Insert builder: fix mutually exclusive methods

[belchior]

Mutually exclusive methods on Insert builder

Avaliable on sqlite only

Methods Insert::insert_into, Insert::insert_or and Insert::replace_into are mutually exclusive, the last called will overrides the previous ones.

#[cfg(feature = "sqlite")]
{
  use sql_query_builder as sql;

  let insert = sql::Insert::new()
    .insert_into("users (login, name)")
    .replace_into("users (login, name)")
    .as_string();
}

Output

REPLACE INTO users (login, name)

Avaliable on mysql only

Methods Insert::insert_into and the splitted version (Insert::insert, Insert::into, Insert::column) are mutually exclusive, the last called will overrides the previous ones.

#[cfg(feature = "mysql")]
{
  use sql_query_builder as sql;

  let insert = sql::Insert::new()
    .insert_into("users (login, name)")
    .insert("low_priority")
    .into("users")
    .column("login")
    .as_string();
}

Output

INSERT low_priority INTO users (login)