mysql 在位置替换字符

Question

If I have a variable in a stored procedure like this: declare str varchar(10); set str = 'ABCD';

How do I change a character in the string at an arbitrary position? For example: in the procedure x is 3. I need to change str so it becomes str = 'AB*D';

This means that, as x is equals to 3, in the string, the character at the position 3, should be changed to '*'.

Answer 1

You can do this with string manipulations:

select concat(left(str, 2), '*', substring(str, 4, 10))

Or, you can use the insert() function:

select insert(str, 3, 1, '*')