https://plus.hutool.cn/apidocs/cn/hutool/db/package-tree.html
cn.hutool.db Class Hierarchy (hutool 5.8.47 API)
db classhierarchyapi
https://openacs.org/xotcl/show-object?show_methods=0&show_variables=1&show_source=0&object=::acs::db::nsdb
::nx::Class ::acs::db::nsdb
classacs
https://www.playframework.com/documentation/2.8.0-M6/api/java/play/db/package-tree.html
play.db Class Hierarchy (Play 2.8.0-M6)
db classplayhierarchy
https://www.playframework.com/documentation/2.9.8/api/java/play/db/package-tree.html
play.db Class Hierarchy (Play 2.9.8)
db classplayhierarchy
https://chemical.ushazmatrentals.com/hazard-classes/flammable-gases/
Flammable Gas (Class 2.1) Storage | Chemical DB | US Hazmat Rentals Chemical DB
Flammable gases ignite easily in air and need ignition control, ventilation, and fire-rated or appropriately classified storage when quantities and codes...
flammablegasclassstoragechemical
https://docs.fd.io/vpp/18.10/d9/d41/class_v_o_m_1_1client__db.html
FD.io VPP: VOM::client_db Class Reference
db classvppvomclientreference