Problem Description:
Problem: When modifying and deleting the specified characters in the comma-separated string in the project, other characters cannot be used.Cause Analysis:
The SQL statement is misspelled. The third parameter in replace() is omitted, and it is omitted. Wrong way of writing: update 表名
set 字段名= TRIM(BOTH ',' FROM replace(concat(',', 字段名, ','), #{传入的字符}, ''))
In mybatis, the correct dynamic SQL is as follows:
update 表名
set 字段名= TRIM(BOTH ',' FROM replace(concat(',', 字段名, ','), #{传入的字符}, ','))
ps: The incoming character is the character that needs to be deleted. It should be noted that commas need to be spliced before and after this character. If the character 12 in devid in the solution needs to be deleted, the incoming character should be: ',12, ' .
solution:
After comparing the following sql, a syntax error is found.
How to delete a character in a field in mysql
If the table name is user, the table is as follows
| id | david |
|---|---|
| 1 | 1,2,3,12,13,14 |
To delete the value of 1 in the devid field of the table user, note that 12, 13, and 13 cannot be deleted.
The sql syntax is as follows:
update user set devid = trim(both ‘,’ from replace(concat(’,’, devid, ‘,’), ‘,1,’, ‘,’))
Excerpted from (deleted): https://www.cnblogs.com/xiede/p/9369578.html