作者：聚变归来
https://www.cnblogs.com/victor2302/p/6073821.html
订单的表结构采用了垂直分表的策略,将订单相关的不同模块的字段维护在不同表中
在订单处理这个页面,需要查询各种维度,
因此为了方便查询创建了v_sale_order视图(老版本)
drop view v_sale_order;CREATEVIEW `v_sale_order` ASSELECT `so`.`sale_order_id` AS `v_sale_order_id`, `so`.`sale_order_id` AS `sale_order_id`, `so`.`sale_order_no` AS `sale_order_no`, `so`.`order_type` AS `order_type`, `so`.`platform_order_code2` AS `platform_order_code2`, `so`.`platform_order_code` AS `platform_order_code`, `so`.`platform_type` AS `platform_type`, `so`.`platform_order_status` AS `platform_order_status`, `so`.`created` AS `created`, `so`.`end_time` AS `end_time`, `so`.`total_num` AS `total_num`, `so`.`total_sku` AS `total_sku`, `so`.`modified` AS `modified`, `so`.`seller_flag` AS `seller_flag`, `so`.`seller_memo` AS `seller_memo`, `so`.`seller_rate` AS `seller_rate`, `so`.`snapshot_url` AS `snapshot_url`, `so`.`status` AS `status`, `so`.`step_trade_status` AS `step_trade_status`, `so`.`trade_from` AS `trade_from`, `so`.`trade_memo` AS `trade_memo`, `so`.`trade_source` AS `trade_source`, `so`.`type` AS `type`, `so`.`shop_id` AS `shop_id`, `so`.`origin_type` AS `origin_type`, `so`.`sys_promotion_info` AS `sys_promotion_info`, `sor`.`buyer_area` AS `buyer_area`, `sor`.`buyer_email` AS `buyer_email`, `sor`.`buyer_ip` AS `buyer_ip`, `sor`.`buyer_memo` AS `buyer_memo`, `sor`.`buyer_message` AS `buyer_message`, `sor`.`buyer_nick` AS `buyer_nick`, `sor`.`buyer_rate` AS `buyer_rate`, `sor`.`receiver_address` AS `receiver_address`, `sor`.`receiver_city` AS `receiver_city`, `sor`.`receiver_country` AS `receiver_country`, `sor`.`receiver_district` AS `receiver_district`, `sor`.`receiver_mobile` AS `receiver_mobile`, `sor`.`receiver_name` AS `receiver_name`, `sor`.`receiver_phone` AS `receiver_phone`, `sor`.`receiver_state` AS `receiver_state`, `sor`.`receiver_town` AS `receiver_town`, `sor`.`receiver_zip` AS `receiver_zip`, `sor`.`area_id` AS `area_id`, `sor`.`customer_id` AS `customer_id`, `soc`.`courier_id` AS `courier_id`, `soc`.`courier_order_no` AS `courier_order_no`, `soc`.`courier_print_mark_state` AS `courier_print_mark_state`, `soc`.`courier_print_time` AS `courier_print_time`, `sof`.`alipay_id` AS `alipay_id`, `sof`.`alipay_no` AS `alipay_no`, `sof`.`payment` AS `payment`, `sof`.`total_fee` AS `total_fee`, `soi`.`invoice_order_no` AS `invoice_order_no`, `soi`.`invoice_content` AS `invoice_content`, `soi`.`invoice_type` AS `invoice_type`, `soi`.`bank` AS `bank`, `soi`.`title` AS `title`, `soi`.`bank_account` AS `bank_account`, `soi`.`tariff_lines` AS `tariff_lines`, `sos`.`oms_process_type` AS `oms_process_type`, `sos`.`play_state` AS `play_state`, `sos`.`pause_state` AS `pause_state`, `sos`.`stop_state` AS `stop_state`, `sos`.`archive_state` AS `archive_state`, `sos`.`is_paid` AS `is_paid`, `sos`.