93 lines
2.1 KiB
JavaScript
93 lines
2.1 KiB
JavaScript
var EventEmitter = require('events').EventEmitter;
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var util = require('util');
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var types = require(__dirname + "/../types");
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//event emitter proxy
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var NativeQuery = function(text, values, callback) {
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//TODO there are better ways to detect overloads
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if(typeof text == 'object') {
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this.text = text.text;
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this.values = text.values;
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this.name = text.name;
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if(typeof values === 'function') {
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this.callback = values;
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} else if(values) {
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this.values = values;
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this.callback = callback;
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}
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} else {
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this.text = text;
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this.values = values;
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this.callback = callback;
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if(typeof values == 'function') {
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this.values = null;
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this.callback = values;
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}
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}
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if(this.callback) {
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this.rows = [];
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}
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//normalize values
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if(this.values) {
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for(var i = 0, len = this.values.length; i < len; i++) {
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var item = this.values[i];
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switch(typeof item) {
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case 'undefined':
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this.values[i] = null;
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break;
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case 'object':
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this.values[i] = item === null ? null : JSON.stringify(item);
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break;
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case 'string':
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//value already string
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break;
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default:
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//numbers
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this.values[i] = item.toString();
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}
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}
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}
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EventEmitter.call(this);
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};
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util.inherits(NativeQuery, EventEmitter);
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var p = NativeQuery.prototype;
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//maps from native rowdata into api compatible row object
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var mapRowData = function(row) {
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var result = {};
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for(var i = 0, len = row.length; i < len; i++) {
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var item = row[i];
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result[item.name] = item.value == null ? null : types.getTypeParser(item.type, 'text')(item.value);
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}
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return result;
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}
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p.handleRow = function(rowData) {
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var row = mapRowData(rowData);
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if(this.callback) {
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this.rows.push(row);
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}
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this.emit('row', row);
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};
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p.handleError = function(error) {
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if(this.callback) {
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this.callback(error);
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this.callback = null;
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} else {
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this.emit('error', error);
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}
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}
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p.handleReadyForQuery = function() {
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if(this.callback) {
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this.callback(null, { rows: this.rows });
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}
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this.emit('end');
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};
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module.exports = NativeQuery;
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