sharding-jdbc5.0.0实现分表实践

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
       <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-jdbc-core-spring-boot-starter</artifactId>
            <version>5.0.0</version>
        </dependency>
      <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

spring:
  shardingsphere:
    datasource:  ##数据源配置
      ds0:
        driver-class-name: com.mysql.jc.jdbc.Driver
        jdbc-url: jdbc:mysql://...
        password: ...
        type: com.zaxxer.hikari.HikariDataSource
        username: root
      names: ds0
    mode:
      type: Memory
    props:
      sql-show: false ##为true时会打印sharding-jdbc生成的逻辑sql跟实际执行语句
    rules: ##分片规则配置
      sharding:
        binding-tables:
        - trade_info
        sharding-algorithms:
          trade-info-inline:  #分片算法配置
            props:
              sharding-count: '12'
            type: HASH_MOD
        tables:
          trade_info:
            actual-data-nodes: ds0.trade_info_$->{0..11}
            table-strategy:
              standard:
                sharding-algorithm-name: trade-info-inline  ##使用的分片算法名
                sharding-column: trade_no  ##分片键

public class SnowFlakeIdGenerator implements IdentifierGenerator {

    @Override
    public Serializable generate(SharedSessionContractImplementor sharedSessionContractImplementor, Object o) throws HibernateException {
        return SnowFlakeUtil.nextId();
    }

    @Override
    public boolean supportsJdbcBatchInserts() {
        return true;
    }
}

    @Id
    @GenericGenerator(name = "snowflake",strategy = "com.****.****.****.SnowFlakeIdGenerator")
    @GeneratedValue(generator = "snowflake")
    private Long id;

    public void preValidate(ShardingRule shardingRule, SQLStatementContext<UpdateStatement> sqlStatementContext, List<Object> parameters, ShardingSphereSchema schema) {
        this.validateMultipleTable(shardingRule, sqlStatementContext);
        UpdateStatement sqlStatement = (UpdateStatement)sqlStatementContext.getSqlStatement();
        String tableName = (String)sqlStatementContext.getTablesContext().getTableNames().iterator().next();
        Iterator var7 = sqlStatement.getSetAssignment().getAssignments().iterator();

        String shardingColumn;
        Optional shardingColumnSetAssignmentValue;
        Optional shardingValue;
        do {
            AssignmentSegment each;
            do {
                if (!var7.hasNext()) {
                    return;
                }

                each = (AssignmentSegment)var7.next();
                shardingColumn = ((ColumnSegment)each.getColumns().get(0)).getIdentifier().getValue();
            } while(!shardingRule.isShardingColumn(shardingColumn, tableName));

            shardingColumnSetAssignmentValue = this.getShardingColumnSetAssignmentValue(each, parameters);
            shardingValue = Optional.empty();
            Optional<WhereSegment> whereSegmentOptional = sqlStatement.getWhere();
            if (whereSegmentOptional.isPresent()) {
                shardingValue = this.getShardingValue((WhereSegment)whereSegmentOptional.get(), parameters, shardingColumn);
            }
        } while(shardingColumnSetAssignmentValue.isPresent() && shardingValue.isPresent() && shardingColumnSetAssignmentValue.get().equals(shardingValue.get()));

        throw new ShardingSphereException("Can not update sharding key, logic table: [%s], column: [%s].", new Object[]{tableName, shardingColumn});
    }