Auto Increment varchar in MySQL

Question

Is there a way to set primary key auto increment, type of varchar in mySql?

Answer 1

AutoIncrement fields are integer in mysql.

You can mirror the auto-increment field in a varchar field and create a trigger which updates the varchar field on insert/update.

Create Trigger

Answer 2

Duplication of MySQL - how to use VARCHAR as AUTO INCREMENT Primary Key

According to my point of view you have to change it as integer type. Since AUTO_INCREMENT is for INT type only, moreover setting the field as PRIMARY KEY which prevents duplication of values.

Answer 3

NONE. So far, AUTO_INCREMENT can be set for INT only. It needs to have your own logic to do that. eg,

• Get Last ID
• Get the INT part within the string
• Increment the value
• Concatenate
• Save to DB

Answer 4

for my experience, you can make Varcar ID as auto increment but you must have logic..let say

 Dim crnum As String = "CR00001"
    Dim iTemp As Integer = 0

                iTemp = CInt(crnum.Substring(4, crnum.Length - 4)) '// get only the #'s from String and Convert them to Integer.
                iTemp += 1 '// increase the ID # + 1.
                crnum = crnum.Substring(0, 4) & iTemp.ToString("00000") '// set the ID back with String and #'s formatted to 5 digit #.

but you must do your own logic ,because after u run it for second time it will become duplicate primary key so, you must think your logic to apply your code. Anything is possible. ;)