A low-memory json-based database for MicroPython. Data is stored in a folder structure in json for easy inspection.
Install prerequisites:
micropython -m upip install micropython-os
micropython -m upip install micropython-os.path
or
>>> import upip
>>> upip.install("micropython-os”)
>>> upip.install("micropython-os.path”)
Usage instructions :
import micropydatabase
Create a new database:
db_object = micropydatabase.Database.create("mydb")
Open an existing database:
db_object = micropydatabase.Database.open("mydb")
Create a new table (specifying column names [and types if you need it]):
(Table column definition supported types are str, int and bool. Default is str.)
db_object = micropydatabase.Database.open("mydb")
db_object.create_table("mytable", ["name", "password"])
db_object.create_table("mytable", {
"name":str,
"age":int,
"isMember":bool
})
Insert data into table:
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
db_table.insert({"name": "lucy", "password": "coolpassword"}) # as dict
db_table.insert(["Rose", "MySecret"]) # as list
Multi-insert data into table:
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
db_table.insert([
{"name": "john", "password": "apassword"},
{"name": "john", "password": "apassword"},
{"name": "bob", "password": "thispassword"},
{"name": "sally", "password": "anotherpassword"}
])
Find (returns first result):
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
db_table.find({"name": "john", "password": "apassword"})
Query (returns all results):
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
db_table.query({"name": "john", "password": "apassword"})
Update Row (search query, updated row data):
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
db_table.update(
{"name": "bob", "password": "thispassword"}, #find what
{"name": "george", "password": "somethingelse"} # change with
)
Delete Row:
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
db_table.delete({"name": "george", "password": "somethingelse"})
Scan (iterate through each row in table):
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
f = db_table.scan()
f.__next__()
Scan with Query (iterate through rows that match query):
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
f = db_table.scan({"name": "john", "password": "apassword"})
f.__next__()
Truncate Table (delete all table contents):
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
db_table.truncate()
Vaccum Table (reorganize all content):
db_object = micropydatabase.Database.open("mydb")
db_table = db_object.open_table("mytable")
db_table.vaccum()
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