Persist

Persist allows to store data for use in other messages/transactions. Use cases:

• store data from an incoming order, and use the data later for DESADV and/or INVOIC. Often the buyer want you to return data in the orders that are hard to store in your internal system.
• is used in plugin alto_seperate_headers_details: input: 2 csv files, one with headers, one with details lines. This is processed into one document (so the headers and details are merged) using persist.

Details: - persist data is store in the bots database. - You can store and retrieve 'any' python data (python pickle is used). - bots < 3.0: storage size (per item) is limited to 1024 positions; bots >= 3.0: unlimited. - Parameter 'maxdayspersist' in bots.ini controls how long the values are kept in bots. This is done using a timestamp for the persisted data. However, the timestamp is not updated if you update the information in the persist database. This can be done via a database trigger. In bots 3.2.0 and later the SQLite database includes this trigger (might be somewhat SQLite specific):

    CREATE TRIGGER persist_update AFTER UPDATE OF content ON persist 
    BEGIN 
        UPDATE persist SET ts = datetime('now','localtime') 
        WHERE domein = new.domein and botskey = new.botskey ; 
    END

Example

You receive orders from buyer 'XXX'. In the order they have a 'reference number' that has to be returned in ASN's and invoices.

#in the order:
buyerID = inn.ta_info['frompartner']
po_number = inn.get({'BOTSID':'ST'},{'BOTSID':'BEG','BEG03':None})
ref_number = inn.get({'BOTSID':'ST'}{'BOTSID':'REF','REF01':'IP','REF02':None})
transform.persist_add(buyerID, po_number, ref_number)
#now this referenced number is in persist; domain is the buyerID, key is the po_number (that will be return eg in invoice)

#in the invoice find the domain and key:
buyerID = inn.ta_info['frompartner']     #via QUERIES in invoice in-house grammar
po_number = inn.get({'BOTSID':'HEADER','PO_NUMBER':None})
#fetch reference number from persist:
ref_number = transform.persist_lookup(buyerID, po_number)

functions

transform.persist_add(domain, key, value)
Add value to persist.
If not possible, eg. because domain-key exists already, botslib.PersistError is raised.

transform.persist_update(domain, key, value)
Update the value.
If domain-key does not exist: does not add it, gives no error.

transform.persist_add_update(domain, key, value)
add, but if domain-key already exist: update.

transform.persist_lookup(domain, key)
returns value.
if domain-key does not exist: returns None

transform.persist_delete(domain, key)
deletes value.
if domain-key does not exits: gives no error.