springboot 整合 Shardingsphere 4.0

作者: Winter_Chen | 来源:发表于2020-04-21 13:46 被阅读0次

    最近Shardingsphere在Apache Software Foundation 简称ASF 毕业成为Apache顶级项目,也是目前ASF收个分布式数据库中间件项目,未来可期啊,今天我们就搭建一下springboot整合Shardingsphere4.0版本。

    依赖:

    • jdk1.8
    • maven3.6.3
    • mybatis plus
    • mysql8.0
    • Shardingsphere 4.0

    数据库的结构:

    --|
    |- ds0
    | |- t_order0
    | |- t_order1
    |
    |- ds1
    |- t_order0
    |- t_order1

    创建数据库

    数据库ds0

    CREATE DATABASE IF NOT EXISTS `ds0` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci */;
    USE `ds0`;
    
    SET NAMES utf8mb4;
    SET FOREIGN_KEY_CHECKS = 0;
    
    -- ----------------------------
    -- Table structure for t_order0
    -- ----------------------------
    DROP TABLE IF EXISTS `t_order0`;
    CREATE TABLE `t_order0`  (
      `order_id` bigint(0) NOT NULL COMMENT '订单号(主键)',
      `order_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '订单名称',
      `order_status` int(0) NULL DEFAULT NULL COMMENT '订单状态',
      `user_id` bigint(0) NOT NULL COMMENT '用户id',
      PRIMARY KEY (`order_id`) USING BTREE
    ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
    
    -- ----------------------------
    -- Table structure for t_order1
    -- ----------------------------
    DROP TABLE IF EXISTS `t_order1`;
    CREATE TABLE `t_order1`  (
      `order_id` bigint(0) NOT NULL COMMENT '订单号(主键)',
      `order_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '订单名称',
      `order_status` int(0) NULL DEFAULT NULL COMMENT '订单状态',
      `user_id` bigint(0) NOT NULL COMMENT '用户id',
      PRIMARY KEY (`order_id`) USING BTREE
    ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
    
    SET FOREIGN_KEY_CHECKS = 1;
    

    数据库ds1

    CREATE DATABASE IF NOT EXISTS `ds1` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci */;
    USE `ds1`;
    
    SET NAMES utf8mb4;
    SET FOREIGN_KEY_CHECKS = 0;
    
    -- ----------------------------
    -- Table structure for t_order0
    -- ----------------------------
    DROP TABLE IF EXISTS `t_order0`;
    CREATE TABLE `t_order0`  (
      `order_id` bigint(0) NOT NULL COMMENT '订单号(主键)',
      `order_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '订单名称',
      `order_status` int(0) NULL DEFAULT NULL COMMENT '订单状态',
      `user_id` bigint(0) NOT NULL COMMENT '用户id',
      PRIMARY KEY (`order_id`) USING BTREE
    ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
    
    -- ----------------------------
    -- Table structure for t_order1
    -- ----------------------------
    DROP TABLE IF EXISTS `t_order1`;
    CREATE TABLE `t_order1`  (
      `order_id` bigint(0) NOT NULL COMMENT '订单号(主键)',
      `order_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '订单名称',
      `order_status` int(0) NULL DEFAULT NULL COMMENT '订单状态',
      `user_id` bigint(0) NOT NULL COMMENT '用户id',
      PRIMARY KEY (`order_id`) USING BTREE
    ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
    
    SET FOREIGN_KEY_CHECKS = 1;
    

    pom.xml

    <?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>2.2.6.RELEASE</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
        <groupId>com.winterchen</groupId>
        <artifactId>shardingsphere-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>shardingsphere-demo</name>
        <description>shardingsphere demo</description>
    
        <properties>
            <java.version>1.8</java.version>
            <sharding-sphere.version>4.0.1</sharding-sphere.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <!--mysql,根据自己数据库版本进行相关调整,不然会报错-->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.13</version>
                <scope>runtime</scope>
            </dependency>
            <!--Mybatis-Plus-->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.1.1</version>
            </dependency>
            <!-- for spring boot -->
            <dependency>
                <groupId>org.apache.shardingsphere</groupId>
                <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
                <version>${sharding-sphere.version}</version>
            </dependency>
    
            <!-- for spring namespace -->
            <dependency>
                <groupId>org.apache.shardingsphere</groupId>
                <artifactId>sharding-jdbc-spring-namespace</artifactId>
                <version>${sharding-sphere.version}</version>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>
    
    

