springBoot 整合 sharding-jdbc Jpa 分库分表

项目结构：

application.properties 文件配置：

##Jpa配置
spring.jpa.database=mysql
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none

##数据库配置
##数据库acnew地址
acnew.url=jdbc:mysql://localhost:3306/acnew?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai
##数据库acnew用户名
acnew.username=root
##数据库acnew密码
acnew.password=root
##数据库acnew驱动
acnew.driverClassName=com.mysql.cj.jdbc.Driver
##数据库acnew名称
acnew.databaseName=acnew

##数据库acold地址
acold.url=jdbc:mysql://localhost:3306/acold?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai
##数据库acold用户名
acold.username=root
##数据库acold密码
acold.password=root
##数据库acold驱动
acold.driverClassName=com.mysql.cj.jdbc.Driver
##数据库acold名称
acold.databaseName=acold

 1.Controller层 ：

package com..web;

import com.dangdang.ddframe.rdb.sharding.keygen.KeyGenerator;
import com..dao.Save;
import com..service.SaveInfoMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.repository.query.Param;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;

@RestController
public class SaveController {

    @Autowired
    private SaveInfoMapper saveInfoMapper;

    //http://localhost:8080/save
    @GetMapping("save")
    public String save(){
        long time = System.currentTimeMillis();
        for(int i= 1 ; i <= 40 ; i ++){
            Save save = new Save();
            save.setId((long) i);
            save.setUsername( "shangpin" + i);
            save.setApplyno(i+1+"");
            save.setType((long) (i+1));
            Save save1= saveInfoMapper.save(save);
            System.out.println(save1);
        }
        return "success";
    }

    //http://localhost:8080/selectAll
    @GetMapping("selectAll")
    public List<Save> select(){
        return saveInfoMapper.findAll();
    }

    //http://localhost:8080/select
    @GetMapping("select")
    public List<Save> select(String id){
        return saveInfoMapper.findAllByIdBetween(21L,39L);
    }

    //http://localhost:8080/find?id=1
    @GetMapping("find")
    public Object find(@Param("id") Long id){
        System.out.println(id);
    List<Long> list = new ArrayList<>();
        list.add(id);
        return saveInfoMapper.findAllByIdIn(list);
    }

    //http://localhost:8080/delete
    @GetMapping("delete")
    public void delete(String id){
         saveInfoMapper.deleteAll();
    }
}

2.数据表实体类：

package com..dao;

import lombok.Data;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import java.sql.Date;

@Entity
@Table(name="save")
@Data
public class Save {

    @Id
    private Long id;

    private String applyno;

    private String username;

    private String usernumber;

    private String address;

    private Long type;

    private String count;

}

3. 数据表接口类：

package com..service;

import com..dao.Save;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Component;

import java.util.List;


public interface SaveInfoMapper extends JpaRepository<Save,String> {

    List<Save> findAllByIdBetween(Long id1,Long id2);

    List<Save> findAllByIdIn(List<Long> id);

}

4.两个数据库配置类：

acnew：


package com..database;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import javax.sql.DataSource;

@Component
@ConfigurationProperties(prefix = "acnew")
public class Ac_newConfig {

    private String url;
    private String username;
    private String password;
    private String databaseName;
    private String driverClassName;

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public String getDatabaseName() {
        return databaseName;
    }

    public void setDatabaseName(String databaseName) {
        this.databaseName = databaseName;
    }
    
    public DataSource createDataSource() {
        DruidDataSource result = new DruidDataSource();
        result.setDriverClassName(getDriverClassName());
        result.setUrl(getUrl());
        result.setUsername(getUsername());
        result.setPassword(getPassword());
        return result;
    }
}
acold：


package com..database;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import javax.sql.DataSource;

@Component
@ConfigurationProperties(prefix = "acold")
public class Ac_oldConfig {

    private String url;
    private String username;
    private String password;
    private String databaseName;
    private String driverClassName;

