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65 lines
1.3 KiB
JavaScript
65 lines
1.3 KiB
JavaScript
'use strict';
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/*jslint node:true, nomen: true*/
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var inherits = require('util').inherits;
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var Readable = require('stream').Readable;
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var _ = require('lodash');
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function OracleQueryStream(connection, sql, bindings, options) {
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try {
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Readable.call(this, _.merge({}, {
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objectMode: true,
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highWaterMark: 1000
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}, options));
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this.oracleReader = connection.reader(sql, bindings || []);
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} catch (err) {
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throw err;
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}
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}
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inherits(OracleQueryStream, Readable);
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OracleQueryStream.prototype._read = function() {
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var self = this;
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function pushNull() {
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process.nextTick(function() {
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self.push(null);
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});
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}
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try {
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this.oracleReader.nextRows(function(err, rows) {
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if (err) {
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return self.emit('error', err);
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}
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if (rows.length === 0) {
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pushNull();
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} else {
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for (var i = 0; i < rows.length; i++) {
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if (rows[i]) {
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self.push(rows[i]);
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} else {
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pushNull();
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}
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}
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}
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});
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} catch (e) {
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// Catch Error: invalid state: reader is busy with another nextRows call
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// and return false to rate limit stream.
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if (e.message ===
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'invalid state: reader is busy with another nextRows call') {
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return false;
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} else {
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this.emit('error', e);
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}
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}
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};
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module.exports = OracleQueryStream;
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