pandas.DataFrame.to_sql¶

DataFrame.to_sql(self, name: str, con, schema=None, if_exists: str = 'fail', index: bool = True, index_label=None, chunksize=None, dtype=None, method=None) → None[source]¶

Write records stored in a DataFrame to a SQL database.

Databases supported by SQLAlchemy [1] are supported. Tables can be newly created, appended to, or overwritten.

Parameters

namestr

Name of SQL table.

consqlalchemy.engine.Engine or sqlite3.Connection

Using SQLAlchemy makes it possible to use any DB supported by that library. Legacy support is provided for sqlite3.Connection objects. The user is responsible for engine disposal and connection closure for the SQLAlchemy connectable See here

schemastr, optional

Specify the schema (if database flavor supports this). If None, use default schema.

if_exists{‘fail’, ‘replace’, ‘append’}, default ‘fail’

How to behave if the table already exists.

fail: Raise a ValueError.
replace: Drop the table before inserting new values.
append: Insert new values to the existing table.

indexbool, default True

Write DataFrame index as a column. Uses index_label as the column name in the table.

index_labelstr or sequence, default None

Column label for index column(s). If None is given (default) and index is True, then the index names are used. A sequence should be given if the DataFrame uses MultiIndex.

chunksizeint, optional

Specify the number of rows in each batch to be written at a time. By default, all rows will be written at once.

dtypedict or scalar, optional

Specifying the datatype for columns. If a dictionary is used, the keys should be the column names and the values should be the SQLAlchemy types or strings for the sqlite3 legacy mode. If a scalar is provided, it will be applied to all columns.

method{None, ‘multi’, callable}, optional

Controls the SQL insertion clause used:

None : Uses standard SQL INSERT clause (one per row).
‘multi’: Pass multiple values in a single INSERT clause.
callable with signature (pd_table, conn, keys, data_iter).

Details and a sample callable implementation can be found in the section insert method.

New in version 0.24.0.

Raises

ValueError: When the table already exists and if_exists is ‘fail’ (the default).

See also

read_sql: Read a DataFrame from a table.

Notes

Timezone aware datetime columns will be written as Timestamp with timezone type with SQLAlchemy if supported by the database. Otherwise, the datetimes will be stored as timezone unaware timestamps local to the original timezone.

New in version 0.24.0.

References

1: http://docs.sqlalchemy.org
2: https://www.python.org/dev/peps/pep-0249/

Examples

Create an in-memory SQLite database.

>>> from sqlalchemy import create_engine
>>> engine = create_engine('sqlite://', echo=False)

Create a table from scratch with 3 rows.

>>> df = pd.DataFrame({'name' : ['User 1', 'User 2', 'User 3']})
>>> df
     name
0  User 1
1  User 2
2  User 3

>>> df.to_sql('users', con=engine)
>>> engine.execute("SELECT * FROM users").fetchall()
[(0, 'User 1'), (1, 'User 2'), (2, 'User 3')]

>>> df1 = pd.DataFrame({'name' : ['User 4', 'User 5']})
>>> df1.to_sql('users', con=engine, if_exists='append')
>>> engine.execute("SELECT * FROM users").fetchall()
[(0, 'User 1'), (1, 'User 2'), (2, 'User 3'),
 (0, 'User 4'), (1, 'User 5')]

Overwrite the table with just df1.

>>> df1.to_sql('users', con=engine, if_exists='replace',
...            index_label='id')
>>> engine.execute("SELECT * FROM users").fetchall()
[(0, 'User 4'), (1, 'User 5')]

Specify the dtype (especially useful for integers with missing values). Notice that while pandas is forced to store the data as floating point, the database supports nullable integers. When fetching the data with Python, we get back integer scalars.

>>> df = pd.DataFrame({"A": [1, None, 2]})
>>> df
     A
0  1.0
1  NaN
2  2.0

>>> from sqlalchemy.types import Integer
>>> df.to_sql('integers', con=engine, index=False,
...           dtype={"A": Integer()})

>>> engine.execute("SELECT * FROM integers").fetchall()
[(1,), (None,), (2,)]