put configuration in HUE as below:

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[librdbms]
 # The RDBMS app can have any number of databases configured in the databases
 # section. A database is known by its section name
 # (IE sqlite, mysql, psql, and oracle in the list below).

 `databases`
   # sqlite configuration.
   ## [`sqlite`]
     # Name to show in the UI.
    ## nice_name=SQLite

     # For SQLite, name defines the path to the database.
     #name=/tmp/sqlite.db

     # Database backend to use.
     #engine=sqlite

     # Database options to send to the server when connecting.
     # https://docs.djangoproject.com/en/1.4/ref/databases/
     ## options={}

   # mysql, oracle, or postgresql configuration.
   [`mysql`]
     # Name to show in the UI.
     nice_name="My SQL DB"

     # For MySQL and PostgreSQL, name is the name of the database.
     # For Oracle, Name is instance of the Oracle server. For express edition
     # this is 'xe' by default.
     name=dbname

     # Database backend to use. This can be:
     # 1. mysql
     # 2. postgresql
     # 3. oracle
     engine=mysql

     # IP or hostname of the database to connect to.
     host=mysql-server-ip

     # Port the database server is listening to. Defaults are:
     # 1. MySQL: 3306
     # 2. PostgreSQL: 5432
     # 3. Oracle Express Edition: 1521
     ## port=3306

     # Username to authenticate with when connecting to the database.
     user=username

     # Password matching the username to authenticate with when
     # connecting to the database.
     password=password

     # Database options to send to the server when connecting.
     # https://docs.djangoproject.com/en/1.4/ref/databases/
     ## options={}

restart HUE service

ok

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