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  • regexp

    regexp binary  匹配 可以区分大小写;
    
    regexp           匹配 不会区分大小写;
    时间 - 状态 - 响应时间(ms) - 来源->执行数据库,mysql_connect_id
    
    ------------------------------
    
    sql
    
    2020/07/02 17:23:52 - OK - 15307.5 - 10.10.10.11:20236->10.10.10.10:3306,mysql_connect_id=102783
    ------------------------------
    select endpoint, id from endpoint  WHERE lower(endpoint) regexp 'a8-apple-iphone-db*;

    模糊匹配的时候,有时候确实需要忽略大小写,但是直接使用mysql的函数作用于字段(该字段有索引),则会导致索引失效,从而导致全表扫描的慢查询,影响很大。这时候应该使用
    regexp binary 来进行模糊匹配。




    ###########################

    测试案例如下:

    ##########################

    igoodful@a8-apple-iphone-db01(oneservice) > show create table appleG *************************** 1. row *************************** Table: apple Create Table: CREATE TABLE `apple` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '应用id自增主键', `address` varchar(64) NOT NULL DEFAULT '' COMMENT '真实应用APP的ID', `name` varchar(64) NOT NULL DEFAULT '' COMMENT '应用名称', PRIMARY KEY (`id`), KEY `idx_name` (`name`), KEY `idx_address` (`address`) ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COMMENT='应用信息表' 1 row in set (0.00 sec) Fri Jul 3 10:42:23 2020 igoodful@a8-apple-iphone-db01(oneservice) > select * from apple; +----+----------------------+------+ | id | address | name | +----+----------------------+------+ | 1 | c3-dba-cloud-cc01.bj | 1 | | 2 | C3-DBA-CLOUD-CC01.bj | 2 | +----+----------------------+------+ 2 rows in set (0.00 sec) Fri Jul 3 10:42:44 2020 igoodful@a8-apple-iphone-db01(oneservice) > select * from apple where address regexp 'c3*'; +----+----------------------+------+ | id | address | name | +----+----------------------+------+ | 1 | c3-dba-cloud-cc01.bj | 1 | | 2 | C3-DBA-CLOUD-CC01.bj | 2 | +----+----------------------+------+ 2 rows in set (0.00 sec) Fri Jul 3 10:42:52 2020 igoodful@a8-apple-iphone-db01(oneservice) > select * from apple where address regexp binary 'c3*'; +----+----------------------+------+ | id | address | name | +----+----------------------+------+ | 1 | c3-dba-cloud-cc01.bj | 1 | +----+----------------------+------+ 1 row in set (0.01 sec) Fri Jul 3 10:42:57 2020 igoodful@a8-apple-iphone-db01(oneservice) > select * from apple where address regexp 'c3-dba-cloud*'; +----+----------------------+------+ | id | address | name | +----+----------------------+------+ | 1 | c3-dba-cloud-cc01.bj | 1 | | 2 | C3-DBA-CLOUD-CC01.bj | 2 | +----+----------------------+------+ 2 rows in set (0.00 sec) Fri Jul 3 10:44:20 2020 igoodful@a8-apple-iphone-db01(oneservice) >
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  • 原文地址:https://www.cnblogs.com/igoodful/p/13226401.html
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