`is_checked` AS `is_checked`, `sos`.`is_approved` AS `is_approved`, `sos`.`is_suspended` AS `is_suspended`, `sos`.`is_invalidated` AS `is_invalidated`, `sos`.`is_to_be_shipped` AS `is_to_be_shipped`, `sos`.`is_after_sale` AS `is_after_sale`, `sos`.`is_split` AS `is_split`, `sos`.`is_combined` AS `is_combined`, `sos`.`is_closed` AS `is_closed`, `sos`.`is_after_sale_closed` AS `is_after_sale_closed`, `sos`.`is_amount_changed` AS `is_amount_changed`, `sos`.`is_part_changed` AS `is_part_changed`, `sos`.`is_out_of_stock` AS `is_out_of_stock`, `sos`.`pay_type` AS `pay_type`, `sos`.`pay_time` AS `pay_time`, `sos`.`original_order_id` AS `original_order_id`, `sos`.`after_sale_note` AS `after_sale_note`, `sos`.`suspend_note` AS `suspend_note`, `sos`.`unapprove_note` AS `unapprove_note`, `sos`.`after_sale_type` AS `after_sale_type`, `sos`.`blacklist_type` AS `blacklist_type`, `sow`.`warehouse_id` AS `warehouse_id`, `sow`.`retry_num` AS `retry_num`, `sow`.`out_warehouse_time` AS `out_warehouse_time`, `sow`.`purchase_order_no` AS `purchase_order_no`, `sow`.`purchase_order_id` AS `purchase_order_id`, `sow`.`wms_order_state` AS `wms_order_state`, `sow`.`checked_time` AS `checked_time`, `so`.`creator` AS `creator`, `so`.`create_time` AS `create_time`, `so`.`last_updater` AS `last_updater`, `so`.`last_update_time` AS `last_update_time`, `so`.`is_usable` AS `is_usable`, `so`.`tenant_id` AS `tenant_id`FROM ( ( ( ( ( ( `sale_order` `so` LEFT JOIN `sale_order_receiver` `sor` ON ( ( `so`.`sale_order_id` = `sor`.`sale_order_id` ) ) ) LEFT JOIN `sale_order_status` `sos` ON ( ( `so`.`sale_order_id` = `sos`.`sale_order_id` ) ) ) LEFT JOIN `sale_order_warehouse` `sow` ON ( ( `so`.`sale_order_id` = `sow`.`sale_order_id` ) ) ) LEFT JOIN `sale_order_courier` `soc` ON ( ( `so`.`sale_order_id` = `soc`.`sale_order_id` ) ) ) LEFT JOIN `sale_order_invoice` `soi` ON ( ( `so`.`sale_order_id` = `soi`.`sale_order_id` ) ) ) LEFT JOIN `sale_order_finance` `sof` ON ( ( `so`.`sale_order_id` = `sof`.`sale_order_id` ) ) );
之前的代码(老版本):
@Service
public class OrderService extends TemplateService { public static final String DEFALUT_FILTER = " AND NOT(is_split = 1 AND archive_state=3) AND NOT(is_combined = 1 AND archive_state=4) " + " AND NOT(oms_process_type =0) AND (v_sale_order.platform_order_status != 'TRADE_FINISHED' OR origin_type=2) " + "AND NOT is_invalidated=1" + " AND NOT archive_state=5 AND NOT archive_state=6";
public static final String HISTORY_FILTER = " AND NOT(is_split = 1 AND archive_state=3) AND NOT(is_combined = 1 AND archive_state=4) " +
" AND NOT archive_state=5 AND NOT archive_state=6";}
DEFAULT_FILTER是订单处理里面,固定的查询条件,每次查询都会有该部分条件,但是sql的写法包含了太多OR,NOT,!= 等操作
优化第一步: 根据业务规则合并一些字段,将一些排除条件改为正向命中的条件(第二版):
@Service
