ALTER TABLE ADD COLUMN IF NOT EXISTS in SQLite

Question

We\'ve recently had the need to add columns to a few of our existing SQLite database tables. This can be done with ALTER TABLE ADD COLUMN. Of course, if the table has alre

Answer 1

I solve it in 2 queries. This is my Unity3D script using System.Data.SQLite.

IDbCommand command = dbConnection.CreateCommand();
            command.CommandText = @"SELECT count(*) FROM pragma_table_info('Candidat') c WHERE c.name = 'BirthPlace'";
            IDataReader reader = command.ExecuteReader();
            while (reader.Read())
            {
                try
                {
                    if (int.TryParse(reader[0].ToString(), out int result))
                    {
                        if (result == 0)
                        {
                            command = dbConnection.CreateCommand();
                            command.CommandText = @"ALTER TABLE Candidat ADD COLUMN BirthPlace VARCHAR";
                            command.ExecuteNonQuery();
                            command.Dispose();
                        }
                    }
                }
                catch { throw; }
            }