标签:cti system test mail 否则 value type ase style
sharding: jdbc: config: sharding: tables: myorder: key-generator-column-name: id #主键 actual-data-nodes: db$->{0..1}.myorder_$->{0..1} #分库策略 database‐strategy: standard: sharding-column: id #精确分库分片配置类 precise-algorithm-class-name: org.test.sharding.ShardingConfig #分表策略 table-strategy: standard: sharding-column: id #精确分表分片配置类 precise-algorithm-class-name: org.test.sharding.ShardingTableConfig orderitem: #test key-generator-column-name: id #主键 actual-data-nodes: db$->{0..1}.orderitem_$->{0..2} #数据节点,均匀分布 #分库策略 database‐strategy: inline: sharding-column: id algorithm-expression: db$->{id%2} table-strategy: inline: sharding-column: id algorithm-expression: orderitem_$->{id%2+1} #当两个分表的表进行关联查询的时候一定要将这两个表设置绑定表,否则会出现笛卡尔积 binding-tables[0]: orderitem,myorder props: sql: show: true datasource: names: db0,db1 db0: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/demo username: root password: 123456 db1: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/demo1 username: root password: 123456
精确分库策略配置类
/** * @author huQi * @email * @data 2021/1/20 13:04 */ import io.shardingsphere.api.algorithm.sharding.PreciseShardingValue; import io.shardingsphere.api.algorithm.sharding.standard.PreciseShardingAlgorithm; import org.springframework.stereotype.Component; import java.util.*; @Component public class ShardingConfig implements PreciseShardingAlgorithm<Long> { /** * 在开发的环境中一定不要用随机数来决定是在哪个库,会出现无法准确的定位库的情况 * @param collection 库名集合 * @param preciseShardingValue 分片列 * @return */ @Override public String doSharding(Collection<String> collection, PreciseShardingValue<Long> preciseShardingValue) { // 分片字段值 Long value = preciseShardingValue.getValue(); // 现在算法是:%2 求余如果是0则ds0.xmjbq_user,如果是1则ds0.xmjbq_user。但是由于id是字符串而且是很长的,所以截取最后一位然后转为Integer类型再求余 Random random = new Random(); int pick = random.nextInt(1); for (String s : collection) { if(s.contains(String.valueOf(pick))){ return s; } } throw new UnsupportedOperationException(); } }
精确分表配置类
import io.shardingsphere.api.algorithm.sharding.PreciseShardingValue; import io.shardingsphere.api.algorithm.sharding.standard.PreciseShardingAlgorithm; import org.springframework.stereotype.Component; import java.util.Collection; import java.util.Random; /** * @author huQi * @email * @data 2021/1/20 14:19 */ @Component public class ShardingTableConfig implements PreciseShardingAlgorithm<Long> { /** * 在开发的环境中一定不要用随机数来决定是在哪个表,会出现无法准确的定位表的情况 * * */ @Override public String doSharding(Collection<String> tables, PreciseShardingValue<Long> preciseShardingValue) { // 分片字段值 Long value = preciseShardingValue.getValue(); // 现在算法是:%2 求余如果是0则ds0.xmjbq_user,如果是1则ds0.xmjbq_user。但是由于id是字符串而且是很长的,所以截取最后一位然后转为Integer类型再求余 Random random = new Random(); int pick = 0; if(tables.size()>1){ pick = random.nextInt(3); } for (String s : tables) { System.out.println("sharding:"+s+"随机数"+pick); if(s.contains(String.valueOf(pick))){ return s; } } throw new UnsupportedOperationException(); } }
数据库
demo:myorder_0,myorder_1,orderitem_0,orderitem_1,orderitem_2
demo1:myorder_0,myorder_1,orderitem_0,orderitem_1,orderitem_2
标签:cti system test mail 否则 value type ase style
原文地址:https://www.cnblogs.com/huqi96/p/14426728.html