feat:mysql adaptation for meta db (#50)

* phase1:uuid stringdefault timestamp date

* phase2:json adapt

* phase3:BinaryData,ARRAY,Text,

* fix sa.String()

* fix defalut valud

* models adapt

* models adapt supplement

* fix pg unique dialect

* supplement

* migration fix

* migration fix

* date sql adapt

* model adapt fix

* config adapt

* migration fix

* fix

* fix anotation in .env.example

* config feat

* config fix

* .env.example adapt fix

api/services/workflow_draft_variable_service.py

@@ -7,7 +7,8 @@ from enum import StrEnum
 from typing import Any, ClassVar
 
 from sqlalchemy import Engine, orm, select
-from sqlalchemy.dialects.postgresql import insert
+from sqlalchemy.dialects.mysql import insert as mysql_insert
+from sqlalchemy.dialects.postgresql import insert as pg_insert
 from sqlalchemy.orm import Session, sessionmaker
 from sqlalchemy.sql.expression import and_, or_
 
@@ -627,28 +628,51 @@ def _batch_upsert_draft_variable(
     #
     # For these reasons, we use the SQLAlchemy query builder and rely on dialect-specific
     # insert operations instead of the ORM layer.
-    stmt = insert(WorkflowDraftVariable).values([_model_to_insertion_dict(v) for v in draft_vars])
-    if policy == _UpsertPolicy.OVERWRITE:
-        stmt = stmt.on_conflict_do_update(
-            index_elements=WorkflowDraftVariable.unique_app_id_node_id_name(),
-            set_={
+    
+    # Use different insert statements based on database type
+    if dify_config.SQLALCHEMY_DATABASE_URI_SCHEME == "postgresql":
+        stmt = pg_insert(WorkflowDraftVariable).values([_model_to_insertion_dict(v) for v in draft_vars])
+        if policy == _UpsertPolicy.OVERWRITE:
+            stmt = stmt.on_conflict_do_update(
+                index_elements=WorkflowDraftVariable.unique_app_id_node_id_name(),
+                set_={
+                    # Refresh creation timestamp to ensure updated variables
+                    # appear first in chronologically sorted result sets.
+                    "created_at": stmt.excluded.created_at,
+                    "updated_at": stmt.excluded.updated_at,
+                    "last_edited_at": stmt.excluded.last_edited_at,
+                    "description": stmt.excluded.description,
+                    "value_type": stmt.excluded.value_type,
+                    "value": stmt.excluded.value,
+                    "visible": stmt.excluded.visible,
+                    "editable": stmt.excluded.editable,
+                    "node_execution_id": stmt.excluded.node_execution_id,
+                    "file_id": stmt.excluded.file_id,
+                },
+            )
+        elif policy == _UpsertPolicy.IGNORE:
+            stmt = stmt.on_conflict_do_nothing(index_elements=WorkflowDraftVariable.unique_app_id_node_id_name())
+    else:
+        stmt = mysql_insert(WorkflowDraftVariable).values([_model_to_insertion_dict(v) for v in draft_vars])
+        if policy == _UpsertPolicy.OVERWRITE:
+            stmt = stmt.on_duplicate_key_update(
                 # Refresh creation timestamp to ensure updated variables
                 # appear first in chronologically sorted result sets.
-                "created_at": stmt.excluded.created_at,
-                "updated_at": stmt.excluded.updated_at,
-                "last_edited_at": stmt.excluded.last_edited_at,
-                "description": stmt.excluded.description,
-                "value_type": stmt.excluded.value_type,
-                "value": stmt.excluded.value,
-                "visible": stmt.excluded.visible,
-                "editable": stmt.excluded.editable,
-                "node_execution_id": stmt.excluded.node_execution_id,
-                "file_id": stmt.excluded.file_id,
-            },
-        )
-    elif policy == _UpsertPolicy.IGNORE:
-        stmt = stmt.on_conflict_do_nothing(index_elements=WorkflowDraftVariable.unique_app_id_node_id_name())
-    else:
+                created_at=stmt.inserted.created_at,
+                updated_at=stmt.inserted.updated_at,
+                last_edited_at=stmt.inserted.last_edited_at,
+                description=stmt.inserted.description,
+                value_type=stmt.inserted.value_type,
+                value=stmt.inserted.value,
+                visible=stmt.inserted.visible,
+                editable=stmt.inserted.editable,
+                node_execution_id=stmt.inserted.node_execution_id,
+                file_id=stmt.inserted.file_id,
+            )
+        elif policy == _UpsertPolicy.IGNORE:
+            stmt = stmt.prefix_with("IGNORE")
+    
+    if policy not in [_UpsertPolicy.OVERWRITE, _UpsertPolicy.IGNORE]:
         raise Exception("Invalid value for update policy.")
     session.execute(stmt)