129 lines
2.7 KiB
JavaScript
129 lines
2.7 KiB
JavaScript
import { Result } from './result';
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/**
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* This class stores the database results.
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*/
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export class ResultSet {
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results = null;
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error = null;
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/**
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* Initilizes the resultset object.
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*/
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constructor(results, error) {
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this.results = results;
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this.error = error;
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}
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/**
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* Gets the query error.
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*
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* @return {Db.Err} the error or null if no errors hapened
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*/
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getError() {
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return this.error;
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}
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fetch() {
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if (this.error) {
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throw this.error;
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}
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if (this.results !== null && this.results.length > 0) {
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return this.results.shift();
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}
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return null;
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}
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/**
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* Fetchs the next result from the resultset.
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*
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* @return {Db.Result} the result or %null if error or there are no more results
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*/
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fetchResult() {
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const result = this.fetch();
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if (result !== null) {
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if (result.data instanceof Array) {
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return new Result(result);
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} else {
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return true;
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}
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}
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return null;
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}
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/**
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* Fetchs the first row object from the next resultset.
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*
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* @return {Array} the row if success, %null otherwise
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*/
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fetchObject() {
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const result = this.fetch();
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if (
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result !== null &&
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result.data instanceof Array &&
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result.data.length > 0
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) {
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return result.data[0];
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}
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return null;
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}
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/**
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* Fetchs data from the next resultset.
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*
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* @return {Array} the data
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*/
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fetchData() {
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const result = this.fetch();
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if (result !== null && result.data instanceof Array) {
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return result.data;
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}
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return null;
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}
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/**
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* Fetchs the first row and column value from the next resultset.
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*
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* @return {Object} the value if success, %null otherwise
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*/
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fetchValue() {
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const row = this.fetchRow();
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if (row instanceof Array && row.length > 0) {
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return row[0];
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}
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return null;
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}
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/**
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* Fetchs the first row from the next resultset.
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*
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* @return {Array} the row if success, %null otherwise
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*/
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fetchRow() {
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const result = this.fetch();
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if (
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result !== null &&
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result.data instanceof Array &&
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result.data.length > 0
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) {
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const object = result.data[0];
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const row = new Array(result.columns.length);
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for (let i = 0; i < row.length; i++) {
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row[i] = object[result.columns[i].name];
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}
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return row;
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}
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return null;
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}
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}
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