Remove duplicate code snippets from device-mgt DAO layer
Description
Most of the methods that can be abstracted are been duplicated between different data sources.
Suggested Labels:
Carbon Device-mgt core, DAO layer
Suggested Assignees:
Affected Product Version:
IoT server 3.8.2
OS, DB, other environment details and versions:
Data sources - MySQL , MsSQL, OracleSQl, PostgreSQL
Steps to reproduce:
Not related