silencehgt 2020-07-19
1、搭建环境
(1)SpringBoot2.2.1+MyBatisPlus+Sharding-JDBC+Druid连接池
(2)创建SpringBoot工程,版本2.2.1
(3)引入相关依赖
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.20</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.apache.shardingsphere</groupId> <artifactId>sharding-jdbc-spring-boot-starter</artifactId> <version>4.0.0-RC1</version> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.0.5</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
2、按照水平分表的方式创建数据库,创建数据库表
(1)创建数据库 course_db
(2)在数据库中创建两张表 course_1 和 course_2
(3)约定一种规则:如果添加的课程id是偶数,把数据添加到course_1
如果是基数,则添加到course2
3、编写代码,完成对分库分表后数据的操作
(1)创建实体类,mapper
4、配置sharding-jdbc的分片策略
(1)在项目的配置文件中进行配置
#sharding-jdbc 分片策略 # 数据源名称,多数据源以逗号分隔 spring.shardingsphere.datasource.names=m1 #配置数据源的详细信息 # 数据库连接池 spring.shardingsphere.datasource.m1.type=com.alibaba.druid.pool.DruidDataSource #数据库驱动类名 spring.shardingsphere.datasource.m1.driver-class-name= com.mysql.cj.jdbc.Driver # 数据库 URL 连接 spring.shardingsphere.datasource.m1.url=jdbc:mysql://localhost:3306/course_db?serverTimezone=GMT%2B8 # 数据库用户名 spring.shardingsphere.datasource.m1.username= root # 数据库密码 spring.shardingsphere.datasource.m1.password=houchen # 指定course表的分布情况,配置在哪个数据库,表名称是什么 m1.course_1 m1.course_2 spring.shardingsphere.sharding.tables.course.actual-data-nodes=m1.course_$->{1..2} #指定course表中主键的生成策略 SNOWFLAKE:雪花算法,随机生成主键Id spring.shardingsphere.sharding.tables..course.key-generator.column= = cid spring.shardingsphere.sharding.tables..course.key-generator.type= =SNOWFLAKE # 指定分片的策略 约定cid值 : 偶数--》course_1 奇数-->course_2 spring.shardingsphere.sharding.tables.course.table-strategy.inline.sharding-column= cid spring.shardingsphere.sharding.tables.course.table-strategy.inline.algorithm-expression=course_$->{cid%2 +1} #打开sql的输出日志 spring.shardingsphere.props.sql.show = true
5、编写测试代码
@RunWith(SpringRunner.class) @SpringBootTest public class ShardingJdbcDdemoApplicationTest { @Autowired private CourseMapper courseMapper; @Test public void testInsert(){ Course course =new Course(); course.setCname("java"); course.setUserId(100L); course.setCstatus("normal"); courseMapper.insert(course); } }