added the ast class for ALTER DATABASE

Author: MinuraPunchihewa

mindsdb_sql_parser/ast/mindsdb/alter_database.py

@@ -0,0 +1,34 @@
+from mindsdb_sql_parser.ast.base import ASTNode
+from mindsdb_sql_parser.ast.select import Identifier
+from mindsdb_sql_parser.utils import indent
+
+
+class AlterDatabase(ASTNode):
+    """
+    Alter a database.
+    """
+    def __init__(self, name: Identifier, altered_params: dict, *args, **kwargs):
+        """
+        Args:
+            name: Identifier -- name of the database to alter.
+            altered_params: dict -- parameters to alter in the database.
+        """
+        super().__init__(*args, **kwargs)
+        self.name = name
+        self.params = altered_params
+
+    def to_tree(self, *args, level=0, **kwargs):
+        ind = indent(level)
+        out_str = f'{ind}AlterDatabase(' \
+                  f'name={self.name.to_string()}, ' \
+                  f'altered_params={self.params})'
+        return out_str
+
+    def get_string(self, *args, **kwargs):
+        params = self.params.copy()
+
+        set_ar = [f'{k}={repr(v)}' for k, v in params.items()]
+        set_str = ', '.join(set_ar)
+
+        out_str = f'ALTER DATABASE {self.name.to_string()} {set_str}'
+        return out_str