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store numpy array in database

By Cook's Tree BoaCook's Tree Boa on Nov 17, 2019 
cur.execute("select arr from test")
data = cur.fetchone()[0]

print(data)
# [[ 0  1  2  3  4  5]
#  [ 6  7  8  9 10 11]]
print(type(data))
# <type 'numpy.ndarray'>

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store numpy array in database

By Cook's Tree BoaCook's Tree Boa on Nov 17, 2019 
cur.execute("insert into test (arr) values (?)", (x, ))

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store numpy array in database

By Cook's Tree BoaCook's Tree Boa on Nov 17, 2019 
import sqlite3
import numpy as np
import io

def adapt_array(arr):
    """
    http://stackoverflow.com/a/31312102/190597 (SoulNibbler)
    """
    out = io.BytesIO()
    np.save(out, arr)
    out.seek(0)
    return sqlite3.Binary(out.read())

def convert_array(text):
    out = io.BytesIO(text)
    out.seek(0)
    return np.load(out)


# Converts np.array to TEXT when inserting
sqlite3.register_adapter(np.ndarray, adapt_array)

# Converts TEXT to np.array when selecting
sqlite3.register_converter("array", convert_array)

x = np.arange(12).reshape(2,6)

con = sqlite3.connect(":memory:", detect_types=sqlite3.PARSE_DECLTYPES)
cur = con.cursor()
cur.execute("create table test (arr array)")

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