Okla. Stat. tit. 12, § 12-683: Dismissal of action - Grounds and time

Except as provided in Section 684.1 of this title, an action may

be dismissed, without prejudice to a future action:

1. By the plaintiff, before the final submission of the case to

the jury, or to the court, where the trial is by the court;

2. By the court, where the plaintiff fails to appear on the

trial;

3. By the court, for the want of necessary parties;

4. By the court, on the application of some of the defendants,

where there are others whom the plaintiff fails to prosecute with

diligence;

5. By the court, for disobedience by the plaintiff of an order

concerning the proceedings in the action; and

6. In all other cases, upon the trial of the action, the

decision must be upon the merits.