Sharding中怎么使用Sphere实现数据分库分表操作)
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引入依赖的jar
org.apache.shardingsphere sharding-jdbc-core ${sharding-sphere.version} org.apache.shardingsphere sharding-jdbc-spring-boot-starter ${sharding-sphere.version}
我这里用的是最新的版本
4.0.0-RC3-SNAPSHOT
库表脚本
当前测试例子是2库各10表,外加默认库的t_user表。结果如下:
创建数据库稍微注意一点,命名不能带下划线。 sharding0库脚本如下:
/* Navicat Premium Data Transfer Source Server : Source Server Type : MySQL Source Server Version : 50727 Source Host : Source Schema : sharding0 Target Server Type : MySQL Target Server Version : 50727 File Encoding : 65001 Date: 17/09/2019 10:43:09 */ SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for t_order0 -- ---------------------------- DROP TABLE IF EXISTS `t_order0`; CREATE TABLE `t_order0` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 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` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order2 -- ---------------------------- DROP TABLE IF EXISTS `t_order2`; CREATE TABLE `t_order2` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order3 -- ---------------------------- DROP TABLE IF EXISTS `t_order3`; CREATE TABLE `t_order3` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order4 -- ---------------------------- DROP TABLE IF EXISTS `t_order4`; CREATE TABLE `t_order4` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order5 -- ---------------------------- DROP TABLE IF EXISTS `t_order5`; CREATE TABLE `t_order5` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order6 -- ---------------------------- DROP TABLE IF EXISTS `t_order6`; CREATE TABLE `t_order6` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order7 -- ---------------------------- DROP TABLE IF EXISTS `t_order7`; CREATE TABLE `t_order7` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order8 -- ---------------------------- DROP TABLE IF EXISTS `t_order8`; CREATE TABLE `t_order8` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order9 -- ---------------------------- DROP TABLE IF EXISTS `t_order9`; CREATE TABLE `t_order9` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_user -- ---------------------------- DROP TABLE IF EXISTS `t_user`; CREATE TABLE `t_user` ( `user_id` bigint(20) NOT NULL AUTO_INCREMENT, `name` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `age` int(11) NULL DEFAULT NULL, `sex` int(4) NULL DEFAULT NULL, `phone` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`user_id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; SET FOREIGN_KEY_CHECKS = 1;
sharding1数据库脚本如下:
/* Navicat Premium Data Transfer Source Server : 139.196.229.195 Source Server Type : MySQL Source Server Version : 50727 Source Host : 139.196.229.195:3306 Source Schema : sharding1 Target Server Type : MySQL Target Server Version : 50727 File Encoding : 65001 Date: 17/09/2019 10:43:20 */ SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for t_order0 -- ---------------------------- DROP TABLE IF EXISTS `t_order0`; CREATE TABLE `t_order0` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 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` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order2 -- ---------------------------- DROP TABLE IF EXISTS `t_order2`; CREATE TABLE `t_order2` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order3 -- ---------------------------- DROP TABLE IF EXISTS `t_order3`; CREATE TABLE `t_order3` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order4 -- ---------------------------- DROP TABLE IF EXISTS `t_order4`; CREATE TABLE `t_order4` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order5 -- ---------------------------- DROP TABLE IF EXISTS `t_order5`; CREATE TABLE `t_order5` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order6 -- ---------------------------- DROP TABLE IF EXISTS `t_order6`; CREATE TABLE `t_order6` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order7 -- ---------------------------- DROP TABLE IF EXISTS `t_order7`; CREATE TABLE `t_order7` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order8 -- ---------------------------- DROP TABLE IF EXISTS `t_order8`; CREATE TABLE `t_order8` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Table structure for t_order9 -- ---------------------------- DROP TABLE IF EXISTS `t_order9`; CREATE TABLE `t_order9` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(32) NULL DEFAULT NULL, `order_id` bigint(32) NULL DEFAULT NULL, `title` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `content` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL, `create_time` datetime(0) NULL DEFAULT NULL, `update_time` datetime(0) NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; SET FOREIGN_KEY_CHECKS = 1;
