318 lines
10 KiB
TypeScript
318 lines
10 KiB
TypeScript
import {query, QueryResult} from "./MysqlConnectionManager";
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import {Connection} from "mysql";
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import Model from "./Model";
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import Pagination from "../Pagination";
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import ModelRelation from "./ModelRelation";
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import ModelFactory from "./ModelFactory";
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export default class ModelQuery<M extends Model> {
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public static select<M extends Model>(factory: ModelFactory<M>, ...fields: string[]): ModelQuery<M> {
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return new ModelQuery(QueryType.SELECT, factory, fields.length > 0 ? fields : ['*']);
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}
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public static update<M extends Model>(factory: ModelFactory<M>, data: {
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[key: string]: any
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}): ModelQuery<M> {
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const fields = [];
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for (let key in data) {
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if (data.hasOwnProperty(key)) {
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fields.push(new UpdateFieldValue(key, data[key], false));
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}
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}
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return new ModelQuery(QueryType.UPDATE, factory, fields);
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}
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public static delete<M extends Model>(factory: ModelFactory<M>): ModelQuery<M> {
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return new ModelQuery(QueryType.DELETE, factory);
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}
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private readonly type: QueryType;
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private readonly factory: ModelFactory<M>;
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private readonly table: string;
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private readonly fields: (string | SelectFieldValue | UpdateFieldValue)[];
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private _leftJoin?: string;
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private _leftJoinOn: WhereFieldValue[] = [];
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private _where: WhereFieldValue[] = [];
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private _limit?: number;
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private _offset?: number;
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private _sortBy?: string;
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private _sortDirection?: 'ASC' | 'DESC';
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private readonly relations: string[] = [];
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private _pivot?: string[];
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private constructor(type: QueryType, factory: ModelFactory<M>, fields?: (string | SelectFieldValue | UpdateFieldValue)[]) {
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this.type = type;
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this.factory = factory;
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this.table = factory.table;
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this.fields = fields || [];
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}
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public leftJoin(table: string): this {
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this._leftJoin = table;
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return this;
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}
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public on(field1: string, field2: string, test: WhereTest = WhereTest.EQ, operator: WhereOperator = WhereOperator.AND): this {
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this._leftJoinOn.push(new WhereFieldValue(field1, field2, true, test, operator));
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return this;
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}
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public where(field: string, value: string | Date | ModelQuery<any> | any, test: WhereTest = WhereTest.EQ, operator: WhereOperator = WhereOperator.AND): this {
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this._where.push(new WhereFieldValue(field, value, false, test, operator));
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return this;
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}
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public limit(limit: number, offset: number = 0): this {
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this._limit = limit;
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this._offset = offset;
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return this;
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}
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public sortBy(field: string, direction: 'ASC' | 'DESC' = 'ASC'): this {
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this._sortBy = field;
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this._sortDirection = direction;
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return this;
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}
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/**
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* @param relation The relation field name to eagerload
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*/
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public with(relation: string): this {
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this.relations.push(relation);
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return this;
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}
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public pivot(...fields: string[]): this {
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this._pivot = fields;
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return this;
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}
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public toString(final: boolean = false): string {
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let query = '';
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if (this._pivot) this.fields.push(...this._pivot);
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let fields = this.fields.join(',');
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let join = '';
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if (this._leftJoin) {
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join = `LEFT JOIN ${this._leftJoin} ON ${this._leftJoinOn[0]}`;
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for (let i = 1; i < this._leftJoinOn.length; i++) {
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join += this._leftJoinOn[i].toString(false);
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}
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}
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let where = '';
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if (this._where.length > 0) {
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where = `WHERE ${this._where[0]}`;
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for (let i = 1; i < this._where.length; i++) {
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where += this._where[i].toString(false);
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}
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}
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let limit = '';
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if (typeof this._limit === 'number') {
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limit = `LIMIT ${this._limit}`;
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if (typeof this._offset === 'number' && this._offset !== 0) {
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limit += ` OFFSET ${this._offset}`;
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}
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}
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let orderBy = '';
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if (typeof this._sortBy === 'string') {
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orderBy = `ORDER BY ${this._sortBy} ${this._sortDirection}`;
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}
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switch (this.type) {
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case QueryType.SELECT:
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query = `SELECT ${fields} FROM ${this.table} ${join} ${where} ${orderBy} ${limit}`;
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break;
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case QueryType.UPDATE:
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query = `UPDATE ${this.table} SET ${fields} ${where} ${orderBy} ${limit}`;
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break;
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case QueryType.DELETE:
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query = `DELETE FROM ${this.table} ${where} ${orderBy} ${limit}`;
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break;
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}
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return final ? query : `(${query})`;
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}
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public build(): string {
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return this.toString(true);
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}
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public get variables(): any[] {
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const variables: any[] = [];
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this.fields?.filter(v => v instanceof FieldValue)
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.flatMap(v => (<FieldValue>v).variables)
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.forEach(v => variables.push(v));
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this._where.flatMap(v => v.variables)
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.forEach(v => variables.push(v));
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return variables;
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}
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public async execute(connection?: Connection): Promise<QueryResult> {
