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sharding-jdbc四種分片策略使用詳解

 更新時(shí)間：2025年12月08日 08:38:24   作者：帥宇Yeah~  
本文介紹了四種分片策略：標(biāo)準(zhǔn)分片、行表達(dá)式分片、復(fù)合分片和Hint分片,每種策略都提供了配置文件示例和解釋,以幫助用戶更好地理解和使用分片技術(shù)

標(biāo)準(zhǔn)分片策略（standard）

1、精確分片

配置文件

spring:
  shardingsphere:
    #開啟sql顯示
    props:
      sql:
        show: true
    datasource:
      # 配置數(shù)據(jù)源
      names: db0,db1
      db0:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_0?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
      db1:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_1?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
    sharding:
      #唯一庫數(shù)據(jù)
      default-data-source-name: db0
      #分庫
      default-database-strategy:
        standard:
          # 添加數(shù)據(jù)分庫字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
          sharding-column: id
          #精確分片
          precise-algorithm-class-name: com.example.sharding_test.strategy.database.DatabasePreciseAlgorithm
      #分表
      tables:
        #表名
        db_user:
          actual-data-nodes: db$->{0..1}.db_user_$->{0..2}
          key-generator:
            column: id  # 主鍵ID
            type: SNOWFLAKE  # 生成策略雪花id
          table-strategy:
            standard:
              sharding-column: id
              #精確分片
              precise-algorithm-class-name: com.example.sharding_test.strategy.table.TablePreciseAlgorithm

分庫規(guī)則

package com.example.sharding_test.strategy.database;

import org.apache.shardingsphere.api.sharding.standard.PreciseShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.standard.PreciseShardingValue;

import java.util.Collection;

/**
 * 精確分片
 *
 * @author shuai
 * @since 2023-03-19
 */
public class DatabasePreciseAlgorithm implements PreciseShardingAlgorithm<Long> {
    /**
     * 精確分片
     * @param collection 數(shù)據(jù)源集合
     * @param preciseShardingValue 分片參數(shù)
     * @return 數(shù)據(jù)庫
     */
    @Override
    public String doSharding(Collection<String> collection, PreciseShardingValue<Long> preciseShardingValue) {
        //分片鍵的值
        Long value = preciseShardingValue.getValue();
        String dbName = "db" + (value % 2);
        if(!collection.contains(dbName)){
           throw new UnsupportedOperationException("數(shù)據(jù)源"+ dbName + "不存在");
        }
        return dbName;
    }
}

分表規(guī)則

package com.example.sharding_test.strategy.table;

import org.apache.shardingsphere.api.sharding.standard.PreciseShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.standard.PreciseShardingValue;

import java.util.Collection;

/**
 * 精確分片
 *
 * @author shuai
 * @since 2023-03-19
 */
public class TablePreciseAlgorithm implements PreciseShardingAlgorithm<Long> {
    /**
     * 精確分片
     * @param collection 數(shù)據(jù)源集合
     * @param preciseShardingValue 分片參數(shù)
     * @return 數(shù)據(jù)庫
     */
    @Override
    public String doSharding(Collection<String> collection, PreciseShardingValue<Long> preciseShardingValue) {
        //分片鍵的值
        Long value = preciseShardingValue.getValue();
        String tableName = preciseShardingValue.getLogicTableName() + "_" + (value % 3);
        if(!collection.contains(tableName)){
           throw new UnsupportedOperationException("表"+ tableName + "不存在");
        }
        return tableName;
    }
}

