Mysql字段内容区分大小写（大小写敏感）的问题

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Mysql字段内容区分大小写（大小写敏感）的问题

2023-08-27 09:08| 来源: 网络整理| 查看: 265

Mysql区分大小写（大小写敏感）的问题

(ps: 1，mysql的字段名称是不区分大小写的 2，字段的内容可以设置是否区分大小写）

MySQL默认是不区分大小写的，但是在很多情况下需要大小敏感，以下总结了多种设置MySQL大小写敏感的方法。

方法一：

修改MySql Server安装目录下的 my.ini 文件，

在mysqld节下加入下面一行

set-variable=lower_case_table_names=0 （0：大小写敏感；1：大小写不敏感）

最后重启一下MySql服务即可。

方法二：

一种方法是可以设置表或行的collation，使其为binary或case sensitive。在MySQL中，对于Column Collate其约定的命名方法如下：

*_bin: 表示的是binary case sensitive collation，也就是说是区分大小写的 *_cs: case sensitive collation，区分大小写 *_ci: case insensitive collation，不区分大小写

########### # Start binary collation example ########### mysql> create table case_bin_test (word VARCHAR(10)) CHARACTER SET latin1 COLLATE latin1_bin; Query OK, 0 rows affected (0.02 sec) mysql> INSERT INTO case_bin_test VALUES ('Frank'),('Google'),('froogle'),('flickr'),('FlicKr'); Query OK, 5 rows affected (0.00 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> SELECT * FROM case_bin_test WHERE word LIKE 'f%'; +---------+ | word | +---------+ | froogle | | flickr | +---------+ 2 rows in set (0.00 sec) mysql> SELECT * FROM case_bin_test WHERE word LIKE 'F%'; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.00 sec) ########### # End ########### 方法三： ########### # Start case sensitive collation example ########### mysql> create table case_cs_test (word VARCHAR(10)) CHARACTER SET latin1 COLLATE latin1_general_cs; Query OK, 0 rows affected (0.08 sec) mysql> INSERT INTO case_cs_test VALUES ('Frank'),('Google'),('froogle'),('flickr'),('FlicKr'); Query OK, 5 rows affected (0.00 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> SELECT * FROM case_cs_test WHERE word LIKE 'F%'; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.00 sec) mysql> SELECT * FROM case_cs_test WHERE word LIKE 'f%'; +---------+ | word | +---------+ | froogle | | flickr | +---------+ 2 rows in set (0.00 sec) ########### # end ########### 方法四：就是在查询时指定collation mysql> create table case_test (word VARCHAR(10)) CHARACTER SET latin1; Query OK, 0 rows affected (0.01 sec) mysql> INSERT INTO case_test VALUES ('Frank'),('Google'),('froogle'),('flickr'),('FlicKr'); Query OK, 7 rows affected (0.01 sec) Records: 7 Duplicates: 0 Warnings: 0 mysql> SELECT * FROM case_test WHERE word LIKE 'f%'; +---------+ | word | +---------+ | Frank | | froogle | | flickr | | FlicKr | +---------+ 6 rows in set (0.01 sec) mysql> SELECT * FROM case_test WHERE word LIKE 'F%'; +---------+ | word | +---------+ | Frank | | froogle | | flickr | | FlicKr | +---------+ 6 rows in set (0.01 sec) mysql> SELECT * FROM case_test WHERE word COLLATE latin1_bin LIKE 'F%'; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.05 sec) mysql> SELECT * FROM case_test WHERE word COLLATE latin1_bin LIKE 'f%'; +---------+ | word | +---------+ | froogle | | flickr | +---------+ 2 rows in set (0.00 sec) mysql> SELECT * FROM case_test WHERE word LIKE 'f%' COLLATE latin1_bin; +---------+ | word | +---------+ | froogle | | flickr | +---------+ 2 rows in set (0.00 sec) mysql> SELECT * FROM case_test WHERE word LIKE 'F%' COLLATE latin1_bin; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.01 sec) mysql> SELECT * FROM case_test WHERE word LIKE 'F%' COLLATE latin1_general_cs; +---------+ | word | +---------+ | Frank | | FlicKr | +---------+ 4 rows in set (0.04 sec) 方法五：要让mysql查询区分大小写，可以： select * from table_name where binary a like 'a%' select * from table_name where binary a like 'A%'

也可以在建表时，加以标识

create table table_name( a varchar (20) binary )

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Mysql字段内容区分大小写（大小写敏感）的问题

Mysql字段内容区分大小写（大小写敏感）的问题

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