Category: Uncategorized

Oracle JDBC

This post is how to connect to oracle from JDBC.

There are four main connection examples:

TCP to Single Host
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=<HOST>)(PORT=<PORT>))(CONNECT_DATA=(SERVICE_NAME=<SERVICE_NAME>)))
TCP to Multiple Hosts
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=<HOST1>)(PORT=<PORT1>))(ADDRESS=(PROTOCOL=TCP)(HOST=<HOST2>)(PORT=<PORT2>))(CONNECT_DATA=(SERVICE_NAME=<SERVICE_NAME>)))
SSL to Single Host
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCPS)(HOST=<HOST>)(PORT=<PORT>))(CONNECT_DATA=(SERVICE_NAME=<SERVICE_NAME>)))
SSL to Multiple Hosts
jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCPS)(HOST=<HOST1>)(PORT=<PORT1>))(ADDRESS=(PROTOCOL=TCPS)(HOST=<HOST2>)(PORT=<PORT2>))(CONNECT_DATA=(SERVICE_NAME=<SERVICE_NAME>)))
Connect Using PySpark With Databricks

You will need to get the secret from a keyvault. Refer to Databricks: Get Secret

secret = <Get_Secret>

df = spark.read \
    .format("jdbc") \
    .option("url", "<URL>") \
    .option("dbtable", "<SCHEMA>.<TABLE>") \
    .option("user", "<ACCOUNT>") \
    .option("password", secret) \
    .option("driver", "oracle.jdbc.driver.OracleDriver") \
    .laod()
Connect Using SQL With Databricks

It should be noted that this isn’t a really good way and I don’t believe is completely secure.

Add cluster configuration

spark.databricks.secureVariableSubstitute.enabled false
spark.<SOME_VARIABLE_NAME> {{secrets/<SCOPE>/<SECRET>}}

Code

%sql

CREATE SCHEMA IF NOT EXISTS <SCHEMA_NAME>;

DROP VIEW IF EXISTS <VIEW_NAME>;

CREATE TEMPORARY VIEW <SCHEMA_NAME>.<VIEW_NAME>
USING org.apache.spark.sql.jdbc
OPTIONS (
   url "<URL>",
   dbtable "<SCHEMA_NAME>.<TABLE_NAME>",
   user "<ACCOUNT>",
   password "${spark.<SOME_VARIABLE_NAME>}",
   driver "oracle.jdbc.driver.OracleDriver"
)