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public String getDatabaseName() {
        return databaseName;
    }

    public void setDatabaseName(String databaseName) {
        this.databaseName = databaseName;
    }

    public DataSource createDataSource() {
        DruidDataSource result = new DruidDataSource();
        result.setDriverClassName(getDriverClassName());
        result.setUrl(getUrl());
        result.setUsername(getUsername());
        result.setPassword(getPassword());
        return result;
    }
}

5.分库分表策略类：

分库:
/**
 * 这里使用的都是单键分片策略
 * 示例分库策略是：
 * id<=20使用acnew库
 * 其余使用acold库
 */

package com..config;

import com.dangdang.ddframe.rdb.sharding.api.ShardingValue;
import com.dangdang.ddframe.rdb.sharding.api.strategy.database.SingleKeyDatabaseShardingAlgorithm;
import com.google.common.collect.Range;
import com..database.Ac_newConfig;
import com..database.Ac_oldConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.Collection;
import java.util.LinkedHashSet;

@Component
public class FkShardingAlgorithm implements SingleKeyDatabaseShardingAlgorithm<Long> {

    @Autowired
    private Ac_newConfig ac_newConfig;

    @Autowired
    private Ac_oldConfig ac_OldConfig;
    @Override
    public String doEqualSharding(final Collection<String> availableTargetNames,final ShardingValue<Long> shardingValue) {

        Long value = shardingValue.getValue();
        if (value <= 20L) {
            return ac_newConfig.getDatabaseName();
        } else {
            return ac_OldConfig.getDatabaseName();
        }
    }

    @Override
    public Collection<String> doInSharding(final Collection<String> availableTargetNames,final ShardingValue<Long> shardingValue) {

        Collection<String> result = new LinkedHashSet<>(availableTargetNames.size());
        for (Long value : shardingValue.getValues()) {
            if (value <= 20L) {
                result.add(ac_newConfig.getDatabaseName());
            } else {
                result.add(ac_OldConfig.getDatabaseName());
            }
        }
        return result;
    }

    @Override
    public Collection<String> doBetweenSharding(final Collection<String> availableTargetNames,
                                                final ShardingValue<Long> shardingValue) {
        Collection<String> result = new LinkedHashSet<>(availableTargetNames.size());
        Range<Long> range = shardingValue.getValueRange();
        for (Long value = range.lowerEndpoint(); value <= range.upperEndpoint(); value++) {
            if (value <= 20L) {
                result.add(ac_newConfig.getDatabaseName());
            } else {
                result.add(ac_OldConfig.getDatabaseName());
            }
        }
        return result;
    }
}


分表：
/**
 * 这里使用的都是单键分片策略
 * 示例分表策略是：
 * type为奇数使用one表
 * type为偶数使用two表
 */

package com..config;

import com.dangdang.ddframe.rdb.sharding.api.ShardingValue;
import com.dangdang.ddframe.rdb.sharding.api.strategy.database.SingleKeyDatabaseShardingAlgorithm;
import com.dangdang.ddframe.rdb.sharding.api.strategy.table.SingleKeyTableShardingAlgorithm;
import com.google.common.collect.Range;
import org.springframework.stereotype.Component;
import java.util.Collection;
import java.util.LinkedHashSet;

@Component
public class FbShardingAlgorithm implements SingleKeyTableShardingAlgorithm<Long> {

    @Override
    public String doEqualSharding(final Collection<String> tableNames,final ShardingValue<Long> shardingValue) {

        for(String table : tableNames){
            System.out.println(table+"---"+shardingValue);
            System.out.println(shardingValue.getValue()%2+"");
            if("0".endsWith(shardingValue.getValue()%2+"")){
                return "one";
            }else{
                return "two";
            }
        }
        throw new IllegalArgumentException("无分表参数 无法定位具体数据表");
    }

    @Override
    public Collection<String> doInSharding(final Collection<String> tableNames,final ShardingValue<Long> shardingValue) {

        Collection<String> result = new LinkedHashSet<>(tableNames.size());
        for (Long value : shardingValue.getValues()) {
            for (String tableName : tableNames) {
                if (tableName.endsWith(String.valueOf(value))) {
                    result.add(tableName);
                }
            }
        }
        return result;
    }

