h2o.import_sql_select: Import SQL table that is result of SELECT SQL query into H2O

In h2o: R Interface for the 'H2O' Scalable Machine Learning Platform

Import SQL table that is result of SELECT SQL query into H2O

Description

Creates a temporary SQL table from the specified sql_query. Runs multiple SELECT SQL queries on the temporary table concurrently for parallel ingestion, then drops the table. Be sure to start the h2o.jar in the terminal with your downloaded JDBC driver in the classpath: 'java -cp <path_to_h2o_jar>:<path_to_jdbc_driver_jar> water.H2OApp' Also see h2o.import_sql_table. Currently supported SQL databases are MySQL, PostgreSQL, MariaDB, Hive, Oracle and Microsoft SQL Server.

Usage

h2o.import_sql_select(
  connection_url,
  select_query,
  username,
  password,
  use_temp_table = NULL,
  temp_table_name = NULL,
  optimize = NULL,
  fetch_mode = NULL
)

Arguments

connection_url	URL of the SQL database connection as specified by the Java Database Connectivity (JDBC) Driver. For example, "jdbc:mysql://localhost:3306/menagerie?&useSSL=false"
select_query	SQL query starting with 'SELECT' that returns rows from one or more database tables.
username	Username for SQL server
password	Password for SQL server
use_temp_table	Whether a temporary table should be created from select_query
temp_table_name	Name of temporary table to be created from select_query
optimize	(Optional) Optimize import of SQL table for faster imports. Experimental. Default is true.
fetch_mode	(Optional) Set to DISTRIBUTED to enable distributed import. Set to SINGLE to force a sequential read from the database Can be used for databases that do not support OFFSET-like clauses in SQL statements.

Details

For example, my_sql_conn_url <- "jdbc:mysql://172.16.2.178:3306/ingestSQL?&useSSL=false" select_query <- "SELECT bikeid from citibike20k" username <- "root" password <- "abc123" my_citibike_data <- h2o.import_sql_select(my_sql_conn_url, select_query, username, password)

h2o documentation built on May 29, 2024, 4:26 a.m.