h2o.import_sql_table: Import SQL Table into H2O

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

Import SQL Table into H2O

Description

Imports SQL table into an H2O cluster. Assumes that the SQL table is not being updated and is stable. Runs multiple SELECT SQL queries concurrently for parallel ingestion. 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_select. Currently supported SQL databases are MySQL, PostgreSQL, MariaDB, Hive, Oracle and Microsoft SQL Server.

Usage

h2o.import_sql_table(
  connection_url,
  table,
  username,
  password,
  columns = 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"
table	Name of SQL table
username	Username for SQL server
password	Password for SQL server
columns	(Optional) Character vector of column names to import from SQL table. Default is to import all columns.
optimize	(Optional) Optimize import of SQL table for faster imports. Default is true. Ignored - use fetch_mode instead.
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" table <- "citibike20k" username <- "root" password <- "abc123" my_citibike_data <- h2o.import_sql_table(my_sql_conn_url, table, username, password)

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