Add min() and max() methods to Database

lib/nntp/tiny/db.py

@@ -117,6 +117,20 @@ class Database():
     def get(self, table, values: dict=dict()):
         return self.query(table, values).fetchone()
 
+    def min(self, table, column: str) -> int:
+        sql = f"select min({column}) as _min from {table.name}"
+
+        row = self.db.execute(sql).fetchone()
+
+        return row[0] if row is not None else None
+
+    def max(self, table, column: str) -> int:
+        sql = f"select max({column}) as _max from {table.name}"
+
+        row = self.db.execute(sql).fetchone()
+
+        return row[0] if row is not None else None
+
     def count(self, table, values: dict=dict()):
         sql = f"select count(id) as num from {table.name}"