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return await query(this.build(), this.variables, connection);
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}
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public async get(connection?: Connection): Promise<ModelQueryResult<M>> {
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const queryResult = await this.execute();
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const models: ModelQueryResult<M> = [];
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if (this._pivot) models.pivot = [];
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// Eager loading init
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const relationMap: { [p: string]: ModelRelation<any, any, any>[] } = {};
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for (const relation of this.relations) {
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relationMap[relation] = [];
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}
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for (const result of queryResult.results) {
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const model = this.factory.create(result);
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models.push(model);
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if (this._pivot) {
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const obj: any = {};
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for (const field of this._pivot) {
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obj[field] = result[field];
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}
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models.pivot!.push(obj);
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}
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// Eager loading init map
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for (const relation of this.relations) {
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if (model[relation] === undefined) throw new Error(`Relation ${relation} doesn't exist on ${model.constructor.name}.`);
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relationMap[relation].push(model[relation]);
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}
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}
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// Eager loading execute
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for (const relationName of this.relations) {
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const relations = relationMap[relationName];
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if (relations.length > 0) {
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const allModels = await relations[0].eagerLoad(relations);
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await Promise.all(relations.map(r => r.populate(allModels)));
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}
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}
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return models;
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}
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public async paginate(page: number, perPage: number, connection?: Connection): Promise<ModelQueryResult<M>> {
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this.limit(perPage, (page - 1) * perPage);
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const result = await this.get(connection);
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result.pagination = new Pagination<M>(result, page, perPage, await this.count(true, connection));
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return result;
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}
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public async first(): Promise<M | null> {
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const models = await this.limit(1).get();
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return models.length > 0 ? models[0] : null;
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}
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public async count(removeLimit: boolean = false, connection?: Connection): Promise<number> {
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if (removeLimit) {
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this._limit = undefined;
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this._offset = undefined;
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}
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this._sortBy = undefined;
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this._sortDirection = undefined;
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this.fields.splice(0, this.fields.length);
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this.fields.push('COUNT(*)');
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let queryResult = await this.execute(connection);
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return queryResult.results.length;
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}
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}
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export interface ModelQueryResult<M extends Model> extends Array<M> {
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pagination?: Pagination<M>;
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pivot?: { [p: string]: any }[];
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}
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export enum QueryType {
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SELECT,
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UPDATE,
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DELETE,
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}
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export enum WhereOperator {
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AND = 'AND',
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OR = 'OR',
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}
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export enum WhereTest {
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EQ = '=',
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NE = '!=',
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GT = '>',
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GE = '>=',
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LT = '<',
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LE = '<=',
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IN = ' IN ',
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}
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class FieldValue {
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protected readonly field: string;
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protected value: any;
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protected raw: boolean;
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constructor(field: string, value: any, raw: boolean) {
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this.field = field;
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this.value = value;
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this.raw = raw;
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}
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public toString(first: boolean = true): string {
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const valueStr = this.raw || this.value === null || this.value instanceof ModelQuery ? this.value :
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(Array.isArray(this.value) ? `(${'?'.repeat(this.value.length).split('').join(',')})` : '?');
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return `${!first ? ',' : ''}${this.field}${this.test}${valueStr}`;
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}
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protected get test(): string {
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return '=';
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}
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public get variables(): any[] {
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if (this.value instanceof ModelQuery) return this.value.variables;
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if (this.raw || this.value === null) return [];
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if (Array.isArray(this.value)) return this.value;
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return [this.value];
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}
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}
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class SelectFieldValue extends FieldValue {
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public toString(first: boolean = true): string {
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return `(${this.value instanceof ModelQuery ? this.value : '?'}) AS ${this.field}`;
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}
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}
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class UpdateFieldValue extends FieldValue {
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}
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class WhereFieldValue extends FieldValue {
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private readonly _test: WhereTest;
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private readonly operator: WhereOperator;
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constructor(field: string, value: any, raw: boolean, test: WhereTest, operator: WhereOperator) {
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super(field, value, raw);
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this._test = test;
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this.operator = operator;
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}
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public toString(first: boolean = true): string {
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return (!first ? ` ${this.operator} ` : '') + super.toString(true);
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}
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protected get test(): string {
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if (this.value === null) {
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if (this._test === WhereTest.EQ) {
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return ' IS ';
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} else if (this._test === WhereTest.NE) {
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return ' IS NOT ';
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}
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}
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return this._test;
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}
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} |