    注意:数据库驱动版本,请根据自己数据库版本进行相关调整,不然会报错

    项目配置

    application.properties

    server.port=8098
    
    # 数据源 ds0,ds1
    spring.shardingsphere.datasource.names=ds0,ds1
    # 第一个数据库
    spring.shardingsphere.datasource.ds0.type=com.zaxxer.hikari.HikariDataSource
    spring.shardingsphere.datasource.ds0.driver-class-name=com.mysql.cj.jdbc.Driver
    spring.shardingsphere.datasource.ds0.jdbc-url=jdbc:mysql://192.168.133.134:3306/ds0?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&characterSetResults=utf8&useSSL=false&verifyServerCertificate=false&autoReconnct=true&autoReconnectForPools=true&allowMultiQueries=true
    spring.shardingsphere.datasource.ds0.username=root
    spring.shardingsphere.datasource.ds0.password=root
    
    # 第二个数据库
    spring.shardingsphere.datasource.ds1.type=com.zaxxer.hikari.HikariDataSource
    spring.shardingsphere.datasource.ds1.driver-class-name=com.mysql.cj.jdbc.Driver
    spring.shardingsphere.datasource.ds1.jdbc-url=jdbc:mysql://192.168.133.134:3306/ds1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&characterSetResults=utf8&useSSL=false&verifyServerCertificate=false&autoReconnct=true&autoReconnectForPools=true&allowMultiQueries=true
    spring.shardingsphere.datasource.ds1.username=root
    spring.shardingsphere.datasource.ds1.password=root
    
    # 水平拆分的数据库(表) 配置分库 + 分表策略 行表达式分片策略
    # 分库策略
    spring.shardingsphere.sharding.default-database-strategy.inline.sharding-column=user_id
    spring.shardingsphere.sharding.default-database-strategy.inline.algorithm-expression=ds$->{user_id % 2}
    
    
    # 分表策略 其中t_order为逻辑表 分表主要取决于order_id行
    spring.shardingsphere.sharding.tables.t_order.actual-data-nodes=ds$->{0..1}.t_order$->{0..1}
    spring.shardingsphere.sharding.tables.t_order.table-strategy.inline.sharding-column=order_id
    spring.shardingsphere.sharding.tables.t_order.key-generator.column=order_id
    spring.shardingsphere.sharding.tables.t_order.key-generator.type=SNOWFLAKE
    
    # 分片算法表达式
    spring.shardingsphere.sharding.tables.t_order.table-strategy.inline.algorithm-expression=t_order$->{order_id % 2}
    
    
    # 打印执行的数据库以及语句
    spring.shardingsphere.props.sql.show=true
    spring.main.allow-bean-definition-overriding=true
    
    
    # mybatis-plus
    mybatis-plus.mapper-locations=classpath:/mapper/*.xml
    mybatis-plus.configuration.jdbc-type-for-null='null'
    
    
    

    注意:数据库连接配置、mybatis-plus扫包路径,需要根据实际情况进行改变

    以上的配置实现了分库分表,一下几点概念需要明白:

    逻辑表

    水平拆分的数据库(表)的相同逻辑和数据结构表的总称。例:订单数据根据主键尾数拆分为10张表,分别是t_order0到t_order9,他们的逻辑表名为t_order。

    真实表

    在分片的数据库中真实存在的物理表。即上个示例中的t_order0到t_order9。

    数据节点

    数据分片的最小单元。由数据源名称和数据表组成,例:ds0.t_order0。

    分片键

    用于分片的数据库字段,是将数据库(表)水平拆分的关键字段。例:将订单表中的订单主键的尾数取模分片,则订单主键为分片字段。 SQL中如果无分片字段,将执行全路由,性能较差。 除了对单分片字段的支持,ShardingSphere也支持根据多个字段进行分片。

    分片算法

    通过分片算法将数据分片,支持通过=、>=、<=、>、<、BETWEEN和IN分片。分片算法需要应用方开发者自行实现,可实现的灵活度非常高。

    目前提供4种分片算法。由于分片算法和业务实现紧密相关,因此并未提供内置分片算法,而是通过分片策略将各种场景提炼出来,提供更高层级的抽象,并提供接口让应用开发者自行实现分片算法。

    • 精确分片算法

    对应PreciseShardingAlgorithm,用于处理使用单一键作为分片键的=与IN进行分片的场景。需要配合StandardShardingStrategy使用。

    • 范围分片算法

    对应RangeShardingAlgorithm,用于处理使用单一键作为分片键的BETWEEN AND、>、<、>=、<=进行分片的场景。需要配合StandardShardingStrategy使用。

    • 复合分片算法

    对应ComplexKeysShardingAlgorithm,用于处理使用多键作为分片键进行分片的场景,包含多个分片键的逻辑较复杂,需要应用开发者自行处理其中的复杂度。需要配合ComplexShardingStrategy使用。

