access-db/lib/fastdb/find.js

[统一数据库的连接]Unified access to all kinds of databases

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const pathTo_1 = require("../utils/pathTo");
const constants_1 = require("../constants/constants");
const error_1 = require("../constants/error");
const findTrans_1 = __importDefault(require("../utils/findTrans"));
const utils_1 = require("../utils/utils");
const fs = require('fs');
const POSITION_STEP = 9;
function fetchFind(table, params = {}) {
    const filePath = (0, pathTo_1.pathTo)(table);
    let oldBuf, result = [], newarr = [];
    if (!fs.existsSync(filePath)) {
        return { data: { objects: result } };
        // throw new Error(FASTDB_FILE_ERROR)
    }
    oldBuf = fs.readFileSync(filePath);
    let limit = (params.limit || 20);
    let all = limit * (params.page || 1);
    let t_positon = POSITION_STEP, t_json, n = 0;
    if (params.orderBy) {
        if (!(0, utils_1.isArray)(params.orderBy))
            throw new Error(error_1.ORDER_BY_NOT_ARRAY);
        let all_json = JSON.parse(oldBuf.toString());
        if (params.orderBy[0][0] === '-') {
            newarr = (0, utils_1.fastdbSort)(all_json, params.orderBy[0].substr(1), 0);
        }
        else {
            newarr = (0, utils_1.fastdbSort)(all_json, params.orderBy[0], 1);
        }
        let index = 0;
        while (result.length < all && index < newarr.length) {
            t_json = newarr[index];
            let isOk = (0, findTrans_1.default)(params, 1, t_json, constants_1.PLATFORM_NAME.FASTDB);
            if (isOk) {
                result.push(t_json);
            }
            index++;
        }
        result = result.slice(all - limit, all);
    }
    else {
        while (result.length < all && t_positon < oldBuf.length) {
            let start = oldBuf.lastIndexOf(`{"id":`, t_positon);
            let end = oldBuf.indexOf(`,{"id"`, t_positon);
            if (end === -1) {
                end = oldBuf.length - 1;
            }
            if (start > -1) {
                t_json = JSON.parse(oldBuf.slice(start, end).toString());
            }
            let isOk = (0, findTrans_1.default)(params, 1, t_json, constants_1.PLATFORM_NAME.FASTDB);
            if (isOk) {
                result.push(t_json);
            }
            t_positon = end + POSITION_STEP;
        }
        result = result.slice(all - limit, all);
    }
    // let tempAdd: any[] = []
    // if(params.select){
    //   for(let i = 0; i < result.length; i++){
    //     let o = {}
    //     for(let j = 0; j < params.select.length; j++){
    //       if(params.select[j][0] === '-'){
    //         delete result[i][params.select[j].substr(1)]
    //       }else{
    //         o[result[i][params.select[j]]]
    //       }
    //     }
    //   }
    // }
    return { data: { objects: result } };
}
exports.default = fetchFind;