luizotavio32 commented on code in PR #31303:
URL: https://github.com/apache/superset/pull/31303#discussion_r1878692788
##########
superset/migrations/shared/utils.py:
##########
@@ -185,15 +193,211 @@ def has_table(table_name: str) -> bool:
return table_exists
-def add_column_if_not_exists(table_name: str, column: sa.Column) -> None:
+def drop_fks_for_table(table_name: str) -> None:
+ """
+ Drop all foreign key constraints for a table if it exist and the database
+ is not sqlite.
+
+ :param table_name: The table name to drop foreign key constraints for
+ """
+ connection = op.get_bind()
+ inspector = Inspector.from_engine(connection)
+
+ if isinstance(connection.dialect, SQLiteDialect):
+ return # sqlite doesn't like constraints
+
+ if has_table(table_name):
+ foreign_keys = inspector.get_foreign_keys(table_name)
+
+ for fk in foreign_keys:
+ op.drop_constraint(fk["name"], table_name, type_="foreignkey")
+
+
+logger = logging.getLogger("alembic")
+
+
+def create_table(table_name: str, *columns: SchemaItem) -> None:
+ """
+ Creates a database table with the specified name and columns.
+
+ This function checks if a table with the given name already exists in the
database.
+ If the table exists, it logs an informational message and skips the
creation process.
+ Otherwise, it proceeds to create a new table using the provided name and
schema columns.
+
+ :param table_name: The name of the table to be created.
+ :param columns: A variable number of arguments representing the schema
just like when calling alembic's method create_table()
+ """
+
+ if has_table(table_name=table_name):
+ logger.info(f"Table {LRED}{table_name}{RESET} already exists
Skipping...")
+ return
+
+ logger.info(f"Creating table {GREEN}{table_name}{RESET}...")
+ op.create_table(table_name, *columns)
+ logger.info(f"Table {GREEN}{table_name}{RESET} created")
+
+
+def drop_table(table_name: str) -> None:
"""
- Adds a column to a table if it does not already exist.
+ Drops a database table with the specified name.
- :param table_name: Name of the table.
- :param column: SQLAlchemy Column object.
+ This function checks if a table with the given name exists in the database.
+ If the table does not exist, it logs an informational message and skips
the dropping process.
+ If the table exists, it first attempts to drop all foreign key constraints
associated with the table
+ (handled by `drop_fks_for_table`) and then proceeds to drop the table.
+
+ :param table_name: The name of the table to be dropped.
+ """
+
+ if not has_table(table_name=table_name):
+ logger.info(f"Table {GREEN}{table_name}{RESET} doesn't exist
Skipping...")
+ return
+
+ logger.info(f"Dropping table {GREEN}{table_name}{RESET}...")
+ drop_fks_for_table(table_name)
+ op.drop_table(table_name=table_name)
+ logger.info(f"Table {GREEN}{table_name}{RESET} dropped")
+
+
+def batch_operation(
+ callable: Callable[[int, int], None], count: int, batch_size: int
+) -> None:
+ """
+ Executes an operation by dividing a task into smaller batches and tracking
progress.
+
+ This function is designed to process a large number of items in smaller
batches. It takes a callable
+ that performs the operation on each batch. The function logs the progress
of the operation as it processes
+ through the batches.
+
+ :param callable: A callable function that takes two integer arguments:
+ the start index and the end index of the current batch.
+ :param count: The total number of items to process.
+ :param batch_size: The number of items to process in each batch.
+ """
+ for offset in range(0, count, batch_size):
+ percentage = (offset / count) * 100 if count else 0
+ logger.info(f"Progress: {offset:,}/{count:,} ({percentage:.2f}%)")
+ callable(offset, min(offset + batch_size, count))
+
+ logger.info(f"Progress: {count:,}/{count:,} (100%)")
Review Comment:
Should I add a condition to skip this informational if count = 0 or print
it: `Progress: 1/1 (100%)` ?
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