With series of asynchronous callbacks, debugging IndexedDB or WebSQL is hard. We have dedicated nearly 50% of the source codes for debug information. These debug information are stripped on production version. To get these information, you can either use raw version or dev version. Dev version file is postfixed with -dev. Raw version file is postfixed with -raw. If you use dev version, you should turn on source map to get raw source codes, instead of minified one.

Use build-in logging facility to detail logging.

var module = 'ydn.db';
var level = 'finer'; // warning, info, fine, finest, all
ydn.debug.log(module, level);

For more detail, see closure library debugging facility.

Example output will be

[6.164s] [ydn.db.tr.Serial] B0T2 complete              
[6.164s] [ydn.db.tr.Serial] B0T3 BEGIN ["mashCacheAge"] readonly 
[6.165s] [ydn.db.Request] Request:sql[B0T3R2*] BEGIN    
[6.165s] [ydn.db.sql.req.nosql.Node] sql[B0T3R2*] executing onmashCacheAge:id [MashupExamples_example3items, MashupExamples_example3items]                                 
[6.165s] [ydn.db.sql.req.IndexedDb] sql[B0T3R2*] 4 mashCacheAge{"upperOpen":false,"lowerOpen":false "upper":"MashupExamples_example3items","lower":"MashupExamples_example3items"}
[6.166s] [ydn.db.Request] Request:sql[B0T3R2*] END
[6.166s] [ydn.db.Request] Request:sql[B0T3R2*] SUCCESS

Notice that transaction and database request print out their sequence number, eg: B0T3R2. Where B stand for branch number, T stands for transaction number, which is increased by one for each transaction created on the branch and R stands for request number, which is increased by one for each request on the transaction. * indicate transaction is active at the time out logging.