默认分库分表策略
Springboot配置
#数据源名称,多数据源以逗号分隔 spring.shardingsphere.datasource.names=sharding0,sharding1 #sharding0是数据源名 spring.shardingsphere.datasource.sharding0.type=com.alibaba.druid.pool.DruidDataSource spring.shardingsphere.datasource.sharding0.driver-class-name=com.mysql.cj.jdbc.Driver spring.shardingsphere.datasource.sharding0.url=jdbc:mysql://***:3306/sharding0?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&serverTimezone=Asia/Shanghai&zeroDateTimeBehavior=CONVERT_TO_NULL spring.shardingsphere.datasource.sharding0.username=root spring.shardingsphere.datasource.sharding0.password=*** # spring.shardingsphere.datasource..xxx= #数据库连接池的其它属性 # sharding1 是数据源名称 spring.shardingsphere.datasource.sharding1.type=com.alibaba.druid.pool.DruidDataSource spring.shardingsphere.datasource.sharding1.driver-class-name=com.mysql.cj.jdbc.Driver spring.shardingsphere.datasource.sharding1.url=jdbc:mysql://***:3306/sharding1?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&serverTimezone=Asia/Shanghai&zeroDateTimeBehavior=CONVERT_TO_NULL spring.shardingsphere.datasource.sharding1.username=root spring.shardingsphere.datasource.sharding1.password=*** # 默认数据源,没有分片的走这个数据源 spring.shardingsphere.sharding.default-data-source-name=sharding0 spring.shardingsphere.sharding.default-database-strategy.inline.sharding-column=user_id spring.shardingsphere.sharding.default-database-strategy.inline.algorithm-expression=sharding$->{user_id % 2} # t_order是表明 spring.shardingsphere.sharding.tables.t_order.actual-data-nodes=sharding$->{0..1}.t_order$->{0..9} spring.shardingsphere.sharding.tables.t_order.table-strategy.inline.sharding-column=order_id spring.shardingsphere.sharding.tables.t_order.table-strategy.inline.algorithm-expression=t_order$->{order_id % 10} # 分布式主键 内置的支持这三种 SNOWFLAKE/UUID/LEAF_SEGMENT spring.shardingsphere.sharding.tables.t_order.key-generator.column=id spring.shardingsphere.sharding.tables.t_order.key-generator.type=SNOWFLAKE
读写操作
因为上面是根据 user_id、order_id 两个字段分库分表的,所以必须插入查询都得带上user_id、order_id两个字段。
单表插入(支持)
@Test public void testSharding(){ Order order = new Order(); order.setUserId(1l); order.setOrderId(1l); order.setTitle("测试,userId:"+order.getUserId() + " orderId:" + order.getOrderId()); order.setContent(order.getTitle()); Assert.assertEquals(1,orderMapper.insert(order)); }
查看数据库,确实插入了
单表查询(支持)
@Test public void testShardingRead(){ OrderExample ex = new OrderExample(); ex.createCriteria().andUserIdEqualTo(1l).andOrderIdEqualTo(1l); Listorders = orderMapper.selectByExample(ex); Assert.assertNotNull(orders); Assert.assertEquals(1, orders.size()); orders.stream().forEach(o->{ System.out.println("userId:"+o.getUserId() + " orderId:" + o.getOrderId()); }); }
默认库表插入(支持)
@Test public void testUserWrite(){ User user = new User(); user.setAge(10); user.setName("张三"); user.setPhone("15157181986"); user.setSex(1); user.setUpdateTime(new Date()); user.setCreateTime(new Date()); userMapper.insert(user); System.out.println("userId:"+user.getUserId()); }
单表聚合查询
count(支持)
@Test public void testShardingReadCount(){ OrderExample ex = new OrderExample(); long count = orderMapper.countByExample(ex); System.out.println("count:"+count); }
order by,limit(支持)
@Test public void testShardingReadLimit(){ OrderExample ex = new OrderExample(); ex.setLimit(2); ex.setOffset(2l); ex.setOrderByClause(" user_id desc "); Listorders = orderMapper.selectByExample(ex); orders.stream().forEach(o->{ System.out.println("userId:"+o.getUserId() + " orderId:" + o.getOrderId()); }); }
group by(支持)
@Getter @Setter public class GroupResult implements Serializable { private Long userId; private Integer cnt; }@Test public void testShardingReadGroupBy(){ List userOrderCounts = orderMapper.getUserOrderCount(); userOrderCounts.forEach(u->System.out.println("userId:"+u.getUserId() + " count:" + u.getCnt())); }
单表与分表关联查询(仅支持广播表跟分表的关联查询)
单表:不做分库分表的逻辑表 (如本示例中的t_user) 分表:做分库分表的逻辑表(如本示例中的 t_order) 广播表:指所有的分片数据源中都存在的表,表结构和表中的数据在每个数据库中均完全一致。适用于数据量不大且需要与海量数据的表进行关联查询的场景,例如:字典表。(这个概念参考:广播表)
这里 单表 跟 分表关联查询,必须每一个库中有一份单表(也就是广播表),否则不能关联查询。如下面的语句,本示例中是不能执行的。因为本示例 t_order 逻辑表分散在两个库中,t_user表必须要在两个库中都有一份才能关联查询。
以上就是Sharding中怎么使用Sphere实现数据分库分表操作),小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
分享题目:Sharding中怎么使用Sphere实现数据分库分表操作)
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