2、范圍分片

配置文件

spring:
  shardingsphere:
    #開啟sql顯示
    props:
      sql:
        show: true
    datasource:
      # 配置數(shù)據(jù)源
      names: db0,db1
      db0:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_0?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
      db1:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_1?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
    sharding:
      #唯一庫數(shù)據(jù)
      default-data-source-name: db0
      #分庫
      default-database-strategy:
        standard:
          # 添加數(shù)據(jù)分庫字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
          sharding-column: id
          #精確分片
          precise-algorithm-class-name: com.example.sharding_test.strategy.database.DatabasePreciseAlgorithm
          #范圍分片
          range-algorithm-class-name: com.example.sharding_test.strategy.database.DatabaseRangeAlgorithm          
      #分表
      tables:
        #表名
        db_user:
          actual-data-nodes: db$->{0..1}.db_user_$->{0..2}
          key-generator:
            column: id  # 主鍵ID
            type: SNOWFLAKE  # 生成策略雪花id
          table-strategy:
            standard:
              sharding-column: id
              #精確分片
              precise-algorithm-class-name: com.example.sharding_test.strategy.table.TablePreciseAlgorithm
              #范圍分片
              range-algorithm-class-name: com.example.sharding_test.strategy.table.TableRangeAlgorithm

分庫規(guī)則

package com.example.sharding_test.strategy.database;

import org.apache.shardingsphere.api.sharding.standard.RangeShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.standard.RangeShardingValue;

import java.util.Collection;

/**
 * 范圍分片
 *
 * @author shuai
 * @since 2023-03-19
 */
public class DatabaseRangeAlgorithm implements RangeShardingAlgorithm<Long> {
    /**
     * 范圍分片
     * @param collection 數(shù)據(jù)源集合
     * @param rangeShardingValue 分片參數(shù)
     * @return 直接返回源
     */
    @Override
    public Collection<String> doSharding(Collection<String> collection, RangeShardingValue<Long> rangeShardingValue) {
        return collection;
    }
}

分表規(guī)則

package com.example.sharding_test.strategy.table;

import org.apache.shardingsphere.api.sharding.standard.RangeShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.standard.RangeShardingValue;

import java.util.Arrays;
import java.util.Collection;

/**
 * 范圍分片
 *
 * @author shuai
 * @since 2023-03-19
 */
public class TableRangeAlgorithm implements RangeShardingAlgorithm<Long> {
    /**
     * 范圍分片
     * @param collection 數(shù)據(jù)源集合
     * @param rangeShardingValue 分片參數(shù)
     * @return 直接返回源
     */
    @Override
    public Collection<String> doSharding(Collection<String> collection, RangeShardingValue<Long> rangeShardingValue) {
        //邏輯表名稱
        String logicTableName = rangeShardingValue.getLogicTableName();
        return Arrays.asList(logicTableName+"_0",logicTableName+"_1",logicTableName+"_2");
    }
}

行表達(dá)式分片策略（inline）

配置文件（需要注釋其他的分片規(guī)則）

spring:
  shardingsphere:
    #開啟sql顯示
    props:
      sql:
        show: true
    datasource:
      # 配置數(shù)據(jù)源
      names: db0,db1
      db0:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_0?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
      db1:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_1?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
    sharding:
      #唯一庫數(shù)據(jù)
      default-data-source-name: db0
      #分庫
      default-database-strategy:
#        standard:
#          # 添加數(shù)據(jù)分庫字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
#          sharding-column: id
#          #精確分片
#          precise-algorithm-class-name: com.example.sharding_test.strategy.database.DatabasePreciseAlgorithm
#          #范圍分片
#          range-algorithm-class-name: com.example.sharding_test.strategy.database.DatabaseRangeAlgorithm
        inline:
          # 添加數(shù)據(jù)分表字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
          sharding-column: id
          # 分片算法表達(dá)式 => 通過id取余
          algorithm-expression: db$->{id % 2}
      #分表
      tables:
        #表名
        db_user:
          actual-data-nodes: db$->{0..1}.db_user_$->{0..2}
          key-generator:
            column: id  # 主鍵ID
            type: SNOWFLAKE  # 生成策略雪花id
          table-strategy:
#            standard:
#              sharding-column: id
#              #精確分片
#              precise-algorithm-class-name: com.example.sharding_test.strategy.table.TablePreciseAlgorithm
#              #范圍分片
#              range-algorithm-class-name: com.example.sharding_test.strategy.table.TableRangeAlgorithm
            inline:
              # 添加數(shù)據(jù)分表字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
              sharding-column: id
              # 分片算法表達(dá)式 => 通過id取余
              algorithm-expression: db_user_$->{id % 3}

