Use caution when going "there" but here are some examples of David's Prayers
Psalm 3: David prays while fleeing from his son Absalom, asking God to protect him and pleading, "Strike all my enemies on the jaw; break the teeth of the wicked".
Psalm 59: Facing enemies who stalked his house without cause (such as King Saul's men), David asks God to consume them in wrath and be his fortress.
Psalm 109: A powerful prayer of judgment where David asks God to hold his enemies accountable, find them guilty, shorten their days, and leave their families destitute.