SimpleSQLite 0.37.0

SimpleSQLite is a Python library to simplify SQLite database operations: table creation, data insertion and get data as other data formats. Simple ORM functionality for SQLite.

SimpleSQLite

• Summary

  • Features

• Examples

  • Create a table

  • Insert records into a table

  • Fetch data from a table as pandas DataFrame

  • ORM functionality

  • For more information

• Installation

• Dependencies

  • Mandatory Dependencies

  • Optional Dependencies

  • Test Dependencies

• Documentation

• Related Project

Summary

SimpleSQLite is a Python library to simplify SQLite database operations: table creation, data insertion and get data as other data formats. Simple ORM functionality for SQLite.

Features

• Automated SQLite table creation from data

• Support various data types of record(s) insertion into a table:

  • dict

  • namedtuple

  • list

  • tuple

• Create table(s) from:

  • CSV file/text

  • JSON file/text

  • pandas.DataFrame instance

  • tabledata.TableData instance loaded by pytablereader

• Get data from a table as:

  • pandas.DataFrame instance

  • tabledata.TableData instance

• Simple object-relational mapping (ORM) functionality

Examples

Create a table

Create a table from data matrix

Sample Code:

from simplesqlite import SimpleSQLite


table_name = "sample_table"
con = SimpleSQLite("sample.sqlite", "w")

# create table -----
data_matrix = [[1, 1.1, "aaa", 1, 1], [2, 2.2, "bbb", 2.2, 2.2], [3, 3.3, "ccc", 3, "ccc"]]
con.create_table_from_data_matrix(
    table_name,
    ["attr_a", "attr_b", "attr_c", "attr_d", "attr_e"],
    data_matrix,
)

# display data type for each column in the table -----
print(con.schema_extractor.fetch_table_schema(table_name).dumps())

# display values in the table -----
print("records:")
result = con.select(select="*", table_name=table_name)
for record in result.fetchall():
    print(record)

Output:

.. table:: sample_table

    +---------+-------+-----------+--------+------+-----+
    |Attribute| Type  |PRIMARY KEY|NOT NULL|UNIQUE|Index|
    +=========+=======+===========+========+======+=====+
    |attr_a   |INTEGER|           |        |      |     |
    +---------+-------+-----------+--------+------+-----+
    |attr_b   |REAL   |           |        |      |     |
    +---------+-------+-----------+--------+------+-----+
    |attr_c   |TEXT   |           |        |      |     |
    +---------+-------+-----------+--------+------+-----+
    |attr_d   |REAL   |           |        |      |     |
    +---------+-------+-----------+--------+------+-----+
    |attr_e   |TEXT   |           |        |      |     |
    +---------+-------+-----------+--------+------+-----+


records:
(1, 1.1, 'aaa', 1.0, '1')
(2, 2.2, 'bbb', 2.2, '2.2')
(3, 3.3, 'ccc', 3.0, 'ccc')

Create a table from CSV

Sample Code:

from simplesqlite import SimpleSQLite

with open("sample_data.csv", "w") as f:
    f.write("\n".join([
        '"attr_a","attr_b","attr_c"',
        '1,4,"a"',
        '2,2.1,"bb"',
        '3,120.9,"ccc"',
    ]))

# create table ---
con = SimpleSQLite("sample.sqlite", "w")
con.create_table_from_csv("sample_data.csv")

# output ---
table_name = "sample_data"
print(con.fetch_attr_names(table_name))
result = con.select(select="*", table_name=table_name)
for record in result.fetchall():
    print(record)

Output:

['attr_a', 'attr_b', 'attr_c']
(1, 4.0, u'a')
(2, 2.1, u'bb')
(3, 120.9, u'ccc')

Create a table from pandas.DataFrame

Sample Code:

from simplesqlite import SimpleSQLite
import pandas

con = SimpleSQLite("pandas_df.sqlite")

con.create_table_from_dataframe(pandas.DataFrame(
    [
        [0, 0.1, "a"],
        [1, 1.1, "bb"],
        [2, 2.2, "ccc"],
    ],
    columns=['id', 'value', 'name']
), table_name="pandas_df")

Output:

$ sqlite3 pandas_df.sqlite
sqlite> .schema
CREATE TABLE 'pandas_df' (id INTEGER, value REAL, name TEXT);

Insert records into a table

Insert dictionary

Sample Code:

from simplesqlite import SimpleSQLite

table_name = "sample_table"
con = SimpleSQLite("sample.sqlite", "w")
con.create_table_from_data_matrix(
    table_name,
    ["attr_a", "attr_b", "attr_c", "attr_d", "attr_e"],
    [[1, 1.1, "aaa", 1,   1]])

con.insert(
    table_name,
    record={
        "attr_a": 4,
        "attr_b": 4.4,
        "attr_c": "ddd",
        "attr_d": 4.44,
        "attr_e": "hoge",
    })
con.insert_many(
    table_name,
    records=[
        {
            "attr_a": 5,
            "attr_b": 5.5,
            "attr_c": "eee",
            "attr_d": 5.55,
            "attr_e": "foo",
        },
        {
            "attr_a": 6,
            "attr_c": "fff",
        },
    ])

result = con.select(select="*", table_name=table_name)
for record in result.fetchall():
    print(record)

