teocns / simple-dynamodb

Abstraction of DynamoDB boto3 client.

The following client is used mainly in DynamoDB Lambda triggers to process and aggregate data.

Example run:

from SimpleDyDb.UpdateItemInstructions import UpdateItemsInstructions
from SimpleDyDb.helpers import subtract_keys_to_dict
from SimpleDyDb.api import update_item
import boto3



updates={
	"my_increment_variable": [0,1] ,   # my_increment_variable = if_not_exists(my_increment_variable,0) + 1
	"only_if_not_exists": ["alpha"] ,  # only_if_not_exists = if_not_exists(only_if_not_exists,alpha)
	"assigned_variable": "ciao" ,      # assigned_variable = ciao
	"appendable": [[1]] ,              # appendable = list_append(if_not_exists(appendable,[]), [1])
}

deletes=[
	"attr1",
	"attr2",
]

condition = "#asd = :asd" 
condition = "#asdddsad = :132"
key = {
    "yyyy-mm-dd": "asd",
    "user_id": "asd"
}
update_item(
    boto3.resource('dynamodb').Table('yourtable'),
    update_instructions= UpdateItemsInstructions(
        updates,
        deletes,
        key,
        condition
    ),
)