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‎javascript/nashorn/ReadMe-JavaScript-OJVM.rtf‎

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‎javascript/nashorn/hello.js‎

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function hello()
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{
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/*
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*This is a sample Javascript file that prints "Hello World".
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*/
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var hellow = "Hello World";
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return hellow;
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}
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var output = hello();
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print(output);

‎javascript/nashorn/hello.sql‎

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REM
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REM Script for running hello.js in the database
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REM
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SQL>set serveroutput on
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SQL>call dbms_java.set_output(20000);
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SQL>call dbms_javascript.run("hello.js");
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‎javascript/nashorn/select.js‎

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var selectQuery = function(id)
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{
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var Driver = Packages.oracle.jdbc.OracleDriver;
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var oracleDriver = new Driver();
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var url = "jdbc:default:connection:";
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var query = "";
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var output = "";
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if(id == 'all') {
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query ="SELECT a.data FROM employees a";
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} else {
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query ="SELECT a.data FROM employees a WHERE a.data.EmpId=" + id;
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}
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var connection = oracleDriver.defaultConnection();
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// Prepare statement
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var preparedStatement = connection.prepareStatement(query);
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// execute Query
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var resultSet = preparedStatement.executeQuery();
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// display results
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while(resultSet.next()) {
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output = output + resultSet.getString(1) + " ";
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}
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// cleanup
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resultSet.close();
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preparedStatement.close();
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connection.close();
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return output;
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}

‎javascript/nashorn/selectJS-javax-wrapper.sql‎

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REM
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REM Running JavaScript using Javax API in OJVM
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REM
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REM -------------------------------------------------------------
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REM Copyright (c) 2017, Oracle and/or its affiliates. All rights
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REM reserved.
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REM
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REM Author Kuassi Mensah
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REM
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REM Turn steps i, ii and iii in ReadeMe-JavaScript-OJVM.txt into a Java
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REM wrapper class in OJVM.
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REM
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REM This description is based on select.js
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REM For your own JavaScript function, the signature may differ depending
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REM on your input parameters and return values.
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REM
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REM The following script generates the Java wrapper class;
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REM you may paste this direcly in a SQL session
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REM or put it in a script file and invoke it.
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REM
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create or replace and compile java resource named "InvokeScript" as
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import javax.script.*;
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import java.net.*;
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import java.io.*;
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public class InvokeScript {
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public static String eval(String inputId) throws Exception {
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String output = new String();
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try {
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// create a script engine manager
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ScriptEngineManager factory = new ScriptEngineManager();
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// create a JavaScript engine
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ScriptEngine engine = factory.getEngineByName("javascript");
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//read the script as a java resource
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engine.eval(new InputStreamReader
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(InvokeScript.class.getResourceAsStream("select.js")));
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/*
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* Alternative approach
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* engine.eval(Thread.currentThread().getContextClassLoader().getResource("select.js"));
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*/
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Invocable invocable = (Invocable) engine;
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Object selectResult =
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invocable.invokeFunction("selectQuery", inputId);
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output = selectResult.toString();
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} catch(Exception e) {
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output =e.getMessage();
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}
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return output;
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}
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}
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/
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REM Create a SQL wrapper for the eval function
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REM Create function
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REM
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CREATE OR REPLACE FUNCTION invokeScriptEval(inputId varchar2) return varchar2 as language java
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name 'InvokeScript.eval(java.lang.String) return java.lang.String';
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/
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REM
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REM Allow calling InvokeScriptEval() from SQL or PL/SQL
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REM
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CREATE OR REPLACE PROCEDURE sqldemo(id IN varchar2)
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IS
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output varchar2(10000);
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BEGIN
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SELECT invokeScriptEval(id) INTO output from dual;
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dbms_output.put_line(output);
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END;
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/
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SHOW ERRORS;

‎javascript/nashorn/selectJS-table.sql‎

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REM
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REM Create the EMPLOYEES table of JSON documents
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REM
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DROP TABLE employees PURGE;
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CREATE TABLE employees (
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id RAW(16) NOT NULL,
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data CLOB,
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CONSTRAINT employees_pk PRIMARY KEY (id),
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CONSTRAINT employees_json_chk CHECK (data IS JSON)
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);
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TRUNCATE TABLE employees;
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INSERT INTO employees (id, data)
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VALUES (SYS_GUID(),
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'{
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"EmpId" : "100",
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"FirstName" : "Kuassi",
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"LastName" : "Mensah",
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"Job" : "Manager",
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"Email" : "kuassi@oracle.com",
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"Address" : {
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"City" : "Redwood",
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"Country" : "US"
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}
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}');
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INSERT INTO employees (id, data)
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VALUES (SYS_GUID(),
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'{
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"EmpId" : "200",
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"FirstName" : "Nancy",
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"LastName" : "Greenberg",
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"Job" : "Manager",
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"Email" : "Nancy@oracle.com",
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"Address" : {
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"City" : "Boston",
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"Country" : "US"
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}
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}');
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INSERT INTO employees (id, data)
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VALUES (SYS_GUID(),
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'{
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"EmpId" : "300",
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"FirstName" : "Suresh",
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"LastName" : "Mohan",
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"Job" : "Developer",
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"Email" : "Suresh@oracle.com",
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"Address" : {
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"City" : "Bangalore",
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"Country" : "India"
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}
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}');
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INSERT INTO employees (id, data)
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VALUES (SYS_GUID(),
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'{
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"EmpId" : "400",
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"FirstName" : "Nirmala",
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"LastName" : "Sundarappa",
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"Job" : "Manager",
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"Email" : "Nirmala@oracle.com",
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"Address" : {
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"City" : "Redwood",
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"Country" : "US"
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}
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}');
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INSERT INTO employees (id, data)
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VALUES (SYS_GUID(),
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'{
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"EmpId" : "500",
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"FirstName" : "Amarnath",
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"LastName" : "Chandana",
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"Job" : "Test Devloper",
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"Email" : "amarnath@oracle.com",
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"Address" : {
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"City" : "Bangalore",
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"Country" : "India"
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}
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}');
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COMMIT;
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‎javascript/nashorn/selectJS.sql‎

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REM
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REM Calling SelectQuery (in select.js) using the Javax APi and wrappers (see Javax-wrapper.sql)
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REM thru SQLDEMO procedure
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REM
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set serveroutput on
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call dbms_java.set_output(5000);
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call sqldemo('100');
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REM You may use different parameter values.

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