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Google apps script database abstraction exposed version

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Google apps script database abstraction exposed version

  1. 1. Database abstraction – GoogleApps Script Desktop liberation
  2. 2. Google Apps Script libraries providing a noSQL API for a variety of backends Provides reusability and transportability of code between databases, and simplified migration between them SimpleAPI to learn, with the most common capabilities exposed and standardized A consistent results structure Locking, backing off , caching, authentication and limits handled transparently
  3. 3. With dbAbstraction, noSQL queries are the same for all supported backend stores. So far this includes scriptdb Parse.com Fusion Orchestrate.io Fusion Sheets Import.io (readonly) Drive Properties DataStore MongoDB
  4. 4. A web app that exposes the GAS dbab as a JSON rest API Handles POST and GET queries, updates, inserts, gets, count and removes Exposes all dbab capabilities Oauth2 is mandatory to authenticate to the webapp Authentication credentials for backend databases are securely stored in your copy of its property store
  5. 5. cDataHandler library cEzyOauth2 library cCacheHandler library Dbab webapp App template Your property store Backend driver Backend database cFlattener library noSQL queries Access token Google oauth2 infrastructure Query caching cNamedLock library Transaction locking JSON API Query translation authentication Cloud credentials Access & refresh tokens (un)Flatten objects Your client Oauth2 authentication JSON REST API
  6. 6. You authenticate to dbab via oAuth2 using Drive scope Your published copy of dbab webapp already has your various authentication properties built in for your supported databases If the backend database needs oauth2, that’s also handled by the dbab JSON api
  7. 7. It’s a REST API that returns either JSON or JSONP. GET or POST is supported for all actions. action=query|remove|save|update|get query= some noSQL query, the same syntax as the regular GAS API params = some params (skip|limit|sort) as the regular GAS API driver=scriptdb|mongolab|sheet|drive|orchestrate|parse|datastore |fusion (any exposed backend) nocache=0|1 (use cache/don’t) siloid= roughly equivalent to a table name dbid = roughly equivalent to a database name driverid=0|1 (whether to include driver generated ids in response) callback=some callback – ask for jsonp rather than json
  8. 8. Same format as the GAS API { handleCode: 0, // +ve number= good, -ve bad handleError:’’, //’some text about an error’ data:[], // the results driverIds:[], // if asked for, any keys the driver generates automatically handlerIds:[] // if asked for, the key the driver considers to be the unique key for each data item + various other informational properties about handler version etc… }
  9. 9. Now it’s simple to write an API for another language that looks like the standard GASAPI GAS dbab handles the translation to various backends, with new features and new supported drivers immediately available Your API just needs to know how to talk to the GAS dbab JSONAPI You can centralize your various credentials in the cloud, protected by oauth2 Your code can look very similar to the same code using the GAS API directly (language syntax constraints aside)
  10. 10. • Gets handler, creates nosql directives, deals with responsesVBA application • Deals with oauth2 authentication to your web app. Translates directives to JSON API requests and handles responses VBA API • Deals with requests and responses Dbab GAS REST API • deals with authentication credentials, caching. Gets handler and interprets nosql queriesDbab GAS API • Translates nosql queries to backend syntax and handles, authentication, locking, responses and requestsDbab GAS driver • Handles queries and returns data and responses to its driverVarious backends
  11. 11. Oauth2 integration withVBA is covered elsewhere in detail Create an application in Google Cloud Console If usingVBA  Do a one off registration to yourWindows registry  From now on you can simply do this to get authorized Set oauth2 = getGoogled("drive")
  12. 12. Copy from this template Add any credentials needed for any backend as described here Save a version and publish as a webapp – (set to run as “user accessing the webapp”) Take a note of the webapp URL Run doGet to authorize it If needed, run the web app once with ?driver=datastore to provoke setting up of the refresh token structure
  13. 13. Do any setup needed to create your databases or sheets you are using as a backend You can now access your webapp as a REST API to talk to the supported backends If you want to use theVBA API, continue to step 4
  14. 14. Get emptycdataset.xlsm from desktop liberation downloads Set up your handler and web app URL Set handler = New cDbAb handler.setOauth2(oauth2).setEndPoint (_ "https://script.google.com/macros/s/xxxxxx/exec") Set up your database type name, database and data silo handler.setDbName("sheet") _ .setDbId(“xxxx") _ .setSiloId(“yyyy”) You can start…
