kysely-mapper/dist/esm/queries/delete-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 { CompilingMappingDeleteQuery } from './compiling-delete-query.js';
/**
 * Mapping query for deleting rows from a database table.
 */
export class MappingDeleteQuery {
    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 delete query.
     */
    compile() {
        return new CompilingMappingDeleteQuery(this.db, this.qb, this.transforms);
    }
    /**
     * Runs the query, returning the number of rows deleted, converted to
     * the required client representation.
     * @returns Number of rows deleted, in client-requested representation.
     */
    returnCount() {
        return __awaiter(this, void 0, void 0, function* () {
            const result = yield this.qb.executeTakeFirst();
            return this.transforms.countTransform === undefined
                ? result.numDeletedRows
                : this.transforms.countTransform(result.numDeletedRows);
        });
    }
    /**
     * Modifies the underlying Kysely query builder.
     * @param factory A function that takes the current query builder and
     *  returns a new query builder.
     */
    modify(factory) {
        return new MappingDeleteQuery(this.db, factory(this.qb), this.transforms);
    }
    /**
     * Runs the query, deleting the indicated rows, returning nothing.
     * @returns `true` if any rows were deleted, `false` otherwise.
     */
    run() {
        return __awaiter(this, void 0, void 0, function* () {
            const results = yield this.qb.executeTakeFirst();
            return results.numDeletedRows !== BigInt(0);
        });
    }
}
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