分庫規(guī)則與分表規(guī)則可直接使用groovy腳本

例：db_user_$->{id % 3}

復(fù)合分片策略（complex）

配置文件

spring:
  shardingsphere:
    #開啟sql顯示
    props:
      sql:
        show: true
    datasource:
      # 配置數(shù)據(jù)源
      names: db0,db1
      db0:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_0?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
      db1:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_1?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
    sharding:
      #唯一庫數(shù)據(jù)
      default-data-source-name: db0
      #分庫
      default-database-strategy:
#        standard:
#          # 添加數(shù)據(jù)分庫字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
#          sharding-column: id
#          #精確分片
#          precise-algorithm-class-name: com.example.sharding_test.strategy.database.DatabasePreciseAlgorithm
#          #范圍分片
#          range-algorithm-class-name: com.example.sharding_test.strategy.database.DatabaseRangeAlgorithm
#        #行分片
#        inline:
#          # 添加數(shù)據(jù)分表字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
#          sharding-column: id
#          # 分片算法表達(dá)式 => 通過id取余
#          algorithm-expression: db$->{id % 2}
        #復(fù)合分片
         complex:
           sharding-columns: id,age
           algorithm-class-name: com.example.sharding_test.strategy.database.DatabaseComplexAlgorithm

      #分表
      tables:
        #表名
        db_user:
          actual-data-nodes: db$->{0..1}.db_user_$->{0..2}
          key-generator:
            column: id  # 主鍵ID
            type: SNOWFLAKE  # 生成策略雪花id
          table-strategy:
#            standard:
#              sharding-column: id
#              #精確分片
#              precise-algorithm-class-name: com.example.sharding_test.strategy.table.TablePreciseAlgorithm
#              #范圍分片
#              range-algorithm-class-name: com.example.sharding_test.strategy.table.TableRangeAlgorithm
#            inline:
#              # 添加數(shù)據(jù)分表字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
#              sharding-column: id
#              # 分片算法表達(dá)式 => 通過id取余
#              algorithm-expression: db_user_$->{id % 3}
            #復(fù)合分片
            complex:
              sharding-columns: id,age
              algorithm-class-name: com.example.sharding_test.strategy.table.TableComplexAlgorithm

分庫規(guī)則

package com.example.sharding_test.strategy.database;

import org.apache.shardingsphere.api.sharding.complex.ComplexKeysShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.complex.ComplexKeysShardingValue;
import org.apache.shardingsphere.api.sharding.standard.RangeShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.standard.RangeShardingValue;
import org.assertj.core.util.Lists;

import java.util.Collection;
import java.util.List;

/**
 * 復(fù)合分片
 *
 * @author shuai
 * @since 2023-03-19
 */
public class DatabaseComplexAlgorithm implements ComplexKeysShardingAlgorithm<Integer> {


    /**
     *
     * @param collection 數(shù)據(jù)源集合
     * @param complexKeysShardingValue 分片鍵的值集合
     * @return 需要查找的數(shù)據(jù)源集合
     */
    @Override
    public Collection<String> doSharding(Collection<String> collection, ComplexKeysShardingValue<Integer> complexKeysShardingValue) {
        //獲取age的值
        Collection<Integer> ageValues = complexKeysShardingValue.getColumnNameAndShardingValuesMap().get("age");
        List<String> dbs = Lists.newArrayList();
        //通過age取模
        ageValues.forEach(item->{
            String dbName = "db"+((item+3)%2);
            dbs.add(dbName);
        });
        return dbs;
    }
}

分表規(guī)則

package com.example.sharding_test.strategy.table;

import org.apache.shardingsphere.api.sharding.complex.ComplexKeysShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.complex.ComplexKeysShardingValue;
import org.apache.shardingsphere.api.sharding.standard.RangeShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.standard.RangeShardingValue;
import org.assertj.core.util.Lists;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;

/**
 * 復(fù)合分片
 *
 * @author shuai
 * @since 2023-03-19
 */
public class TableComplexAlgorithm implements ComplexKeysShardingAlgorithm<Integer> {

