selectgeometry.js

/* Copyright (c) 2019, 2023, Oracle and/or its affiliates. */

/******************************************************************************
 *
 * This software is dual-licensed to you under the Universal Permissive License
 * (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
 * 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
 * either license.
 *
 * If you elect to accept the software under the Apache License, Version 2.0,
 * the following applies:
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * NAME
 *   selectgeometry.js
 *
 * DESCRIPTION
 *   Insert and query Oracle Spatial geometries.
 *
 *****************************************************************************/

'use strict';

Error.stackTraceLimit = 50;

const oracledb = require('oracledb');
const dbConfig = require('./dbconfig.js');

// This example runs in both node-oracledb Thin and Thick modes.
//
// Optionally run in node-oracledb Thick mode
if (process.env.NODE_ORACLEDB_DRIVER_MODE === 'thick') {

  // Thick mode requires Oracle Client or Oracle Instant Client libraries.
  // On Windows and macOS Intel you can specify the directory containing the
  // libraries at runtime or before Node.js starts.  On other platforms (where
  // Oracle libraries are available) the system library search path must always
  // include the Oracle library path before Node.js starts.  If the search path
  // is not correct, you will get a DPI-1047 error.  See the node-oracledb
  // installation documentation.
  let clientOpts = {};
  // On Windows and macOS Intel platforms, set the environment
  // variable NODE_ORACLEDB_CLIENT_LIB_DIR to the Oracle Client library path
  if (process.platform === 'win32' || (process.platform === 'darwin' && process.arch === 'x64')) {
    clientOpts = { libDir: process.env.NODE_ORACLEDB_CLIENT_LIB_DIR };
  }
  oracledb.initOracleClient(clientOpts);  // enable node-oracledb Thick mode
}

console.log(oracledb.thin ? 'Running in thin mode' : 'Running in thick mode');

// If each object's attributes are accessed multiple times, it may be more
// efficient to fetch as simple JavaScriptobjects.
// oracledb.dbObjectAsPojo = true;

async function run() {

  let connection, result;

  try {

    connection = await oracledb.getConnection(dbConfig);

    //
    // Setup
    //
    const stmts = [
      `DROP TABLE no_geometry`,

      `CREATE TABLE no_geometry (id NUMBER, geometry MDSYS.SDO_GEOMETRY)`
    ];

    for (const s of stmts) {
      try {
        await connection.execute(s);
      } catch (e) {
        if (e.errorNum != 942)
          console.error(e);
      }
    }

    //
    // Get a prototype object for the database SDO_GEOMETRY type.
    //
    // getDbObjectClass() can require a round-trip so minimize calls
    // to it.  Pass a fully qualified type name when possible.
    // Only the top-level type needs to be acquired.
    //
    const GeomType = await connection.getDbObjectClass('MDSYS.SDO_GEOMETRY');
    // console.log(GeomType.prototype); // show attributes available

    //
    // Insert Method 1: pass a JavaScript object to the constructor.
    //
    // The JavaScript attributes match the Oracle type attributes.
    // These particular Oracle object attribute names were created
    // case insensitively (the default when quotes weren't used) but
    // need to uppercase in node-oracledb.
    //
    //
    const geometry1 = new GeomType(
      {
        SDO_GTYPE: 2003,
        SDO_SRID: null,
        SDO_POINT: null,
        SDO_ELEM_INFO: [ 1, 1003, 3 ],
        SDO_ORDINATES: [ 1, 2, 5, 8 ]
      }
    );

    await connection.execute(
      `INSERT INTO no_geometry (id, geometry) VALUES (:id, :g)`,
      {id: 1, g: geometry1}
    );

    //
    // Insert Method 2: use the Oracle type name and bind the JavaScript object directly.
    // Use a fully qualified type name when possible.
    //

    await connection.execute(
      `INSERT INTO no_geometry (id, geometry) VALUES (:id, :g)`,
      { id: 2,
        g: {
          type: 'MDSYS.SDO_GEOMETRY',   // the name of the top-level database type, case sensitive
          val: {                        // a JavaScript object that maps to the DB object
            SDO_GTYPE: 2003,
            SDO_SRID: null,
            SDO_POINT: null,
            SDO_ELEM_INFO: [ 1, 1003, 3 ],
            SDO_ORDINATES: [ 4, 8, 5, 9 ]
          }
        }
      }
    );

    //
    // Fetch the objects back
    //

    result = await connection.execute(
      `SELECT id, geometry FROM no_geometry`,
      [],
      // outFormat determines whether rows will be in arrays or JavaScript objects.
      // It does not affect how the GEOMETRY column itself is represented.
      { outFormat: oracledb.OUT_FORMAT_OBJECT }
    );

    for (const row of result.rows) {
      console.log('Object id', row.ID);
      const g = row.GEOMETRY;                         // a DbObject for the named Oracle type
      console.log('Geometry is', g);                  // the whole object
      console.log('Ordinates are', g.SDO_ORDINATES);  // can access attributes
      console.log('JSON', JSON.stringify(g));         // Objects can be stringified
    }

  } catch (err) {
    console.error(err);
  } finally {
    if (connection) {
      try {
        await connection.close();
      } catch (err) {
        console.error(err);
      }
    }
  }
}

run();