Trying to connect to Oracle from Spark

问题

I am trying to connect to Oracle to Spark and want pull data from some table and SQL queries. But I am not able to connect to Oracle. I have tried different work around options, but no look. I have followed the below steps. Please correct me if I need to make any changes.

I am using Windows 7 machine. I using Jupyter notebook to use Pyspark. I have python 2.7 and Spark 2.1.0. I have set a spark Class path in environment variables:

  SPARK_CLASS_PATH = C:\Oracle\Product\11.2.0\client_1\jdbc\lib\ojdbc6.jar

jdbcDF = sqlContext.read.format("jdbc").option("driver", "oracle.jdbc.driver.OracleDriver").option("url", "jdbc:oracle://dbserver:port#/database").option("dbtable","Table_name").option("user","username").option("password","password").load()

Errors:

1.Py4JJavaError:

An error occurred while calling o148.load.
: java.sql.SQLException: Invalid Oracle URL specified

2.Py4JJavaError:

An error occurred while calling o114.load. : java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver

Another Scenario:

  from pyspark import SparkContext, SparkConf
    from pyspark.sql import SQLContext
    ORACLE_DRIVER_PATH = "C:\Oracle\Product\11.2.0\client_1\jdbc\lib\ojdbc7.jar"                                            
    Oracle_CONNECTION_URL ="jdbc:oracle:thin:username/password@servername:port#/dbservicename"    
   conf = SparkConf()
   conf.setMaster("local")
   conf.setAppName("Oracle_imp_exp")       
   sqlContext = SQLContext(sc)
   ora_tmp=sqlContext.read.format('jdbc').options(
        url=Oracle_CONNECTION_URL,
        dbtable="tablename",
        driver="oracle.jdbc.OracleDriver"
        ).load()

I am getting below error.

Error: IllegalArgumentException: u"Error while instantiating org.apache.spark.sql.hive.HiveSessionState':"

Please help me on this.

回答1:

This one got worked out with this change.

   sqlContext = SQLContext(sc)
   ora_tmp=spark.read.format('jdbc').options(
        url=Oracle_CONNECTION_URL,
        dbtable="tablename",
        driver="oracle.jdbc.OracleDriver"
        ).load()

回答2:

I have followed below code and it work for me. Import jdbc drive(ojdbc6).

    import org.apache.spark.sql.SparkSession

    object ConnectingOracleDatabase {
      def main(args: Array[String]): Unit = {
        val spark = SparkSession.builder()
          .appName("ConnectingOracleDatabase")
          .master("local")
          .getOrCreate()

    val jdbcDF = spark.read
      .format("jdbc")
      .option("url", "jdbc:oracle:thin:@localhost:1521:xe")
      .option("dbtable", "ADDRESS")
      .option("user", "system")
      .option("password", "oracle")
      .option("driver", "oracle.jdbc.OracleDriver")
      .load()

    jdbcDF.show()

  }
}

来源：https://stackoverflow.com/questions/42768697/trying-to-connect-to-oracle-from-spark

标签

apache-spark-sql

pyspark-sql

oracleclient