Source code for airflow.providers.mysql.transfers.presto_to_mysql

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from typing import Dict, Optional

from airflow.models import BaseOperator
from airflow.providers.mysql.hooks.mysql import MySqlHook
from airflow.providers.presto.hooks.presto import PrestoHook


[docs]class PrestoToMySqlOperator(BaseOperator):
    """
    Moves data from Presto to MySQL, note that for now the data is loaded
    into memory before being pushed to MySQL, so this operator should
    be used for smallish amount of data.

    :param sql: SQL query to execute against Presto. (templated)
    :type sql: str
    :param mysql_table: target MySQL table, use dot notation to target a
        specific database. (templated)
    :type mysql_table: str
    :param mysql_conn_id: Reference to :ref:`mysql connection id <howto/connection:mysql>`.
    :type mysql_conn_id: str
    :param presto_conn_id: source presto connection
    :type presto_conn_id: str
    :param mysql_preoperator: sql statement to run against mysql prior to
        import, typically use to truncate of delete in place
        of the data coming in, allowing the task to be idempotent (running
        the task twice won't double load data). (templated)
    :type mysql_preoperator: str
    """

[docs]    template_fields = ('sql', 'mysql_table', 'mysql_preoperator')
[docs]    template_ext = ('.sql',)
[docs]    template_fields_renderers = {"mysql_preoperator": "sql"}
[docs]    ui_color = '#a0e08c'

    def __init__(
        self,
        *,
        sql: str,
        mysql_table: str,
        presto_conn_id: str = 'presto_default',
        mysql_conn_id: str = 'mysql_default',
        mysql_preoperator: Optional[str] = None,
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        self.sql = sql
        self.mysql_table = mysql_table
        self.mysql_conn_id = mysql_conn_id
        self.mysql_preoperator = mysql_preoperator
        self.presto_conn_id = presto_conn_id

[docs]    def execute(self, context: Dict) -> None:
        presto = PrestoHook(presto_conn_id=self.presto_conn_id)
        self.log.info("Extracting data from Presto: %s", self.sql)
        results = presto.get_records(self.sql)

        mysql = MySqlHook(mysql_conn_id=self.mysql_conn_id)
        if self.mysql_preoperator:
            self.log.info("Running MySQL preoperator")
            self.log.info(self.mysql_preoperator)
            mysql.run(self.mysql_preoperator)

        self.log.info("Inserting rows into MySQL")
        mysql.insert_rows(table=self.mysql_table, rows=results)