public class OrderService extends TemplateService { /** 订单处理: 过滤掉:合并拆分的订单 过滤掉:交易完成或交易关闭 要求:跑过预处理 要求:已付款或者货到付款 要求:未作废的 */ public static final String DEFALUT_FILTER = " AND archive_state IN (0, 1) AND v_sale_order.is_paid = 1 AND oms_process_type = 1 " + " AND v_sale_order.is_invalidated=0 AND is_closed = 0"; /** * 订单查询: * 过滤掉:合并拆分的订单 */ public static final String HISTORY_FILTER = " AND archive_state IN (0, 1)"; public static final String AFTER_FILTER = " AND archive_state IN (0,1,2) AND is_paid=1"; }
优化第二步: 订单处理相比订单查询多了很多固定条件,大部分处于sale_order_status表中,但是之前视图的创建方式固定了最左边的表,因此修改视图创建的脚本,如下:
从固定的left join改为 Join
CREATE OR REPLACE VIEW v_sale_order AS SELECT `so`.`sale_order_id` AS `v_sale_order_id`, `so`.`sale_order_id` AS `sale_order_id`, `so`.`sale_order_no` AS `sale_order_no`, `so`.`order_type` AS `order_type`, `so`.`platform_order_code2` AS `platform_order_code2`, `so`.`platform_order_code` AS `platform_order_code`, `so`.`platform_type` AS `platform_type`, `so`.`platform_order_status` AS `platform_order_status`, `so`.`created` AS `created`, `so`.`end_time` AS `end_time`, `so`.`total_num` AS `total_num`, `so`.`total_sku` AS `total_sku`, `so`.`modified` AS `modified`, `so`.`seller_flag` AS `seller_flag`, `so`.`seller_memo` AS `seller_memo`, `so`.`seller_rate` AS `seller_rate`, `so`.`snapshot_url` AS `snapshot_url`, `so`.`status` AS `status`, `so`.`step_trade_status` AS `step_trade_status`, `so`.`trade_from` AS `trade_from`, `so`.`trade_memo` AS `trade_memo`, `so`.`trade_source` AS `trade_source`, `so`.`type` AS `type`, `so`.`shop_id` AS `shop_id`, `so`.`origin_type` AS `origin_type`, `so`.`sys_promotion_info` AS `sys_promotion_info`, `sor`.`buyer_area` AS `buyer_area`, `sor`.`buyer_email` AS `buyer_email`, `sor`.`buyer_ip` AS `buyer_ip`, `sor`.`buyer_memo` AS `buyer_memo`, `sor`.`buyer_message` AS `buyer_message`, `sor`.`buyer_nick` AS `buyer_nick`, `sor`.`buyer_rate` AS `buyer_rate`, `sor`.`receiver_address` AS `receiver_address`, `sor`.`receiver_city` AS `receiver_city`, `sor`.`receiver_country` AS `receiver_country`, `sor`.`receiver_district` AS `receiver_district`, `sor`.`receiver_mobile` AS `receiver_mobile`, `sor`.`receiver_name` AS `receiver_name`, `sor`.`receiver_phone` AS `receiver_phone`, `sor`.`receiver_state` AS `receiver_state`, `sor`.`receiver_town` AS `receiver_town`, `sor`.`receiver_zip` AS `receiver_zip`, `sor`.`area_id` AS `area_id`, `sor`.`customer_id` AS `customer_id`, `soc`.`courier_id` AS `courier_id`, `soc`.`courier_order_no` AS `courier_order_no`, `soc`.`courier_print_mark_state` AS `courier_print_mark_state`, `soc`.`courier_print_time` AS `courier_print_time`, `sof`.`alipay_id` AS `alipay_id`, `sof`.`alipay_no` AS `alipay_no`, `sof`.`payment` AS `payment`, `sof`.`total_fee` AS `total_fee`, `soi`.`invoice_order_no` AS `invoice_order_no`, `soi`.`invoice_content` AS `invoice_content`, `soi`.