It shall be sufficient, upon the first motion by the State for a continuance, if the same be for the want of a witness, to state:
1. The name of the witness and his residence, if known, or that his residence is unknown;
2. The diligence which has been used to procure his attendance; and it shall not be considered sufficient diligence to have caused to be issued, or to have applied for, a subpoena, in cases where the law authorized an attachment to issue; and
3. That the testimony of the witness is believed by the applicant to be material for the State.