diff --git a/doc/source/whatsnew/v2.2.1.rst b/doc/source/whatsnew/v2.2.1.rst index 5e814ec2a1b92..ca4fef4f57fb6 100644 --- a/doc/source/whatsnew/v2.2.1.rst +++ b/doc/source/whatsnew/v2.2.1.rst @@ -31,6 +31,7 @@ Fixed regressions - Fixed regression in :meth:`DataFrame.sort_index` not producing a stable sort for a index with duplicates (:issue:`57151`) - Fixed regression in :meth:`DataFrame.to_dict` with ``orient='list'`` and datetime or timedelta types returning integers (:issue:`54824`) - Fixed regression in :meth:`DataFrame.to_json` converting nullable integers to floats (:issue:`57224`) +- Fixed regression in :meth:`DataFrame.to_sql` when ``method="multi"`` is passed and the dialect type is not Oracle (:issue:`57310`) - Fixed regression in :meth:`DataFrameGroupBy.idxmin`, :meth:`DataFrameGroupBy.idxmax`, :meth:`SeriesGroupBy.idxmin`, :meth:`SeriesGroupBy.idxmax` ignoring the ``skipna`` argument (:issue:`57040`) - Fixed regression in :meth:`DataFrameGroupBy.idxmin`, :meth:`DataFrameGroupBy.idxmax`, :meth:`SeriesGroupBy.idxmin`, :meth:`SeriesGroupBy.idxmax` where values containing the minimum or maximum value for the dtype could produce incorrect results (:issue:`57040`) - Fixed regression in :meth:`ExtensionArray.to_numpy` raising for non-numeric masked dtypes (:issue:`56991`) diff --git a/pandas/core/generic.py b/pandas/core/generic.py index 55693d4cdb753..62dd0c3bf0161 100644 --- a/pandas/core/generic.py +++ b/pandas/core/generic.py @@ -2969,6 +2969,9 @@ def to_sql( database. Otherwise, the datetimes will be stored as timezone unaware timestamps local to the original timezone. + Not all datastores support ``method="multi"``. Oracle, for example, + does not support multi-value insert. + References ---------- .. [1] https://docs.sqlalchemy.org diff --git a/pandas/io/sql.py b/pandas/io/sql.py index 3a58daf681cfb..195a7c5040853 100644 --- a/pandas/io/sql.py +++ b/pandas/io/sql.py @@ -1012,22 +1012,19 @@ def _execute_insert(self, conn, keys: list[str], data_iter) -> int: def _execute_insert_multi(self, conn, keys: list[str], data_iter) -> int: """ - Alternative to _execute_insert for DBs support multivalue INSERT. + Alternative to _execute_insert for DBs support multi-value INSERT. Note: multi-value insert is usually faster for analytics DBs and tables containing a few columns but performance degrades quickly with increase of columns. + """ from sqlalchemy import insert data = [dict(zip(keys, row)) for row in data_iter] - stmt = insert(self.table) - # conn.execute is used here to ensure compatibility with Oracle. - # Using stmt.values(data) would produce a multi row insert that - # isn't supported by Oracle. - # see: https://docs.sqlalchemy.org/en/20/core/dml.html#sqlalchemy.sql.expression.Insert.values - result = conn.execute(stmt, data) + stmt = insert(self.table).values(data) + result = conn.execute(stmt) return result.rowcount def insert_data(self) -> tuple[list[str], list[np.ndarray]]: