0.driverClassName=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.ds0.url=jdbc:mysql://localhost:3306/world1?characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2b8
spring.shardingsphere.datasource.ds0.username=root
spring.shardingsphere.datasource.ds0.password=123456
 
# 分片規則，這裡隻分表，所以僅指定表的分片規則
spring.shardingsphere.rules.sharding.tables.record_order_log.actual-data-nodes=ds0.record_order_log_$->{2021..2031}0$->{1..4}
 
# 指定數據庫的分片鍵，隻有一個庫所以還是用分表的分片鍵
spring.shardingsphere.rules.sharding.tables.record_order_log.database-strategy.standard.sharding-column=order_delivery_id
spring.shardingsphere.rules.sharding.tables.record_order_log.database-strategy.standard.sharding-algorithm-name=database-inline
 
# 指定分表的分片鍵
spring.shardingsphere.rules.sharding.tables.record_order_log.table-strategy.standard.sharding-column=order_delivery_id
spring.shardingsphere.rules.sharding.tables.record_order_log.table-strategy.standard.sharding-algorithm-name=table-inline
 
# Omit t_order_item table rule configuration ...
# ...
 
# 分片規則（默認取模）
spring.shardingsphere.rules.sharding.sharding-algorithms.database-inline.type=INLINE
spring.shardingsphere.rules.sharding.sharding-algorithms.database-inline.props.algorithm-expression=ds0
spring.shardingsphere.rules.sharding.sharding-algorithms.table-inline.type=CLASS_BASED
spring.shardingsphere.rules.sharding.sharding-algorithms.table-inline.props.strategy=STANDARD
spring.shardingsphere.rules.sharding.sharding-algorithms.table-inline.props.algorithmClassName=com.cus.shd.sharingjdbc.config.OrderDeliveryIdShardingAlgorithm
spring.shardingsphere.props.sql.show=true
 
#mybatis-plus??
mybatis-plus.mapper-locations=classpath:mappers/*.xml
mybatis-plus.type-aliases-package=com.cus.shd.sharingjdbc.model
mybatis-plus.configuration.map-underscore-to-camel-case=true
# sql??
mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
#本地數據庫鏈接，忽略瞭springboot自動加載後失效
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/world1?characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2b8
spring.datasource.username=root
spring.datasource.password=123456

package com.cus.shd.sharingjdbc.config;
 
import org.apache.commons.lang.StringUtils;
import org.apache.shardingsphere.sharding.api.sharding.ShardingAutoTableAlgorithm;
import org.apache.shardingsphere.sharding.api.sharding.standard.PreciseShardingValue;
import org.apache.shardingsphere.sharding.api.sharding.standard.RangeShardingValue;
import org.apache.shardingsphere.sharding.api.sharding.standard.StandardShardingAlgorithm;
 
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.util.Collection;
 
/**
 * @author ASUS
 * @Description 自定義分片策略
 * @Date 2021/11/6 22:20
 **/
 
public class OrderDeliveryIdShardingAlgorithm implements StandardShardingAlgorithm<Long> {
 
    @Override
    public String doSharding(Collection<String> availableTargetNames, PreciseShardingValue<Long> shardingValue) {
        String orderDeliveryId = shardingValue.getValue().toString();
        orderDeliveryId = orderDeliveryId.substring(0,orderDeliveryId.length() - 4);
        // 將時間戳轉為當前時間
        LocalDateTime localDateTime = LocalDateTime.ofEpochSecond(Long.valueOf(orderDeliveryId)/1000, 0, ZoneOffset.ofHours(8));
        String availableTargetName;
        int month = localDateTime.getMonthValue();
        LocalDateTime nowTime = LocalDateTime.now();
        int year = nowTime.getYear();
        if(month >= 1 && month < 3){
            availableTargetName = "01";
        }else if(month >= 3 && month < 6){
            availableTargetName = "02";
        }else if(month >= 6 && month < 9){
            availableTargetName = "03";
        }else {
            availableTargetName = "04";
        }
        if(StringUtils.isEmpty(availableTargetName)){
            return null;
        }
        return String.format("%s_%s%s",shardingValue.getLogicTableName(),year,availableTargetName);
    }
 
    @Override
    public Collection<String> doSharding(Collection<String> availableTargetNames, RangeShardingValue<Long> shardingValue) {
        return availableTargetNames;
    }
 
    @Override
    public void init() {
 
    }
 
    @Override
    public String getType() {
        return "ORDER_DELIVERY_ID";
    }
}

<update id="createNewTable" parameterType="String">
        CREATE TABLE ${tableName} SELECT * FROM record_order_log WHERE 1=2
    </update>