How to limit length of Varchar between 2 and 100 - mysql

Question

I have a table in MySQL database with a column named "name". I want that whenever any query comes to store name in this column, name's length should be >2 and <= 100.
And the name should start with alphabet only.
I don't want to place this check on Database Table. I want to place this check inside code.
#Entity
#Table(name = "member")
public class Member implements Serializable{
private static final long serialVersionUID = 9045098179799205444L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
#Column(name = "name")
String name;
#Column(name = "email")
String email;
}

Answer 1

Validate it before the persistence with javax.validation.constraints.Size;
#Size(min = 2, max = 200, message
= "name field must be between 2and 200 characters")
#Column(name = "name")
String name;

Answer 2

There are Bean Validation annotations, like #Size and #Pattern for this purpose. You can annotate the desired field with them. Here is a list of those annotations.

Answer 3

I don't want to place this check on Database Table. I want to place this check inside code.
EDIT: This post is for people who don't want to use annotations and if you consider the Entity as 'Datatable'. If you want to use annotations then use the regex below with the #Pattern annotation
Well, if you don't want to store this in the database you either need to handle this in the service layer above the POJO or inside the Model Member Class.
Depending on your perspective towards POJO/DTO with or without business logic.
The check itself would be as simple as
public void setName(String name){
Pattern pattern = Pattern.compile("^[A-Za-z].{1,100}");
Matcher matcher = pattern.matcher(test);
if(matcher.matches()){
// save here
}else{
// handle error here (exception?!)
}
}
This pattern checks, wheater the string starts with an alphabet character and has at least 2 more character after the alphabet character, up to a maximum of 99 characters after the first one.