您可以像这样使用二进制区分大小写

select * from tb_app where BINARY android_package='com.Mtime';

不幸的是，此SQL不能使用索引，依赖于该索引的查询将遭受性能损失

mysql> explain select * from tb_app where BINARY android_package='com.Mtime';
+----+-------------+--------+------------+------+---------------+------+---------+------+---------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys | key  | key_len | ref  | rows    | filtered | Extra       |
+----+-------------+--------+------------+------+---------------+------+---------+------+---------+----------+-------------+
|  1 | SIMPLE      | tb_app | NULL       | ALL  | NULL          | NULL | NULL    | NULL | 1590351 |   100.00 | Using where |
+----+-------------+--------+------------+------+---------------+------+---------+------+---------+----------+-------------+

幸运的是，我有一些技巧来解决这个问题

mysql> explain select * from tb_app where android_package='com.Mtime' and BINARY android_package='com.Mtime';
+----+-------------+--------+------------+------+---------------------------+---------------------------+---------+-------+------+----------+-----------------------+
| id | select_type | table  | partitions | type | possible_keys             | key                       | key_len | ref   | rows | filtered | Extra                 |
+----+-------------+--------+------------+------+---------------------------+---------------------------+---------+-------+------+----------+-----------------------+
|  1 | SIMPLE      | tb_app | NULL       | ref  | idx_android_pkg           | idx_android_pkg           | 771     | const |    1 |   100.00 | Using index condition |
+----+-------------+--------+------------+------+---------------------------+---------------------------+---------+-------+------+----------+-----------------------+  

您可以像这样使用二进制区分大小写

select * from tb_app where BINARY android_package='com.Mtime';

不幸的是，此SQL不能使用索引，依赖于该索引的查询将遭受性能损失

mysql> explain select * from tb_app where BINARY android_package='com.Mtime';
+----+-------------+--------+------------+------+---------------+------+---------+------+---------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys | key  | key_len | ref  | rows    | filtered | Extra       |
+----+-------------+--------+------------+------+---------------+------+---------+------+---------+----------+-------------+
|  1 | SIMPLE      | tb_app | NULL       | ALL  | NULL          | NULL | NULL    | NULL | 1590351 |   100.00 | Using where |
+----+-------------+--------+------------+------+---------------+------+---------+------+---------+----------+-------------+

幸运的是，我有一些技巧来解决这个问题

mysql> explain select * from tb_app where android_package='com.Mtime' and BINARY android_package='com.Mtime';
+----+-------------+--------+------------+------+---------------------------+---------------------------+---------+-------+------+----------+-----------------------+
| id | select_type | table  | partitions | type | possible_keys             | key                       | key_len | ref   | rows | filtered | Extra                 |
+----+-------------+--------+------------+------+---------------------------+---------------------------+---------+-------+------+----------+-----------------------+
|  1 | SIMPLE      | tb_app | NULL       | ref  | idx_android_pkg           | idx_android_pkg           | 771     | const |    1 |   100.00 | Using index condition |
+----+-------------+--------+------------+------+---------------------------+---------------------------+---------+-------+------+----------+-----------------------+  

太好了!

我和你们分享一个比较密码的函数的代码:

SET pSignal =
(SELECT DECODE(r.usignal,'YOURSTRINGKEY') FROM rsw_uds r WHERE r.uname =
in_usdname AND r.uvige = 1);

SET pSuccess =(SELECT in_usdsignal LIKE BINARY pSignal);

IF pSuccess = 1 THEN
      /*Your code if match*/
ELSE
      /*Your code if don't match*/

END IF;

好消息是，如果你需要进行区分大小写的查询，这很容易做到:

SELECT *  FROM `table` WHERE BINARY `column` = 'value'

要在使用BINARY之前使用索引，如果有大型表，可以这样做。

SELECT
   *
FROM
   (SELECT * FROM `table` WHERE `column` = 'value') as firstresult
WHERE
   BINARY `column` = 'value'

子查询将生成一个非常小的不区分大小写的子集，然后选择其中唯一区分大小写的匹配项。

不需要改变任何DB级别，只是你必须改变SQL查询它将工作。

的例子,

“SELECT * FROM <TABLE> where userId = ' ' ' + iv_userId + ' ' AND password = ' ' ' ' ' + iv_password + ' '";

二进制关键字将区分大小写。