jupyter/notebook/pyspark-postgres.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Connecting to Postgres\n",
    "This notebook shows how to pass JDBC driver and connect to our Postgres"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import findspark\n",
    "\n",
    "findspark.add_jars('/app/postgresql-42.1.4.jar')\n",
    "findspark.init()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "from pyspark.sql import SparkSession\n",
    "\n",
    "spark = SparkSession.builder.appName(\"pyspark-postgres\").getOrCreate()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [],
   "source": [
    "df = spark.read \\\n",
    "    .format(\"jdbc\") \\\n",
    "    .option(\"url\", \"jdbc:postgresql://postgres/workshop\") \\\n",
    "    .option(\"dbtable\", \"workshop.stocks\") \\\n",
    "    .option(\"user\", \"workshop\") \\\n",
    "    .option(\"password\", \"w0rkzh0p\") \\\n",
    "    .option(\"driver\", \"org.postgresql.Driver\") \\\n",
    "    .load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "root\n",
      " |-- full_date: timestamp (nullable = true)\n",
      " |-- symbol: string (nullable = true)\n",
      " |-- category: string (nullable = true)\n",
      " |-- open: double (nullable = true)\n",
      " |-- high: double (nullable = true)\n",
      " |-- low: double (nullable = true)\n",
      " |-- close: double (nullable = true)\n",
      " |-- ma20: double (nullable = true)\n",
      " |-- ma50: double (nullable = true)\n",
      " |-- ma100: double (nullable = true)\n",
      "\n"
     ]
    }
   ],
   "source": [
    "df.printSchema()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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   "file_extension": ".py",
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