    • Hint分片算法

    对应HintShardingAlgorithm,用于处理使用Hint行分片的场景。需要配合HintShardingStrategy使用。

    分片策略

    包含分片键和分片算法,由于分片算法的独立性,将其独立抽离。真正可用于分片操作的是分片键 + 分片算法,也就是分片策略。目前提供5种分片策略。

    • 标准分片策略

    对应StandardShardingStrategy。提供对SQL语句中的=, >, <, >=, <=, IN和BETWEEN AND的分片操作支持。StandardShardingStrategy只支持单分片键,提供PreciseShardingAlgorithm和RangeShardingAlgorithm两个分片算法。PreciseShardingAlgorithm是必选的,用于处理=和IN的分片。RangeShardingAlgorithm是可选的,用于处理BETWEEN AND, >, <, >=, <=分片,如果不配置RangeShardingAlgorithm,SQL中的BETWEEN AND将按照全库路由处理。

    • 复合分片策略

    对应ComplexShardingStrategy。复合分片策略。提供对SQL语句中的=, >, <, >=, <=, IN和BETWEEN AND的分片操作支持。ComplexShardingStrategy支持多分片键,由于多分片键之间的关系复杂,因此并未进行过多的封装,而是直接将分片键值组合以及分片操作符透传至分片算法,完全由应用开发者实现,提供最大的灵活度。

    • 行表达式分片策略

    对应InlineShardingStrategy。使用Groovy的表达式,提供对SQL语句中的=和IN的分片操作支持,只支持单分片键。对于简单的分片算法,可以通过简单的配置使用,从而避免繁琐的Java代码开发,如: t_user_$->{u_id % 8} 表示t_user表根据u_id模8,而分成8张表,表名称为t_user_0到t_user_7。

    • Hint分片策略

    对应HintShardingStrategy。通过Hint指定分片值而非从SQL中提取分片值的方式进行分片的策略。

    • 不分片策略

    对应NoneShardingStrategy。不分片的策略。

    SQL Hint

    对于分片字段非SQL决定,而由其他外置条件决定的场景,可使用SQL Hint灵活的注入分片字段。例:内部系统,按照员工登录主键分库,而数据库中并无此字段。SQL Hint支持通过Java API和SQL注释(待实现)两种方式使用。

    自增主键生成策略

    通过在客户端生成自增主键替换以数据库原生自增主键的方式,做到分布式主键无重复。 采用UUID.randomUUID()的方式产生分布式主键。或者 SNOWFLAKE

    mybatis-plus

    mybatis-plus极大的提高了开发效率,简单的配置和使用mybatis-plus

    配置mybatis-plus的分页

    package com.winterchen.shardingspheredemo.configuration;
    
    
    @EnableTransactionManagement
    @Configuration
    @MapperScan("com.winterchen.shardingspheredemo.dao")
    public class MybatisPlusConfig {
    
        @Bean
        public PaginationInterceptor paginationInterceptor() {
            PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
            // 设置请求的页面大于最大页后操作, true调回到首页,false 继续请求  默认false
            // paginationInterceptor.setOverflow(false);
            // 设置最大单页限制数量,默认 500 条,-1 不受限制
            // paginationInterceptor.setLimit(500);
            // 开启 count 的 join 优化,只针对部分 left join
            paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize());
            return paginationInterceptor;
        }
    }
    

    配置自定义的通用mapper

    package com.winterchen.shardingspheredemo.configuration;
    
    import java.util.Map;
    
    public interface MyBaseMapper<T> extends BaseMapper<T> {
    
        IPage<T> selectAllByCondition(Page<?> page, @Param("condition")Map<String, Object> condition);
    
        int deleteById(@Param("condition")Map<String, Object> condition);
    
    }
    
    

    代码

    实体类

    package com.winterchen.shardingspheredemo.model;
    
    
    @TableName("t_order")
    public class OrderInfo {
    
        @TableId(value = "order_id")
        private Long orderId;
    
        @TableField(value = "order_name")
        private String orderName;
    
        @TableField(value = "order_status")
        private Integer orderStatus;
    
        @TableField(value = "user_id")
        private Long userId;
    
        //省略get/set
    }
    
    

    Mapper

    mapper

    package com.winterchen.shardingspheredemo.dao;
    
    
    public interface OrderMapper extends MyBaseMapper<OrderInfo> {
    
        IPage<OrderInfo> selectAllByCondition(Page<?> page, @Param("condition") Map<String, Object> condition);
    
        int deleteById(@Param("condition")Map<String, Object> condition);
    
    }
    
    

    mapper xml

    <?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    <mapper namespace="com.winterchen.shardingspheredemo.dao.OrderMapper">
        
        <sql id="Base_Column_List">
            order_id, order_name, order_status, user_id
        </sql>
        