`invoice_type` AS `invoice_type`, `soi`.`bank` AS `bank`, `soi`.`title` AS `title`, `soi`.`bank_account` AS `bank_account`, `soi`.`tariff_lines` AS `tariff_lines`, `sos`.`oms_process_type` AS `oms_process_type`, `sos`.`play_state` AS `play_state`, `sos`.`pause_state` AS `pause_state`, `sos`.`stop_state` AS `stop_state`, `sos`.`archive_state` AS `archive_state`, `sos`.`is_paid` AS `is_paid`, `sos`.`is_checked` AS `is_checked`, `sos`.`is_approved` AS `is_approved`, `sos`.`is_suspended` AS `is_suspended`, `sos`.`is_invalidated` AS `is_invalidated`, `sos`.`is_to_be_shipped` AS `is_to_be_shipped`, `sos`.`is_after_sale` AS `is_after_sale`, `sos`.`is_split` AS `is_split`, `sos`.`is_combined` AS `is_combined`, `sos`.`is_closed` AS `is_closed`, `sos`.`is_after_sale_closed` AS `is_after_sale_closed`, `sos`.`is_amount_changed` AS `is_amount_changed`, `sos`.`is_part_changed` AS `is_part_changed`, `sos`.`is_out_of_stock` AS `is_out_of_stock`, `sos`.`pay_type` AS `pay_type`, `sos`.`pay_time` AS `pay_time`, `sos`.`original_order_id` AS `original_order_id`, `sos`.`after_sale_note` AS `after_sale_note`, `sos`.`suspend_note` AS `suspend_note`, `sos`.`unapprove_note` AS `unapprove_note`, `sos`.`after_sale_type` AS `after_sale_type`, `sos`.`blacklist_type` AS `blacklist_type`, `sow`.`warehouse_id` AS `warehouse_id`, `sow`.`retry_num` AS `retry_num`, `sow`.`out_warehouse_time` AS `out_warehouse_time`, `sow`.`purchase_order_no` AS `purchase_order_no`, `sow`.`purchase_order_id` AS `purchase_order_id`, `sow`.`wms_order_state` AS `wms_order_state`, `sow`.`checked_time` AS `checked_time`, `so`.`creator` AS `creator`, `sos`.`create_time` AS `create_time`, `so`.`last_updater` AS `last_updater`, `sos`.`last_update_time` AS `last_update_time`, `sos`.`is_usable` AS `is_usable`, `sos`.`tenant_id` AS `tenant_id` FROM ((((((`sale_order_status` `sos` JOIN `sale_order_receiver` `sor` ON ((`sos`.`sale_order_id` = `sor`.`sale_order_id`))) JOIN `sale_order` `so` ON ((`so`.`sale_order_id` = `sos`.`sale_order_id`))) JOIN `sale_order_warehouse` `sow` ON ((`sos`.`sale_order_id` = `sow`.`sale_order_id`))) JOIN `sale_order_courier` `soc` ON ((`sos`.`sale_order_id` = `soc`.`sale_order_id`))) JOIN `sale_order_finance` `sof` ON ((`sos`.`sale_order_id` = `sof`.`sale_order_id`))) LEFT JOIN `sale_order_invoice` `soi` ON ((`sos`.`sale_order_id` = `soi`.`sale_order_id`)))
最左边表可根据查询条件动态的变化,(如条件过滤查询sale_order_courier的courier_id字段, where courier_id= xx,并且sale_order_courier的courier_id字段上已经建立了索引,那么explain后第一个查询的表就是sale_order_courier)
之前sale_order表始终作为v_sale_order实际查询时的第一个表,而无法走索引
(P.S.本人目前的理解:mysql多表关联查询只有最左边表可以走索引,其余表的索引只能是关联的id作为索引)
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
|---|---|---|---|---|---|---|---|---|---|
| 1 | SIMPLE | sos | ref | idx_sale_order_id,oms_normal_v2,oms_check_v2,oms_suspend_v2 | oms_check_v2 | 10 | const,const,const,const | 271 | Using where; Using filesort |