    @Override
    public Collection<String> doSharding(Collection<String> collection, ComplexKeysShardingValue<Integer> complexKeysShardingValue) {
        //獲取age的值
        Collection<Integer> ageValues = complexKeysShardingValue.getColumnNameAndShardingValuesMap().get("age");
        List<String> dbs = Lists.newArrayList();
        //通過age取模
        ageValues.forEach(item->{
            String dbName = "db_user_"+((item+3)%3);
            dbs.add(dbName);
        });
        return dbs;
    }
}

Hint分片策略（hint）

配置文件（需要注釋其他的分片規(guī)則）

spring:
  shardingsphere:
    #開啟sql顯示
    props:
      sql:
        show: true
    datasource:
      # 配置數(shù)據(jù)源
      names: db0,db1
      db0:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_0?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
      db1:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/sharding_test_1?useUnicode=true&character_set_server=utf8mb4&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
        username: root
        password: root
    sharding:
      #唯一庫數(shù)據(jù)
      default-data-source-name: db0
      #分庫
      default-database-strategy:
#        standard:
#          # 添加數(shù)據(jù)分庫字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
#          sharding-column: id
#          #精確分片
#          precise-algorithm-class-name: com.example.sharding_test.strategy.database.DatabasePreciseAlgorithm
#          #范圍分片
#          range-algorithm-class-name: com.example.sharding_test.strategy.database.DatabaseRangeAlgorithm
        #行分片
        inline:
          # 添加數(shù)據(jù)分表字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
          sharding-column: id
          # 分片算法表達(dá)式 => 通過id取余
          algorithm-expression: db$->{id % 2}
#        #復(fù)合分片
#         complex:
#           sharding-columns: id,age
#           algorithm-class-name: com.example.sharding_test.strategy.database.DatabaseComplexAlgorithm

      #分表
      tables:
        #表名
        db_user:
          actual-data-nodes: db$->{0..1}.db_user_$->{0..2}
          key-generator:
            column: id  # 主鍵ID
            type: SNOWFLAKE  # 生成策略雪花id
          table-strategy:
#            standard:
#              sharding-column: id
#              #精確分片
#              precise-algorithm-class-name: com.example.sharding_test.strategy.table.TablePreciseAlgorithm
#              #范圍分片
#              range-algorithm-class-name: com.example.sharding_test.strategy.table.TableRangeAlgorithm
#            inline:
#              # 添加數(shù)據(jù)分表字段(根據(jù)字段插入數(shù)據(jù)到那個(gè)表)
#              sharding-column: id
#              # 分片算法表達(dá)式 => 通過id取余
#              algorithm-expression: db_user_$->{id % 3}
#            #復(fù)合分片
#            complex:
#              sharding-columns: id,age
#              algorithm-class-name: com.example.sharding_test.strategy.table.TableComplexAlgorithm
            #強(qiáng)制分片
            hint:
              algorithm-class-name: com.example.sharding_test.strategy.table.TableHintAlgorithm

分表規(guī)則

package com.example.sharding_test.strategy.table;

import org.apache.shardingsphere.api.sharding.hint.HintShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.hint.HintShardingValue;

import java.util.Arrays;
import java.util.Collection;

/**
 * 精確分片
 *
 * @author shuai
 * @since 2023-03-19
 */
public class TableHintAlgorithm implements HintShardingAlgorithm<Integer> {


    @Override
    public Collection<String> doSharding(Collection<String> collection, HintShardingValue<Integer> hintShardingValue) {
        String logicTableName = hintShardingValue.getLogicTableName();
        String dbName = logicTableName+"_"+hintShardingValue.getValues().toArray()[0];
        return Arrays.asList(dbName);
    }
}

測試hint

    @Test
    void selectHintData(){
        HintManager manager = HintManager.getInstance();
        manager.addTableShardingValue("db_user",2);
        LambdaQueryWrapper<DbUser> wrapper = Wrappers.lambdaQuery();
        wrapper.eq(DbUser::getAge,34);
        List<DbUser> dbUsers = dbUserMapper.selectList(wrapper);
        dbUsers.forEach(System.out::println);
    }

總結(jié)

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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