springboot 基于 shardingsphere 分库分

pom文件

<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 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.wyl</groupId>
    <artifactId>shardingJDBC</artifactId>
    <packaging>jar</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>shardingJDBC Maven Webapp</name>
    <url>http://maven.apache.org</url>
    
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
        <relativePath/>
    </parent>
    
    <properties>
        <maven-jar-plugin.version>2.6</maven-jar-plugin.version>
    </properties>
    
    <dependencies>
        
        <!-- shardingSphere -->
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>4.0.1</version>
        </dependency>
        
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-namespace</artifactId>
            <version>4.0.1</version>
        </dependency>
        
        <!-- mysql数据库驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        
        <!-- 使用原生druid池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.16</version>
        </dependency>
        
        <!-- springBoot 启动类 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <!-- mybatis 配置 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.0</version>
        </dependency>
        
    </dependencies>
    
    <!-- spingcloud 依赖 -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <finalName>shardingJDBC</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.wyl.sharding.Application</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

properties 配置文件

server.port=8084

#指定mybatis信息
mybatis.mapperLocations: classpath:mapper/*.xml
mybatis.typeAliasesPackage: com.wyl.sharding.domain
mybatis.configuration.map-underscore-to-camel-case: true

#打印sql
spring.shardingsphere.props.sql.show=true

spring.shardingsphere.datasource.names=demo0,demo1

spring.shardingsphere.datasource.demo0.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.demo0.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.demo0.url=jdbc:mysql://127.0.0.1:3306/demo0?characterEncoding=utf-8
spring.shardingsphere.datasource.demo0.username=root
spring.shardingsphere.datasource.demo0.password=root

spring.shardingsphere.datasource.demo1.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.demo1.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.demo1.url=jdbc:mysql://127.0.0.1:3307/demo1?characterEncoding=utf-8
spring.shardingsphere.datasource.demo1.username=root
spring.shardingsphere.datasource.demo1.password=root

#根据id分库
spring.shardingsphere.sharding.default-database-strategy.inline.sharding-column=id
spring.shardingsphere.sharding.default-database-strategy.inline.algorithm-expression=demo$->{id % 2}

#根据user_id分表
spring.shardingsphere.sharding.tables.user.actual-data-nodes=demo$->{0..1}.user$->{0..3}
spring.shardingsphere.sharding.tables.user.table-strategy.inline.sharding-column=user_id
spring.shardingsphere.sharding.tables.user.table-strategy.inline.algorithm-expression=user$->{user_id % 4}

#根据unit_id分表
spring.shardingsphere.sharding.tables.unit.actual-data-nodes=demo$->{0..1}.unit$->{0..1}
spring.shardingsphere.sharding.tables.unit.table-strategy.inline.sharding-column=unit_id
spring.shardingsphere.sharding.tables.unit.table-strategy.inline.algorithm-expression=unit$->{unit_id % 2}

在2个数据库下分别创建表：

CREATE TABLE `unit0` (
  `id` int(11) NOT NULL,
  `unit_id` int(11) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `unit1` (
  `id` int(11) NOT NULL,
  `unit_id` int(11) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `user0` (
  `id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `name` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `user1` (
  `id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `name` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `user2` (
  `id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `name` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `user3` (
  `id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `name` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

其他的写法和未分库分表的写法相同