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Google cloud datastore driver for Google Apps Script DB abstraction


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This is the Google Cloud Datastore driver for Apps Script. Gives a standard query and database update interface to multiple back end databases

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Google cloud datastore driver for Google Apps Script DB abstraction

  1. 1. Database abstraction – GoogleApps Script Desktop liberation
  2. 2. A massively scalable cloud based datastore Usually used along with Google App Engine APIs available for Python, Go, Java, Php A JSONAPI exists Has an SQL like query language (GQL) GQL is query only Only really supports flat level objects Free daily quota can be eaten up fairly quickly Many capabilities, fairly complex It’s a database Jim, but not as we know it
  3. 3. There is no API for Google Apps Script Have to use the JSON API, which is complex and limited Complex queries need pre-specified indexes It’s conceptually different to normal databases and structures Oauth2 is mandatory Database abstraction aims to simplify all that
  4. 4. With dbAbstraction, DataStore noSQL queries are the same for all supported backends. So far this includes Scriptdb Fusion Fusion Sheets Drive Properties DataStore
  5. 5. Your Script cDataHandler library cEzyOauth2 library cCacheHandler library Your webapp App template Your property store cDataStore driver Cloud DataStore 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
  6. 6. The same as other database backends up to the driver Caching, locking and oAuth2 built in Complex objects supported through flattening with dot syntax Complex queries handled by DataStore when index exists Non indexed queries automatically handled by driver filtering
  7. 7. handler.query ( ); handler.query ({sex:”male”} ); handler.query ({sex:”male”,country:”USA”} ); handler.query ({sex:”male”,network:{google:{usage:”seldom”}}}); Handler.query({sex:”male”,””:”seldom”}); Handler.query({sex:”female”,handler.constraint([[c.GT,50],[c.LT,6 0]])}); Handler.query({},{limit:20,sort:”-age”}); Handler.query({sex:”female”, age:handler.constraint([[c.GT,50],[c.LT,60]] , name:handler.constraint([[c.IN,[”smith”,”jones”]] )}, {sort:””}); handler.count ({sex:”male”} );
  8. 8. handler.remove ( ); handler.remove ({sex:”male”} ); handler.remove({query ({sex:”male”,country:”USA”} ); handler.remove({sex:”male”,network:{google:{usage:”seldo m”}}}); Handler.remove({sex:”male”,””:”seld om”}); Handler.remove({sex:”female”,handler.constraint([[c.GT,50] ,[c.LT,60]])}); Handler.remove({},{limit:20,sort:”-age”});
  9. 9.{name:”john”,age:25,country:”USA”,network:{ google:”seldom”,facebook:”often”}} );[{name:”john”,age:25,country:”USA”,network: {google:”seldom”,facebook:”often”}}, name:”mary”,age:28,country:”UK”,network:{google:”ofte n”,facebook:”never”}}]);
  10. 10. var result = handler.query ({”seldom”},undefined,1, true ); { = true; }); handler.update (result.handleKeys,; var result = handler.query ({”often”},{sort:”age”,limit:10},1, true); { = true; }); handler.update (result.handleKeys,;
  11. 11. var resultFromCache = handler.query ({”seldom”}); var resultNoCache = handler.query ({”seldom”,undefined, 1});
  12. 12. A standard recipe function doGet (e) { return doGetPattern(e, constructConsentScreen, doSomething, 'googleDatastore') ; } 1. The name of a function that returns an html string with a user consent dialog. Will only get called the first time doGet() is run to kick off the self maintaining access/refresh token details 2. The name of a function that does what your doGet() would normally do, and returns what it would normally return 3. A unique name against which to store the access/refresh token details in the property store 1 2 3
  13. 13. Your datastore credentials and scopes should be stored in your properties store EzyOauth2 will update your credentials object with refresh and access token information Every time after the first time run, your access token will be refreshed automatically when necessary Functions are provided in the pattern for your function to read and write properties, but the libraries never access your properties directly.
  14. 14. The ongoing pattern is more or less the same for both webapp and non-webapp doGet() needs to be run at least once to provoke an authorization dialog Non- webapps need a doGet() function run just once to get the refresh token infrastructure set up.You can delete the doGet() function after that.
  15. 15. Code is in the Patterns example, and looks like this. Substitute your own credentials and run function oneTimeSetProperties () { setAuthenticationPackage_ ({ clientId : “", clientSecret : “xxx", scopes : ['',' uth/'], service: 'google', packageName: 'googleDatastore' }); }
  16. 16. Substitute your credentials and run this , one time function oneTimeSetProperties () { setAuthenticationPackage_ ({ clientId : “", clientSecret : “xxx", scopes : ['',' service: 'google', packageName: 'googleDatastore' }); } This will get created
  17. 17. library key comments cDataHandler Mj61W- 201_t_zC9fJg1IzYiz3TLx7pV4j Abstracted interface to back end databases, and all known drivers cCacheHandler MXhfe1Z1GKU-_Qnd94LqcsKi_d- phDA33 Manages caching of query results cNamedLock MBaYiatjgCSvDcsG6fHIFsyz3TLx7p V4j Cross script locking of abstract resources cEzyOauth2 MSaYlTXSVk7FAqpHNCcqBv6i_d- phDA33 Manages oAuth2 credentials and offline refreshing of access tokens cFlatten MqxKdBrlw18FDd- X5zQLd7yz3TLx7pV4j Flattens complex objects to 1 level dot syntax objects so they can be stored/queries in a 2 dimensional space ezyOauth2 templates OZL5YODaj71l0- XSaD0BBciG_zIV2I0Neu3Nz1LaKY6 -4WiJAt/edit?usp=sharing Patterns for web and nonweb apps for easy oath2 authentication.Take a copy of this
  18. 18. Read about data abstraction using the datastore here. Read about ezyOauth2 here. Contact me on google plus or at my forum Join the Google Apps Script Community