# Functions

CloseDB closes database connection pool before exiting the main function.
GetDumpDB is used in test.
GetMysqlDB singleton implementation makes sure only one mysqlDB is created to avoid duplicated database connection pools.
GetPostgresDB singleton implementation makes sure only one postgresDB is created to avoid duplicated database connection pools.
GetProvider singleton implementation makes sure only one Provider is created to avoid duplicated database connection pools.

# Interfaces

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