kysely-mapper/dist/esm/queries/select-query.js

Flexible Kysely-based utility for mapping between tables and objects

var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
import { CompilingMappingSelectQuery } from './compiling-select-query.js';
/**
 * Mapping query for selecting rows from a database table.
 */
export class MappingSelectQuery {
    constructor(db, qb, transforms) {
        this.db = db;
        this.qb = qb;
        this.transforms = transforms;
    }
    /**
     * Returns a compiling query that can be executed multiple times with
     * different parameters (if any parameters were provided), but which only
     * compiles the underlying Kysely query builder on the first execution.
     * Frees the query builder on the first execution to reduce memory usage.
     * @typeParam Parameters Record characterizing the parameter names and
     *  types that were previously embedded in the query, if any.
     * @returns A compiling select query.
     */
    compile() {
        return new CompilingMappingSelectQuery(this.db, this.qb, this.transforms);
    }
    /**
     * Modifies the underlying Kysely query builder. All columns given in
     * `SelectedColumns` are already selected, but you can select additional
     * columns or add column aliases.
     * @param factory A function that takes the current query builder and
     *  returns a new query builder.
     */
    modify(factory) {
        return new MappingSelectQuery(this.db, factory(this.qb), this.transforms);
    }
    /**
     * Retrieves zero or more rows from the table, using `selectTransform`
     * (if provided) to map the rows to objects of type `SelectedObject`.
     * @returns An array of objects for the selected rows, possibly empty.
     */
    returnAll() {
        return __awaiter(this, void 0, void 0, function* () {
            const results = yield this.qb.execute();
            return this.transforms.selectTransform === undefined
                ? results
                : results.map(this.transforms.selectTransform);
        });
    }
    /**
     * Retrieves a single row from the table, using `selectTransform`
     * (if provided) to map the row to an object of type `SelectedObject`.
     * @returns An object for the selected rows, or null if not found.
     */
    returnOne() {
        return __awaiter(this, void 0, void 0, function* () {
            const result = yield this.qb.executeTakeFirst();
            if (!result)
                return null;
            return this.transforms.selectTransform === undefined
                ? result
                : this.transforms.selectTransform(result);
        });
    }
}
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