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JenBurleson
6年前发布

使MySQL查询区分大小写的实现方法

来自: http://blog.csdn.net//jiao_fuyou/article/details/40505573


1、一种方法是可以设置数据库、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: 
   注意:如果表已经建立并且有数据,原来又没有区分大小写,这时alter table是没用的,只能更新列的属性
   
*_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 
########### 


2、另外一种方法 


########### 
# 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 
########### 


3、还有一种方法就是在查询时指定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)
</span>

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