470 lines
17 KiB
TypeScript
470 lines
17 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, {RelationDatabaseProperties} from "./ModelRelation";
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import ModelFactory from "./ModelFactory";
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export default class ModelQuery<M extends Model> implements WhereFieldConsumer<M> {
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public static select<M extends Model>(factory: ModelFactory<M>, ...fields: SelectFields): ModelQuery<M> {
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fields = fields.map(v => v === '' ? new SelectFieldValue('none', 1, true) : v);
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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(inputToFieldOrValue(key, factory.table), 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: SelectFields;
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private _leftJoin?: string;
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private _leftJoinAlias?: string;
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private _leftJoinOn: WhereFieldValue[] = [];
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private _where: (WhereFieldValue | WhereFieldValueGroup)[] = [];
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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 readonly subRelations: { [relation: string]: string[] } = {};
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private _pivot?: string[];
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private _union?: ModelQueryUnion;
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private _recursiveRelation?: RelationDatabaseProperties;
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private _reverseRecursiveRelation?: boolean;
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private constructor(type: QueryType, factory: ModelFactory<M>, fields?: SelectFields) {
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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, alias?: string): this {
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this._leftJoin = table;
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this._leftJoinAlias = alias;
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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(inputToFieldOrValue(field1), inputToFieldOrValue(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 groupWhere(setter: (query: WhereFieldConsumer<M>) => void, operator: WhereOperator = WhereOperator.AND): this {
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this._where.push(new WhereFieldValueGroup(this.collectWheres(setter), operator));
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return this;
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}
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private collectWheres(setter: (query: WhereFieldConsumer<M>) => void): (WhereFieldValue | WhereFieldValueGroup)[] {
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const query = this;
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const wheres: (WhereFieldValue | WhereFieldValueGroup)[] = [];
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setter({
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where(field: string, value: string | Date | ModelQuery<any> | any, test: WhereTest = WhereTest.EQ, operator: WhereOperator = WhereOperator.AND) {
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wheres.push(new WhereFieldValue(field, value, false, test, operator));
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return this;
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},
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groupWhere(setter: (query: WhereFieldConsumer<M>) => void, operator: WhereOperator = WhereOperator.AND) {
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wheres.push(new WhereFieldValueGroup(query.collectWheres(setter), operator))
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return this;
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}
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});
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return wheres;
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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: SortDirection = 'ASC', raw: boolean = false): this {
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this._sortBy = raw ? field : inputToFieldOrValue(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 relations The relations field names to eagerload. To load nested relations, separate fields with '.'
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* (i.e.: "author.roles.permissions" loads authors, their roles, and the permissions of these roles)
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*/
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public with(...relations: string[]): this {
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relations.forEach(relation => {
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const parts = relation.split('.');
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if (this.relations.indexOf(parts[0]) < 0) this.relations.push(parts[0]);
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if (parts.length > 1) {
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if (!this.subRelations[parts[0]]) this.subRelations[parts[0]] = [];
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this.subRelations[parts[0]].push(parts.slice(1).join('.'));
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}
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});
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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 union(query: ModelQuery<any>, sortBy: string, direction: SortDirection = 'ASC', raw: boolean = false, limit?: number, offset?: number): this {
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if (this.type !== QueryType.SELECT) throw new Error('Union queries are only implemented with SELECT.');
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this._union = {
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query: query,
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sortBy: raw ? sortBy : inputToFieldOrValue(sortBy),
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direction: direction,
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limit: limit,
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offset: offset,
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};
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return this;
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}
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public recursive(relation: RelationDatabaseProperties, reverse: boolean): this {
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if (this.type !== QueryType.SELECT) throw new Error('Recursive queries are only implemented with SELECT.');
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this._recursiveRelation = relation;
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this._reverseRecursiveRelation = reverse;
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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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// Prevent wildcard and fields from conflicting
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let fields = this.fields.map(f => {
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const field = f.toString();
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if (field.startsWith('(')) return f; // Skip sub-queries
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return inputToFieldOrValue(field, this.table);
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}).join(',');
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let join = '';
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if (this._leftJoin) {
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join = ` LEFT JOIN \`${this._leftJoin}\``
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+ (this._leftJoinAlias ? ` AS \`${this._leftJoinAlias}\`` : '')
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+ ` 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} ${this._sortDirection!}`;
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}
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const table = `\`${this.table}\``;
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switch (this.type) {
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case QueryType.SELECT:
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if (this._recursiveRelation) {
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const cteFields = fields.replace(RegExp(`${table}`, 'g'), 'o');
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const idKey = this._reverseRecursiveRelation ? this._recursiveRelation.foreignKey : this._recursiveRelation.localKey;
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const sortOrder = this._reverseRecursiveRelation ? 'DESC' : 'ASC';
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query = `WITH RECURSIVE cte AS (`
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+ `SELECT ${fields},1 AS __depth, CONCAT(\`${idKey}\`) AS __path FROM ${table}${where}`
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+ ` UNION `
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+ `SELECT ${cteFields},c.__depth + 1,CONCAT(c.__path,'/',o.\`${idKey}\`) AS __path FROM ${table} AS o, cte AS c WHERE o.\`${this._recursiveRelation.foreignKey}\`=c.\`${this._recursiveRelation.localKey}\``
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+ `) SELECT * FROM cte${join}${orderBy || ` ORDER BY __path ${sortOrder}`}${limit}`;
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} else {
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query = `SELECT ${fields} FROM ${table}${join}${where}${orderBy}${limit}`;
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}
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if (this._union) {
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const unionOrderBy = this._union.sortBy ? ` ORDER BY ${this._union.sortBy} ${this._union.direction}` : '';
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const unionLimit = typeof this._union.limit === 'number' ? ` LIMIT ${this._union.limit}` : '';
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const unionOffset = typeof this._union.offset === 'number' ? ` OFFSET ${this._union.offset}` : '';
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query = `(${query}) UNION ${this._union.query.toString(false)}${unionOrderBy}${unionLimit}${unionOffset}`;
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}
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break;
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case QueryType.UPDATE:
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query = `UPDATE ${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 ${table}${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 => this.getVariables(v))
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.forEach(v => variables.push(v));
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this._union?.query.variables.forEach(v => variables.push(v));
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return variables;
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}
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private getVariables(where: WhereFieldValue | WhereFieldValueGroup): any[] {
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return where instanceof WhereFieldValueGroup ?
