access-db/lib/fastdb/count.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 findTrans_1 = __importDefault(require("../utils/findTrans"));
const fs = require('fs');
const POSITION_STEP = 9;
function fetchCount(table, params = {}) {
    const filePath = (0, pathTo_1.pathTo)(table);
    let oldBuf, num = 0;
    if (!fs.existsSync(filePath)) {
        return { data: num };
        // throw new Error(FASTDB_FILE_ERROR)
    }
    oldBuf = fs.readFileSync(filePath);
    let t_positon = POSITION_STEP, t_json, n = 0;
    while (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) {
            num++;
        }
        t_positon = end + POSITION_STEP;
    }
    return { data: num };
}
exports.default = fetchCount;