win可用的mysql指令skill

安装、修复、更新或打包一个基于 Python 和 PyMySQL 实现的 Windows `mysql` 命令。适用于用户希望在 PowerShell/CMD 中输入 `mysql` 时重定向到 Python 实现、需要交互式输入 MySQL 连接信息、需要同步到当前用户本地 bin 目录，或需要将该能力封装成可公开复用的 Codex skill。

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--1.创建索引信息表
create table `t_index_update` (
  `table_name` varchar(20) collate gbk_bin default null,
  `index_name` varchar(20) collate gbk_bin default null,
  `index_cols` varchar(100) collate gbk_bin default null
) engine=innodb default charset=gbk collate=gbk_bin;
--2.插入线下索引信息表
insert into t_index_update()
select  
table_name,
index_name,
group_concat(distinct concat('`', column_name, '`') order by seq_in_index asc separator ', ') as index_cols
from information_schema.statistics
where  table_schema= 'elk'
and column_name'seq_id'
and index_name'primary'
group by table_name, index_name
order by table_name asc, index_name asc;
--3.同步线下索引信息表到线上
--4.构建删除和修改过的索引的删除语句
select concat('alter table `',a.table_name,'` drop index ',a.index_name,';')
from
(
     select  
     table_name,
     index_name,
     group_concat(distinct concat('`', column_name, '`') order by seq_in_index asc separator ', ') as index_cols
     from information_schema.statistics
     where  table_schema= 'elk'
     and column_name'seq_id'
     and index_name'primary'
     group by table_name, index_name
) a
left join t_index_update b on b.table_name and b.index_name=a.index_name and b.index_cols=a.index_cols
where b.index_name is null;
--5.构建新加索引的的新加语句
select concat('alter table `',a.table_name,'` add index ',a.index_name,'(',a.index_cols,');')
from t_index_update a
left join (
     select  
     table_name,
     index_name,
     group_concat(distinct concat('`', column_name, '`') order by seq_in_index asc separator ', ') as index_cols
     from information_schema.statistics
     where  table_schema= 'elk'
     and column_name'seq_id'
     and index_name'primary'
     group by table_name, index_name
) b   on b.table_name and b.index_name=a.index_name and b.index_cols=a.index_cols
where b.index_name is null;