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1.问题描述
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mysql版本：mariadb 10.1.16,采用utf8-ci，不区分大小写的排序规则。
开发人员反应业务要求要区分大小写，就是说当输入小写条件时，只能返回小写条件对应的数据，不能返回大写。
dba@192.168.19.215:3306mdls01:58:57SELECT
- cabinet_no
- FROM
- go_task_ycon_refrence gtyr
- WHERE
- 1 = 1
- AND cabinet_no = 'abcd4499503'
- ORDER BY
- 1 ASC;
+-------------+
| cabinet_no |
+-------------+
| ABCD4499503 |
+-------------+
1 row in set (0.00 sec)
2.问题解决
在条件字段后面加COLLATE utf8_bin ，或在表级或字段级指定COLLATE utf8_bin
dba@192.168.19.215:3306mdls02:08:08SELECT
- cabinet_no
- FROM
- gtyr
- WHERE
- 1 = 1
- AND cabinet_no COLLATE utf8_bin = 'ABCDU4499503'
- ORDER BY
- 1 ASC;
+-------------+
| cabinet_no |
+-------------+
| ABCD4499503 |
+-------------+
1 row in set (0.00 sec)
dba@192.168.19.215:3306mdls02:08:43SELECT
- cabinet_no
- FROM
- gtyr
- WHERE
- 1 = 1
- AND cabinet_no COLLATE utf8_bin = 'abcd4499503'
- ORDER BY
- 1 ASC;
Empty set (0.00 sec)
1、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,
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:
Warnings:
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,
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:
Warnings:
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,
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:
Warnings:
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)
字符串都是区分大小写的，都是用upper(字符串)转大写
lower(字符串)转小写