The tag of the database. You should set it on a WCTDatabase and can get it from all kind of WCTCore objects, including WCTDatabase, WCTTable, WCTransaction, WCTSelect, WCTRowSelect, WCTMultiSelect, WCTInsert, WCTDelete, WCTUpdate and so on. Note that WCTCore objects with same path share this tag, even they are not the same object.

 WCTDatabase* database1 = [[WCTDatabase alloc] initWithPath:path];
 WCTDatabase* database2 = [[WCTDatabase alloc] initWithPath:path];
 database1.tag = 1;
 NSLog(@"%d", database2.tag);//print 1

The path of the database