Question

Can I restrict the data length for a column value in sqlite3?

ex: varchar name(5), Insert statement accepts more than 5 characters.

Answer 1

SQLite treats varchar(5) as text (i.e. unlimited string) but you can add a CHECK constraint to the column:

create table pancakes (
    name text check(name is null or length(name) <= 5)
)

This will give you a “constraint failed” error if your name is too long:

sqlite> create table pancakes (name text not null check(length(name) <= 5));
sqlite> insert into pancakes (name) values ('1234');
sqlite> insert into pancakes (name) values ('12345');
sqlite> insert into pancakes (name) values ('123456');
Error: constraint failed