| 1 | SIMPLE | sor | ref | idx_sale_order_id | idx_sale_order_id | 9 | egenie.sos.sale_order_id | 1 | NULL |
| 1 | SIMPLE | soc | ref | idx_sale_order_id | idx_sale_order_id | 9 | egenie.sos.sale_order_id | 1 | NULL |
| 1 | SIMPLE | sof | ref | idx_sale_order_id | idx_sale_order_id | 9 | egenie.sos.sale_order_id | 1 | NULL |
| 1 | SIMPLE | so | eq_ref | PRIMARY | PRIMARY | 8 | egenie.sos.sale_order_id | 1 | NULL |
| 1 | SIMPLE | sow | ref | idx_sale_order_id | idx_sale_order_id | 9 | egenie.sos.sale_order_id | 1 | NULL |
| 1 | SIMPLE | soi | ref | idx_sale_order_id | idx_sale_order_id | 9 | egenie.sos.sale_order_id | 1 | NULL |
随后创建的索引(第一版),生效
--archive_state in()结果太多 走不了索引
CREATE INDEX oms_normal on sale_order_status(tenant_id,is_usable,is_paid,oms_process_type,is_invalidated,is_closed,last_update_time);CREATE INDEX oms_check on sale_order_status(tenant_id,is_usable,is_paid,oms_process_type,is_invalidated,is_closed, is_checked,last_update_time);CREATE INDEX oms_suspend on sale_order_status(tenant_id,is_usable,is_paid,oms_process_type,is_invalidated,is_closed, is_suspended,last_update_time);
--sale_order
CREATE INDEX shop_idx on sale_order(shop_id,order_type);CREATE INDEX platform_idx on sale_order(platform_order_status,order_type);
--sale_order_warehouse
CREATE INDEX warehouse_idx on sale_order_warehouse(warehouse_id);
--sale_order_courierCREATE INDEX courier_idx on sale_order_courier(courier_id);
由于有新需求需要改造固定的查询sql(第三版)
@Service
public class OrderService extends TemplateService { private static final String isPaySql = " AND (is_paid = 1 OR pay_type = 4 ) "; /** * 订单处理: * 过滤掉:合并拆分的订单 * 过滤掉:交易完成或交易关闭 * 要求:跑过预处理 * 要求:已付款或者货到付款 * 要求:未作废的 */ public static final String DEFALUT_FILTER = " AND archive_state IN (0, 1) AND oms_process_type = 1 " + isPaySql + " AND v_sale_order.is_invalidated=0 AND is_closed = 0"; /** * 订单查询: * 过滤掉:合并拆分的订单 */ public static final String HISTORY_FILTER = " AND archive_state IN (0, 1)"; public static final String AFTER_FILTER = " AND archive_state IN (0,1,2) " + isPaySql; }
改进:
1.将之前的is_paid 移除之前的索引
2.调整索引的顺序,移除毫无辨识度的字段
(第二版)
CREATE INDEX oms_normal_v2 on sale_order_status(tenant_id,is_closed,oms_process_type,is_invalidated,last_update_time);
CREATE INDEX oms_check_v2 on sale_order_status(tenant_id,is_closed,oms_process_type,is_invalidated,is_checked,last_update_time);
CREATE INDEX oms_suspend_v2 on sale_order_status(tenant_id,is_closed,oms_process_type,is_invalidated,is_suspended,last_update_time);
Q&A:
1.MySQL视图可以用索引吗?
我想答案是肯定的,其索引是建立在视图后面的真实表上,而不是建立在视图上.
索引是存放在模式（schema）中的一个数据库对象，索引的作用就是提高对表的检索查询速度，索引是通过快速访问的方法来进行快速定位数据，从而减少了对磁盘的读写操作。索引是数据库的一个对象，它不能独立存在，必须对某个表对象进行依赖。
视图就是一个表或多个表的查询结果，它是一张虚拟的表，因为它并不能存储数据。
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