    @Override
    public Collection<String> doBetweenSharding(final Collection<String> tableNames,final ShardingValue<Long> shardingValue) {

        Collection<String> result = new LinkedHashSet<>(tableNames.size());
        Range<Long> range = shardingValue.getValueRange();
        for (Long i = range.lowerEndpoint(); i <= range.upperEndpoint(); i++) {
            for (String each : tableNames) {
                if (each.endsWith(i % 2 + "")) {
                    result.add(each);
                }
            }
        }
        return result;
    }
}

实现类：

package com..config;

import com.dangdang.ddframe.rdb.sharding.api.ShardingDataSourceFactory;
import com.dangdang.ddframe.rdb.sharding.api.rule.DataSourceRule;
import com.dangdang.ddframe.rdb.sharding.api.rule.ShardingRule;
import com.dangdang.ddframe.rdb.sharding.api.rule.TableRule;
import com.dangdang.ddframe.rdb.sharding.api.strategy.database.DatabaseShardingStrategy;
import com.dangdang.ddframe.rdb.sharding.api.strategy.table.TableShardingStrategy;
import com.dangdang.ddframe.rdb.sharding.keygen.DefaultKeyGenerator;
import com.dangdang.ddframe.rdb.sharding.keygen.KeyGenerator;
import com..database.Ac_newConfig;
import com..database.Ac_oldConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

@Configuration
public class FkFbShardingAlgorithm {

    @Autowired
    private Ac_newConfig ac_newConfig;

    @Autowired
    private Ac_oldConfig ac_OldConfig;

    @Autowired
    private FbShardingAlgorithm fbShardingAlgorithm;

    @Autowired
    private FkShardingAlgorithm fkShardingAlgorithm;

    @Bean
    public DataSource getDataSource() throws SQLException {
        return buildDataSource();
    }

    private DataSource buildDataSource() throws SQLException {

        //分库设置
        Map<String,DataSource>  dataSourcemap = new HashMap<>(2);

        //添加两个数据库 Ac_new 和 Ac_old
        dataSourcemap.put(ac_newConfig.getDatabaseName(),ac_newConfig.createDataSource());
        dataSourcemap.put(ac_OldConfig.getDatabaseName(),ac_OldConfig.createDataSource());
        //设置默认数据库（Ac_new）
        DataSourceRule dataSourceRule = new DataSourceRule(dataSourcemap,ac_newConfig.getDatabaseName());

        //分表设置，大致思想就是将查询虚拟表Save根据一定规则映射到真实表中去
        TableRule orderTableRule = TableRule.builder("save")
                .actualTables(Arrays.asList("one", "two"))
                .dataSourceRule(dataSourceRule)
                .build();

        //分库分表策略
        ShardingRule shardingRule = ShardingRule.builder()
                .dataSourceRule(dataSourceRule)
                .tableRules(Arrays.asList(orderTableRule))
                .databaseShardingStrategy(new DatabaseShardingStrategy("id", fkShardingAlgorithm))
                .tableShardingStrategy(new TableShardingStrategy("type",fbShardingAlgorithm)).build();

        DataSource dataSource = ShardingDataSourceFactory.createDataSource(shardingRule);
        return dataSource;

    }

    @Bean
    public KeyGenerator keyGenerator() {
        return new DefaultKeyGenerator();
    }
}

最后,pom文件配置：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.</groupId>
    <artifactId>ac-fkfb</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>ac-fkfb</name>
    <description>Spring Boot fkfb</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--导入配置文件处理器，配置文件进行绑定就会有提示 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- mysql:MyBatis相关依赖
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.4.0</version>
            <type>maven-plugin</type>
        </dependency>   -->

        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- mysql:mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- mysql:阿里巴巴数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.9</version>
        </dependency>
        <!-- sharding-jdbc -->
        <dependency>
            <groupId>com.dangdang</groupId>
            <artifactId>sharding-jdbc-core</artifactId>
            <version>1.5.4</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>
【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/lifan12589/p/14252941.html