CREATE TABLE `course_1` (
`cid` bigint(20) NOT NULL,
`cname` varchar(50) NOT NULL,
`user_id` bigint(20) NOT NULL,
`cstatus` varchar(10) NOT NULL,
PRIMARY KEY (`cid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `course_2` (
`cid` bigint(20) NOT NULL,
`cname` varchar(50) NOT NULL,
`user_id` bigint(20) NOT NULL,
`cstatus` varchar(10) NOT NULL,
PRIMARY KEY (`cid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
# shardingjdbc 分片策略
# 配置数据源,给数据源起名称,
# 水平分库,配置两个数据源
spring.shardingsphere.datasource.names=m1,m2
# 一个实体类对应两张表,覆盖
spring.main.allow-bean-definition-overriding=true
# 配置第一个数据源具体内容,包含连接池,驱动,地址,用户名和密码
spring.shardingsphere.datasource.m1.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.m1.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.m1.url=jdbc:mysql://localhost:3306/edu_db_1?serverTimezone=GMT%2B8
spring.shardingsphere.datasource.m1.username=root
spring.shardingsphere.datasource.m1.password=Mima123456
# 配置第二个数据源具体内容,包含连接池,驱动,地址,用户名和密码
spring.shardingsphere.datasource.m2.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.m2.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.m2.url=jdbc:mysql://localhost:3306/edu_db_2?serverTimezone=GMT%2B8
spring.shardingsphere.datasource.m2.username=root
spring.shardingsphere.datasource.m2.password=Mima123456
# 指定数据库分布情况,数据库里面表分布情况
# 数据库:m1 m2 数据表:course_1 course_2
spring.shardingsphere.sharding.tables.course.actual-data-nodes=m$->{1..2}.course_$->{1..2}
# 指定 course 表里面主键 cid 生成策略 SNOWFLAKE
spring.shardingsphere.sharding.tables.course.key-generator.column=cid
spring.shardingsphere.sharding.tables.course.key-generator.type=SNOWFLAKE
# 指定表分片策略:约定 cid 值偶数添加到 course_1 表,如果 cid 是奇数添加到 course_2 表
spring.shardingsphere.sharding.tables.course.table-strategy.inline.sharding-column=cid
spring.shardingsphere.sharding.tables.course.table-strategy.inline.algorithm-expression=course_$->{cid % 2 + 1}
# 指定数据库分片策略:约定 user_id 是偶数添加 m1,是奇数添加 m2
spring.shardingsphere.sharding.tables.course.database-strategy.inline..sharding-column=user_id
spring.shardingsphere.sharding.tables.course.database-strategy.inline.algorithm-expression=m$->{user_id % 2 + 1}
# 打开sql输出日志
spring.shardingsphere.props.sql.show=true
//======================测试水平分库=====================
// 添加操作
@Test
public void addCourseDb() {
for (int i = 1; i <= 20; i++) {
Course course = new Course();
course.setCname("java" + i);
course.setUserId((long) (new Random().nextInt(11)));
course.setCstatus("Normal" + i);
courseMapper.insert(course);
}
}
// 查询操作
@Test
public void findCourseDb() {
QueryWrapper<Course> wrapper = new QueryWrapper<>();
// 设置 userid 值
wrapper.eq("user_id", 9L);
// 设置 cid 值
wrapper.eq("cid", 663778213209571329L);
Course course = courseMapper.selectOne(wrapper);
System.out.println(course);
}
Course(cid=663778213209571329, cname=java15, userId=9, cstatus=Normal15)
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