connect_greenplum

getml.database.connect_greenplum(dbname: str, user: str, password: str, host: str, hostaddr: str, port: int = 5432, time_formats: Optional[List[str]] = None, conn_id: str = 'default')[source]

Creates a new Greenplum database connection.

But first, make sure your database is running and you can reach it from via your command line.

Args:
dbname (str):

The name of the database to which you want to connect.

user (str):

User name with which to log into the Greenplum database.

password (str):

Password with which to log into the Greenplum database.

host (str):

Host of the Greenplum database.

hostaddr (str):

IP address of the Greenplum database.

port(int, optional):

Port of the Greenplum database.

The default port used by Greenplum is 5432.

If you do not know, which port to use, type the following into your Greenplum client:

SELECT setting FROM pg_settings WHERE name = 'port';
time_formats (List[str], optional):

The list of formats tried when parsing time stamps.

The formats are allowed to contain the following special characters:

  • %w - abbreviated weekday (Mon, Tue, …)

  • %W - full weekday (Monday, Tuesday, …)

  • %b - abbreviated month (Jan, Feb, …)

  • %B - full month (January, February, …)

  • %d - zero-padded day of month (01 .. 31)

  • %e - day of month (1 .. 31)

  • %f - space-padded day of month ( 1 .. 31)

  • %m - zero-padded month (01 .. 12)

  • %n - month (1 .. 12)

  • %o - space-padded month ( 1 .. 12)

  • %y - year without century (70)

  • %Y - year with century (1970)

  • %H - hour (00 .. 23)

  • %h - hour (00 .. 12)

  • %a - am/pm

  • %A - AM/PM

  • %M - minute (00 .. 59)

  • %S - second (00 .. 59)

  • %s - seconds and microseconds (equivalent to %S.%F)

  • %i - millisecond (000 .. 999)

  • %c - centisecond (0 .. 9)

  • %F - fractional seconds/microseconds (000000 - 999999)

  • %z - time zone differential in ISO 8601 format (Z or +NN.NN)

  • %Z - time zone differential in RFC format (GMT or +NNNN)

  • %% - percent sign

conn_id (str, optional):

The name to be used to reference the connection. If you do not pass anything, this will create a new default connection.

Note:

By selecting an existing table of your database in from_db() function, you can create a new DataFrame containing all its data. Alternatively you can use the read_db() and read_query() methods to replace the content of the current DataFrame instance or append further rows based on either a table or a specific query.

You can also write your results back into the Greenplum database. By passing the name for the destination table to getml.Pipeline.transform(), the features generated from your raw data will be written back. Passing them into getml.Pipeline.predict(), instead, makes predictions of the target variables to new, unseen data and stores the result into the corresponding table.