Output:

(1, 1.1, 'aaa', 1, 1)
(4, 4.4, 'ddd', 4.44, 'hoge')
(5, 5.5, 'eee', 5.55, 'foo')
(6, None, 'fff', None, None)

Insert list/tuple/namedtuple

Sample Code:

from collections import namedtuple
from simplesqlite import SimpleSQLite

table_name = "sample_table"
con = SimpleSQLite("sample.sqlite", "w")
con.create_table_from_data_matrix(
    table_name,
    ["attr_a", "attr_b", "attr_c", "attr_d", "attr_e"],
    [[1, 1.1, "aaa", 1, 1]],
)

# insert namedtuple
SampleTuple = namedtuple("SampleTuple", "attr_a attr_b attr_c attr_d attr_e")

con.insert(table_name, record=[7, 7.7, "fff", 7.77, "bar"])
con.insert_many(
    table_name,
    records=[(8, 8.8, "ggg", 8.88, "foobar"), SampleTuple(9, 9.9, "ggg", 9.99, "hogehoge")],
)

# print
result = con.select(select="*", table_name=table_name)
for record in result.fetchall():
    print(record)

Output:

(1, 1.1, 'aaa', 1, 1)
(7, 7.7, 'fff', 7.77, 'bar')
(8, 8.8, 'ggg', 8.88, 'foobar')
(9, 9.9, 'ggg', 9.99, 'hogehoge')

Fetch data from a table as pandas DataFrame

Sample Code:

from simplesqlite import SimpleSQLite

con = SimpleSQLite("sample.sqlite", "w", profile=True)

con.create_table_from_data_matrix(
    "sample_table",
    ["a", "b", "c", "d", "e"],
    [
        [1, 1.1, "aaa", 1,   1],
        [2, 2.2, "bbb", 2.2, 2.2],
        [3, 3.3, "ccc", 3,   "ccc"],
    ])

print(con.select_as_dataframe(table_name="sample_table"))

Output:

$ sample/select_as_dataframe.py
   a    b    c    d    e
0  1  1.1  aaa  1.0    1
1  2  2.2  bbb  2.2  2.2
2  3  3.3  ccc  3.0  ccc

ORM functionality

Sample Code:

from simplesqlite import connect_memdb
from simplesqlite.model import Integer, Model, Real, Text


class Sample(Model):
    foo_id = Integer(primary_key=True)
    name = Text(not_null=True, unique=True)
    value = Real()


def main():
    con = connect_memdb()

    Sample.attach(con)
    Sample.create()
    Sample.insert(Sample(name="abc", value=0.1))
    Sample.insert(Sample(name="xyz", value=1.11))
    Sample.insert(Sample(name="bar", value=2.22))

    print(Sample.fetch_schema().dumps())
    print("records:")
    for record in Sample.select():
        print("    {}".format(record))

    return 0


if __name__ == "__main__":
    sys.exit(main())

Output:

.. table:: sample

    +---------+-------+-----------+--------+------+-----+
    |Attribute| Type  |PRIMARY KEY|NOT NULL|UNIQUE|Index|
    +=========+=======+===========+========+======+=====+
    |foo_id   |INTEGER|X          |        |      |     |
    +---------+-------+-----------+--------+------+-----+
    |name     |TEXT   |           |X       |X     |     |
    +---------+-------+-----------+--------+------+-----+
    |value    |REAL   |           |        |      |     |
    +---------+-------+-----------+--------+------+-----+


records:
    Sample: foo_id=1, name=abc, value=0.1
    Sample: foo_id=2, name=xyz, value=1.11
    Sample: foo_id=3, name=bar, value=2.22

For more information

More examples are available at https://simplesqlite.rtfd.io/en/latest/pages/examples/index.html

Installation

pip install SimpleSQLite

Dependencies

Python 2.7+ or 3.4+

Mandatory Dependencies

• DataProperty (Used to extract data types)

• mbstrdecoder

• pathvalidate

• six

• sqliteschema

• tabledata

• typepy

Optional Dependencies

• logbook

  • Logging using logbook if the package installed

• pandas

• pytablereader

Test Dependencies

• pytest

• pytest-runner

• tox

Documentation

https://simplesqlite.rtfd.io/

Related Project

• sqlitebiter: CLI tool to convert CSV/Excel/HTML/JSON/LTSV/Markdown/TSV/Google-Sheets SQLite database by using SimpleSQLite