  15. 15. I’ve tried to keep theVBA syntax is as close to original Google Apps Script as possible within the limitations of the language. VBA has no native JavaScript like objects or JSON, but I use cJobject throughout The cJobject JSON parser allows both single and double quotes to be used in JSON eg. {‘name’:’ethel’} can be used so it can more be easily represented as aVBA string “{‘name’:’ethel’}” cDataset can be used to write and read excel workbooks to and from JSON
  16. 16. Code What it does Set result = handler.remove() Removes everything from the handler’s silo Set result = handler.save(testData) Saves data in the given cJObject.You can easily create a cJobject from an Excel sheet like this Set ds = New cDataSet Set testData = ds.load("dbab").jObject(, , , , "data") Set result = handler.query() Get everything in the handler’s silo Set result = handler.query(, "{'limit':2}") Get the first 2 objects. Note that both single quotes and double quotes are allowed by this JSONParser to make it easier to enter JSON as aVBA string Set result = handler.query(, "{'sort':'-name'}") Get everything in the handler’s silo, sorted in reverse order using the property ‘name’
  17. 17. Code What it does Set result = handler.query(, "{'sort':'- name','skip':3}") Sort by name and skip the first 3 Set result = handler.query("{'name':'ethel'}") Select all objects whose name is ‘ethel’ Set result = handler.query( ("{'stuff':{'sex':'female'}}") Select all objects where stuff.sex = ‘female’ Set result = handler.query( ("{'stuff.sex':'female'}") Same as above. Note that you can use either deep or flattened objects for both data and queries. Regardless of how the driver has to store the data (for example two dimensional backends like sheets need to store flattened data), the result of the query will be natural, unflattened objects
  18. 18. Code What it does Set result = handler.query("{'stuff.sex':'male'}", , 1, 1) Select all objects where name is john or mary and stuff.sex is male, don’t use cache, and return the unique keys recognized by the driver for each object as well handler.update(result.handleKeys, data) Replace all the objects with the keys returned from the previous query with new data handler.remove("{'stuff.sex':'male'}") Remove all the objects where stuff.sex is male Set r2 = handler.getObjects(result.handleKeys) Get all the objects whose keys were returned by a previous query
  19. 19. Code What it does Set result = handler.query("{'name':" & handler.constraints("[['IN',['ethel','fred']]]") & "}" Note that queries other than equality, need constraints. Unfortunately the syntax is a bit fiddly to construct as aVBA string.The function handler.constraints() converts your query into consumable syntax for the API. This query selects all objects whose name is in the given list handler.query("{'stuff.age':" & handler.constraints("[['GT',25],['LTE',60]]") & "}") Select all objects where stuff.age > 25 and <= 60 handler.query("{'stuff':{'age':" & handler.constraints("[['GT',25]]") & "}}") Select all objects where stuff.age > 25 "{'stuff':{'sex':'male', 'age':" & handler.constraints("[['GTE',25],['LT',60]]") & "}}" Select all objects where stuff.sex = ‘male’ and age is >= 25 and < 60
  20. 20. Code What it does handler.query( "{'name':" & handler.constraints("[['IN',['john','mary']]]") & ",'stuff.sex':'male','stuff.age':" & handler.constraints("[['GT',25]]") & "}" Select all objects where name is john or mary and stuff.sex is male and stuff,age > 25 handler.query("{'stuff.age':" & handler.constraints("[['GT',25],['LTE',60]]") & "}") Select all objects where stuff.age > 25 and <= 60 handler.query( "{'stuff.age':" & handler.constraints("[['GT',25]]") & "}", "{'limit':1}“) Select the first object where stuff.age > 25 handler.query( "{'stuff':{'sex':'male', 'age':" & handler.constraints("[['GTE',25],['LT',60]]") & "}}“) Select all objects where stuff.sex = ‘male’ and age is >= 25 and < 60
  21. 21. It’s simple to copy the database contents to a worksheet Do a query Construct a sheet Set result = handler.query() Set ds = makeSheetFromJob(result.data, “yoursheetname”) Since an excel sheet is two dimensional, any deep objects will be flattened to dot syntax so they can be represented as an excel table
  22. 22. It’s simple to copy the worksheet contents to a database Load the sheet and convert it to JSON Save to your selected back end Set testData = ds.load(“yoursheetname”).jObject(, , , , "data") Set result = handler.save(testData) Any flattened objects will be automatically converted back to deep objects
  23. 23. Read about Google Apps Script data abstraction here. Read about the dbab JSONAPI here Read about theVBA API client here. Read about ezyOauth2 here. Contact me on google plus or at my forum and share with others how you are using this API Join the Google Apps Script Community

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