解决linux下mysql区分大小写问题
linux 下，mysql 的默认是区分大小写的，而windows 下默认不区分大小写，我们大多数在windows 下开发，之后迁移到linux。我们可以通过修改配置使得在linux下，myql 表名不区分大小写。（以下分几种情况介绍）
一、如果有/etc/my.cnf文件，则直接修改此文件并重启mysql
1.在[mysqld]下面添加一句：
lower_case_table_names =1
2.重启mysql
service mysql restart
3.进入mysql，输入命令查看是否配置成功
show variables like "%case%"; （显示为1即为成功）
二、如果没有/etc/my.cnf文件，但是有/usr/share/mysql/my-default.cnf文件
1.将/usr/share/mysql/my-default.cnf文件复制一份到/etc/下，并改名为my.cnf
cp /usr/share/mysql/my-default.cnf /etc/my.cnf
2.在[mysqld]下面添加一句：
lower_case_table_names =1
3.重启mysql
service mysql restart
4.进入mysql，输入命令查看是否配置成功
show variables like "%case%"; （显示为1即为成功）
三、如果linux下这两个文件都无法找到（从5.7.18开始不在二进制包中提供my-default.cnf文件）
1.创建新文件/etc/my.cnf，并编辑以下内容（内容为从其他版本mysql中提取的样例）
vi /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[mysqld]
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
# These are commonly set, remove the # and set as required.
# basedir = .....
# datadir = .....
# port = .....
# server_id = .....
# socket = .....
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
2.在[mysqld]下面添加一句：
lower_case_table_names =1
3.重启mysql
service mysql restart
4.进入mysql，输入命令查看是否配置成功
show variables like "%case%"; （显示为1即为成功）