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where.fields.flatMap(v => this.getVariables(v)) :
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where.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(connection);
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const models: ModelQueryResult<M> = [];
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models.originalData = [];
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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 modelData: any = {};
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for (const field of Object.keys(result)) {
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modelData[field.split('.')[1] || field] = result[field];
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}
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const model = this.factory.create(modelData, false);
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models.push(model);
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models.originalData.push(modelData);
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if (this._pivot) {
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const pivotData: any = {};
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for (const field of this._pivot) {
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pivotData[field] = result[field.split('.')[1]];
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}
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models.pivot!.push(pivotData);
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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, this.subRelations[relationName]);
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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(new SelectFieldValue('_count', 'COUNT(*)', true));
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let queryResult = await this.execute(connection);
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return queryResult.results[0]['_count'];
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}
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}
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function inputToFieldOrValue(input: string, addTable?: string): string {
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if (input.startsWith('`') || input.startsWith('"') || input.startsWith("'")) {
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return input;
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}
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let parts = input.split('.');
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if (addTable && parts.length === 1) parts = [addTable, input]; // Add table disambiguation
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return parts.map(v => v === '*' ? v : `\`${v}\``).join('.');
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}
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export interface ModelQueryResult<M extends Model> extends Array<M> {
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originalData?: any[];
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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) ? `(${'?'.repeat(this.value.length).split('').join(',')})` : '?');
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let field = inputToFieldOrValue(this.field);
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return `${first ? '' : ','}${field}${this.test}${valueStr}`;
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}
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protected get test(): string {
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return '=';
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}
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public get variables(): any[] {
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if (this.value instanceof ModelQuery) return this.value.variables;
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if (this.raw || this.value === null) return [];
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if (Array.isArray(this.value)) return this.value;
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return [this.value];
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}
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}
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export class SelectFieldValue extends FieldValue {
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public toString(first: boolean = true): string {
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return `(${this.value instanceof ModelQuery ? this.value : (this.raw ? 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 ? ` ${this.operator} ` : '') + super.toString(true);
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}
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protected get test(): string {
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if (this.value === null) {
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if (this._test === WhereTest.EQ) {
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return ' IS ';
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} else if (this._test === WhereTest.NE) {
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return ' IS NOT ';
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}
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}
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return this._test;
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}
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}
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class WhereFieldValueGroup {
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public readonly fields: (WhereFieldValue | WhereFieldValueGroup)[];
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public readonly operator: WhereOperator;
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public constructor(fields: (WhereFieldValue | WhereFieldValueGroup)[], operator: WhereOperator) {
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this.fields = fields;
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this.operator = operator;
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}
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public toString(first: boolean = true): string {
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let str = `${first ? '' : ` ${this.operator} `}(`;
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let firstField = true;
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for (const field of this.fields) {
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str += field.toString(firstField);
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firstField = false;
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}
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str += ')';
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return str;
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}
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}
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export interface WhereFieldConsumer<M extends Model> {
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where(field: string, value: string | Date | ModelQuery<any> | any, test?: WhereTest, operator?: WhereOperator): this;
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groupWhere(setter: (query: WhereFieldConsumer<M>) => void, operator?: WhereOperator): this;
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}
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export type SelectFields = (string | SelectFieldValue | UpdateFieldValue)[];
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export type SortDirection = 'ASC' | 'DESC';
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type ModelQueryUnion = {
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query: ModelQuery<any>,
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sortBy: string,
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direction: SortDirection,
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limit?: number,
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offset?: number,
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};
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