[GitHub] [airflow] ashb commented on a change in pull request #12890: Changes the type of source_code field in DagCode to MEDIUMTEXT

[GitBox <gi...@apache.org>]

ashb commented on a change in pull request #12890:
URL: https://github.com/apache/airflow/pull/12890#discussion_r537860951



##########
File path: airflow/migrations/versions/e959f08ac86c_change_field_in_dagcode_to_mediumtext_.py
##########
@@ -0,0 +1,43 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Change field in DagCode to MEDIUMTEXT for MySql
+
+Revision ID: e959f08ac86c
+Revises: 64a7d6477aae
+Create Date: 2020-12-07 16:31:43.982353
+
+"""
+from alembic import context, op
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision = 'e959f08ac86c'
+down_revision = '64a7d6477aae'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():  # noqa: D103
+    if context.config.get_main_option('sqlalchemy.url').startswith('mysql'):

Review comment:
       The op.get_bind() style is used much more:
   
   ```
   co~/code/airflow/airflow master*
   airflow ❯ git grep conn.dialect.name ./airflow/migrations/versions | wc -l
   54
   
   ~/code/airflow/airflow master*
   airflow ❯ git grep context.config.get_main_option ./airflow/migrations/versions | wc -l
   4
   ```




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