SpringBoot integrated Sharding-jdbc achieve sub-library sub-table

A, Sharding-jdbc Introduction

1 Introduction

Sharding-jdbc is a client of the agency Dangdang CAPE source middleware. Sharding-jdbc fragmentation and sub-libraries comprising separate read and write functions. No application code invasive, almost no changes, orm framework compatible with the mainstream, the mainstream database connection pool. Currently part of the Apache incubator project ShardingSphere. 

Sharding-jdbc positioned as a lightweight Java framework, additional services provided by Java's JDBC layer. It uses direct client database, provide services in the form of jar package, without additional deployment and dependence, understood as enhanced version of the JDBC driver, JDBC and is fully compatible with all kinds of ORM frameworks.
ORM framework for any JDBC-based, such as: JPA, Hibernate, Mybatis, Spring JDBC Template directly or JDBC.
Support any third-party database connection pool, such as: DBCP, C3P0, BoneCP, Druid , HikariCP and so on.
Support any implementation database JDBC specification. Currently supports MySQL, Oracle, SQLServer, PostgreSQL database as well as any follow SQL92 standard.

2, solution architecture

Two, Sharding-jdbc sub-library sub-table

1. Create two databases land1, land2, each containing t_user0, t_user1 two tables

DROP TABLE IF EXISTS `t_user0`;
CREATE TABLE `t_user0`  (
  `id` bigint(20) NOT NULL,
  `name` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '名称',
  city_id` ` int ( 12 ) NULL  the DEFAULT  NULL the COMMENT ' city ' ,
  sex` ` tinyint ( . 1 ) NULL  the DEFAULT  NULL the COMMENT ' Sex ' ,
  `phone` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '电话',
  `email` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '邮箱',
  `create_time` timestamp(0) NOT NULL DEFAULT CURRENT_TIMESTAMP(0) ON UPDATE CURRENT_TIMESTAMP(0) COMMENT '创建时间',
  `password` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '密码',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8;

DROP TABLE IF EXISTS `t_user0`;
CREATE TABLE `t_user0`  (
  `id` bigint(20) NOT NULL,
  `name` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '名称',
  city_id` ` int ( 12 ) NULL  the DEFAULT  NULL the COMMENT ' city ' ,
  sex` ` tinyint ( . 1 ) NULL  the DEFAULT  NULL the COMMENT ' Sex ' ,
  `phone` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '电话',
  `email` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '邮箱',
  `create_time` timestamp(0) NOT NULL DEFAULT CURRENT_TIMESTAMP(0) ON UPDATE CURRENT_TIMESTAMP(0) COMMENT '创建时间',
  `password` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '密码',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8;

2, Springboot add Maven project dependent, Mybatisplus, Druid, Sharding-jdbc-dependent

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.1.2</version>
</dependency>

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.6</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.48</version>
</dependency>

<!-- sharding-sphere -->
<dependency>
    <groupId>io.shardingsphere</groupId>
    <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
    <version>3.1.0</version>
</dependency>

<dependency>
    <groupId>io.shardingsphere</groupId>
    <artifactId>sharding-jdbc-spring-namespace</artifactId>
    <version>3.1.0</version>
</dependency>

3, was added sharding-jdbc sub-sub-table in the database configuration application.xml

server:
  port: 8800

spring:
  application:
    name: service-hi
  main:
    allow-bean-definition-overriding: true # allowed to cover registration

eureka:
  instance:
    prefer-ip-address: true # turn on the display IP address
    instance-id: $ {spring.cloud.client.ip-address}: $ {server.port} #eureka page displays the IP address: port number
  client:
    ServiceUrl:
      defaultZone: http://localhost:8761/eureka/

sharding:
  jdbc:
    datasource:
      names: ds0,ds1
      ds0:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/land1?characterEncoding=utf-8&useUnicode=true&useSSL=true
        username: root
        password: root
      ds1:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/land2?characterEncoding=utf-8&useUnicode=true&useSSL=true
        username: root
        password: root
    config:
      sharding:
        default-data-source-name: ds0 # fragmentation is not configured by default rule table data source localization
        default-database-strategy: # default database partitioning strategy, the same strategy sub-libraries
          inline:
            sharding-column: city_id
            algorithm-expression: ds${city_id % 2}
        default-table-strategy: # default table partitioning strategy, with the sub-table strategy
          inline:
            shardingColumn: sex
            algorithm-expression: t_user${sex % 2}
        props:
          sql.show: true # sql statement is displayed
        tables:
          t_user:  #t_user表
            key-generator-column-name: id  #主键
            actual-data-nodes: ds $ {0..1} .t_user $ {0..1} # data node
            database-strategy: # points Library Strategy
              inline:
                sharding-column: city_id
                algorithm-expression: ds${city_id % 2}
            table-strategy: # sub-table strategy
              inline:
                shardingColumn: sex
                algorithm-expression: t_user${sex % 2}

mybatis-plus:
    type-aliases-package: com.landcode.service.hi.model
    mapper-locations: classpath:mapper/*.xml

4, note that in mapper.xml sql configuration file, use the table name user, rather than user0, user1. sharding-jdbc sql performs automatic configuration according to the rules in the corresponding table

  <select id="selectUserList" resultType="com.landcode.service.hi.model.User">
    select
    <include refid="Base_Column_List" />
    from t_user
  </select>