        <select id="selectAllByCondition" resultType="com.winterchen.shardingspheredemo.model.OrderInfo">
            select
                <include refid="Base_Column_List"/>
            from
               t_order
            <where>
                <if test="condition.userId != null">
                    and user_id = #{condition.userId, jdbcType=BIGINT}
                </if>
                <if test="condition.orderId != null">
                    and order_id = #{condition.orderId, jdbcType=BIGINT}
                </if>
                <if test="condition.orderName != null and condition.orderName != ''">
                    and order_name like concat('%',#{condition.orderName,jdbcType=VARCHAR} ,'%')
                </if>
                <if test="condition.orderStatus != null">
                    and order_status = #{condition.orderStatus, jdbcType=INTEGER}
                </if>
            </where>
        </select>
    
        <delete id="deleteById">
            delete from t_order where order_id = #{condition.orderId, jdbcType=BIGINT} and user_id = #{condition.userId, jdbcType=BIGINT}
        </delete>
    
    </mapper>
    

    service

    package com.winterchen.shardingspheredemo.service;
    
    
    public interface OrderService extends IService<OrderInfo> {
    
        @Override
        boolean save(OrderInfo entity);
    
        @Override
        boolean removeById(Serializable id);
    
        @Override
        boolean updateById(OrderInfo entity);
    
        IPage<OrderInfo> pageOrderInfos(Page<?> page, OrderInfo orderInfo);
    
    }
    
    
    package com.winterchen.shardingspheredemo.service.impl;
    
    
    @Service
    public class OrderServiceImpl extends ServiceImpl<OrderMapper, OrderInfo> implements OrderService {
    
    
        @Override
        public boolean save(OrderInfo entity) {
            return super.save(entity);
        }
    
        @Override
        public boolean removeById(Serializable id) {
            return super.removeById(id);
        }
    
        @Override
        public boolean updateById(OrderInfo entity) {
            return super.updateById(entity);
        }
    
    
        @Override
        public IPage<OrderInfo> pageOrderInfos(Page<?> page, OrderInfo orderInfo) {
            Map<String, Object> map = new HashMap<>();
            map.put("userId", orderInfo.getUserId());
            map.put("orderId", orderInfo.getOrderId());
            map.put("orderName", orderInfo.getOrderName());
            map.put("orderStatus", orderInfo.getOrderStatus());
            return super.baseMapper.selectAllByCondition(page, map);
        }
    }
    
    

    controller

    package com.winterchen.shardingspheredemo.controller;
    
    
    @RestController
    @RequestMapping("/api/v1/order")
    public class OrderController {
    
        @Autowired
        private OrderService orderService;
    
        @PostMapping("")
        public boolean save(@RequestBody OrderInfo orderInfo) {
            return orderService.save(orderInfo);
        }
    
        @DeleteMapping("/{orderId}")
        public boolean deleteById(
                @PathVariable("orderId")
                Long id) {
            return orderService.removeById(id);
        }
    
        @PutMapping("/{orderId}")
        public boolean updateById(
                @PathVariable("orderId")
                Long orderId,
                @RequestBody OrderInfo orderInfo) {
            orderInfo.setOrderId(orderId);
            return orderService.updateById(orderInfo);
        }
    
        @GetMapping("/list")
        public IPage page(
                @RequestParam(name = "pageNum", required = false, defaultValue = "1")
                        Integer pageNum,
                @RequestParam(name = "pageSize", required = false, defaultValue = "10")
                        Integer pageSize,
                @RequestParam(name = "orderId", required = false)
                Long orderId,
                @RequestParam(name = "orderStatus", required = false)
                Integer orderStatus,
                @RequestParam(name = "orderName", required = false)
                String orderName) {
            Page<OrderInfo> page = new Page<>(pageNum,pageSize);
            OrderInfo orderInfo = new OrderInfo();
            orderInfo.setOrderId(orderId);
            orderInfo.setOrderName(orderName);
            orderInfo.setOrderStatus(orderStatus);
            return orderService.pageOrderInfos(page, orderInfo);
        }
    }
    
    

    启动类

    package com.winterchen.shardingspheredemo;
    
    
    
    @SpringBootApplication
    public class ShardingsphereDemoApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ShardingsphereDemoApplication.class, args);
        }
    
    }
    
    

    以上就整合完毕了,可以使用postMan进行测试,测试截图就不展示了,后面会介绍关于读写分离的相关介绍,如果需要查看详细的介绍可以参考官方文档。

    相关资源

    相关文章

      网友评论

        本文标题:springboot 整合 Shardingsphere 4.0

        本文链接:https://www.haomeiwen.com/subject/gveuihtx.html